/* ==========================================================================
   青衿纪念册 · 基础层 v2
   ---------------------------------------------------------------------------
   设计系统说明：
     · 颜色：以「青衿」为主色的四组氛围（data-mood 切换），全部经过对比度检查，
       正文在任意氛围下都保持 ≥ 4.5:1。
     · 排版：Display / Body 两套字族 + clamp() 流式字号，标题收紧字距。
     · 表面：三级玻璃（glass-1/2/3）+ 渐变描边（.surface），统一圆角与阴影阶梯。
     · 动效：统一时长与缓动令牌，全部遵循 prefers-reduced-motion。
   ========================================================================== */

/* ---------------------------------------------------------- 氛围主题 */
:root {
  /* 主色会在下面按氛围覆盖；这里是「青衿」默认值 */
  --c-primary: #22d3b8;
  --c-accent: #ffcf7a;
  --c-violet: #8b7cf6;
  --c-amber: #ffb020;
  --c-coral: #ff7a6b;

  /* 深色电影感底 */
  --ink: #07201f;
  --ink-2: #2f5654;
  --ink-3: #6d8b89;
  --paper: #ffffff;
  --paper-2: rgba(255, 255, 255, .80);

  /* 文字（深底上的三级亮度，替代写死的 rgba(255,255,255,x)） */
  --t-1: #ffffff;
  --t-2: rgba(255, 255, 255, .78);
  --t-3: rgba(255, 255, 255, .56);
  --t-4: rgba(255, 255, 255, .38);

  /* 描边与表面 */
  --line: rgba(13, 43, 42, .12);
  --line-2: rgba(255, 255, 255, .22);
  --stroke-1: rgba(255, 255, 255, .16);
  --stroke-2: rgba(255, 255, 255, .28);
  --glass-1: rgba(255, 255, 255, .07);
  --glass-2: rgba(255, 255, 255, .12);
  --glass-3: rgba(255, 255, 255, .18);

  /* 圆角 */
  --r-xs: 10px;
  --r-sm: 14px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-xl: 40px;
  --radius: 22px;

  /* 阴影阶梯（越往上越"浮"） */
  --shadow-s: 0 2px 10px rgba(3, 20, 19, .18);
  --shadow-m: 0 14px 34px -12px rgba(2, 18, 17, .45);
  --shadow-l: 0 34px 80px -30px rgba(1, 14, 14, .72);
  --shadow-glow: 0 0 0 1px rgba(255, 255, 255, .06), 0 24px 60px -26px rgba(34, 211, 184, .5);

  /* 动效 */
  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-io: cubic-bezier(.65, .05, .36, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  --dur: .45s;
  --dur-fast: .22s;
  --dur-slow: .8s;

  /* 排版 */
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system,
          "Segoe UI", "Noto Sans SC", "Hiragino Sans GB", sans-serif;
  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
                  "Microsoft YaHei", system-ui, sans-serif;
  --fs-hero: clamp(2.1rem, 7.2vw, 4.6rem);
  --fs-h1: clamp(1.7rem, 4.4vw, 2.9rem);
  --fs-h2: clamp(1.35rem, 3vw, 2rem);
  --fs-h3: clamp(1.05rem, 2vw, 1.32rem);
  --fs-body: clamp(.94rem, 1.15vw, 1.02rem);
  --fs-small: .82rem;
  --tracking-tight: -.022em;
  --tracking-wide: .16em;

  /* 布局 */
  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 44px);

  /* 背景层默认值，运行时被 theme.php 覆盖 */
  --bg-blur: 0px;
  --bg-overlay: .55;
  --bg-brightness: 1;
  --bg-saturate: 1;
  --bg-attach: fixed;
  --bg-overlay-color: 8, 20, 28;
}

/* 晨曦：暖金调，适合白天看 */
html[data-mood="dawn"] {
  --c-primary: #ff9d6b;
  --c-accent: #7dffd8;
  --c-violet: #ff7aa2;
  --bg-overlay-color: 22, 14, 10;
}
/* 星夜：深紫调，最安静 */
html[data-mood="night"] {
  --c-primary: #8b7cf6;
  --c-accent: #7dffd8;
  --c-violet: #22d3b8;
  --c-amber: #ffcf7a;
}

*, *::before, *::after { box-sizing: border-box; }

/* hidden 属性必须永远生效：
   .btn / .progress 这类规则带 display，会盖掉浏览器默认的 [hidden]{display:none} */
[hidden] { display: none !important; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: var(--fs-body);
  color: var(--t-1);
  background: #04131a;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4, p, figure { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: color-mix(in srgb, var(--c-primary) 42%, transparent); color: #fff; }

