/* ==========================================================================
   GMOSPhuong - Professional Exam Prep Platform
   Modern High-End Design System & Stylesheet
   ========================================================================== */

/* --- Google Fonts & CSS Custom Properties --- */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@500;600;700;800&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

:root {
  /* Color Palette - Vibrant Emerald & Modern Slate */
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-light: #34d399;
  --primary-subtle: rgba(16, 185, 129, 0.12);
  --primary-glow: rgba(16, 185, 129, 0.35);

  --secondary: #6366f1;
  --secondary-hover: #4f46e5;
  --secondary-subtle: rgba(99, 102, 241, 0.12);

  --accent-amber: #f59e0b;
  --accent-amber-subtle: rgba(245, 158, 11, 0.15);
  --accent-red: #f43f5e;
  --accent-red-subtle: rgba(244, 63, 94, 0.12);
  --accent-blue: #0ea5e9;

  /* Theme: Light Defaults */
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-alt: #f1f5f9;
  --bg-card: #ffffff;
  --border-color: rgba(226, 232, 240, 0.85);
  --border-focus: #10b981;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --text-inverse: #ffffff;

  --nav-bg: rgba(15, 23, 42, 0.85);
  --nav-scrolled: rgba(15, 23, 42, 0.95);
  --nav-border: rgba(255, 255, 255, 0.08);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 40px -8px rgba(15, 23, 42, 0.12);
  --shadow-xl: 0 30px 60px -12px rgba(15, 23, 42, 0.18);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.3);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.45s cubic-bezier(0.16, 1, 0.3, 1);

  /* Typography */
  --font-heading: 'Be Vietnam Pro', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --bg-page: #0b0f19;
  --bg-surface: #111827;
  --bg-surface-elevated: #1a2234;
  --bg-alt: #131b2c;
  --bg-card: #151e31;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #34d399;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --text-inverse: #0f172a;

  --nav-bg: rgba(11, 15, 25, 0.85);
  --nav-scrolled: rgba(11, 15, 25, 0.96);
  --nav-border: rgba(255, 255, 255, 0.06);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -8px rgba(0, 0, 0, 0.55);
  --shadow-xl: 0 30px 60px -12px rgba(0, 0, 0, 0.7);
}

/* --- Global Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100vw;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
}

.container {
  width: 90%;
  max-width: 1240px;
  margin: 0 auto;
}

/* --- Header & Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition-normal);
  padding: 1.25rem 0;
  background: transparent;
}

.site-header.scrolled {
  background: var(--nav-scrolled);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--nav-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-heading);
  letter-spacing: -0.5px;
}

.header-logo-img {
  width: 42px !important;
  height: 42px !important;
  max-width: 42px !important;
  max-height: 42px !important;
  border-radius: var(--radius-sm);
  object-fit: contain;
  flex-shrink: 0;
  display: inline-block;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
  transition: transform var(--transition-normal);
}

.logo-wrapper:hover .header-logo-img {
  transform: rotate(-6deg) scale(1.08);
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary) 0%, #059669 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: white;
  box-shadow: 0 4px 15px var(--primary-glow);
  transition: transform var(--transition-normal);
}

.logo-wrapper:hover .logo-icon {
  transform: rotate(-10deg) scale(1.08);
}

.logo-text span {
  color: var(--primary-light);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.8rem;
}

.nav-item a {
  color: rgba(255, 255, 255, 0.88);
  font-weight: 500;
  font-size: 0.98rem;
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--transition-fast);
}

.nav-item a:hover {
  color: #ffffff;
}

.nav-item a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary-light);
  border-radius: 2px;
  transition: width var(--transition-normal);
}

.nav-item a:hover::after,
.nav-item.active a::after {
  width: 100%;
}

.nav-item a.nav-donate-link {
  color: #fbbf24 !important;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-item a.nav-donate-link:hover {
  color: #fde68a !important;
  transform: scale(1.03);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Control Buttons (Lang, Theme) */
.ctrl-btn {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.ctrl-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  padding: 0;
  justify-content: center;
}

