/* ==========================================================================
   EC Chat Agent — Landing Page Styles
   Design: spell.sh inspired dark theme with blue glow accents
   ========================================================================== */

/* --- CSS Custom Properties --- */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --max-width: 1100px;
  --transition: 150ms ease-out;
  --color-primary: #1677FF;
  --color-primary-muted: #1462D6;
  --color-accent: #69B2FF;
}

/* --- Dark Theme (default) --- */
:root, [data-theme="dark"] {
  --color-bg: #09090b;
  --color-bg-subtle: #111113;
  --color-surface: #18181b;
  --color-surface-hover: #1f1f23;
  --color-border: #27272a;
  --color-border-subtle: #1e1e21;
  --color-text: #fafafa;
  --color-text-muted: #a1a1aa;
  --color-text-subtle: #71717a;
  --color-glow: rgba(22, 119, 255, 0.15);
  --color-glow-strong: rgba(22, 119, 255, 0.3);
  --nav-bg: rgba(9, 9, 11, 0.8);
  --hero-h1-gradient: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
  --code-kw: #c084fc;
  --code-str: #4ade80;
  --code-fn: #60a5fa;
  --code-cm: #525259;
  --code-tag: #f87171;
  --code-attr: #fbbf24;
  --dot-color: rgba(255, 255, 255, 0.03);
  --method-get-bg: rgba(34, 197, 94, 0.12);
  --method-get-fg: #4ade80;
  --method-post-bg: rgba(59, 130, 246, 0.12);
  --method-post-fg: #60a5fa;
  --method-delete-bg: rgba(239, 68, 68, 0.12);
  --method-delete-fg: #f87171;
}

/* --- Light Theme --- */
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-subtle: #f8f9fb;
  --color-surface: #f1f3f5;
  --color-surface-hover: #e9ecef;
  --color-border: #d1d5db;
  --color-border-subtle: #e5e7eb;
  --color-text: #111113;
  --color-text-muted: #4b5563;
  --color-text-subtle: #6b7280;
  --color-glow: rgba(22, 119, 255, 0.08);
  --color-glow-strong: rgba(22, 119, 255, 0.15);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --hero-h1-gradient: linear-gradient(135deg, #111113 0%, #4b5563 100%);
  --code-kw: #7c3aed;
  --code-str: #16a34a;
  --code-fn: #2563eb;
  --code-cm: #9ca3af;
  --code-tag: #dc2626;
  --code-attr: #d97706;
  --dot-color: rgba(0, 0, 0, 0.04);
  --method-get-bg: rgba(34, 197, 94, 0.1);
  --method-get-fg: #16a34a;
  --method-post-bg: rgba(59, 130, 246, 0.1);
  --method-post-fg: #2563eb;
  --method-delete-bg: rgba(239, 68, 68, 0.1);
  --method-delete-fg: #dc2626;
}

/* --- 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-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary); }

code, .mono { font-family: var(--font-mono); }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
}

.nav-logo svg { width: 28px; height: 28px; }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 13px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  margin-left: 8px;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-subtle);
}

.theme-toggle svg { width: 16px; height: 16px; }

/* Show/hide icons based on theme */
[data-theme="dark"] .icon-light,
:root:not([data-theme="light"]) .icon-light { display: none; }
[data-theme="dark"] .icon-dark,
:root:not([data-theme="light"]) .icon-dark { display: block; }
[data-theme="light"] .icon-dark { display: none; }
[data-theme="light"] .icon-light { display: block; }

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

/* --- Sections shared --- */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 96px 24px;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 16px;
  max-width: 600px;
  margin-bottom: 48px;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--color-glow-strong) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 20%, rgba(105, 178, 255, 0.08) 0%, transparent 60%),
    var(--color-bg);
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot-color) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(22, 119, 255, 0.1);
  border: 1px solid rgba(22, 119, 255, 0.2);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  background: var(--hero-h1-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: clamp(16px, 2.5vw, 19px);
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 0 20px rgba(22, 119, 255, 0.3);
}

.btn-primary:hover {
  background: #1a85ff;
  box-shadow: 0 0 30px rgba(22, 119, 255, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-text-subtle);
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  position: relative;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius);
  transition: all 300ms ease;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity 300ms ease;
}

.feature-card:hover {
  border-color: var(--color-border);
  background: var(--color-surface-hover);
  transform: translateY(-2px);
}

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

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(22, 119, 255, 0.1);
  color: var(--color-primary);
  margin-bottom: 16px;
  font-size: 20px;
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Architecture / Tech Stack --- */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.arch-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

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

.arch-label {
  font-size: 11px;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.arch-value {
  font-size: 14px;
  font-weight: 500;
}

/* --- API Table --- */
.api-section { overflow-x: auto; }

.api-group { margin-bottom: 32px; }

.api-group-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.api-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.api-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-subtle);
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.api-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border-subtle);
  vertical-align: middle;
}

.api-table tr:last-child td { border-bottom: none; }

.api-table tr:hover td { background: var(--color-surface); }

.api-path {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text);
}

.api-desc { color: var(--color-text-muted); }

/* Method badges */
.method {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 4px;
  min-width: 52px;
  text-align: center;
}

.method-get { background: var(--method-get-bg); color: var(--method-get-fg); }
.method-post { background: var(--method-post-bg); color: var(--method-post-fg); }
.method-delete { background: var(--method-delete-bg); color: var(--method-delete-fg); }

.auth-badge {
  font-size: 11px;
  color: var(--color-text-subtle);
}

.auth-badge.required { color: var(--color-accent); }

/* --- Demo Section --- */
.demo-section {
  position: relative;
}

.demo-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.demo-info h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.demo-info p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 24px;
  line-height: 1.7;
}

/* Code block */
.code-block {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.code-header span {
  font-size: 12px;
  color: var(--color-text-subtle);
  font-family: var(--font-mono);
}

.code-copy {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.code-copy:hover {
  color: var(--color-text);
  border-color: var(--color-text-subtle);
}

.code-copy.copied {
  color: #4ade80;
  border-color: rgba(34, 197, 94, 0.3);
}

.code-block pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.code-block .kw { color: var(--code-kw); }
.code-block .str { color: var(--code-str); }
.code-block .fn { color: var(--code-fn); }
.code-block .cm { color: var(--code-cm); }
.code-block .tag { color: var(--code-tag); }
.code-block .attr { color: var(--code-attr); }

/* Demo placeholder area */
.demo-widget-area {
  position: relative;
  min-height: 420px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 100%, var(--color-glow) 0%, transparent 60%),
    var(--color-bg-subtle);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.demo-note {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  color: var(--color-text-subtle);
  white-space: nowrap;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: 40px 24px;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-text {
  font-size: 13px;
  color: var(--color-text-subtle);
}

.footer-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-subtle);
  transition: color var(--transition);
}

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

/* --- Divider --- */
.divider {
  height: 1px;
  background: var(--color-border-subtle);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* --- SSE Event type pills --- */
.sse-events {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.sse-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
  .demo-layout { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-inner { padding: 0 16px; }
  .theme-toggle { margin-left: 0; }
  .nav-right { margin-left: auto; }
  .footer-inner { flex-direction: column; gap: 16px; }
  .section { padding: 64px 16px; }
  .hero { min-height: 80vh; }
}

@media (max-width: 1024px) and (min-width: 769px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- Scroll reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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