/* =========================================================
   Design tokens
   ========================================================= */
:root {
    --ink: #202a20;
    --ink-soft: #3a463a;
    --ink-faint: #6b756a;
    --paper: #f7f1e6;
    --paper-deep: #efe3cd;
    --white: #fffdf8;
    --clay: #b05a3a;
    --clay-deep: #8c4429;
    --line: rgba(32, 42, 32, 0.16);
    --line-strong: rgba(32, 42, 32, 0.32);
    --shadow-soft: 0 20px 60px rgba(32, 42, 32, 0.12);
    --serif: 'Fraunces', 'Noto Serif TC', serif;
    --sans: 'Inter', 'Noto Sans TC', -apple-system, sans-serif;
    --measure: 640px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--sans);
    color: var(--ink-soft);
    background: var(--paper);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 500; color: var(--ink); }

a { color: inherit; }

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

/* =========================================================
   Scroll progress hairline
   ========================================================= */
.progress-rail {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    width: 100%;
    background: transparent;
    z-index: 300;
}
.progress-rail::after {
    content: '';
    display: block;
    height: 100%;
    width: var(--scroll-progress, 0%);
    background: var(--clay);
    transition: width 0.1s linear;
}

/* =========================================================
   Navigation
   ========================================================= */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 28px 48px;
    color: var(--white);
    border-bottom: 1px solid transparent;
    transition: background 0.5s ease, border-color 0.5s ease, padding 0.4s ease, color 0.4s ease;
}

.nav.is-scrolled {
    background: rgba(247, 241, 230, 0.92);
    backdrop-filter: blur(10px);
    border-bottom-color: var(--line);
    padding: 16px 48px;
    color: var(--ink);
}

.nav-mark {
    font-family: var(--serif);
    font-size: 20px;
    letter-spacing: 0.08em;
    font-style: italic;
}

.nav-chapters {
    display: flex;
    list-style: none;
    gap: 34px;
}

.nav-chapters a {
    text-decoration: none;
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    display: flex;
    align-items: baseline;
    gap: 6px;
    position: relative;
    padding-bottom: 4px;
}

.nav-chapters a .chapter-index {
    font-family: var(--serif);
    font-style: italic;
    opacity: 0.6;
    font-size: 12px;
}

.nav-chapters a::after {
    content: '';
    position: absolute;
    left: 0; bottom: 0;
    height: 1px;
    width: 0;
    background: currentColor;
    transition: width 0.35s ease;
}

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

/* =========================================================
   Hero
   ========================================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    background-image:
        linear-gradient(180deg, rgba(20, 27, 20, 0.42) 0%, rgba(20, 27, 20, 0.34) 45%, rgba(20, 27, 20, 0.62) 100%),
        linear-gradient(rgba(32, 42, 32, 0.55), rgba(32, 42, 32, 0.55)),
        url('assets/scene-hero.jpg');
    background-blend-mode: normal, color, normal;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    padding: 140px 24px 80px;
}

@media (hover: none) and (pointer: coarse) {
    .hero, .divider-scene { background-attachment: scroll; }
}

.hero-eyebrow {
    font-size: 12px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    opacity: 0.82;
    margin-bottom: 26px;
}

.hero-names {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 500;
    font-size: clamp(48px, 9vw, 108px);
    line-height: 1.05;
    letter-spacing: 0.01em;
    /* h1 素色預設是 --ink（給紙色底的區塊標題用），這裡在深色 hero 上要強制覆蓋回白色 */
    color: var(--white);
}

.hero-date {
    margin-top: 22px;
    font-size: 13px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    opacity: 0.9;
}

.hero-rule {
    width: 48px;
    height: 1px;
    background: rgba(255, 255, 255, 0.55);
    margin: 34px auto;
}

/* Countdown — typographic ledger, no cards */
.ledger {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0;
    font-variant-numeric: tabular-nums;
}

.ledger-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 18px;
}

.ledger-cell + .ledger-cell {
    border-left: 1px solid rgba(255, 255, 255, 0.28);
}

.ledger-value {
    font-family: var(--serif);
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1;
}

.ledger-label {
    margin-top: 10px;
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    opacity: 0.7;
}

.hero-scroll-cue {
    position: absolute;
    bottom: 34px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    opacity: 0.75;
}

.hero-scroll-cue .cue-line {
    width: 1px;
    height: 34px;
    background: rgba(255, 255, 255, 0.6);
    overflow: hidden;
    position: relative;
}

