/* ==========================================================================
   DESIGN TOKENS — mirrored from variables.css
   ========================================================================== */
:root {
  color-scheme: dark;

  /* Primary (Teal) */
  --clr-primary-300: #4db8b8;
  --clr-primary-400: #2d9e9e;
  --clr-primary-500: #1a8a8a;
  --clr-primary-600: #0f4c5c;
  --clr-primary-700: #0a3540;
  --clr-primary-800: #072830;
  --clr-primary-900: #041a20;
  --clr-primary-a10: rgba(45, 158, 158, 0.1);
  --clr-primary-a20: rgba(45, 158, 158, 0.2);
  --clr-primary-a30: rgba(45, 158, 158, 0.3);

  /* Accent (Gold) */
  --clr-accent-400: #e8c86e;
  --clr-accent-500: #d4af37;
  --clr-accent-a10: rgba(212, 175, 55, 0.1);
  --clr-accent-a20: rgba(212, 175, 55, 0.2);
  --clr-accent-a30: rgba(212, 175, 55, 0.3);
  --clr-accent-a50: rgba(212, 175, 55, 0.5);

  /* Neutrals */
  --clr-white-a05: rgba(255, 255, 255, 0.05);
  --clr-white-a10: rgba(255, 255, 255, 0.1);
  --clr-white-a15: rgba(255, 255, 255, 0.15);
  --clr-white-a30: rgba(255, 255, 255, 0.3);
  --clr-black-a20: rgba(0, 0, 0, 0.2);
  --clr-black-a30: rgba(0, 0, 0, 0.3);
  --clr-black-a40: rgba(0, 0, 0, 0.4);

  /* Semantic */
  --clr-bg-gradient: linear-gradient(135deg, #0a3540 0%, #1a4a5a 50%, #0f3545 100%);
  --clr-bg-dark: #061922;
  --clr-bg-card: rgba(26, 58, 74, 0.6);
  --clr-bg-card-solid: #1a3a4a;
  --clr-text-primary: #ffffff;
  --clr-text-secondary: #d0e0f0;
  --clr-text-muted: #a0b0c0;
  --clr-border: var(--clr-primary-a30);
  --clr-border-light: var(--clr-white-a10);

  /* Typography */
  --ff-primary: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --ff-decorative: 'Amiri', Georgia, serif;

  /* Font Scale */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 1.75rem;
  --fs-3xl: 2rem;
  --fs-4xl: 2.5rem;

  /* Font Weights */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* Spacing */
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-12: 3rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-pill: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px var(--clr-black-a20);
  --shadow-md: 0 4px 6px var(--clr-black-a30);
  --shadow-lg: 0 10px 25px var(--clr-black-a40);
  --shadow-glow: 0 0 15px var(--clr-accent-a30);
  --shadow-modal: 0 20px 60px var(--clr-black-a40), 0 0 40px var(--clr-black-a10), inset 0 1px 0 var(--clr-white-a10);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 0.5s ease;
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--ff-primary);
  font-weight: var(--fw-regular);
  background-color: var(--clr-bg-dark);
  color: var(--clr-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100svh;
  overflow-x: hidden;
}

/* ==========================================================================
   ANIMATED BACKGROUND
   ========================================================================== */
.bg-canvas {
  position: fixed;
  top: -100px;
  bottom: -100px;
  left: 0;
  right: 0;
  z-index: 0;
  background: var(--clr-bg-gradient);
  overflow: hidden;
}

.bg-canvas::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  top: -150px;
  right: -150px;
  background: radial-gradient(circle, rgba(45, 158, 158, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  animation: float-orb 12s ease-in-out infinite;
}

.bg-canvas::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  bottom: -100px;
  left: -100px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: float-orb 15s ease-in-out infinite reverse;
}

.bg-stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255, 255, 255, 0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 40%, rgba(255, 255, 255, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 10%, rgba(255, 255, 255, 0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 60%, rgba(255, 255, 255, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 25%, rgba(255, 255, 255, 0.4) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 40% 75%, rgba(212, 175, 55, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 90%, rgba(255, 255, 255, 0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 80%, rgba(255, 255, 255, 0.35) 0%, transparent 100%);
}

@keyframes float-orb {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(30px, -20px) scale(1.05);
  }