.mobile-menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  font-size: 1.2rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* --- Hero Section --- */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 130px 0 80px;
  color: #ffffff;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.88) 0%, rgba(6, 78, 59, 0.8) 100%),
              url('https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjed17TXdynQGVCTygI3Pp5guep2bNBOYG2sZDN-Zw4FBpK8lXpMb05HQHxUvyBzwdOmPGDVIKFhJkGT2NI5EvA68w4JwD42PmrJJ_B_zokSOqlSIf8i3FxiKmY5TfoOkOqjD-pIsSSi8_Uy4_L8jaN9F3vd0KQo8Q4VS4Jrfcn56Rlc36mlG6t9YdOKKm_/s2752/bia%20%281%29.png') no-repeat center center/cover;
  background-attachment: fixed;
}

.hero-glow-orb {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 1;
}

.orb-1 {
  background: var(--primary);
  top: 10%;
  left: 20%;
  animation: floatOrb 12s ease-in-out infinite alternate;
}

.orb-2 {
  background: var(--secondary);
  bottom: 10%;
  right: 15%;
  animation: floatOrb 14s ease-in-out infinite alternate-reverse;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.15); }
  100% { transform: translate(-30px, 40px) scale(0.95); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 920px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-light);
  margin-bottom: 1.75rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  animation: badgePulse 3s infinite;
}

@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.3); }
  50% { box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); }
}

.hero-logo-img {
  width: 135px;
  max-width: 135px;
  height: auto;
  margin: 0 auto 1.25rem;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.35));
  animation: floatLogo 4s ease-in-out infinite;
}

@keyframes floatLogo {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1.25rem;
  text-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
}

.hero-title .highlight {
  background: linear-gradient(135deg, #34d399 0%, #10b981 50%, #6ee7b7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  position: relative;
}

.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.92);
  max-width: 740px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Button Component Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 1rem 2.2rem;
  border-radius: var(--radius-full);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #059669 100%);
  color: white;
  box-shadow: 0 10px 25px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 35px rgba(16, 185, 129, 0.5);
  background: linear-gradient(135deg, #10b981 0%, #047857 100%);
}

.btn-outline-white {
  background: rgba(255, 255, 255, 0.12);
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  color: white;
  backdrop-filter: blur(10px);
}

.btn-outline-white:hover {
  background: white;
  color: #0f172a;
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

/* Stats Counter Row */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
}

/* --- Section Shared Styles --- */
.section {
  padding: 6.5rem 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-alt);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.8rem;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-subtle);
  color: var(--primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 3.2vw, 2.65rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
}

/* --- Download Section (Dual Layout: Stable & Beta) --- */
.download-card-wrapper {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.download-split-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

/* Column Cards */
.dl-col {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.dl-col-stable {
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.dl-col-stable:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.dl-col-beta {
  background: linear-gradient(160deg, var(--bg-card) 0%, rgba(245, 158, 11, 0.05) 100%);
  border: 1.5px solid rgba(245, 158, 11, 0.35);
  box-shadow: 0 10px 30px rgba(245, 158, 11, 0.08);
}

.dl-col-beta:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 40px rgba(245, 158, 11, 0.18);
  border-color: var(--accent-amber);
}

.dl-col-header {
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.dl-col-stable .dl-col-header {
  background: var(--bg-alt);
  border-left: 6px solid var(--primary);
}

.dl-col-beta .dl-col-header {
  background: var(--accent-amber-subtle);
  border-left: 6px solid var(--accent-amber);
}

.dl-header-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.45rem;
  font-weight: 700;
}

.badge-recommended {
  background: var(--primary-subtle);
  color: var(--primary-hover);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.badge-preview {
  background: var(--accent-amber);
  color: #000000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.dl-col-body {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Stable Version List */
.version-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.version-item {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 4px solid var(--primary);
  transition: all var(--transition-fast);
}

.version-item:hover {
  background: var(--primary-subtle);
  transform: translateX(4px);
}

.version-item.latest {
  border-left: 4px solid #f59e0b;
  background: rgba(245, 158, 11, 0.08);
}

.version-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.version-tag-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.version-size-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-mini-download {
  background: var(--primary);
  color: white !important;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px var(--primary-glow);
  transition: all var(--transition-fast);
}

.btn-mini-download:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--primary-glow);
}

/* Beta Column Features & Expanded Layout */
.beta-expanded-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.75rem;
  align-items: start;
}

.beta-features-panel {
  display: flex;
  flex-direction: column;
}

.beta-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-amber-subtle);
  color: #b45309;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 1rem;
  align-self: flex-start;
}

[data-theme="dark"] .beta-pill {
  color: #fbbf24;
}

.beta-lead-text {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.beta-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 0;
}

