/* ============================================================
 *  毕业回忆祝福页  ·  主样式
 *  原则: 移动优先 / 只动 transform·opacity / 尊重 prefers-reduced-motion
 * ========================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC",
                Georgia, "Times New Roman", serif;
  --font-hand: "Xingkai SC", "Kaiti SC", "STKaiti", "KaiTi", "PingFang SC", cursive;
  --maxw: 680px;
  --ease: cubic-bezier(.22,.7,.2,1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.8;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color .6s var(--ease), color .6s var(--ease);
}

img { max-width: 100%; display: block; }
::selection { background: var(--c-primary); color: #fff; }

/* ---------- 背景：网格渐变 + 粒子 + 彩带 ---------- */
.bg-mesh {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(58% 48% at 16% 12%, var(--grad-2), transparent 60%),
    radial-gradient(52% 44% at 86% 16%, var(--grad-3), transparent 62%),
    radial-gradient(75% 62% at 50% 104%, var(--grad-1), transparent 66%),
    var(--c-bg);
  transition: background .6s var(--ease);
}
.bg-mesh::before {     /* 缓慢漂移的柔光团，提供环境动感 */
  content: ""; position: absolute; inset: -20%;
  background:
    radial-gradient(38% 38% at 30% 30%, var(--grad-3), transparent 70%),
    radial-gradient(32% 32% at 72% 64%, var(--grad-2), transparent 70%);
  opacity: .5; filter: blur(40px);
  animation: drift 26s ease-in-out infinite alternate;
  will-change: transform;
}
@keyframes drift {
  from { transform: translate3d(-3%, -2%, 0) scale(1); }
  to   { transform: translate3d(3%, 3%, 0) scale(1.08); }
}

.bg-canvas, .fx-canvas {
  position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none;
}
.bg-canvas { z-index: -1; }
.fx-canvas { z-index: 70; }

/* ---------- 顶部滚动进度条 ---------- */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 100%; z-index: 90;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
}

/* ---------- 载入动画 ---------- */
.loader {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  background: var(--c-bg);
  transition: opacity .8s var(--ease), visibility .8s;
}
.loader.hide { opacity: 0; visibility: hidden; }
.loader__cap { font-size: 54px; animation: capBob 1.6s ease-in-out infinite; }
@keyframes capBob { 0%,100% { transform: translateY(0) rotate(-6deg); } 50% { transform: translateY(-14px) rotate(6deg); } }
.loader__title {
  font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; letter-spacing: .22em;
  background: linear-gradient(100deg, var(--c-muted) 30%, var(--c-primary) 50%, var(--c-muted) 70%);
  background-size: 220% 100%; -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: shimmer 2.2s linear infinite;
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
.loader__dots { display: flex; gap: 7px; }
.loader__dots span { width: 7px; height: 7px; border-radius: 50%; background: var(--c-primary); opacity: .35; animation: dot 1.2s ease-in-out infinite; }
.loader__dots span:nth-child(2) { animation-delay: .18s; }
.loader__dots span:nth-child(3) { animation-delay: .36s; }
@keyframes dot { 0%,100% { opacity: .3; transform: translateY(0); } 50% { opacity: 1; transform: translateY(-5px); } }

