/* ============================================================
   newyork699 — CSS Design System
   Theme: Deep Sapphire Blue + Neon Cyan + Electric Silver
   Font: Kanit (Google Fonts)
   ============================================================ */

/* ============================================================
   1. CSS RESET
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Kanit', sans-serif;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ============================================================
   2. CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Core Colors */
  --color-bg-primary: #050D1A;
  --color-bg-secondary: #0A1F3D;
  --color-bg-card: #0D2444;
  --color-bg-header: rgba(5, 13, 26, 0.97);
  --color-accent: #00D4FF;
  --color-accent-hover: #33DDFF;
  --color-accent-glow: rgba(0, 212, 255, 0.3);
  --color-highlight: #7DF9FF;
  --color-gold: #FFD700;
  --color-gold-light: #FFE44D;
  --color-silver: #B0C4DE;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B0C4DE;
  --color-text-muted: #6A8FAB;
  --color-border: rgba(0, 212, 255, 0.2);
  --color-border-strong: rgba(0, 212, 255, 0.5);
  --color-overlay: rgba(5, 13, 26, 0.75);

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #050D1A 0%, #0A1F3D 50%, #0D3060 100%);
  --gradient-accent: linear-gradient(135deg, #00D4FF 0%, #0099CC 100%);
  --gradient-button: linear-gradient(135deg, #00D4FF 0%, #007ACC 100%);
  --gradient-button-hover: linear-gradient(135deg, #33DDFF 0%, #00A0FF 100%);
  --gradient-card: linear-gradient(145deg, #0D2444 0%, #0A1F3D 100%);
  --gradient-gold: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);

  /* Typography Scale */
  --font-family: 'Kanit', sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */
  --font-size-4xl: 3rem;      /* 48px */
  --font-size-5xl: 3.75rem;   /* 60px */

  /* Spacing Tokens */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
  --shadow-accent: 0 0 20px rgba(0, 212, 255, 0.4);
  --shadow-accent-strong: 0 0 40px rgba(0, 212, 255, 0.6);
  --shadow-gold: 0 0 20px rgba(255, 215, 0, 0.4);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
}

/* ============================================================
   3. TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-md); }
h6 { font-size: var(--font-size-base); }

p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  line-height: 1.8;
}

strong, b {
  font-weight: 700;
  color: var(--color-text-primary);
}

.text-accent { color: var(--color-accent); }
.text-gold { color: var(--color-gold); }
.text-highlight { color: var(--color-highlight); }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  margin-top: var(--space-3);
}

.section-title.text-center::after {
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   4. LAYOUT
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-20) 0;
}

.section-alt {
  padding: var(--space-20) 0;
  background: var(--color-bg-secondary);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.flex {
  display: flex;
  align-items: center;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* ============================================================
   5. HEADER
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg-header);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo img {
  height: 56px;
  width: auto;
}

.site-logo img + .site-logo-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.site-logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-accent);
  text-shadow: var(--shadow-accent);
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.main-nav a {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-accent);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  transform: scaleX(1);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Hamburger */
.hamburger-btn {
  display: none;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  transition: background var(--transition-base);
}

.hamburger-btn:hover {
  background: var(--color-bg-card);
  border-color: var(--color-accent);
}

.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.hamburger-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav — OUTSIDE header */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  z-index: 999;
  padding: var(--space-4) var(--space-6);
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-md);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  color: var(--color-accent);
  background: var(--color-bg-card);
}

.mobile-nav .mobile-cta-wrap {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2);
}

/* ============================================================
   6. HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(5,13,26,0.9) 0%, rgba(10,31,61,0.7) 50%, rgba(5,13,26,0.6) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: var(--space-16) 0;
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero-text h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-6);
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.hero-text h1 span {
  color: var(--color-accent);
  text-shadow: var(--shadow-accent);
}

.hero-text p {
  font-size: var(--font-size-md);
  color: var(--color-silver);
  margin-bottom: var(--space-8);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
}

.hero-image img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-accent-strong);
  margin-left: auto;
}

.hero-badge {
  position: absolute;
  top: -10px;
  right: -10px;
  background: var(--gradient-gold);
  color: #000;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-gold);
}

/* ============================================================
   7. CONTENT SECTIONS
   ============================================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header p {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.content-section {
  padding: var(--space-20) 0;
}

.content-section:nth-child(even) {
  background: var(--color-bg-secondary);
}

/* Feature Cards */
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-accent);
}

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

.feature-icon {
  width: 60px;
  height: 60px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: var(--space-4);
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Two Column Section */
.two-col-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.two-col-section.reverse {
  direction: rtl;
}

.two-col-section.reverse > * {
  direction: ltr;
}

.two-col-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.two-col-content h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-6);
  color: var(--color-text-primary);
}

.two-col-content p {
  margin-bottom: var(--space-4);
}

/* Highlight List */
.highlight-list {
  margin: var(--space-4) 0 var(--space-6);
}

.highlight-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.highlight-list li:last-child {
  border-bottom: none;
}

