/* ============================================================
   COUPLE DECIDE — Design System
   Colors, typography, layout, components, dark mode, responsive
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* --- CSS Variables (Light Mode) --- */
:root {
  --primary: #E11D48;
  --primary-glow: #F43F5E;
  --primary-hover: #be123c;
  --secondary: #EC4899;
  --accent-purple: #A855F7;
  --accent-teal: #2DD4BF;
  --accent-orange: #F97316;
  --accent-indigo: #4338CA;

  --bg: #f8f9fc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --scrollbar: #cbd5e1;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --shadow-neon: 0 0 15px rgba(225,29,72,0.4), 0 0 30px rgba(225,29,72,0.15);
  --shadow-wheel: 0 0 20px rgba(168,85,247,0.3);

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-pill: 9999px;

  --font: 'Plus Jakarta Sans', sans-serif;
  --transition: 0.2s ease;
}

/* --- Dark Mode Variables --- */
.dark {
  --bg: #0F172A;
  --surface: #1E293B;
  --surface-2: #334155;
  --border: #334155;
  --text: #F8FAFC;
  --text-muted: #94A3B8;
  --scrollbar: #475569;
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 20px; }

/* --- Typography --- */
h1 { font-size: 2.25rem; font-weight: 800; line-height: 1.2; }
h2 { font-size: 1.625rem; font-weight: 700; line-height: 1.3; }
h3 { font-size: 1.2rem; font-weight: 600; }
p  { color: var(--text-muted); }
a  { color: var(--primary); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

/* --- Container --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.875rem 1.5rem;
  max-width: 1200px; margin: 0 auto;
}
.logo {
  display: flex; align-items: center; gap: 0.5rem;
  font-weight: 800; font-size: 1.1rem; color: var(--text);
  text-decoration: none;
}
.logo-icon { font-size: 1.4rem; }
.logo span { background: linear-gradient(135deg, var(--primary), var(--accent-purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.header-nav { display: flex; gap: 0.25rem; margin-left: 1.5rem; }
.nav-link {
  padding: 0.4rem 0.9rem; border-radius: var(--radius-pill);
  font-size: 0.875rem; font-weight: 500; color: var(--text-muted);
  transition: all var(--transition); text-decoration: none;
}
.nav-link:hover, .nav-link.active { background: var(--surface-2); color: var(--text); opacity: 1; }
.header-actions { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; }
.icon-btn {
  width: 36px; height: 36px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); background: var(--surface-2);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: var(--text); transition: all var(--transition);
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); }
.lang-btn { font-weight: 700; font-size: 0.8rem; width: auto; padding: 0 0.75rem; }

/* ============================================================
   AD SLOTS
   ============================================================ */
.ad-slot {
  background: var(--surface-2);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.8rem;
  font-style: italic; overflow: hidden;
}
.ad-top { width: 100%; min-height: 90px; margin: 1rem 0; }
.ad-side { width: 100%; min-height: 250px; margin: 1rem 0; }
.ad-bottom { width: 100%; min-height: 90px; margin: 2rem 0; }

/* ============================================================
   MAIN WHEEL PAGE LAYOUT
   ============================================================ */
.wheel-page-main { padding: 1.5rem 0; }
.wheel-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 2rem;
  align-items: start;
}

/* --- Wheel Column --- */
.wheel-column { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; }

.category-select-wrap { width: 100%; max-width: 420px; }
.category-select-wrap label { display: block; font-weight: 600; font-size: 0.875rem; margin-bottom: 0.5rem; }
.category-select {
  width: 100%; padding: 0.625rem 1rem;
  border: 1px solid var(--border); border-radius: var(--radius-md);
  background: var(--surface); color: var(--text);
  font-family: var(--font); font-size: 0.95rem; font-weight: 500;
  cursor: pointer; transition: border-color var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.75rem center;
  padding-right: 2.5rem;
}
.category-select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(225,29,72,0.1); }

.wheel-container {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 1rem;
}
.wheel-canvas-wrap {
  position: relative;
  filter: drop-shadow(var(--shadow-wheel));
  transition: filter var(--transition);
}
.wheel-canvas-wrap:hover { filter: drop-shadow(0 0 25px rgba(168,85,247,0.5)); }
#wheelCanvas { display: block; border-radius: 50%; }
.wheel-pointer {
  position: absolute; top: -16px; left: 50%; transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 14px solid transparent;
  border-right: 14px solid transparent;
  border-top: 28px solid var(--primary);
  filter: drop-shadow(0 2px 4px rgba(225,29,72,0.6));
  z-index: 10;
}