.hero-scroll-cue .cue-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white);
    animation: cueDrop 2.2s ease-in-out infinite;
}

@keyframes cueDrop {
    0% { top: -100%; }
    60% { top: 100%; }
    100% { top: 100%; }
}

/* =========================================================
   Section shell
   ========================================================= */
.chapter {
    padding: clamp(90px, 14vw, 160px) 24px;
    scroll-margin-top: 96px;
}

.chapter-inner { max-width: 980px; margin: 0 auto; }

.chapter-heading {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 56px;
}

.chapter-heading .chapter-index {
    font-family: var(--serif);
    font-style: italic;
    font-size: 15px;
    color: var(--clay);
}

.chapter-heading .chapter-rule {
    flex: 1;
    height: 1px;
    background: var(--line-strong);
}

.chapter-heading h2 {
    font-size: clamp(30px, 4vw, 44px);
    font-style: italic;
    white-space: nowrap;
}

/* reveal-on-scroll: fade + drawn rule, distinct from plain fade */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.reveal-rule {
    width: 0;
    height: 1px;
    background: var(--clay);
    transition: width 1s ease 0.15s;
}
.reveal.is-visible .reveal-rule { width: 100%; }

/* =========================================================
   Story — editorial two-column with drop cap
   ========================================================= */
.story-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    align-items: start;
}

.story-text { max-width: var(--measure); }

.story-text p { font-size: 16px; margin-bottom: 18px; }

.story-text p.lede::first-letter {
    font-family: var(--serif);
    font-style: italic;
    font-size: 64px;
    float: left;
    line-height: 0.8;
    padding: 8px 10px 0 0;
    color: var(--clay);
}

.story-signoff {
    margin-top: 32px;
    font-family: var(--serif);
    font-style: italic;
    font-size: 22px;
    color: var(--ink);
}

.monogram {
    justify-self: center;
    width: 132px;
    height: 132px;
    border: 1px solid var(--line-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--serif);
    font-style: italic;
    font-size: 30px;
    color: var(--clay);
    letter-spacing: 0.05em;
}

@media (min-width: 860px) {
    .story-grid { grid-template-columns: 1fr auto; }
}

/* =========================================================
   Divider scene
   ========================================================= */
.divider-scene {
    position: relative;
    min-height: 52vh;
    background-image:
        linear-gradient(180deg, rgba(24, 31, 22, 0.5), rgba(24, 31, 22, 0.5)),
        url('assets/scene-divider.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
}

.divider-frame {
    border: 1px solid rgba(255, 255, 255, 0.55);
    padding: 34px 46px;
    text-align: center;
    color: var(--white);
}

.divider-frame p {
    font-family: var(--serif);
    font-style: italic;
    font-size: clamp(20px, 3vw, 30px);
    letter-spacing: 0.02em;
}

.divider-frame span {
    display: block;
    margin-top: 14px;
    font-size: 10px;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    opacity: 0.75;
}

/* =========================================================
   Details — itinerary
   ========================================================= */
.itinerary {
    display: grid;
    grid-template-columns: 1fr;
    gap: 36px 56px;
}

@media (min-width: 700px) {
    .itinerary { grid-template-columns: 1fr 1fr; }
}

.itinerary-item {
    padding-left: 22px;
    border-left: 1px solid var(--line-strong);
}

.itinerary-item dt {
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 10px;
}

.itinerary-item dd {
    font-family: var(--serif);
    font-size: 22px;
    line-height: 1.4;
    color: var(--ink);
}

.gallery-note {
    margin: 56px 0 20px;
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-faint);
    text-align: center;
}

.gallery {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 700px) {
    .gallery { grid-template-columns: 1fr 1fr; }
}

.gallery figure {
    border: 1px solid var(--line);
    background: var(--white);
    padding: 10px;
}

.gallery figcaption {
    padding: 12px 6px 4px;
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-faint);
    text-align: center;
}

/* =========================================================
   RSVP — reply card
   ========================================================= */
.reply-card {
    position: relative;
    max-width: 560px;
    margin: 0 auto;
    background: var(--white);
    border: 1px solid var(--line-strong);
    box-shadow: var(--shadow-soft);
    padding: clamp(36px, 6vw, 64px);
}

.reply-card::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    border-style: solid;
    border-width: 0 34px 34px 0;
    border-color: transparent var(--paper-deep) transparent transparent;
}

.rsvp-intro {
    text-align: center;
    font-size: 14px;
    color: var(--ink-faint);
    margin-bottom: 36px;
}