.highlight-list li::before {
  content: '✦';
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Stats Bar */
.stats-bar {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  text-align: center;
}

.stat-item {
  padding: var(--space-4);
  border-right: 1px solid var(--color-border);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-accent);
  text-shadow: var(--shadow-accent);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  display: block;
  margin-top: var(--space-1);
}

/* ============================================================
   8. TABLE OF CONTENTS
   ============================================================ */
.toc-container {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  margin: var(--space-10) 0;
}

.toc-container h2 {
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.toc-container h2::before {
  content: '📋';
  font-size: 1.2rem;
}

.toc-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.toc-list li {
  counter-increment: toc-counter;
}

.toc-list a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.toc-list a:hover {
  color: var(--color-accent);
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--color-border);
}

.toc-list a::before {
  content: counter(toc-counter) ".";
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--font-size-xs);
  min-width: 20px;
}

/* ============================================================
   9. FAQ SECTION
   ============================================================ */
.faq-section {
  padding: var(--space-20) 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.faq-item:hover {
  border-color: var(--color-border-strong);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  transition: background var(--transition-base);
  gap: var(--space-4);
}

.faq-question:hover {
  background: rgba(0, 212, 255, 0.05);
}

.faq-question h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
  flex: 1;
}

.faq-icon {
  width: 28px;
  height: 28px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform var(--transition-base), background var(--transition-base);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin: 0;
}

/* ============================================================
   10. FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-8);
  padding-bottom: var(--space-12);
}

.footer-brand-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-accent);
  text-shadow: var(--shadow-accent);
  display: block;
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.footer-col h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  text-align: center;
}

.footer-bottom p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

/* ============================================================
   11. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-button);
  color: var(--color-bg-primary);
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  background: var(--gradient-button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.55);
  color: var(--color-bg-primary);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--color-accent-hover);
  color: var(--color-accent-hover);
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--gradient-gold);
  color: #000;
  font-weight: 700;
  box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(255, 215, 0, 0.6);
  color: #000;
}

.btn-lg {
  padding: var(--space-4) var(--space-10);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-sm);
}

/* CTA Button (register) */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  background: var(--gradient-button);
  color: var(--color-bg-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 700;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.35);
}

.cta-button:hover {
  background: var(--gradient-button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.55);
  color: var(--color-bg-primary);
}

/* Floating CTA */
.floating-cta {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-3);
}

.floating-cta-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-button);
  color: var(--color-bg-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 700;
  border-radius: var(--radius-full);
  box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5), 0 2px 8px rgba(0,0,0,0.4);
  text-decoration: none;
  transition: all var(--transition-base);
  animation: float-pulse 2s ease-in-out infinite;
}

.floating-cta-btn:hover {
  background: var(--gradient-button-hover);
  transform: scale(1.05);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.7), 0 2px 8px rgba(0,0,0,0.5);
  color: var(--color-bg-primary);
}

@keyframes float-pulse {
  0%, 100% { box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5), 0 2px 8px rgba(0,0,0,0.4); }
  50% { box-shadow: 0 6px 40px rgba(0, 212, 255, 0.8), 0 2px 8px rgba(0,0,0,0.4); }
}

/* ============================================================
   12. INPUT FIELDS / FORMS
   ============================================================ */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-base);
  outline: none;
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* Login Form */
.login-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  max-width: 440px;
  width: 100%;
}

.login-card h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-8);
  text-align: center;
  color: var(--color-text-primary);
}

/* ============================================================
   13. RESPONSIVE
   ============================================================ */

/* Tablet — 768px to 1023px */
@media (max-width: 1023px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.625rem;
  }

  .main-nav,
  .header-cta {
    display: none;
  }

  .hamburger-btn {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-image {
    display: none;
  }

  .hero-cta {
    justify-content: center;
  }

  .grid-2,
  .two-col-section {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .two-col-section.reverse {
    direction: ltr;
  }

  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

  .stats-bar {
    grid-template-columns: 1fr 1fr;
  }

  .stat-item:nth-child(2),
  .stat-item:nth-child(4) {
    border-right: none;
  }

  .stat-item:nth-child(1),
  .stat-item:nth-child(2) {
    border-bottom: 1px solid var(--color-border);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

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

/* Mobile — below 767px */
@media (max-width: 767px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.5rem;
    --font-size-xl: 1.25rem;
  }

  .container {
    padding: 0 var(--space-4);
    max-width: 100%;
  }

  .section,
  .content-section,
  .section-alt {
    padding: var(--space-12) 0;
    max-width: 100%;
  }

  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }

  .hero {
    min-height: 480px;
  }

  .hero-text h1 {
    font-size: var(--font-size-3xl);
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .floating-cta {
    bottom: var(--space-4);
    right: var(--space-4);
  }

  .floating-cta-btn {
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
  }

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

  .login-card {
    padding: var(--space-6);
  }

  .promo-image-wrap {
    max-width: 100%;
  }

  img,
  video,
  iframe {
    max-width: 100%;
    height: auto;
  }

  table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
  }

  pre {
    overflow-x: auto;
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn,
  .hero-cta .cta-button {
    width: 100%;
    text-align: center;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .stat-item:last-child {
    border-bottom: none;
  }
}