/* ---------- 主题切换器 ---------- */
.theme-switch {
  position: fixed; z-index: 200;
  top: calc(env(safe-area-inset-top, 0px) + 14px);
  right: calc(env(safe-area-inset-right, 0px) + 14px);
  display: flex; flex-direction: column; align-items: flex-end; gap: 10px;
}
.theme-toggle {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--hairline);
  background: var(--glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow); cursor: pointer; display: grid; place-items: center;
  transition: transform .25s var(--ease);
}
.theme-toggle:active { transform: scale(.92); }
.theme-toggle__icon {
  width: 22px; height: 22px; border-radius: 50%;
  background: conic-gradient(from 210deg, var(--grad-3), var(--c-primary), var(--c-accent), var(--grad-2), var(--grad-3));
  box-shadow: inset 0 0 0 2px var(--c-surface);
}
.theme-panel {
  display: flex; flex-direction: column; gap: 4px; padding: 8px;
  border-radius: 16px; border: 1px solid var(--hairline);
  background: var(--glass); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  opacity: 0; transform: translateY(-8px) scale(.96); transform-origin: top right;
  pointer-events: none; transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.theme-panel.open { opacity: 1; transform: none; pointer-events: auto; }
.swatch {
  display: flex; align-items: center; gap: 10px; padding: 7px 12px 7px 8px;
  border: none; background: transparent; border-radius: 11px; cursor: pointer;
  color: var(--c-text); font-family: var(--font-sans); font-size: .9rem; white-space: nowrap;
  transition: background .2s;
}
.swatch:hover { background: color-mix(in srgb, var(--c-primary) 12%, transparent); }
.swatch[aria-checked="true"] { background: color-mix(in srgb, var(--c-primary) 16%, transparent); font-weight: 600; }
.swatch__dot {
  width: 22px; height: 22px; border-radius: 50%; flex: none;
  background: conic-gradient(var(--s1), var(--s2), var(--s3), var(--s1));
  box-shadow: inset 0 0 0 2px var(--c-surface), 0 1px 4px rgba(0,0,0,.18);
}

/* ---------- 通用排版 ---------- */
.content { position: relative; z-index: 1; }

.hero, .section, .footer { padding-left: 22px; padding-right: 22px; }

/* ---------- 首屏 Hero ---------- */
.hero {
  min-height: 100svh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  padding-top: 14vh; padding-bottom: 16vh; position: relative;
}
.hero__inner { max-width: var(--maxw); width: 100%; }
.hero__eyebrow {
  font-size: .9rem; letter-spacing: .42em; color: var(--c-primary);
  margin: 0 0 .6em; padding-left: .42em; font-weight: 600;
}
.hero__title {
  font-family: var(--font-serif); font-weight: 800;
  font-size: clamp(3rem, 17vw, 5.4rem); line-height: 1.04; margin: 0;
}
.char {
  display: inline-block;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sp { display: inline-block; }
.hero__subtitle {
  font-family: var(--font-serif); font-style: italic; font-size: 1.18rem;
  color: var(--c-muted); margin: .9em auto .2em; max-width: 22em;
}
.hero__body { color: var(--c-muted); font-size: 1.02rem; margin: 1em auto 0; max-width: 26em; }
.hero__body p { margin: .5em 0; }
.hero__name {
  font-family: var(--font-hand); font-size: 1.25rem; color: var(--c-text);
  margin-top: 1.3em; letter-spacing: .04em;
}
.hero__stat { display: inline-flex; align-items: center; gap: 18px; margin-top: 1.6em; }
.stat { display: flex; flex-direction: column; align-items: center; }
.stat__num { font-family: var(--font-serif); font-size: 1.9rem; font-weight: 800; color: var(--c-primary); line-height: 1; }
.stat__label { font-size: .76rem; color: var(--c-muted); margin-top: .4em; letter-spacing: .05em; }
.stat__sep { width: 1px; height: 30px; background: var(--hairline); }

.scroll-hint {
  margin-top: 8vh; background: none; border: none; cursor: pointer;
  color: var(--c-muted); font-size: .82rem; letter-spacing: .14em;
  display: inline-flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--font-sans);
}
.scroll-hint__chev {
  width: 12px; height: 12px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg); animation: bob 1.6s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translateY(0) rotate(45deg); } 50% { transform: translateY(6px) rotate(45deg); } }

/* ---------- 内容分节 ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding-top: 8vh; padding-bottom: 8vh; }
.section__inner > * { margin-top: 0; margin-bottom: 0; }
.section__inner > * + * { margin-top: 1.1em; }

.section__inner h2 {
  font-family: var(--font-serif); font-weight: 800;
  font-size: clamp(1.7rem, 7.5vw, 2.4rem); line-height: 1.2;
  margin-bottom: .2em; position: relative; padding-top: .3em;
}
.section__inner h2::before {
  content: ""; display: block; width: 44px; height: 4px; border-radius: 4px; margin-bottom: .5em;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
}
.section__inner h3 { font-family: var(--font-serif); font-size: 1.25rem; }
.section__inner p { color: var(--c-text); font-size: 1.06rem; }
.section__inner strong { color: var(--c-primary); }
.section__inner a { color: var(--c-primary); text-underline-offset: 3px; }