.beta-feature-list li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-main);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.beta-feature-list li:hover {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
  transform: translateX(4px);
}

.beta-feature-list li i {
  color: var(--accent-amber);
  font-size: 1.15rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

/* Beta Action Panel & CTA Box */
.beta-action-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  background: rgba(245, 158, 11, 0.03);
  border: 1.5px solid rgba(245, 158, 11, 0.22);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .beta-action-panel {
  background: rgba(245, 158, 11, 0.05);
  border-color: rgba(245, 158, 11, 0.25);
}

.beta-alert-box {
  background: rgba(245, 158, 11, 0.12);
  border-left: 4px solid var(--accent-amber);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--text-main);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.5;
}

.beta-download-cta-box {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.btn-beta-download {
  width: 100%;
  padding: 1.05rem 1.5rem;
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: white !important;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
  transition: all var(--transition-fast);
}

.btn-beta-download:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(245, 158, 11, 0.5);
  background: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
}

.beta-spec-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 0.25rem;
}

.spec-tag {
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.spec-tag:hover {
  color: var(--text-main);
  border-color: var(--accent-amber);
}

.beta-security-guarantee {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 0.25rem;
}

.beta-security-guarantee i {
  color: #10b981;
}

.dl-header-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-latest {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

[data-theme="dark"] .badge-latest {
  color: #fbbf24;
  background: rgba(245, 158, 11, 0.2);
  border-color: rgba(245, 158, 11, 0.4);
}

/* System Requirements & Update Info Box */
.requirements-box {
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.req-header {
  padding: 1.25rem 2rem;
  background: var(--primary-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary-hover);
  font-weight: 700;
  font-size: 1.2rem;
}

.req-content-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem;
}

.req-col h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid;
}

.req-col-v5 h4 { color: #10b981; border-color: #10b981; }
.req-col-beta h4 { color: #f59e0b; border-color: #f59e0b; }
.req-col-sys h4 { color: #0ea5e9; border-color: #0ea5e9; }

.req-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.req-col ul li {
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.req-sys-specs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.spec-item {
  font-size: 0.92rem;
  color: var(--text-muted);
  padding: 6px 10px;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
}

.spec-item strong {
  color: var(--text-main);
}

/* --- App Showcase / Slideshow Section --- */
.showcase-slider-wrapper {
  max-width: 1060px;
  margin: 0 auto;
  position: relative;
}

.macbook-mockup-frame {
  background: #1e293b;
  border-radius: 28px;
  padding: 18px 18px 24px;
  box-shadow: 0 35px 80px -15px rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.15);
  position: relative;
}

.macbook-top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 14px;
  padding-left: 8px;
}

.dot-btn {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.mockup-screen-container {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: #0f172a;
  aspect-ratio: 1366 / 728;
}

.slide-item {
  display: none;
  position: relative;
  width: 100%;
  height: 100%;
}

.slide-item.active {
  display: block;
  animation: slideFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideFadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.slide-item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #0f172a;
  cursor: zoom-in;
}

.slide-caption-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 1rem 1.5rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, transparent 100%);
  color: white;
  font-weight: 500;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Slider Controls */
.slider-arrow-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.slider-arrow-btn:hover {
  background: var(--primary);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 0 20px var(--primary-glow);
}

.slider-arrow-prev { left: -26px; }
.slider-arrow-next { right: -26px; }

.slider-tabs-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.slider-tab-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-tab-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.slider-tab-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 4px 15px var(--primary-glow);
}

/* --- Features Grid Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(16, 185, 129, 0.35);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 68px;
  height: 68px;
  border-radius: var(--radius-lg);
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  margin-bottom: 1.5rem;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(-5deg);
  background: var(--primary);
  color: white;
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* --- Testimonials Section --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
}

.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.quote-stars {
  color: #f59e0b;
  display: flex;
  gap: 4px;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.testimonial-text {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 1.75rem;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 14px;
}

.user-avatar-badge {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, #059669 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.user-meta h4 {
  font-size: 1.05rem;
}

.user-meta p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Team Section --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.75rem 2rem 2.25rem;
  text-align: center;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.team-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent-amber) 100%);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.team-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(16, 185, 129, 0.12), 0 2px 10px rgba(0, 0, 0, 0.05);
  border-color: rgba(16, 185, 129, 0.45);
}