/* 全局焦点环，键盘用户永远看得见 */
:focus-visible {
  outline: 2.5px solid color-mix(in srgb, var(--c-primary) 70%, white);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------------------------------------------------- 背景层 */
.cm-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  overflow: clip;
  pointer-events: none;
  background: linear-gradient(152deg, #0a3f42, #0f3247 46%, #221a44);
  contain: paint;
}

.cm-bg__media {
  position: absolute;
  inset: -2%;
  background-size: cover;
  background-position: center;
  filter: blur(var(--bg-blur)) brightness(var(--bg-brightness)) saturate(var(--bg-saturate));
  transform: scale(1.06);
  transition: opacity .9s ease;
  will-change: transform;
}

video.cm-bg__media {
  width: 104%;
  height: 104%;
  object-fit: cover;
  inset: -2%;
  background: transparent;
}

.cm-bg__media.is-motion { animation: bgDrift 46s var(--ease-io) infinite alternate; }

@keyframes bgDrift {
  0%   { transform: scale(1.06) translate3d(0, 0, 0); }
  50%  { transform: scale(1.13) translate3d(-1.6%, -1.1%, 0); }
  100% { transform: scale(1.08) translate3d(1.3%, .9%, 0); }
}

.cm-bg__overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 12% 6%, rgba(var(--bg-overlay-color), calc(var(--bg-overlay) * .6)), transparent 62%),
    radial-gradient(90% 70% at 88% 88%, rgba(var(--bg-overlay-color), calc(var(--bg-overlay) * .5)), transparent 60%),
    linear-gradient(180deg, rgba(var(--bg-overlay-color), var(--bg-overlay)), rgba(var(--bg-overlay-color), calc(var(--bg-overlay) * 1.2)));
}

.cm-bg__grain {
  position: absolute;
  inset: 0;
  opacity: .14;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

.cm-bg__fallback { background: linear-gradient(140deg, #22d3b8, #8b7cf6 55%, #ffcf7a); filter: saturate(1.05); }

/* ---------------------------------------------------------- 表面 / 容器 */
.glass {
  background: var(--paper-2);
  backdrop-filter: blur(22px) saturate(1.5);
  -webkit-backdrop-filter: blur(22px) saturate(1.5);
  border: 1px solid rgba(255, 255, 255, .5);
  box-shadow: var(--shadow-l);
}

/* 通用玻璃卡：带 1px 渐变描边和内高光，比纯半透明更有质感 */
.surface {
  position: relative;
  border-radius: var(--r-lg);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, .13), rgba(255, 255, 255, .04) 55%, rgba(255, 255, 255, .07));
  border: 1px solid var(--stroke-1);
  box-shadow: var(--shadow-m), inset 0 1px 0 rgba(255, 255, 255, .16);
  backdrop-filter: blur(18px) saturate(1.35);
  -webkit-backdrop-filter: blur(18px) saturate(1.35);
}

.surface--soft {
  background: linear-gradient(160deg, rgba(255, 255, 255, .08), rgba(255, 255, 255, .025));
  border-color: rgba(255, 255, 255, .12);
  box-shadow: var(--shadow-s);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* 页面内容浮在背景之上。
   必须用 :where() 把权重降到 0——否则 .welcome / .personal / .viewer
   这些全屏遮罩的 position:fixed 会被这条规则覆盖成 relative。 */
:where(.cm-page) > :where(*:not(.cm-bg)) { position: relative; z-index: 1; }

@media (prefers-reduced-motion: no-preference) {
  .cm-page--login .login-wrap,
  .cm-page--login .login-footer { animation: pageFade .55s ease both; }
}

@keyframes pageFade { from { opacity: 0; } to { opacity: 1; } }

/* ---------------------------------------------------------- 小标签 */
.pill {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .28em .78em;
  border-radius: 999px;
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: .04em;
  background: var(--glass-2);
  border: 1px solid var(--stroke-1);
  color: var(--t-2);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .45em 1em;
  border-radius: 999px;
  font-size: 13px;
  color: var(--t-2);
  background: rgba(255, 255, 255, .08);
  border: 1px solid var(--stroke-1);
  cursor: pointer;
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease, border-color var(--dur-fast) ease, transform var(--dur-fast) var(--ease);
}
.chip:hover { background: rgba(255, 255, 255, .16); color: #fff; transform: translateY(-1px); }
.chip[aria-pressed="true"], .chip.is-active {
  background: color-mix(in srgb, var(--c-primary) 26%, transparent);
  border-color: color-mix(in srgb, var(--c-primary) 55%, transparent);
  color: #eafffb;
}

/* ---------------------------------------------------------- 按钮 */
.btn {
  --btn-bg: var(--c-primary);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  padding: .74em 1.45em;
  border: 0;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .015em;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--dur-fast) var(--ease), box-shadow .3s var(--ease),
              background .3s ease, color .3s ease, border-color .3s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255, 255, 255, .6), transparent 62%);
  opacity: 0;
  transition: opacity .5s ease;
  z-index: -1;
}
.btn:hover::after { opacity: .38; }
.btn:active { transform: scale(.968); }