.section__inner blockquote {
  margin: 1.2em 0; padding: 1.1em 1.3em; border-radius: 16px;
  background: var(--glass); border: 1px solid var(--hairline);
  border-left: 4px solid var(--c-primary);
  box-shadow: var(--shadow); position: relative; font-family: var(--font-serif);
  font-style: italic; color: var(--c-text);
}
.section__inner blockquote p { margin: .3em 0; }
.section__inner blockquote::before {
  content: "\201C"; position: absolute; top: -.1em; left: .2em;
  font-size: 3rem; line-height: 1; color: var(--c-primary); opacity: .22; font-family: var(--font-serif);
}

.section__inner ul { list-style: none; padding-left: 0; }
.section__inner ul li { position: relative; padding-left: 1.5em; margin: .5em 0; }
.section__inner ul li::before {
  content: ""; position: absolute; left: .2em; top: .72em;
  width: 7px; height: 7px; border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
}

/* ---------- 图片（骨架 + 淡入 + 点击看大图） ---------- */
.media { margin: 1.5em 0; }
.media__frame {
  position: relative; aspect-ratio: 3 / 2; border-radius: 20px; overflow: hidden;
  background: var(--glass); box-shadow: var(--shadow); cursor: zoom-in;
  border: 1px solid var(--hairline);
}
.media__img {
  width: 100%; height: 100%; object-fit: cover; opacity: 0;
  transition: opacity .9s var(--ease);
}
.media.loaded .media__img { opacity: 1; }
.media__skeleton {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--c-muted); font-size: .85rem;
  background:
    linear-gradient(100deg, transparent 20%, color-mix(in srgb, var(--c-surface) 60%, transparent) 50%, transparent 80%),
    color-mix(in srgb, var(--c-primary) 8%, var(--c-surface));
  background-size: 220% 100%, 100% 100%;
  animation: skel 1.5s linear infinite; transition: opacity .5s;
}
@keyframes skel { from { background-position: 180% 0, 0 0; } to { background-position: -180% 0, 0 0; } }
.media.loaded .media__skeleton { opacity: 0; }
.media figcaption {
  text-align: center; color: var(--c-muted); font-size: .88rem; margin-top: .7em;
  font-family: var(--font-serif); font-style: italic;
}

/* ---------- 视频：9:16 卡片 + 横向滑动相册 ---------- */
.video-row {
  display: flex; gap: 14px; overflow-x: auto; scroll-snap-type: x mandatory;
  margin: 1.5em -22px; padding: 6px 22px 16px;
  -webkit-overflow-scrolling: touch; scrollbar-width: none;
  scroll-padding: 0 22px;
}
.video-row::-webkit-scrollbar { display: none; }
.media--video { margin: 1.5em auto; width: min(34vw, 120px); }
.video-row .media--video { flex: 0 0 auto; margin: 0; scroll-snap-align: center; }
.media--video .media__frame { aspect-ratio: 9 / 16; cursor: pointer; }
.media--video video { width: 100%; height: 100%; object-fit: cover; display: block; background: #000; }
/* 声音状态徽标：自动播放默认静音，轻触开声 */
.video-mute {
  position: absolute; right: 6px; bottom: 6px; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; pointer-events: none;
  background: rgba(0,0,0,.45); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  transition: background .25s var(--ease);
}
.video-mute::before { content: "🔇"; font-size: 13px; line-height: 1; }
.media--video.sound .video-mute { background: var(--c-primary); }
.media--video.sound .video-mute::before { content: "🔊"; }
/* 标题上方的开场短片墙 */
.hero__videos { margin-top: 0; margin-bottom: 1.6em; }

