/* ============================================================
   玄淵 官網樣式 — 水墨仙俠風
   字體：Noto Serif TC（標題）+ Noto Sans TC（內文）
   色彩：米紙 #F2E8D5 / 墨黑 #2A2520 / 金 #B89968
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700&family=Noto+Serif+TC:wght@600;900&display=swap');

:root {
    --paper: #F2E8D5;
    --paper-deep: #E8DCC5;
    --ink-black: #2A2520;
    --ink-dark: #4A3F35;
    --ink-light: #7D6F5E;
    --gold: #B89968;
    --gold-bright: #D4B87A;
    --gold-dark: #8F7A4F;
    --cyan: #5F8A8A;
    --stroke: rgba(42, 37, 32, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--ink-black);
    background: var(--paper);
    line-height: 1.75;
    min-height: 100vh;
}

h1, h2, h3, h4 {
    font-family: 'Noto Serif TC', serif;
    color: var(--ink-black);
    font-weight: 700;
    letter-spacing: 0.04em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); margin-bottom: 0.5em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin: 2em 0 0.8em; border-bottom: 1px solid var(--stroke); padding-bottom: 0.3em; }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); margin: 1.5em 0 0.6em; color: var(--gold-dark); }
h4 { font-size: 1.1rem; margin: 1em 0 0.4em; }

p { margin-bottom: 1em; }
a { color: var(--gold-dark); text-decoration: none; border-bottom: 1px dashed var(--gold); }
a:hover { color: var(--gold-bright); border-bottom-style: solid; }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(242, 232, 213, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--stroke);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    font-family: 'Noto Serif TC', serif;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--ink-black);
    border: none;
    letter-spacing: 0.1em;
}
.nav-links a {
    margin-left: 2rem;
    border: none;
    color: var(--ink-dark);
    font-weight: 500;
}
.nav-links a:hover { color: var(--gold-dark); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}
.hero-text h1 {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 900;
    color: var(--ink-black);
    margin-bottom: 0.3em;
    letter-spacing: 0.2em;
}
.hero-text .tagline {
    color: var(--ink-light);
    font-size: 1.2rem;
    margin-bottom: 1.5em;
    letter-spacing: 0.05em;
}
.hero-text .desc {
    color: var(--ink-dark);
    font-size: 1.05rem;
    margin-bottom: 2em;
}
.hero-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-block;
    padding: 0.9em 1.8em;
    background: var(--gold);
    color: var(--paper);
    font-family: 'Noto Serif TC', serif;
    font-weight: 600;
    letter-spacing: 0.1em;
    border-radius: 4px;
    border: none;
    text-decoration: none;
    margin-right: 0.8em;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 3px 12px rgba(184, 153, 104, 0.3);
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(184, 153, 104, 0.4);
    color: var(--paper);
    border: none;
}
.btn-outline {
    background: transparent;
    color: var(--gold-dark);
    border: 1px solid var(--gold);
    box-shadow: none;
}
.btn-outline:hover { background: var(--gold); color: var(--paper); }

/* ============================================================
   Features
   ============================================================ */
.features {
    max-width: 1100px;
    margin: 5rem auto;
    padding: 0 2rem;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}
.feature-card {
    background: rgba(255, 255, 255, 0.4);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid var(--stroke);
}
.feature-card .icon {
    font-size: 2rem;
    margin-bottom: 0.8em;
}
.feature-card h3 {
    color: var(--ink-black);
    margin: 0.3em 0 0.5em;
}

/* ============================================================
   Doc Page（隱私政策等）
   ============================================================ */
.doc {
    max-width: 800px;
    margin: 3rem auto 6rem;
    padding: 0 2rem;
}
.doc h1 { border-bottom: 2px solid var(--gold); padding-bottom: 0.4em; margin-bottom: 0.5em; }
.doc ul, .doc ol { margin: 0.8em 0 1.2em 1.5em; }
.doc li { margin-bottom: 0.4em; }
.doc table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 4px;
    overflow: hidden;
}
.doc th, .doc td {
    padding: 0.8em 1em;
    text-align: left;
    border-bottom: 1px solid var(--stroke);
}
.doc th {
    background: var(--paper-deep);
    font-weight: 600;
    color: var(--ink-black);
}
.doc hr { border: none; border-top: 1px solid var(--stroke); margin: 2em 0; }
.doc strong { color: var(--ink-black); }
.doc code {
    background: var(--paper-deep);
    padding: 0.1em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: monospace;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
    background: var(--ink-black);
    color: var(--paper);
    padding: 3rem 2rem 2rem;
    margin-top: 6rem;
}
.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
}
.footer h4 { color: var(--gold-bright); margin-bottom: 1em; }
.footer a { color: var(--paper); border: none; font-size: 0.95rem; }
.footer a:hover { color: var(--gold-bright); }
.footer ul { list-style: none; padding: 0; }
.footer li { margin-bottom: 0.5em; }
.footer-bottom {
    max-width: 1100px;
    margin: 2rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--ink-light);
    font-size: 0.85rem;
    text-align: center;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
    .hero { grid-template-columns: 1fr; margin: 2rem auto; }
    .hero-text { text-align: center; }
    .nav { padding: 0.8rem 1rem; }
    .nav-links a { margin-left: 1rem; font-size: 0.9rem; }
    .footer-content { grid-template-columns: 1fr; gap: 2rem; }
}