/* ============================================
   QUANTUM.AI — Design System & Styles (V1)
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --bg-primary: #06080f;
  --bg-secondary: #0d1117;
  --bg-card: rgba(15, 20, 35, 0.7);
  --bg-card-hover: rgba(20, 28, 50, 0.85);
  --bg-input: rgba(15, 20, 40, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.03);

  --accent-purple: #7c3aed;
  --accent-purple-light: #a78bfa;
  --accent-cyan: #06b6d4;
  --accent-cyan-light: #22d3ee;
  --accent-gradient: linear-gradient(135deg, #7c3aed, #06b6d4);
  --accent-gradient-hover: linear-gradient(135deg, #8b5cf6, #22d3ee);

  --text-primary: #f0f0f5;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-accent: #a78bfa;

  --border-color: rgba(124, 58, 237, 0.15);
  --border-glow: rgba(124, 58, 237, 0.4);
  --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.15);
  --shadow-glow-strong: 0 0 60px rgba(124, 58, 237, 0.25);

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 70px;
  --sidebar-width: 280px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

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

ul,
ol {
  list-style: none;
}

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

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

input,
textarea {
  font-family: inherit;
}

/* ---------- Utility Classes ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.glow-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  background: var(--accent-gradient);
  color: white;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  border: none;
  letter-spacing: 0.02em;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-gradient-hover);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span {
  position: relative;
  z-index: 1;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 13px 30px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  letter-spacing: 0.02em;
}

.btn-secondary:hover {
  border-color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.08);
  transform: translateY(-2px);
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.3), transparent);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

/* ---------- Background Effects ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(124, 58, 237, 0.08) 1px, transparent 0);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow-orb--purple {
  width: 500px;
  height: 500px;
  background: rgba(124, 58, 237, 0.08);
  top: -100px;
  right: -100px;
}

.bg-glow-orb--cyan {
  width: 400px;
  height: 400px;
  background: rgba(6, 182, 212, 0.06);
  bottom: -100px;
  left: -100px;
}

/* ---------- Keyframe Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes glowPulse {

  0%,
  100% {
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.2);
  }

  50% {
    box-shadow: 0 0 40px rgba(124, 58, 237, 0.4);
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

@keyframes typingDot {

  0%,
  80%,
  100% {
    opacity: 0.3;
    transform: scale(0.8);
  }

  40% {
    opacity: 1;
    transform: scale(1);
  }
}

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

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }

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

@keyframes codeScroll {
  0% {
    transform: translateY(0);
  }

  100% {
    transform: translateY(-50%);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Logo Images ---------- */
.logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: inherit;
}

.footer-logo-img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  vertical-align: middle;
  margin-right: 4px;
}

.welcome-logo-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.avatar-logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: inherit;
}


/* ============================================
   LANDING PAGE STYLES
   ============================================ */

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-2xl);
  background: rgba(6, 8, 15, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(6, 8, 15, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px;
  font-size: 0.9rem;
}

/* Mobile nav */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 18px;
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--accent-purple-light);
  font-weight: 500;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: glowPulse 2s infinite;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 520px;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-stats {
  display: flex;
  gap: var(--space-2xl);
  margin-top: var(--space-3xl);
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Hero Code Preview */
.hero-visual {
  position: relative;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.code-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glow-strong);
  animation: float 6s ease-in-out infinite;
}

.code-window-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--border-color);
}

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

.code-dot--red {
  background: #ef4444;
}

.code-dot--yellow {
  background: #eab308;
}

.code-dot--green {
  background: #22c55e;
}

.code-window-title {
  margin-left: var(--space-sm);
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-window-body {
  padding: var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.8;
  height: 320px;
  overflow: hidden;
  position: relative;
}

.code-window-body::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-secondary));
}

.code-line {
  white-space: pre;
}

.code-keyword {
  color: #c084fc;
}

.code-function {
  color: #60a5fa;
}

.code-string {
  color: #34d399;
}

.code-comment {
  color: #6b7280;
  font-style: italic;
}

.code-variable {
  color: #f9a8d4;
}

.code-number {
  color: #fbbf24;
}

.code-operator {
  color: #94a3b8;
}

/* ---------- Features Section ---------- */
.features {
  padding: var(--space-4xl) 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--accent-cyan-light);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

.feature-card {
  text-align: center;
  padding: var(--space-3xl) var(--space-2xl);
}

.feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
  font-size: 1.6rem;
  position: relative;
}

.feature-icon--purple {
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.feature-icon--cyan {
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.feature-icon--green {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---------- How It Works Section ---------- */
.how-it-works {
  padding: var(--space-4xl) 0;
  position: relative;
  z-index: 1;
}