  66% {
    transform: translate(-20px, 15px) scale(0.97);
  }
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */
.page-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header {
  padding: var(--sp-6) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(6, 25, 34, 0.8);
  border-bottom: 1px solid var(--clr-border-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  color: var(--clr-text-primary);
  letter-spacing: 0.5px;
}

.brand-subtitle {
  font-size: var(--fs-xs);
  color: var(--clr-accent-500);
  font-weight: var(--fw-medium);
  letter-spacing: 1px;
  margin-top: 2px;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--clr-accent-a10);
  border: 1px solid var(--clr-accent-a20);
  border-radius: var(--radius-pill);
  padding: 4px;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--clr-text-muted);
  font-family: var(--ff-primary);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.lang-btn i {
  font-size: 14px;
}

.lang-btn.active {
  background: var(--clr-accent-500);
  color: #0a2a1a;
  box-shadow: 0 2px 8px var(--clr-accent-a30);
}

.lang-btn:not(.active):hover {
  color: var(--clr-accent-400);
  background: var(--clr-accent-a10);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  padding: var(--sp-12) 0 var(--sp-8);
  text-align: center;
}

.hero-ornament {
  font-family: var(--ff-decorative);
  font-size: var(--fs-2xl);
  color: var(--clr-accent-500);
  opacity: 0.7;
  margin-bottom: var(--sp-4);
  display: block;
  animation: fade-in 0.8s ease forwards;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--clr-primary-a10);
  border: 1px solid var(--clr-primary-a30);
  border-radius: var(--radius-pill);
  padding: 6px 16px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-primary-300);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--sp-5);
  animation: fade-slide-up 0.6s ease 0.1s both;
}

.hero-badge i {
  font-size: 14px;
}

.hero-title {
  font-family: var(--ff-decorative);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: var(--fw-bold);
  color: var(--clr-text-primary);
  line-height: 1.15;
  margin-bottom: var(--sp-4);
  animation: fade-slide-up 0.6s ease 0.2s both;
}

.hero-title .accent {
  color: var(--clr-accent-500);
  display: block;
}

.hero-description {
  font-size: var(--fs-base);
  color: var(--clr-text-secondary);
  max-width: 560px;
  margin: 0 auto var(--sp-6);
  line-height: 1.7;
  animation: fade-slide-up 0.6s ease 0.3s both;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
  animation: fade-slide-up 0.6s ease 0.4s both;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.hero-meta-item i {
  font-size: 14px;
  color: var(--clr-accent-500);
}

.hero-divider {
  margin: var(--sp-8) 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--clr-accent-a30), transparent);
  animation: fade-in 1s ease 0.5s both;
}

/* ==========================================================================
   CONTENT SECTIONS
   ========================================================================== */
.content {
  flex: 1;
  padding-bottom: var(--sp-12);
}

.section-card {
  background: var(--clr-bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-xl);
  padding: var(--sp-8);
  margin-bottom: var(--sp-6);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, border-color var(--transition-normal), box-shadow var(--transition-normal);
  scroll-margin-top: 100px;
}

.section-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--clr-accent-a30), transparent);
}

.section-card:hover {
  border-color: var(--clr-primary-a20);
  box-shadow: 0 8px 32px var(--clr-black-a30);
}

.section-header {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
}

.section-icon {
  width: 44px;
  height: 44px;
  background: var(--clr-accent-a10);
  border: 1px solid var(--clr-accent-a20);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--clr-accent-500);
  font-size: 20px;
}

.section-title-group {
  flex: 1;
}

.section-number {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-accent-500);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.section-title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
  line-height: 1.3;
}

.section-body {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.75;
}

.section-body p {
  margin-bottom: var(--sp-4);
}

.section-body p:last-child {
  margin-bottom: 0;
}

.section-body strong {
  color: var(--clr-text-primary);
  font-weight: var(--fw-semibold);
}

/* Info List */
.info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin: var(--sp-4) 0;
}

.info-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.6;
}

.info-list li i {
  font-size: 16px;
  color: var(--clr-primary-400);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Permission Chips */
.permission-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.permission-chip {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  background: var(--clr-white-a05);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-lg);
  padding: var(--sp-3) var(--sp-4);
  transition: border-color var(--transition-normal), background var(--transition-normal);
}

