/* BUPT alumni AI photo — gown-placket look: BUPT blue placket, telegraph marks, doctor-gown gold */

:root {
  --paper: #F3F5FA;
  --surface: #FFFFFF;
  --ink: #0D1A3A;
  --ink-soft: #4B5677;
  --ink-faint: #7B86A3;
  --line: #D9DFEB;
  --placket: #1B4BC6;       /* gown placket blue */
  --placket-mark: #0A2470;  /* unlit telegraph marks on the placket */
  --gold: #E2AA36;          /* doctor-gown trim; lit marks */
  --red: #B42F27;
  --logo: #1234A0;
  --on-placket: #FFFFFF;
  --shadow: 0 1px 2px rgba(13, 26, 58, .06), 0 8px 24px rgba(13, 26, 58, .07);
  --swatch-bachelor: #16181D;
  --swatch-master: #1B4BC6;
  --swatch-doctor: #C8231C;

  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --mono: ui-monospace, "SF Mono", "Menlo", "Consolas", "Roboto Mono", monospace;

  --radius: 10px;
  --gutter: 16px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #070D1F;
    --surface: #0F1A36;
    --ink: #E8EDF8;
    --ink-soft: #A3AECB;
    --ink-faint: #7582A3;
    --line: #22305A;
    --placket: #2356DE;
    --placket-mark: #0B1F5E;
    --gold: #F2C45A;
    --red: #FF8A7E;
    --logo: #C9D6FF;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
    --swatch-bachelor: #05060A;
    --swatch-master: #2E62F0;
    --swatch-doctor: #E0342A;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #070D1F;
  --surface: #0F1A36;
  --ink: #E8EDF8;
  --ink-soft: #A3AECB;
  --ink-faint: #7582A3;
  --line: #22305A;
  --placket: #2356DE;
  --placket-mark: #0B1F5E;
  --gold: #F2C45A;
  --red: #FF8A7E;
  --logo: #C9D6FF;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  --swatch-bachelor: #05060A;
  --swatch-master: #2E62F0;
  --swatch-doctor: #E0342A;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
img { display: block; max-width: 100%; }
button, input { font: inherit; color: inherit; }
[hidden] { display: none !important; }
p { margin: 0; }
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
:focus-visible { outline: 3px solid var(--placket); outline-offset: 2px; border-radius: 4px; }

/* ---------- layout ---------- */

.layout { min-height: 100vh; }
.showcase { position: relative; }
.panel {
  padding: 8px var(--gutter) calc(48px + env(safe-area-inset-bottom));
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- masthead ---------- */

.masthead {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 16px;
  padding: calc(20px + env(safe-area-inset-top)) var(--gutter) 20px;
  max-width: 560px;
  margin: 0 auto;
}
.masthead-text { padding-top: 4px; }
.logo {
  display: block;
  width: 150px;
  aspect-ratio: 357 / 96;
  background: var(--logo);
  -webkit-mask: url("/static/bupt-logo.png") left center / contain no-repeat;
  mask: url("/static/bupt-logo.png") left center / contain no-repeat;
}
.eyebrow {
  margin-top: 22px;
  font: 500 12px/1.4 var(--mono);
  letter-spacing: .06em;
  color: var(--ink-soft);
}
.title {
  margin: 8px 0 0;
  font-size: clamp(30px, 9vw, 44px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: .01em;
}
.title span { display: block; white-space: nowrap; }
.title .title-dot { display: none; color: var(--placket); }
.lede {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 15px;
  max-width: 26em;
}

/* the placket: a vertical BUPT-blue band carrying the motto in telegraph marks */
.placket {
  position: relative;
  contain: size;            /* marks never set its height; the band just fills its slot */
  background: var(--placket);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0;
  gap: 2px;
}
.mk {
  display: block;
  height: 2px;
  width: 36%;
  background: var(--placket-mark);
  border-radius: 1px;
  flex: none;
}
.mk-dash { width: 74%; }
.mk-gap-digit { margin-top: 4px; }
.mk-gap-char { margin-top: 10px; }

/* ---------- gallery ---------- */

.gallery { max-width: 560px; margin: 0 auto; padding: 0 0 8px; }
.gallery-tabs {
  display: flex;
  gap: 6px;
  padding: 0 var(--gutter) 12px;
}
.tab {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 14px;
  font-family: var(--sans);
  color: var(--ink-soft);
  cursor: pointer;
}
.tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.gallery-track {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0 var(--gutter) 8px;
  scroll-padding: 0 var(--gutter);
  scrollbar-width: none;
}
.gallery-track::-webkit-scrollbar { display: none; }
.slide {
  flex: 0 0 86%;
  scroll-snap-align: start;
  margin: 0;
}
.slide-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.slide-pair img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 6px;
  background: var(--line);
}
.slide-cap { padding-top: 10px; }
.slide-name { font: 600 19px/1.3 var(--sans); letter-spacing: .08em; }
.slide-desc { font-size: 14px; color: var(--ink-soft); margin-top: 2px; }

/* ---------- form ---------- */

.form { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.step {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 16px 18px;
}
.step-head {
  display: flex;
  align-items: center;
  gap: 10px;
  float: left;              /* lets legend sit inside the padded box on all browsers */
  width: 100%;
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 10px;
}
.step-head + * { clear: both; }
.step-num {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--placket);
  color: var(--on-placket);
  font: 600 13px/1 var(--mono);
}
.hint { color: var(--ink-soft); font-size: 14px; }
.meta { color: var(--ink-faint); font-size: 13px; }