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

.steps-grid::before {
  content: '';
  position: absolute;
  top: 45px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan), var(--accent-purple));
  opacity: 0.3;
}

.step-card {
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 auto var(--space-lg);
  box-shadow: 0 0 30px rgba(124, 58, 237, 0.3);
  position: relative;
  z-index: 2;
}

.step-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.step-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  max-width: 280px;
  margin: 0 auto;
}

/* ---------- CTA Section ---------- */
.cta-section {
  padding: var(--space-4xl) 0;
  position: relative;
  z-index: 1;
}

.cta-box {
  text-align: center;
  padding: var(--space-4xl) var(--space-2xl);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(124, 58, 237, 0.08), transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
  position: relative;
}

.cta-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--space-2xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: 1;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text-secondary);
}

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


/* ============================================
   CHAT PAGE STYLES
   ============================================ */

.chat-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ---------- Chat Sidebar ---------- */
.chat-sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 10;
  transition: transform var(--transition-base);
}

.sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.new-chat-btn {
  width: 100%;
  padding: 12px;
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-md);
  color: var(--accent-purple-light);
  font-weight: 500;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-base);
}

.new-chat-btn:hover {
  background: rgba(124, 58, 237, 0.18);
  border-color: var(--accent-purple);
}

.sidebar-chats {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm);
}

.chat-history-item {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.chat-history-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
}

.chat-history-item.active {
  background: rgba(124, 58, 237, 0.1);
  color: var(--text-primary);
  border: 1px solid rgba(124, 58, 237, 0.15);
}

.chat-history-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.chat-history-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.sidebar-home-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.88rem;
  padding: 10px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.sidebar-home-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

/* ---------- Chat Main ---------- */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(6, 8, 15, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.chat-header-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
}

.chat-header-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: #22c55e;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: glowPulse 2s infinite;
}

.mobile-sidebar-toggle {
  display: none;
  padding: 8px;
  color: var(--text-secondary);
  font-size: 1.3rem;
}

/* ---------- Chat Messages ---------- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(124, 58, 237, 0.2);
  border-radius: 3px;
}

/* Welcome Screen */
.chat-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.welcome-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-glow-strong);
}

.welcome-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.welcome-subtitle {
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 400px;
}

.welcome-suggestions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  max-width: 560px;
  width: 100%;
}

.suggestion-chip {
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-align: left;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.suggestion-chip:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.suggestion-chip-icon {
  margin-bottom: 6px;
  font-size: 1.1rem;
}

/* Message Bubbles */
.message {
  display: flex;
  gap: var(--space-md);
  max-width: 780px;
  width: 100%;
  animation: fadeInUp 0.3s ease;
}

.message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message--ai {
  align-self: flex-start;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.message--ai .message-avatar {
  background: var(--accent-gradient);
  box-shadow: 0 0 15px rgba(124, 58, 237, 0.25);
}

.message--user .message-avatar {
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.message-content {
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  line-height: 1.7;
  font-size: 0.95rem;
}

.message--ai .message-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-top-left-radius: 4px;
}

.message--user .message-content {
  background: rgba(124, 58, 237, 0.15);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-top-right-radius: 4px;
  color: var(--text-primary);
}

/* Code blocks in messages */
.message-content pre {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius-md);
  padding: 16px;
  margin: 12px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
}

.message-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(124, 58, 237, 0.12);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-purple-light);
}

.message-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

.message-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.message-content ul,
.message-content ol {
  margin: 8px 0;
  padding-left: 20px;
}

.message-content li {
  list-style: disc;
  margin-bottom: 4px;
  color: var(--text-secondary);
}

.message-content ol li {
  list-style: decimal;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: var(--space-md);
  animation: fadeIn 0.3s ease;
}

.typing-dots {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  border-top-left-radius: 4px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-purple-light);
  border-radius: 50%;
  animation: typingDot 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
  animation-delay: 0.4s;
}

/* ---------- Chat Input ---------- */
.chat-input-area {
  padding: var(--space-lg) var(--space-2xl);
  border-top: 1px solid var(--border-color);
  background: rgba(6, 8, 15, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.chat-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 6px 6px 6px 20px;
  transition: border-color var(--transition-fast);
}

.chat-input-wrapper:focus-within {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.1);
}

.chat-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 10px 0;
}

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

.chat-char-count {
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.chat-send-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.chat-send-btn:hover {
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.4);
  transform: scale(1.05);
}

.chat-send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.chat-disclaimer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