.permission-chip:hover {
  background: var(--clr-primary-a10);
  border-color: var(--clr-primary-a30);
}

.permission-chip i {
  font-size: 18px;
  color: var(--clr-accent-500);
  flex-shrink: 0;
}

.permission-chip-text {
  display: flex;
  flex-direction: column;
}

.permission-name {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
  word-break: break-word;
}

.permission-desc {
  font-size: 11px;
  color: var(--clr-text-muted);
  margin-top: 1px;
}

/* Contact Card */
.contact-card {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  background: var(--clr-accent-a10);
  border: 1px solid var(--clr-accent-a20);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  margin-top: var(--sp-4);
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--clr-accent-a20);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent-500);
  font-size: 20px;
  flex-shrink: 0;
}

.contact-info {
  flex: 1;
}

.contact-label {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  margin-bottom: 2px;
}

.contact-value {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-accent-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-value:hover {
  color: var(--clr-accent-500);
}

/* Highlight box */
.highlight-box {
  background: var(--clr-primary-a10);
  border-left: 3px solid var(--clr-primary-400);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--sp-4) var(--sp-5);
  margin: var(--sp-4) 0;
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   TABLE OF CONTENTS
   ========================================================================== */
.toc-card {
  background: var(--clr-white-a05);
  border: 1px solid var(--clr-border-light);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
  margin-bottom: var(--sp-6);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.toc-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.toc-title {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.toc-title i {
  font-size: 14px;
  color: var(--clr-accent-500);
}

.toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--sp-2);
}

.toc-list a {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  color: var(--clr-text-secondary);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.toc-list a:hover {
  background: var(--clr-primary-a10);
  color: var(--clr-primary-300);
  padding-left: 14px;
}

.toc-list a i {
  font-size: 13px;
  color: var(--clr-accent-500);
  flex-shrink: 0;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--clr-border-light);
  padding: var(--sp-8) 0;
  text-align: center;
}

.footer-ornament {
  font-family: var(--ff-decorative);
  font-size: var(--fs-lg);
  color: var(--clr-accent-a50);
  display: block;
  margin-bottom: var(--sp-4);
}

.footer-app {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.footer-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  object-fit: cover;
  opacity: 0.8;
}

.footer-app-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-secondary);
}

.footer-copy {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  line-height: 1.7;
}

.footer-copy a {
  color: var(--clr-accent-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-copy a:hover {
  color: var(--clr-accent-400);
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.footer-links a {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--clr-primary-300);
}

.footer-divider {
  color: var(--clr-border-light);
  font-size: 10px;
}

/* ==========================================================================
   SCROLL PROGRESS BAR
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(to right, var(--clr-accent-500), var(--clr-primary-400));
  z-index: 9999;
  width: 0%;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--clr-accent-a50);
}

/* ==========================================================================
   BACK TO TOP BUTTON
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--clr-accent-a20);
  border: 1px solid var(--clr-accent-a30);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent-500);
  font-size: 20px;
  cursor: pointer;
  z-index: 200;
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  text-decoration: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.back-to-top:hover {
  background: var(--clr-accent-a30);
  box-shadow: var(--shadow-glow);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fade-slide-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   SCROLLBAR
   ========================================================================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--clr-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--clr-primary-700);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--clr-primary-500);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--sp-4);
  }

  .hero {
    padding: var(--sp-8) 0 var(--sp-6);
  }

  .section-card {
    padding: var(--sp-5);
  }

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

  .toc-list {
    grid-template-columns: 1fr;
  }

  .hero-meta {
    gap: var(--sp-4);
  }

  .header-inner {
    flex-wrap: nowrap;
  }

  .brand-name {
    font-size: 0.8rem;
  }

  .brand-subtitle {
    font-size: 10px;
  }

  .section-header {
    gap: var(--sp-3);
  }

  .section-icon {
    width: 36px;
    height: 36px;
    font-size: 18px;
  }

  .section-title {
    font-size: var(--fs-md);
  }

  .contact-card {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
  }
}

@media (max-width: 400px) {
  .brand-subtitle {
    display: none;
  }

  .lang-btn {
    padding: 6px 10px;
  }
}