/* ============================================================
   14. ANIMATIONS & EFFECTS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 10px rgba(0, 212, 255, 0.3); }
  50% { box-shadow: 0 0 30px rgba(0, 212, 255, 0.7); }
}

@keyframes ticker-scroll {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-glow {
  animation: glow-pulse 2s ease-in-out infinite;
}

/* Ticker */
.ticker {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) 0;
  overflow: hidden;
  white-space: nowrap;
}

.ticker-inner {
  display: inline-block;
  animation: ticker-scroll 30s linear infinite;
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding-right: var(--space-16);
}

/* ============================================================
   15. PAGE-SPECIFIC: PROMOTION
   ============================================================ */
.promo-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  margin-bottom: var(--space-10);
}

.promo-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-accent);
  transform: translateY(-2px);
}

.promo-image-wrap {
  max-width: 600px;
  margin: 0 auto var(--space-6);
}

.promo-image-wrap img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.promo-body {
  padding: var(--space-8);
}

.promo-badge {
  display: inline-block;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--color-border-strong);
  color: var(--color-accent);
  font-size: var(--font-size-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-3);
}

.promo-body h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.promo-details {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.promo-detail-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

.promo-detail-row:last-child {
  border-bottom: none;
}

.promo-detail-row .label {
  color: var(--color-text-muted);
}

.promo-detail-row .value {
  color: var(--color-accent);
  font-weight: 600;
}

/* ============================================================
   16. PAGE-SPECIFIC: LOGIN
   ============================================================ */
.login-hero {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  background: var(--gradient-hero);
  overflow: hidden;
}

.login-hero-bg {
  position: absolute;
  inset: 0;
}

.login-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.login-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(5,13,26,0.9) 0%, rgba(10,31,61,0.75) 100%);
}

.login-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: var(--space-12) 0;
}

.login-page-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.login-form-col {
  position: sticky;
  top: calc(var(--header-height) + var(--space-8));
}

@media (max-width: 1023px) {
  .login-page-layout {
    grid-template-columns: 1fr;
  }

  .login-form-col {
    position: static;
  }
}

/* ============================================================
   17. PAGE-SPECIFIC: BLOG
   ============================================================ */
.blog-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-12);
  align-items: start;
}

.blog-post-header {
  margin-top: var(--header-height);
  background: var(--gradient-hero);
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-border);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.post-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.post-cat-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--color-border-strong);
  color: var(--color-accent);
  font-size: var(--font-size-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.blog-featured-img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  margin: var(--space-8) 0;
}

.blog-content h2 {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  margin: var(--space-10) 0 var(--space-5);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.blog-content h2:first-of-type {
  margin-top: var(--space-6);
  border-top: none;
  padding-top: 0;
}

.blog-content p {
  margin-bottom: var(--space-5);
  line-height: 1.9;
}

.blog-content ul {
  margin: var(--space-4) 0 var(--space-6) var(--space-6);
  list-style: disc;
}

.blog-content ul li {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  padding-left: var(--space-2);
}

.blog-content ol {
  margin: var(--space-4) 0 var(--space-6) var(--space-6);
  list-style: decimal;
}

.blog-content ol li {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.blog-content a {
  color: var(--color-accent);
  text-decoration: underline;
}

.blog-related-links {
  margin-top: var(--space-10);
  padding: var(--space-6);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.blog-related-links h3 {
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.blog-related-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.blog-related-links ul li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.blog-related-links ul li:last-child {
  border-bottom: none;
}

.blog-related-links ul li a {
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
  text-decoration: none;
}

.blog-related-links ul li a:hover {
  color: var(--color-accent);
}

@media (max-width: 1023px) {
  .blog-layout {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   18. PAGE-SPECIFIC: ARCHIVE
   ============================================================ */
.archive-hero {
  margin-top: var(--header-height);
  background: var(--gradient-hero);
  padding: var(--space-16) 0;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.archive-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
}

.archive-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-accent);
}

.archive-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.archive-card-body {
  padding: var(--space-5);
}

.archive-card-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.archive-card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.archive-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: gap var(--transition-base);
}

.archive-card-link:hover {
  gap: var(--space-3);
  color: var(--color-accent-hover);
}

@media (max-width: 767px) {
  .archive-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .archive-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   19. UTILITIES
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.w-full { width: 100%; }

.border-accent {
  border: 1px solid var(--color-border-strong) !important;
}

.bg-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

/* Lazy load */
img[data-src] {
  opacity: 0;
  transition: opacity 0.5s ease;
}

img.loaded {
  opacity: 1;
}

/* Section divider */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

/* Notice box */
.notice-box {
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
}

.notice-box p {
  margin-bottom: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  left: var(--space-6);
  width: 44px;
  height: 44px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-base);
  opacity: 0;
  pointer-events: none;
  z-index: 800;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-bg-card);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-accent);
}