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

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

  .hero-visual {
    max-width: 500px;
    margin: 0 auto;
  }

  .features-grid,
  .steps-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .steps-grid::before {
    display: none;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0 var(--space-md);
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: var(--space-xl);
    gap: var(--space-lg);
    transform: translateY(-120%);
    transition: transform var(--transition-base);
    z-index: 999;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl);
  }

  .hero-title {
    font-size: 2rem;
  }

  .chat-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    z-index: 100;
  }

  .chat-sidebar.open {
    transform: translateX(0);
  }

  .mobile-sidebar-toggle {
    display: flex;
  }

  .chat-messages {
    padding: var(--space-md);
  }

  .chat-input-area {
    padding: var(--space-md);
  }

  .welcome-suggestions {
    grid-template-columns: 1fr;
  }

  .message {
    max-width: 100%;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}


/* ============================================
   V2 — LOADING OVERLAY & MODEL UI
   ============================================ */

/* ---------- Loading Overlay ---------- */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-content {
  text-align: center;
  max-width: 480px;
  width: 90%;
  animation: fadeInUp 0.6s ease;
}

.loading-logo {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-xl);
  animation: glowPulse 2s infinite;
}

.loading-logo img {
  width: 50px;
  height: 50px;
  object-fit: contain;
}

.loading-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.loading-stage {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: var(--space-xl);
  min-height: 1.5em;
}

/* Progress Bar */
.progress-container {
  width: 100%;
  height: 6px;
  background: rgba(124, 58, 237, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-md);
  position: relative;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4));
  animation: progressShine 1.5s infinite;
}

@keyframes progressShine {
  0% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

.progress-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.loading-tip {
  margin-top: var(--space-xl);
  padding: 14px 18px;
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--accent-cyan-light);
}

/* ---------- WebGPU Warning ---------- */
.webgpu-warning {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.webgpu-warning-content {
  text-align: center;
  max-width: 500px;
  width: 90%;
  padding: var(--space-2xl);
}

.webgpu-warning-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
}

.webgpu-warning-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: #fbbf24;
}

.webgpu-warning-text {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.webgpu-warning-browsers {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.webgpu-browser {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.webgpu-browser-icon {
  font-size: 2rem;
  margin-bottom: 6px;
}

/* ---------- Model Selector ---------- */
.model-selector-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.model-selector {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 10px;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 28px;
}

.model-selector:focus {
  border-color: var(--accent-purple);
}

.model-selector option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.model-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  color: #4ade80;
  font-weight: 500;
  font-family: var(--font-mono);
}

.model-badge--loading {
  background: rgba(251, 191, 36, 0.1);
  border-color: rgba(251, 191, 36, 0.2);
  color: #fbbf24;
}

/* ---------- Streaming Cursor ---------- */
@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

.streaming-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent-purple-light);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}

/* ---------- Powered By Badge ---------- */
.powered-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ---------- Generation Stats ---------- */
.gen-stats {
  display: flex;
  gap: var(--space-md);
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.gen-stat {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}


/* ============================================
   EMAIL SIGNUP GATE
   ============================================ */

.signup-gate {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.5s ease;
}

.signup-gate.hidden {
  opacity: 0;
  pointer-events: none;
}

.signup-card {
  max-width: 460px;
  width: 90%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.6s ease;
}

.signup-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
}

.signup-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center top, rgba(124, 58, 237, 0.06), transparent 70%);
  pointer-events: none;
}

.signup-logo {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-xl);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
  animation: glowPulse 2s infinite;
  position: relative;
  z-index: 1;
}

.signup-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.signup-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.signup-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
  position: relative;
  z-index: 1;
}

.signup-form {
  position: relative;
  z-index: 1;
}

.signup-input-group {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.signup-email-input {
  flex: 1;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.signup-email-input:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.1);
}

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

.signup-submit-btn {
  padding: 14px 28px;
  background: var(--accent-gradient);
  color: white;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.signup-submit-btn:hover {
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.4);
  transform: translateY(-1px);
}

.signup-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.signup-error {
  color: #ef4444;
  font-size: 0.82rem;
  margin-bottom: var(--space-md);
  min-height: 1.2em;
}

.signup-trust {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
  position: relative;
  z-index: 1;
}

.signup-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.signup-trust-icon {
  font-size: 1rem;
}

.signup-footer {
  margin-top: var(--space-xl);
  font-size: 0.78rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}

.signup-footer a {
  color: var(--accent-purple-light);
}

/* User pill (shown in sidebar after signup) */
.user-pill {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 12px;
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.12);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-pill-icon {
  font-size: 0.9rem;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .signup-input-group {
    flex-direction: column;
  }

  .signup-trust {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }
}