.team-card:hover::before {
  opacity: 1;
}

.team-avatar-wrapper {
  width: 175px;
  height: 175px;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  padding: 5px;
  background: linear-gradient(135deg, #10b981 0%, #34d399 50%, #f59e0b 100%);
  box-shadow: 0 10px 25px rgba(16, 185, 129, 0.25);
  position: relative;
  cursor: pointer;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.35s ease;
}

.team-card:hover .team-avatar-wrapper {
  transform: scale(1.05);
  box-shadow: 0 16px 36px rgba(16, 185, 129, 0.4);
}

.team-avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center center;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  background: #f1f5f9;
  display: block;
  transition: transform 0.35s ease, filter 0.3s ease;
}

.team-avatar-wrapper:hover .team-avatar-img {
  transform: scale(1.03);
  filter: brightness(1.03) contrast(1.02);
}

.avatar-badge {
  position: absolute;
  bottom: 4px;
  right: 6px;
  width: 36px;
  height: 36px;
  background: #ffffff;
  color: #10b981;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.16);
  border: 2.5px solid #ffffff;
  z-index: 2;
  transition: transform 0.3s ease;
}

[data-theme="dark"] .avatar-badge {
  background: #1e293b;
  border-color: #0f172a;
}

.team-card:hover .avatar-badge {
  transform: scale(1.15) rotate(10deg);
}

.team-card h3 {
  font-size: 1.45rem;
  margin-bottom: 0.35rem;
}

.team-role {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.team-bio {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- FAQ Accordion Section --- */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 8px 24px var(--primary-subtle);
}

.faq-header {
  padding: 1.4rem 1.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: 1.08rem;
}

.faq-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  background: var(--primary);
  color: white;
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  background: var(--bg-alt);
  padding: 0 1.8rem;
}

.faq-item.active .faq-body {
  max-height: 300px;
  padding: 1.2rem 1.8rem 1.6rem;
}

.faq-body p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- Call To Action (Course Partner Banner) --- */
.cta-banner {
  background: linear-gradient(135deg, #064e3b 0%, #0f172a 100%);
  border-radius: var(--radius-xl);
  padding: 4rem 3rem;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.4) 0%, transparent 70%);
  pointer-events: none;
}

.cta-text h3 {
  color: white;
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.cta-text p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.05rem;
  max-width: 600px;
}

.cta-action {
  flex-shrink: 0;
}

/* --- Footer --- */
.site-footer {
  background: #090d16;
  color: #94a3b8;
  padding: 5rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3.5rem;
  margin-bottom: 3.5rem;
}

.footer-col h3 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
  position: relative;
  display: inline-block;
  padding-bottom: 8px;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 2px;
}

.footer-about p {
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.footer-social-links {
  display: flex;
  gap: 12px;
}

.social-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-btn:hover {
  background: var(--primary);
  transform: translateY(-3px);
  color: white;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-contact-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #cbd5e1;
}

.footer-contact-list li i {
  color: var(--primary);
  width: 20px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: #94a3b8;
  transition: color var(--transition-fast);
}

.footer-links-list a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.9rem;
}

/* ==========================================================================
   Modals (Download Modal, Donate Modal, Image Lightbox)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
  padding: 1.5rem;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 660px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 3rem;
  position: relative;
  transform: scale(0.92) translateY(20px);
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.active .modal-card {
  transform: scale(1) translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--accent-red-subtle);
  color: var(--accent-red);
  transform: rotate(90deg);
}

.modal-header {
  text-align: center;
  margin-bottom: 2rem;
}

.modal-header-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
}

.icon-emerald {
  background: var(--primary-subtle);
  color: var(--primary);
}

.icon-heart {
  background: var(--accent-red-subtle);
  color: var(--accent-red);
}

.modal-title {
  font-size: 2rem;
  letter-spacing: -0.5px;
}

.modal-body {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-main);
  margin-bottom: 2rem;
}

.modal-alert-box {
  background: var(--primary-subtle);
  border-left: 5px solid var(--primary);
  padding: 1.1rem 1.4rem;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.02rem;
  color: var(--text-main);
}

.modal-info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 1.25rem;
}

.modal-info-list li {
  position: relative;
  padding-left: 28px;
}

.modal-info-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary);
  font-weight: 800;
}

.modal-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-donate-heart {
  background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
  color: white;
  box-shadow: 0 8px 20px rgba(234, 88, 12, 0.35);
}