.spin-btn {
  padding: 0.9rem 2.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  color: white; border: none; border-radius: var(--radius-pill);
  font-family: var(--font); font-size: 1.1rem; font-weight: 700;
  cursor: pointer; transition: all 0.3s ease;
  box-shadow: var(--shadow-neon);
  letter-spacing: 0.02em;
}
.spin-btn:hover { transform: translateY(-2px); box-shadow: 0 0 20px rgba(225,29,72,0.6), 0 0 40px rgba(225,29,72,0.2); }
.spin-btn:active { transform: translateY(0); }
.spin-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.spin-hint { font-size: 0.8rem; color: var(--text-muted); text-align: center; }

/* --- Options Panel --- */
.options-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  display: flex; flex-direction: column; gap: 1rem;
}
.options-panel h3 { font-size: 1rem; font-weight: 700; }
.options-count { font-size: 0.8rem; color: var(--text-muted); font-weight: 400; }

.options-list { display: flex; flex-direction: column; gap: 0.375rem; max-height: 320px; overflow-y: auto; padding-right: 4px; }

.option-item {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--surface-2);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: border-color var(--transition);
}
.option-item:hover { border-color: var(--border); }
.option-color-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.option-text { flex: 1; font-size: 0.875rem; font-weight: 500; }
.option-delete {
  width: 26px; height: 26px; border-radius: var(--radius-sm);
  border: none; background: transparent; cursor: pointer;
  color: var(--text-muted); font-size: 1rem; display: flex; align-items: center; justify-content: center;
  transition: all var(--transition); flex-shrink: 0;
}
.option-delete:hover { background: #fee2e2; color: #ef4444; }
.dark .option-delete:hover { background: rgba(239,68,68,0.15); }

.add-option-wrap { display: flex; gap: 0.5rem; }
.add-input {
  flex: 1; padding: 0.5rem 0.75rem;
  border: 1px solid var(--border); border-radius: var(--radius-md);
  background: var(--surface-2); color: var(--text);
  font-family: var(--font); font-size: 0.875rem;
  transition: border-color var(--transition);
}
.add-input:focus { outline: none; border-color: var(--primary); }
.add-input::placeholder { color: var(--text-muted); }
.add-btn {
  padding: 0.5rem 1rem;
  background: var(--primary); color: white;
  border: none; border-radius: var(--radius-md);
  font-family: var(--font); font-size: 0.875rem; font-weight: 600;
  cursor: pointer; transition: background var(--transition);
  white-space: nowrap;
}
.add-btn:hover { background: var(--primary-hover); }

.reset-btn {
  width: 100%; padding: 0.5rem;
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  font-family: var(--font); font-size: 0.8rem; font-weight: 500;
  cursor: pointer; transition: all var(--transition);
}
.reset-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(225,29,72,0.04); }

/* ============================================================
   RESULT MODAL
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  opacity: 0; visibility: hidden; transition: all 0.3s ease;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 420px; width: 100%;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9); transition: transform 0.3s ease;
}
.modal-overlay.active .modal-card { transform: scale(1); }
.modal-emoji { font-size: 3rem; margin-bottom: 0.5rem; }
.modal-label { font-size: 0.875rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.5rem; }
.modal-result {
  font-size: 1.75rem; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 1.5rem; line-height: 1.3;
}
.modal-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.modal-spin-again {
  padding: 0.65rem 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  color: white; border: none; border-radius: var(--radius-pill);
  font-family: var(--font); font-size: 0.9rem; font-weight: 700;
  cursor: pointer; transition: opacity var(--transition);
}
.modal-spin-again:hover { opacity: 0.9; }
.modal-close {
  padding: 0.65rem 1.5rem;
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  font-family: var(--font); font-size: 0.9rem; font-weight: 500;
  cursor: pointer; transition: all var(--transition);
}
.modal-close:hover { border-color: var(--text-muted); color: var(--text); }