.field {
    margin-bottom: 26px;
}

.field label {
    display: block;
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-faint);
    margin-bottom: 10px;
}

.field input[type="text"],
.field input[type="tel"],
.field input[type="email"],
.field input[type="number"],
.field input[type="password"],
.field select,
.field textarea {
    width: 100%;
    border: none;
    border-bottom: 1px solid var(--line-strong);
    background: transparent;
    font: inherit;
    font-size: 16px;
    color: var(--ink);
    padding: 8px 2px;
    border-radius: 0;
    transition: border-color 0.3s ease;
    resize: vertical;
}

.field select { appearance: none; -webkit-appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b756a' stroke-width='1.4' fill='none' fill-rule='evenodd'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 4px center; padding-right: 20px; }

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--clay);
}

.field input:disabled, .field select:disabled { opacity: 0.4; }

.stepper {
    display: inline-flex;
    align-items: center;
    gap: 22px;
}

.stepper-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--line-strong);
    background: transparent;
    border-radius: 50%;
    font-size: 15px;
    line-height: 1;
    cursor: pointer;
    color: var(--ink);
    transition: border-color 0.3s ease, color 0.3s ease;
}

.stepper-btn:hover:not(:disabled) { border-color: var(--clay); color: var(--clay); }
.stepper-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.stepper-value {
    font-family: var(--serif);
    font-size: 26px;
    min-width: 32px;
    text-align: center;
}

.field-hint { color: var(--clay-deep); font-size: 13px; margin-top: -8px; }

.rsvp-note {
    font-size: 12.5px;
    color: var(--ink-faint);
    border-top: 1px dashed var(--line);
    padding-top: 20px;
    margin-bottom: 28px;
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: transparent;
    border: 1px solid var(--ink);
    color: var(--ink);
    font-size: 13px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: background 0.35s ease, color 0.35s ease;
}

.btn-submit:hover { background: var(--ink); color: var(--paper); }
.btn-submit .arrow { transition: transform 0.35s ease; }
.btn-submit:hover .arrow { transform: translateX(4px); }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
    padding: 60px 24px 46px;
    text-align: center;
    background: var(--ink);
    color: rgba(247, 241, 230, 0.72);
}

.site-footer .footer-mark {
    font-family: var(--serif);
    font-style: italic;
    font-size: 22px;
    color: var(--paper);
    margin-bottom: 10px;
}

.site-footer p { font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; }

/* =========================================================
   Sound toggle
   ========================================================= */
.sound-toggle {
    position: fixed;
    bottom: 26px;
    right: 26px;
    z-index: 250;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(32, 42, 32, 0.86);
    color: var(--paper);
    border-radius: 999px;
    border: 1px solid rgba(247, 241, 230, 0.25);
    cursor: pointer;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(8px);
}

.sound-bars {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 14px;
}

.sound-bars span {
    width: 3px;
    background: var(--paper);
    height: 4px;
    border-radius: 2px;
    transition: height 0.2s ease;
}

.sound-toggle.is-playing .sound-bars span:nth-child(1) { animation: barBounce 0.9s ease-in-out infinite; }
.sound-toggle.is-playing .sound-bars span:nth-child(2) { animation: barBounce 0.9s ease-in-out infinite 0.15s; }
.sound-toggle.is-playing .sound-bars span:nth-child(3) { animation: barBounce 0.9s ease-in-out infinite 0.3s; }

@keyframes barBounce {
    0%, 100% { height: 4px; }
    50% { height: 14px; }
}

.sound-toggle-label {
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    white-space: nowrap;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 768px) {
    .nav { padding: 20px 22px; }
    .nav.is-scrolled { padding: 14px 22px; }
    .nav-chapters { gap: 16px; }
    .nav-chapters a { font-size: 9.5px; }
    .nav-chapters a .chapter-index { display: none; }

    .hero { padding: 118px 18px 70px; background-attachment: scroll; min-height: 75vh; background-position: 42% center; }
    .ledger-cell { padding: 0 12px; }

    .chapter { padding: 70px 18px; }
    .chapter-heading h2 { font-size: 26px; }

    .divider-scene { background-attachment: scroll; }
    .divider-frame { padding: 24px 26px; }

    .reply-card { padding: 30px 22px; }

    .sound-toggle-label { display: none; }
    .sound-toggle { padding: 12px; bottom: 18px; right: 18px; }
}

@media (max-width: 420px) {
    .hero-names { font-size: 40px; }
    .ledger-cell { padding: 0 8px; }
    .ledger-value { font-size: 24px; }
}