.btn-donate-heart:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(234, 88, 12, 0.45);
}

/* --- Donate Modal Specifics --- */
.donate-items-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin: 1.8rem 0;
}

.donate-item-card {
  background: var(--bg-alt);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.donate-item-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  background: var(--bg-surface);
  box-shadow: var(--shadow-md);
}

.donate-item-card.active {
  border-color: var(--primary);
  background: var(--primary-subtle);
  box-shadow: 0 8px 25px var(--primary-glow);
}

.donate-item-icon {
  font-size: 2.5rem;
  transition: transform var(--transition-fast);
}

.donate-item-card:hover .donate-item-icon {
  transform: scale(1.15) rotate(-6deg);
}

.donate-item-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.donate-item-price {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-hover);
  background: var(--bg-surface);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.donate-qr-box {
  margin-top: 1.8rem;
  padding-top: 1.8rem;
  border-top: 1px dashed var(--border-color);
  text-align: center;
  animation: slideFadeIn 0.4s ease;
}

.qr-code-img {
  max-width: 220px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 6px solid var(--bg-surface);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast);
}

.qr-code-img:hover {
  transform: scale(1.04);
}

.bank-info-card {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin: 1.25rem auto;
  max-width: 380px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
  border: 1px solid var(--border-color);
}

.bank-copy-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-copy-stk {
  background: var(--primary-subtle);
  color: var(--primary);
  border: none;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.btn-copy-stk:hover {
  background: var(--primary);
  color: white;
}

.bank-select-control {
  width: 100%;
  max-width: 380px;
  margin: 1rem auto;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-main);
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

.bank-select-control:focus {
  border-color: var(--primary);
}

.btn-open-bank {
  background: linear-gradient(135deg, var(--primary) 0%, #059669 100%);
  color: white !important;
  max-width: 380px;
  margin: 0 auto;
  width: 100%;
}

/* Lightbox Modal */
.lightbox-modal {
  background: rgba(0, 0, 0, 0.92);
}

.lightbox-modal img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-md);
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 10001;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: #0f172a;
  color: #ffffff;
  padding: 12px 22px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
  animation: toastIn 0.35s cubic-bezier(0.16, 1, 0.3, 1), toastOut 0.35s ease 2.65s forwards;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(20px); }
}

/* --- Scroll Animations (Reveals) --- */
.reveal {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .req-content-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 960px) {
  .beta-expanded-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 860px) {
  .download-split-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    flex-direction: column;
    text-align: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .slider-arrow-prev { left: 10px; }
  .slider-arrow-next { right: 10px; }
}

@media (max-width: 768px) {
  /* ==========================================================
     1. Text Jump & Scroll Stutter Prevention (Chống chữ nhảy)
     ========================================================== */
  /* Disable translateY translation jumps on mobile so text never leaps or janks */
  .reveal {
    transform: none !important;
    opacity: 0;
    transition: opacity 0.4s ease !important;
    will-change: opacity;
  }

  .reveal.revealed {
    opacity: 1 !important;
    transform: none !important;
  }

  /* Hero elements must be immediately visible without waiting or jumping */
  .hero-section .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  /* ==========================================================
     2. Header & Mobile Navigation Drawer
     ========================================================== */
  .site-header {
    padding: 0.65rem 0 !important;
    background: rgba(11, 15, 25, 0.96) !important;
    backdrop-filter: blur(14px) !important;
    -webkit-backdrop-filter: blur(14px) !important;
    border-bottom: 1px solid var(--nav-border) !important;
  }

  .logo-wrapper {
    font-size: 1.22rem !important;
    gap: 8px !important;
  }

  .header-logo-img {
    width: 36px !important;
    height: 36px !important;
    max-width: 36px !important;
    max-height: 36px !important;
  }

  .mobile-menu-toggle {
    display: flex;
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
    border-radius: var(--radius-sm);
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 82%;
    max-width: 360px;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-surface);
    flex-direction: column;
    justify-content: flex-start;
    padding: 6rem 2rem 2rem;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    padding: 5rem 1.75rem 2rem;
    box-shadow: -10px 0 35px rgba(0, 0, 0, 0.4);
    transition: right var(--transition-smooth);
    z-index: 999;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 1.25rem;
    gap: 1.2rem;
  }

  .nav-item a {
    color: var(--text-main);
    font-size: 1.2rem;
    font-size: 1.05rem;
    padding: 0.5rem 0;
    display: block;
    width: 100%;
  }