.btn--primary {
  color: #04211f;
  background: linear-gradient(118deg, var(--c-primary), color-mix(in srgb, var(--c-primary) 48%, #eafff9));
  box-shadow: 0 16px 34px -16px color-mix(in srgb, var(--c-primary) 85%, black),
              inset 0 1px 0 rgba(255, 255, 255, .5);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -18px color-mix(in srgb, var(--c-primary) 95%, black),
              inset 0 1px 0 rgba(255, 255, 255, .6);
}

.btn--accent {
  color: #3a2400;
  background: linear-gradient(118deg, var(--c-accent), color-mix(in srgb, var(--c-accent) 55%, #fff6df));
  box-shadow: 0 16px 34px -16px color-mix(in srgb, var(--c-amber) 80%, black),
              inset 0 1px 0 rgba(255, 255, 255, .55);
}

.btn--outline {
  color: #fff;
  background: rgba(255, 255, 255, .1);
  border: 1.5px solid var(--stroke-2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn--outline:hover { background: rgba(255, 255, 255, .2); transform: translateY(-2px); border-color: rgba(255, 255, 255, .5); }

.btn--ghost { color: var(--t-2); background: transparent; }
.btn--ghost:hover { color: #fff; background: rgba(255, 255, 255, .1); }

.btn--danger { color: #fff; background: linear-gradient(118deg, #ff8080, #dc3a54); }
.btn--soft { color: var(--ink); background: rgba(13, 43, 42, .07); }
.btn--soft:hover { background: rgba(13, 43, 42, .12); }
.btn--light { color: #07201f; background: #fff; box-shadow: var(--shadow-m); }

.btn--lg { padding: .98em 2em; font-size: 16px; }
.btn--sm { padding: .52em 1em; font-size: 13px; }
.btn--tiny { padding: .36em .85em; font-size: 12.5px; border-radius: 999px; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: .55; pointer-events: none; }

.btn__spinner {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, .45);
  border-top-color: #fff;
  display: none;
  animation: spin .7s linear infinite;
}
.btn.is-loading .btn__spinner { display: block; }
.btn.is-loading .btn__label { opacity: .72; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------- 表单 */
.field {
  position: relative;
  display: block;
  margin-bottom: 18px;
  --field-bg: rgba(255, 255, 255, .74);
}

.field__input {
  width: 100%;
  padding: 1.35em 3.2em 0.65em 3.1em;
  font-size: 15.5px;
  font-family: inherit;
  color: var(--ink);
  background: var(--field-bg);
  border: 1.5px solid rgba(13, 43, 42, .12);
  border-radius: 16px;
  outline: none;
  transition: border-color .3s ease, background .3s ease, box-shadow .3s ease, transform .3s var(--ease);
  appearance: none;
}
.field__input::placeholder { color: transparent; }

.field__label {
  position: absolute;
  left: 3.1em;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  font-size: 15px;
  pointer-events: none;
  transition: transform .32s var(--ease), font-size .32s var(--ease), color .3s ease, opacity .3s ease;
  transform-origin: left center;
}

.field__input:focus + .field__label,
.field__input:not(:placeholder-shown) + .field__label {
  transform: translateY(-140%) scale(.78);
  color: color-mix(in srgb, var(--c-primary) 82%, black);
  opacity: .95;
}

.field__icon {
  position: absolute;
  left: 1.05em;
  top: 50%;
  transform: translateY(-50%);
  font-size: 17px;
  opacity: .5;
  transition: transform .35s var(--ease), opacity .3s ease;
}
.field__input:focus ~ .field__icon { opacity: .95; transform: translateY(-50%) scale(1.12); }

.field__eye {
  position: absolute;
  right: .6em;
  top: 50%;
  transform: translateY(-50%);
  width: 2.2em; height: 2.2em;
  border: 0; border-radius: 50%;
  background: transparent;
  cursor: pointer;
  opacity: .55;
  transition: opacity .25s ease, background .25s ease;
}
.field__eye:hover { opacity: 1; background: rgba(13, 43, 42, .07); }

.field__line {
  position: absolute;
  left: 16px; right: 16px; bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .5s var(--ease);
}

.field.is-focus .field__input {
  border-color: color-mix(in srgb, var(--c-primary) 60%, white);
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 14px 32px -18px color-mix(in srgb, var(--c-primary) 85%, black);
}
.field.is-focus .field__line { transform: scaleX(1); }
.field.is-error .field__input { border-color: #ff6b6b; animation: shake .4s ease; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  font-size: 13.5px;
  color: var(--ink-2);
  cursor: pointer;
  user-select: none;
}
.checkbox input { width: 16px; height: 16px; accent-color: var(--c-primary); }

select, input[type="text"], input[type="password"], input[type="number"],
input[type="url"], input[type="search"], textarea { font-family: inherit; }