/* ---------- 多图拼贴网格 ---------- */
.photo-grid { display: grid; gap: 10px; margin: 1.4em 0; }
.photo-grid .media { margin: 0; }
.photo-grid .media__frame { aspect-ratio: 1 / 1; border-radius: 14px; box-shadow: 0 6px 18px rgba(0,0,0,.14); }
.photo-grid figcaption { display: none; }

/* ---------- 页脚 / 署名 ---------- */
.footer {
  max-width: var(--maxw); margin: 0 auto; text-align: center;
  padding-top: 9vh; padding-bottom: calc(10vh + env(safe-area-inset-bottom, 0px));
}
.footer__cap { font-size: 40px; margin-bottom: .4em; }
.footer__sign { font-family: var(--font-hand); font-size: 1.4rem; color: var(--c-text); margin: .2em 0; }
.footer__date { color: var(--c-muted); letter-spacing: .12em; margin: .2em 0 1.4em; }
.btn-celebrate {
  font-family: var(--font-sans); font-size: 1rem; color: #fff; cursor: pointer;
  padding: .7em 1.6em; border: none; border-radius: 999px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
  box-shadow: var(--shadow); transition: transform .2s var(--ease), filter .2s;
}
.btn-celebrate:hover { filter: brightness(1.05); }
.btn-celebrate:active { transform: scale(.95); }
.footer__made { color: var(--c-muted); font-size: .8rem; margin-top: 1.8em; opacity: .8; }

/* ---------- 灯箱 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 500; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px; padding: 24px;
  background: var(--scrim); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden; transition: opacity .35s var(--ease), visibility .35s;
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox__img {
  max-width: 94vw; max-height: 80vh; width: auto; height: auto; object-fit: contain;
  border-radius: 14px; box-shadow: 0 24px 70px rgba(0,0,0,.5);
  transform: scale(.94); transition: transform .35s var(--ease);
}
.lightbox.open .lightbox__img { transform: scale(1); }
.lightbox__cap { color: #fff; font-family: var(--font-serif); font-style: italic; font-size: .95rem; text-align: center; margin: 0; }
.lightbox__close {
  position: absolute; top: calc(env(safe-area-inset-top,0px) + 14px); right: 18px;
  width: 42px; height: 42px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(255,255,255,.16); color: #fff; font-size: 1.6rem; line-height: 1;
}

/* ---------- 出错提示 ---------- */
.error-box {
  max-width: var(--maxw); margin: 22vh auto; padding: 2em; text-align: center;
  background: var(--glass); border: 1px solid var(--hairline); border-radius: 20px;
}
.error-box__hint { color: var(--c-muted); font-size: .9rem; margin-top: 1em; }
.error-box code { background: color-mix(in srgb, var(--c-primary) 12%, transparent); padding: .15em .5em; border-radius: 6px; }

/* ============================================================
 *  入场动效（仅在用户未要求“减少动态效果”时启用）
 * ========================================================== */
@media (prefers-reduced-motion: no-preference) {
  .rise { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
  .visible .rise, .footer.visible.rise, .rise.visible { transition-delay: calc(var(--i, 0) * 70ms); }
  .visible .rise { opacity: 1; transform: none; }

  .char { opacity: 0; transform: translateY(46px) rotate(8deg); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: calc(var(--ci, 0) * 55ms + .15s); }
  .hero.visible .char { opacity: 1; transform: none; }

  .media__img { transform: scale(1.07); transition: opacity .9s var(--ease), transform 1.3s var(--ease); }
  .media.loaded .media__img { transform: scale(1); }
}

/* 尊重“减少动态效果”：关闭粒子层、漂移、骨架闪烁，内容直接呈现 */
@media (prefers-reduced-motion: reduce) {
  .bg-canvas, .fx-canvas { display: none; }
  .bg-mesh::before { animation: none; }
  .loader__cap, .loader__dots span, .scroll-hint__chev { animation: none; }
  .media__skeleton { animation: none; }
  * { scroll-behavior: auto !important; }
}

/* 窄屏微调 */
@media (max-width: 360px) {
  .hero, .section, .footer { padding-left: 18px; padding-right: 18px; }
  .hero__stat { gap: 12px; }
}