  .header-controls {
    margin-top: 2rem;
    width: 100%;
    justify-content: space-between;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
  }

  .ctrl-btn {
    background: var(--bg-alt);
    color: var(--text-main);
    border-color: var(--border-color);
  }

  /* ==========================================================
     3. Hero Section (Clean Layout, No Clutter)
     ========================================================== */
  .hero-section {
    min-height: auto !important;
    padding: 95px 0 45px !important;
    background-attachment: scroll !important; /* Critical: fixed attachment causes heavy jitter on touch devices */
  }

  .hero-glow-orb {
    display: none !important; /* Eliminate GPU strain, scroll stutter and horizontal overflow */
  }

  .hero-badge {
    font-size: 0.76rem !important;
    padding: 6px 14px !important;
    gap: 6px !important;
    max-width: 100% !important;
    white-space: normal !important;
    text-align: center !important;
    line-height: 1.35 !important;
    margin-bottom: 0.85rem !important;
  }

  .hero-title {
    font-size: clamp(1.65rem, 6.8vw, 2.15rem) !important;
    line-height: 1.25 !important;
    margin-bottom: 0.85rem !important;
    word-break: break-word;
  }

  .hero-desc {
    font-size: 0.92rem !important;
    line-height: 1.6 !important;
    margin-bottom: 1.6rem !important;
    padding: 0 0.5rem !important;
  }

  .hero-buttons {
    flex-direction: column !important;
    width: 100% !important;
    max-width: 290px !important;
    margin: 0 auto 1.85rem !important;
    gap: 0.75rem !important;
  }

  .hero-buttons .btn {
    width: 100% !important;
    padding: 0.85rem 1.25rem !important;
    font-size: 0.95rem !important;
    justify-content: center !important;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr) !important;
    padding: 1rem 0.75rem !important;
    gap: 0.85rem 0.5rem !important;
    border-radius: var(--radius-lg) !important;
  }

  .stat-number {
    font-size: 1.45rem !important;
  }

  .stat-label {
    font-size: 0.75rem !important;
  }

  /* ==========================================================
     4. Section Spacing & Common Headers
     ========================================================== */
  .section {
    padding: 3.5rem 0 !important;
  }

  .section-header {
    margin-bottom: 2.25rem !important;
  }

  .section-tag {
    font-size: 0.78rem !important;
    padding: 5px 12px !important;
    margin-bottom: 0.65rem !important;
  }

  .section-title {
    font-size: clamp(1.4rem, 5.5vw, 1.85rem) !important;
    line-height: 1.3 !important;
    margin-bottom: 0.65rem !important;
  }

  .section-subtitle {
    font-size: 0.9rem !important;
    line-height: 1.55 !important;
    padding: 0 0.25rem !important;
  }

  /* ==========================================================
     5. Download Hub & Requirements
     ========================================================== */
  .download-card-wrapper {
    padding: 2rem 1.25rem;
    padding: 1.75rem 1rem !important;
    border-radius: 18px !important;
  }

  .download-split-grid {
    gap: 1.5rem !important;
    margin-bottom: 2rem !important;
  }

  .dl-col-header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 8px !important;
    padding: 1.1rem 1rem !important;
  }

  .dl-header-title {
    font-size: 1.2rem !important;
    flex-wrap: wrap !important;
  }

  .dl-col-body {
    padding: 1.25rem 1rem !important;
  }

  .version-list {
    gap: 10px !important;
  }

  .version-item {
    padding: 10px 12px !important;
    gap: 8px !important;
    flex-wrap: wrap !important;
  }

  .version-meta {
    gap: 8px !important;
    flex-wrap: wrap !important;
  }

  .version-tag-name {
    font-size: 0.92rem !important;
  }

  .version-size-date {
    font-size: 0.78rem !important;
  }

  .btn-mini-download {
    padding: 6px 12px !important;
    font-size: 0.8rem !important;
    white-space: nowrap !important;
  }

  .beta-lead-text {
    font-size: 0.95rem !important;
    margin-bottom: 1rem !important;
  }

  .beta-specs-list {
    gap: 6px !important;
    margin-bottom: 1.25rem !important;
  }

  .spec-tag {
    font-size: 0.75rem !important;
    padding: 5px 10px !important;
  }

