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

:root {
  --bg: #faf6f1;
  --bg-alt: #fefcf9;
  --surface: rgba(255,253,250,0.6);
  --border: rgba(160,130,100,0.1);
  --text: #3d3229;
  --text-muted: #8a7b6b;
  --accent: #b8865a;
  --accent2: #c9976b;
  --accent3: #d4a87c;
  --gradient: linear-gradient(135deg, #d4a87c, #c49068, #b87d55, #a66d45);
  --gradient-soft: linear-gradient(135deg, rgba(212,168,124,0.18), rgba(196,144,104,0.12), rgba(184,125,85,0.08));
  --gradient-nav: linear-gradient(135deg, rgba(212,168,124,0.25), rgba(196,144,104,0.18), rgba(184,125,85,0.12));
  --glass: rgba(255,253,250,0.6);
  --glass-border: rgba(255,250,240,0.8);
  --shadow: 0 2px 20px rgba(184,134,90,0.08);
  --shadow-hover: 0 8px 32px rgba(184,134,90,0.14);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.7; overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent2); }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* === Gradient text === */
.gradient-text {
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}

/* === Orbs === */
.orb {
  position: fixed; border-radius: 50%; pointer-events: none; z-index: -1;
  filter: blur(90px); opacity: 0.35; animation: orbFloat 25s ease-in-out infinite;
}
.orb-1 { width: 450px; height: 450px; background: rgba(212,168,124,0.35); top: 5%; left: -8%; }
.orb-2 { width: 380px; height: 380px; background: rgba(196,144,104,0.28); top: 55%; right: -6%; animation-delay: -8s; }
.orb-3 { width: 320px; height: 320px; background: rgba(184,125,85,0.22); bottom: 5%; left: 25%; animation-delay: -16s; }
.orb-4 { width: 280px; height: 280px; background: rgba(212,168,124,0.18); top: 35%; right: 20%; animation-delay: -12s; }
@keyframes orbFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(30px,-25px) scale(1.05); }
  66% { transform: translate(-20px,30px) scale(0.95); }
}

/* === Navbar === */
.navbar {
  position: fixed; top: 12px; left: 50%; transform: translateX(-50%); z-index: 100;
  width: calc(100% - 48px); max-width: 1100px;
  padding: 12px 28px;
  background: var(--gradient-nav);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 16px; border: 1px solid var(--glass-border);
  box-shadow: 0 4px 24px rgba(184,134,90,0.1);
  transition: all 0.3s;
}
.navbar.scrolled { box-shadow: 0 4px 32px rgba(184,134,90,0.15); }
.nav-container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-weight: 700; font-size: 1.15rem; color: var(--text); display: flex; align-items: center; gap: 6px; }
.logo-icon { font-size: 1.2rem; }
.nav-links { list-style: none; display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  background: var(--gradient); color: #fff !important; padding: 8px 20px;
  border-radius: 10px; font-weight: 600; font-size: 0.85rem !important;
}
.nav-cta:hover { opacity: 0.9; color: #fff !important; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; transition: all 0.3s; }
.lang-btn {
  background: var(--gradient); color: #fff; border: none; padding: 6px 16px;
  border-radius: 10px; font-size: 0.82rem; font-weight: 700; cursor: pointer;
  transition: all 0.3s; letter-spacing: 0.5px;
}
.lang-btn:hover { opacity: 0.85; transform: translateY(-1px); }

/* === Hero === */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; padding: 120px 24px 60px; text-align: center;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 25% 40%, rgba(212,168,124,0.25) 0%, transparent 50%),
    radial-gradient(ellipse at 75% 30%, rgba(196,144,104,0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 85%, rgba(184,125,85,0.15) 0%, transparent 50%);
}
.hero-content { position: relative; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block; padding: 8px 20px; border-radius: 24px;
  background: var(--glass); border: 1px solid var(--border);
  backdrop-filter: blur(8px); font-size: 0.85rem; color: var(--text-muted);
  margin-bottom: 24px; font-weight: 500;
}
.hero h1 { font-size: clamp(2.2rem, 5.5vw, 3.5rem); font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero-desc { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto 32px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; margin-bottom: 56px; flex-wrap: wrap; }