/* ---------------------------------------------------------- 提示条 / Toast */
.alert {
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: alertIn .45s var(--ease) both;
  border: 1px solid transparent;
}
.alert--error { background: #fff0f2; color: #b0213c; border-color: #ffd3db; }
.alert--success { background: #ecfdf5; color: #0a6d51; border-color: #bdf0d8; }
.alert--info { background: #eef4ff; color: #2a4b9b; border-color: #d3e0ff; }
.alert--warn { background: #fff8e6; color: #9a6100; border-color: #ffe6ad; }

@keyframes alertIn {
  from { opacity: 0; transform: translateY(-8px) scale(.98); }
  to { opacity: 1; transform: none; }
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 150%);
  padding: 13px 24px;
  border-radius: 999px;
  background: rgba(6, 26, 25, .94);
  color: #fff;
  font-size: 14.5px;
  font-weight: 600;
  box-shadow: var(--shadow-l);
  border: 1px solid var(--stroke-1);
  backdrop-filter: blur(14px);
  z-index: 9999;
  transition: transform .5s var(--ease), opacity .4s ease;
  opacity: 0;
  max-width: min(90vw, 460px);
  text-align: center;
}
.toast.is-show { transform: translate(-50%, 0); opacity: 1; }
.toast.is-error { background: linear-gradient(118deg, #d63a55, #ff8080); }

/* ---------------------------------------------------------- 轻量模式
   低端手机 / 省流量 / 省电模式下由 JS 给 <html> 加 data-lite="1"。
   这里统一关掉最贵的几项：毛玻璃、光晕、漂浮粒子、大位移动画。
   视觉上仍然完整，只是少了「氛围」。
   ---------------------------------------------------------- */
html[data-lite="1"] .cursor-glow,
html[data-lite="1"] .snow,
html[data-lite="1"] .bubbles span {
  display: none !important;
}
html[data-lite="1"] *,
html[data-lite="1"] *::before,
html[data-lite="1"] *::after {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}
html[data-lite="1"] .surface,
html[data-lite="1"] .glass,
html[data-lite="1"] .pnote,
html[data-lite="1"] .welcome {
  background-color: rgba(8, 26, 30, .9);
}
html[data-lite="1"] .reveal {
  transition-duration: .16s !important;
  transform: none !important;
}
html[data-lite="1"] .cm-bg__media.is-motion,
html[data-lite="1"] .hero__stack .shot,
html[data-lite="1"] .personal__glow,
html[data-lite="1"] .hero__glow {
  animation: none !important;
}
html[data-lite="1"] .cm-bg__grain { display: none; }

/* ---------------------------------------------------------- 纪念册预览条 */
.previewbar {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  max-width: min(96vw, 760px);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 12.5px;
  color: #f4fffb;
  background: rgba(8, 32, 34, .92);
  border: 1px solid rgba(255, 207, 122, .5);
  box-shadow: 0 18px 44px -20px rgba(0, 0, 0, .9);
  backdrop-filter: blur(12px);
}
.previewbar__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #ffcf7a;
  box-shadow: 0 0 10px #ffcf7a;
  animation: previewPulse 1.8s var(--ease-io) infinite;
}
@keyframes previewPulse {
  0%, 100% { opacity: .4; }
  50% { opacity: 1; }
}
.previewbar b { font-size: 12.5px; letter-spacing: .04em; color: #ffcf7a; }
.previewbar__text { color: rgba(255, 255, 255, .7); }
@media (max-width: 720px) {
  .previewbar { border-radius: 16px; font-size: 12px; bottom: 10px; padding: 10px 14px; }
  .previewbar__text { display: none; }
}

/* ---------------------------------------------------------- 滚动出现 */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease), transform .9s var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.reveal.is-in { opacity: 1; transform: none; }

/* 原生滚动驱动动画（不支持的浏览器自动回落到 .reveal + IntersectionObserver） */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .scroll-rise {
      animation: scrollRise linear both;
      animation-timeline: view();
      animation-range: entry 5% cover 28%;
    }
    .scroll-fade {
      animation: scrollFade linear both;
      animation-timeline: view();
      animation-range: entry 10% cover 34%;
    }
    @keyframes scrollRise { from { opacity: 0; transform: translateY(44px); } to { opacity: 1; transform: none; } }
    @keyframes scrollFade { from { opacity: 0; } to { opacity: 1; } }
  }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------- 滚动条 */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: rgba(255, 255, 255, .05); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--c-primary), var(--c-violet));
  border-radius: 999px;
  border: 3px solid transparent;
  background-clip: content-box;
}