  .btn-beta-download {
    font-size: 0.92rem !important;
    padding: 0.85rem 1.1rem !important;
    width: 100% !important;
    justify-content: center !important;
  }

  .requirements-box {
    border-radius: 16px !important;
    margin-top: 1.5rem !important;
  }

  .req-header {
    padding: 0.9rem 1rem !important;
    font-size: 1rem !important;
  }

  .req-content-grid {
    grid-template-columns: 1fr !important;
    padding: 1.2rem 1rem !important;
    gap: 1.25rem !important;
  }

  .req-col h4 {
    font-size: 0.98rem !important;
    margin-bottom: 0.65rem !important;
  }

  .req-col ul li {
    font-size: 0.88rem !important;
    padding-left: 22px !important;
  }

  /* ==========================================================
     6. App Showcase & Interactive Slider
     ========================================================== */
  .macbook-mockup-frame {
    padding: 8px 8px 12px !important;
    border-radius: 16px !important;
  }

  .macbook-top-bar {
    padding-bottom: 8px !important;
    padding-left: 4px !important;
    gap: 6px !important;
  }

  .dot-btn {
    width: 9px !important;
    height: 9px !important;
  }

  .slider-arrow-btn {
    width: 36px !important;
    height: 36px !important;
    font-size: 0.95rem !important;
  }

  .slider-arrow-prev {
    left: 6px !important;
  }

  .slider-arrow-next {
    right: 6px !important;
  }

  .slide-caption-bar {
    font-size: 0.78rem !important;
    padding: 0.45rem 0.7rem !important;
  }

  .slider-tabs-nav {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
    width: 100% !important;
    margin-top: 1.2rem !important;
  }

  .slider-tab-btn {
    padding: 8px 10px !important;
    font-size: 0.78rem !important;
    justify-content: center !important;
    text-align: center !important;
    gap: 6px !important;
    border-radius: var(--radius-md) !important;
  }

  /* ==========================================================
     7. Features Grid (CRITICAL 1-COLUMN FIX)
     ========================================================== */
  .features-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }

  .feature-card {
    padding: 1.6rem 1.25rem !important;
    border-radius: 18px !important;
  }

  .feature-icon-box {
    width: 56px !important;
    height: 56px !important;
    font-size: 1.5rem !important;
    margin-bottom: 1rem !important;
    border-radius: 14px !important;
  }

  .feature-card h3 {
    font-size: 1.2rem !important;
    margin-bottom: 0.5rem !important;
  }

  .feature-card p {
    font-size: 0.92rem !important;
    line-height: 1.55 !important;
  }

  /* ==========================================================
     8. Testimonials & Team
     ========================================================== */
  .testimonials-grid {
    grid-template-columns: 1fr !important;
    gap: 1.25rem !important;
  }

  .testimonial-card {
    padding: 1.5rem 1.2rem !important;
    border-radius: 18px !important;
  }

  .testimonial-text {
    font-size: 0.92rem !important;
    line-height: 1.6 !important;
    margin-bottom: 1.2rem !important;
  }

  .team-grid {
    grid-template-columns: 1fr !important;
    gap: 1.5rem !important;
  }

  .team-card {
    padding: 1.8rem 1.25rem !important;
    border-radius: 18px !important;
  }

  .team-avatar-wrapper {
    width: 140px !important;
    height: 140px !important;
    margin-bottom: 1.1rem !important;
  }

  .avatar-badge {
    width: 32px !important;
    height: 32px !important;
    font-size: 1rem !important;
    bottom: 2px !important;
    right: 4px !important;
  }

  .team-card h3 {
    font-size: 1.3rem !important;
  }

  .team-role {
    font-size: 0.88rem !important;
    margin-bottom: 0.75rem !important;
  }

  .team-bio {
    font-size: 0.9rem !important;
    line-height: 1.55 !important;
  }

  /* ==========================================================
     9. FAQ Section
     ========================================================== */
  .faq-container {
    gap: 10px !important;
  }

  .faq-question {
    padding: 1rem 1.15rem !important;
    font-size: 0.95rem !important;
  }

  .faq-body {
    padding: 0 1.15rem 1.15rem !important;
    font-size: 0.9rem !important;
    line-height: 1.55 !important;
  }

  /* ==========================================================
     10. CTA Banner & Footer
     ========================================================== */
  .cta-banner {
    padding: 2rem 1.25rem !important;
    border-radius: 18px !important;
    gap: 1.5rem !important;
  }