.btn {
  padding: 14px 32px; border-radius: 12px; font-size: 0.95rem; font-weight: 600;
  transition: all 0.3s; cursor: pointer; display: inline-block; border: none;
}
.btn-primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 4px 16px rgba(184,134,90,0.2);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(184,134,90,0.25); color: #fff; }
.btn-glass {
  background: var(--glass); border: 1.5px solid var(--border);
  color: var(--text); backdrop-filter: blur(8px);
}
.btn-glass:hover { border-color: var(--accent3); color: var(--accent); }
.btn-lg { padding: 16px 40px; font-size: 1.05rem; }

/* === Hero Mockup === */
.hero-mockup { perspective: 1000px; }
.mockup-window {
  background: var(--glass); border: 1px solid var(--border);
  border-radius: 16px; overflow: hidden; box-shadow: var(--shadow-hover);
  backdrop-filter: blur(16px); text-align: left;
  transform: rotateX(4deg); transition: transform 0.5s;
}
.mockup-window:hover { transform: rotateX(0deg); }
.mockup-topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px; border-bottom: 1px solid var(--border); background: rgba(255,255,255,0.4);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }
.mockup-title { margin-left: 12px; font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }
.mockup-body { display: flex; min-height: 200px; }
.mockup-sidebar {
  width: 160px; padding: 16px; border-right: 1px solid var(--border);
  background: rgba(255,255,255,0.3);
}
.mockup-nav-item {
  padding: 8px 12px; border-radius: 8px; font-size: 0.8rem;
  color: var(--text-muted); margin-bottom: 4px; cursor: default;
}
.mockup-nav-item.active { background: rgba(212,168,124,0.15); color: var(--accent); font-weight: 600; }
.mockup-main { flex: 1; padding: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-content: start; }
.mockup-card {
  background: rgba(255,255,255,0.5); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px;
}
.mockup-card-header { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; margin-bottom: 8px; }
.mockup-stat { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.mockup-btn {
  display: inline-block; padding: 6px 14px; border-radius: 8px;
  background: var(--gradient); color: #fff; font-size: 0.75rem; font-weight: 600;
}
.mockup-progress { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.mockup-progress-bar { height: 100%; width: 65%; background: var(--gradient); border-radius: 3px; }

/* === Sections === */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-badge {
  display: inline-block; padding: 6px 16px; border-radius: 20px;
  background: rgba(212,168,124,0.12); color: var(--accent);
  font-size: 0.8rem; font-weight: 600; margin-bottom: 16px; letter-spacing: 0.5px;
}
.section-header h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 800; margin-bottom: 12px; }
.section-desc { color: var(--text-muted); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* === Features === */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.feature-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: 16px;
  padding: 28px; backdrop-filter: blur(12px); box-shadow: var(--shadow);
  transition: all 0.3s;
}
.feature-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.feature-card.large { grid-column: span 3; }
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); }

/* Feature visual: analysis blocks */
.feature-visual { margin-top: 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.analysis-block {
  background: rgba(255,255,255,0.5); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px; font-size: 0.8rem;
}
.analysis-label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; margin-bottom: 6px; color: var(--text-muted);
}
.analysis-label.accent { color: var(--accent); }
.analysis-label.success { color: #28a745; }
.analysis-text { color: var(--text); font-size: 0.82rem; line-height: 1.5; }
.analysis-text.dim { color: var(--text-muted); }

/* FSRS visual */
.fsrs-visual {
  display: flex; align-items: center; gap: 8px; margin-top: 16px;
  padding: 12px; background: rgba(255,255,255,0.4); border-radius: 10px;
}
.fsrs-day {
  padding: 6px 14px; border-radius: 8px; font-size: 0.8rem; font-weight: 600;
  background: var(--gradient); color: #fff;
}
.fsrs-day.faded { opacity: 0.4; }
.fsrs-arrow { color: var(--text-muted); font-size: 0.8rem; }

/* === Steps === */
.steps { max-width: 700px; margin: 0 auto; }
.step {
  display: flex; gap: 24px; align-items: flex-start;
  background: var(--glass); border: 1px solid var(--border); border-radius: 16px;
  padding: 28px; backdrop-filter: blur(12px); box-shadow: var(--shadow);
  transition: all 0.3s;
}
.step:hover { box-shadow: var(--shadow-hover); }
.step-number {
  font-size: 2rem; font-weight: 800; min-width: 60px;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.step-content h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.step-content p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 12px; }
.step-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.step-tags span {
  padding: 4px 10px; border-radius: 8px; font-size: 0.75rem;
  background: rgba(212,168,124,0.12); color: var(--accent); font-weight: 500;
}
.step-connector {
  width: 2px; height: 32px; margin: 0 auto;
  background: linear-gradient(to bottom, var(--accent3), transparent);
}