/* ============================================================
   SEO CONTENT SECTION
   ============================================================ */
.seo-section { padding: 3rem 0 1rem; }
.seo-section h1 { margin-bottom: 1rem; }
.seo-section h2 { margin: 2rem 0 0.75rem; font-size: 1.375rem; }
.seo-section p { margin-bottom: 1rem; line-height: 1.75; color: var(--text-muted); }
.seo-section ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.seo-section ul li { color: var(--text-muted); margin-bottom: 0.4rem; }

.faq-llm { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 1.5rem; margin-top: 2rem; }
.faq-llm h2 { margin-bottom: 1rem; font-size: 1.25rem; }
.faq-llm-item { margin-bottom: 1.25rem; }
.faq-llm-item strong { display: block; color: var(--text); font-weight: 600; margin-bottom: 0.35rem; }
.faq-llm-item p { margin: 0; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  margin-top: 2rem;
  text-align: center;
}
.footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
.footer-links a { font-size: 0.875rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--primary); opacity: 1; }
.footer-copy { font-size: 0.8rem; color: var(--text-muted); }

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-hero {
  background: linear-gradient(135deg, #fdf2f8, #f0f0ff);
  padding: 4rem 1.5rem;
  text-align: center;
}
.dark .about-hero { background: linear-gradient(135deg, #1a0a14, #0d0d1f); }
.about-hero h1 { margin-bottom: 1rem; }
.about-hero p { max-width: 600px; margin: 0 auto 1.5rem; font-size: 1.1rem; }

.about-cta {
  display: inline-block; padding: 0.75rem 2rem;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  color: white; border-radius: var(--radius-pill);
  font-weight: 700; font-size: 0.95rem;
  box-shadow: var(--shadow-neon);
}
.about-cta:hover { opacity: 0.9; color: white; }

.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem; padding: 3rem 0;
}
.feature-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.feature-card h3 { margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.9rem; margin: 0; }

.about-text-section { padding: 2rem 0 3rem; max-width: 720px; margin: 0 auto; }
.about-text-section h2 { margin-bottom: 1rem; }
.about-text-section p { margin-bottom: 1rem; }

/* ============================================================
   FAQ PAGE
   ============================================================ */
.faq-hero { padding: 3rem 1.5rem 2rem; text-align: center; }
.faq-hero h1 { margin-bottom: 0.75rem; }

.faq-list { max-width: 720px; margin: 0 auto 3rem; display: flex; flex-direction: column; gap: 0.75rem; }
details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: box-shadow var(--transition);
}
details:hover { box-shadow: var(--shadow-md); }
details[open] { border-color: var(--primary); }
summary {
  padding: 1rem 1.25rem;
  font-weight: 600; font-size: 1rem; color: var(--text);
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  transition: color var(--transition);
}
summary:hover { color: var(--primary); }
summary::after { content: '+'; font-size: 1.25rem; font-weight: 300; flex-shrink: 0; color: var(--text-muted); transition: transform 0.2s ease; }
details[open] summary::after { content: '−'; }
.faq-answer { padding: 0 1.25rem 1rem; color: var(--text-muted); line-height: 1.75; }
.faq-answer a { color: var(--primary); }

/* ============================================================
   HAMBURGER MENU
   ============================================================ */
.hamburger-btn {
  display: none;
  width: 36px; height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface-2);
  cursor: pointer; flex-direction: column;
  align-items: center; justify-content: center; gap: 5px;
  transition: all var(--transition);
}
.hamburger-btn:hover { border-color: var(--primary); }
.hamburger-btn span {
  display: block; width: 16px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: all 0.3s ease;
}
/* Animated X when open */
.hamburger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav dropdown */
.mobile-nav {
  display: none;
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: 0.75rem 1.5rem;
  flex-direction: column; gap: 0.25rem;
  z-index: 99;
}
.mobile-nav.open { display: flex; }
.mobile-nav .nav-link {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}

/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */
@media (max-width: 800px) {
  .wheel-layout { grid-template-columns: 1fr; }
  .options-panel { order: 2; }
  .header-nav { display: none; }
  .hamburger-btn { display: flex; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.375rem; }
  .modal-card { padding: 1.5rem; }
  .modal-result { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  .header-inner { padding: 0.75rem 1rem; }
  .container { padding: 0 1rem; }
  .spin-btn { font-size: 1rem; padding: 0.8rem 2rem; }
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.4s ease forwards; }

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.03); }
}
.spin-btn.spinning { animation: pulse 0.6s ease infinite; }