  .cta-banner::before {
    display: none !important;
  }

  .cta-text h3 {
    font-size: 1.35rem !important;
    margin-bottom: 0.5rem !important;
  }

  .cta-text p {
    font-size: 0.9rem !important;
    line-height: 1.55 !important;
  }

  .cta-action {
    width: 100% !important;
  }

  .cta-action .btn {
    width: 100% !important;
    padding: 0.85rem 1.25rem !important;
    font-size: 0.95rem !important;
  }

  .site-footer {
    padding: 3.5rem 0 1.5rem !important;
  }

  .footer-grid {
    gap: 2rem !important;
    margin-bottom: 2.5rem !important;
  }

  .footer-col h3 {
    font-size: 1.15rem !important;
    margin-bottom: 1rem !important;
  }

  .footer-links {
    gap: 10px !important;
    font-size: 0.9rem !important;
  }

  .footer-bottom {
    font-size: 0.82rem !important;
    padding-top: 1.5rem !important;
  }

  /* ==========================================================
     11. Modals (Download, Donate, Lightbox)
     ========================================================== */
  .modal-overlay {
    padding: 1rem !important;
  }

  .modal-card {
    padding: 2rem 1.25rem;
    padding: 1.75rem 1.15rem !important;
    border-radius: 20px !important;
    max-height: 92vh !important;
  }

  .modal-close-btn {
    top: 1rem !important;
    right: 1rem !important;
    width: 34px !important;
    height: 34px !important;
    font-size: 1.1rem !important;
  }

  .modal-header {
    margin-bottom: 1.25rem !important;
  }

  .modal-header-icon {
    width: 56px !important;
    height: 56px !important;
    font-size: 1.7rem !important;
    margin-bottom: 0.85rem !important;
  }

  .modal-title {
    font-size: 1.45rem !important;
  }

  .modal-body {
    font-size: 0.92rem !important;
    margin-bottom: 1.5rem !important;
  }

  .modal-alert-box {
    padding: 0.85rem 1rem !important;
    font-size: 0.88rem !important;
    margin: 1.1rem 0 !important;
  }

  .donate-items-grid {
    grid-template-columns: 1fr;
    grid-template-columns: 1fr !important;
    gap: 8px !important;
    margin: 1.2rem 0 !important;
  }

  .hero-logo-img {
    width: 105px;
    max-width: 105px;
  .donate-item-card {
    flex-direction: row !important;
    justify-content: space-between !important;
    padding: 10px 14px !important;
    align-items: center !important;
  }

  .donate-item-icon {
    font-size: 1.5rem !important;
  }

  .donate-item-name {
    font-size: 0.95rem !important;
  }

  .donate-item-price {
    font-size: 0.85rem !important;
    padding: 3px 10px !important;
  }

  .qr-code-img {
    max-width: 180px !important;
  }

  .bank-info-card {
    padding: 10px 14px !important;
    font-size: 0.85rem !important;
    max-width: 100% !important;
  }

  .bank-copy-row {
    flex-wrap: wrap !important;
    gap: 4px !important;
  }

  .bank-select-control {
    max-width: 100% !important;
    padding: 10px 12px !important;
    font-size: 0.88rem !important;
  }

  .btn-open-bank {
    max-width: 100% !important;
    padding: 0.85rem 1.2rem !important;
    font-size: 0.92rem !important;
  }

  .lightbox-modal img {
    max-width: 95vw !important;
    max-height: 80vh !important;
  }
}

/* ==========================================================
   Extra Small Phones (320px - 480px)
   ========================================================== */
@media (max-width: 480px) {
  .container {
    width: 94% !important;
  }

  .hero-title {
    font-size: 1.6rem !important;
  }

  .hero-stats {
    padding: 1.2rem;
    gap: 0.6rem 0.4rem !important;
    padding: 0.85rem 0.6rem !important;
  }

  .stat-number {
    font-size: 1.6rem;
    font-size: 1.35rem !important;
  }

  .stat-label {
    font-size: 0.72rem !important;
  }

  .slider-tabs-nav {
    grid-template-columns: 1fr 1fr !important;
    gap: 6px !important;
  }

  .slider-tab-btn {
    font-size: 0.74rem !important;
    padding: 7px 4px !important;
  }

  .version-item {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 8px !important;
  }

  .version-item .btn-mini-download {
    width: 100% !important;
    justify-content: center !important;
  }
}