/* === Tasks === */
.tasks-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.task-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: 16px;
  padding: 28px; backdrop-filter: blur(12px); box-shadow: var(--shadow);
  transition: all 0.3s;
}
.task-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.task-card.featured { border-color: rgba(212,168,124,0.35); background: linear-gradient(135deg, rgba(212,168,124,0.08), rgba(196,144,104,0.05)); }
.task-header { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.task-type {
  padding: 4px 10px; border-radius: 8px; font-size: 0.75rem; font-weight: 700;
  background: var(--gradient); color: #fff;
}
.task-label { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.task-card > p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 16px; }
.task-structure { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.task-structure span {
  padding: 4px 10px; border-radius: 6px; font-size: 0.72rem;
  background: rgba(212,168,124,0.1); color: var(--accent); font-weight: 500;
}
.task-word { font-size: 0.8rem; color: var(--text-muted); font-weight: 600; }

/* === Tech === */
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.tech-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: 14px;
  padding: 24px; text-align: center; backdrop-filter: blur(12px);
  box-shadow: var(--shadow); transition: all 0.3s;
}
.tech-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.tech-icon { font-size: 1.8rem; margin-bottom: 8px; }
.tech-card h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.tech-card p { font-size: 0.78rem; color: var(--text-muted); }

/* === Pricing === */
.pricing-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 700px; margin: 0 auto; }
.pricing-card {
  background: var(--glass); border: 1px solid var(--border); border-radius: 16px;
  padding: 36px; backdrop-filter: blur(12px); box-shadow: var(--shadow);
  text-align: center; position: relative; transition: all 0.3s;
}
.pricing-card:hover { box-shadow: var(--shadow-hover); }
.pricing-card.popular {
  border-color: rgba(212,168,124,0.35);
  background: linear-gradient(135deg, rgba(212,168,124,0.08), rgba(196,144,104,0.05));
}
.popular-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--gradient); color: #fff; font-size: 0.72rem; font-weight: 700;
  padding: 4px 14px; border-radius: 12px; text-transform: uppercase; letter-spacing: 0.5px;
}
.pricing-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.price { font-size: 2.5rem; font-weight: 800; margin-bottom: 20px; }
.price span { font-size: 0.9rem; font-weight: 400; color: var(--text-muted); }
.pricing-card ul { list-style: none; text-align: left; margin-bottom: 24px; }
.pricing-card li { padding: 6px 0; font-size: 0.88rem; color: var(--text-muted); }
.pricing-card .btn { width: 100%; text-align: center; }

/* === CTA === */
.section-cta {
  background: var(--gradient-soft); text-align: center;
}
.cta-content h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 800; margin-bottom: 12px; }
.cta-content p { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 28px; }
.cta-actions { margin-bottom: 16px; }
.cta-note { font-size: 0.8rem; color: var(--text-muted); }

/* === Footer === */
.footer { padding: 48px 0 32px; border-top: 1px solid var(--border); }
.footer-grid { display: flex; justify-content: space-between; align-items: start; margin-bottom: 32px; flex-wrap: wrap; gap: 24px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--border); }
.footer-bottom p { font-size: 0.8rem; color: var(--text-muted); }

/* === Animations === */
.fade-in { opacity: 0; transform: translateY(24px); transition: all 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* === Responsive === */
@media (max-width: 900px) {
  .features-grid { grid-template-columns: 1fr; }
  .feature-card.large { grid-column: span 1; }
  .feature-visual { grid-template-columns: 1fr 1fr; }
  .tasks-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .navbar { width: calc(100% - 32px); padding: 10px 20px; top: 8px; }
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 260px; height: 100vh;
    background: rgba(250,246,241,0.95); backdrop-filter: blur(20px);
    flex-direction: column; padding: 80px 32px; gap: 24px;
    transition: right 0.3s; border-left: 1px solid var(--border);
  }
  .nav-links.active { right: 0; }
  .nav-cta { text-align: center; }
  .hero { padding: 100px 24px 60px; }
  .mockup-sidebar { display: none; }
  .mockup-main { grid-template-columns: 1fr; }
  .feature-visual { grid-template-columns: 1fr; }
  .step { flex-direction: column; gap: 12px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { flex-direction: column; }
}