/* photos */
.photos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 8px;
  margin-top: 14px;
}
.photo {
  position: relative;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  background: var(--line);
}
.photo img { width: 100%; height: 100%; object-fit: cover; }
.photo-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 50%;
  background: rgba(7, 13, 31, .72);
  color: #fff;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.photo-busy {
  display: grid;
  place-items: center;
  font-size: 12px;
  color: var(--ink-soft);
}
.photo-add {
  position: relative;
  aspect-ratio: 1;
  border: 1.5px dashed var(--ink-faint);
  border-radius: 8px;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 2px;
  cursor: pointer;
  color: var(--ink-soft);
}
.photo-add input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.photo-add:focus-within { outline: 3px solid var(--placket); outline-offset: 2px; }
.photo-add-icon {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linejoin: round;
}
.photo-add-text { font-size: 13px; }
#photo-count { margin-top: 8px; }

/* style cards */
.styles { display: grid; gap: 10px; }
.style-card {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  align-items: center;
  padding: 10px 12px 10px 10px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  overflow: hidden;
}
.style-card input { position: absolute; opacity: 0; pointer-events: none; }
.style-card img {
  width: 64px;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 5px;
  background: var(--line);
}
.style-name { display: block; font: 600 18px/1.3 var(--sans); letter-spacing: .08em; }
.style-desc { display: block; font-size: 13px; line-height: 1.45; color: var(--ink-soft); margin-top: 2px; }
/* .is-checked is set by app.js (no :has(), older WeChat webviews lack it) */
.style-card.is-checked { border-color: var(--placket); }
.style-card.is-checked::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--placket);
}
.style-card:focus-within { outline: 3px solid var(--placket); outline-offset: 2px; }

/* options */
.options {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
.option-label { font-weight: 600; font-size: 15px; margin-bottom: 8px; }
.option-sub { font-weight: 400; font-size: 13px; color: var(--ink-faint); margin-left: 6px; }
.segmented { display: flex; gap: 8px; flex-wrap: wrap; }
.seg { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 42px;
  padding: 0 18px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  font-size: 15px;
}
.seg input:checked + span { border-color: var(--placket); background: var(--placket); color: var(--on-placket); }
.seg input:focus-visible + span { outline: 3px solid var(--placket); outline-offset: 2px; }
.swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  box-shadow: 0 0 0 1.5px rgba(255, 255, 255, .7);
}
.swatch-bachelor { background: var(--swatch-bachelor); }
.swatch-master { background: var(--swatch-master); }
.swatch-doctor { background: var(--swatch-doctor); }
.option .meta { margin-top: 8px; }

/* poses: two per row, multi-select checkboxes */
.poses {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 10px;
}
.pose { position: relative; display: block; cursor: pointer; min-width: 0; }
.pose input { position: absolute; opacity: 0; pointer-events: none; }
.pose-img {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid transparent;
  background: var(--line);
  background-clip: padding-box;
}
.pose-img img { width: 100%; height: 100%; object-fit: cover; }
/* tick in the corner */
.pose-img::after {
  content: "";
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: rgba(7, 13, 31, .28);
  box-shadow: 0 1px 3px rgba(7, 13, 31, .35);
}
.pose input:checked ~ .pose-img::after {
  border-color: var(--placket);
  background: var(--placket) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23fff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 16px no-repeat;
}
.pose-random {
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 6px;
  background: var(--paper);
  border: 2px dashed var(--line);
  color: var(--ink-soft);
  font-size: 13px;
  text-align: center;
  line-height: 1.4;
}
.pose-random b { font: 600 30px/1 var(--mono); color: var(--placket); }
/* even number of poses: "random" gets a row of its own so the pictures stay in full rows */
.pose-wide { grid-column: 1 / -1; }
.pose-wide .pose-img { aspect-ratio: auto; min-height: 64px; }
.pose-wide .pose-random { grid-auto-flow: column; gap: 12px; padding: 12px 44px; }
.pose-wide .pose-random b { font-size: 24px; }
.pose-wide .pose-img::after { top: 50%; margin-top: -12px; }
.pose-name {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.3;
  text-align: center;
  color: var(--ink-soft);
}
.pose-wide .pose-name { display: none; }
.pose input:checked ~ .pose-img { border-color: var(--placket); border-style: solid; }
.pose input:checked ~ .pose-name { color: var(--ink); font-weight: 600; }
.pose input:focus-visible ~ .pose-img { outline: 3px solid var(--placket); outline-offset: 2px; }

/* consent */
.consent {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
  font-size: 15px;
  cursor: pointer;
}
.consent input {
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  accent-color: var(--placket);
}

/* submit */
.submit-area { display: grid; gap: 8px; padding-top: 4px; }
.submit-missing { text-align: center; }
#remaining { text-align: center; }
.alert {
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--surface);
  background: color-mix(in srgb, var(--red) 10%, var(--surface));
  border-left: 4px solid var(--red);
  color: var(--ink);
  font-size: 15px;
}

/* ---------- buttons ---------- */

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  background: var(--surface);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .12s ease, background-color .15s ease;
}
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--placket); border-color: var(--placket); color: var(--on-placket); }
.btn-block { width: 100%; min-height: 54px; font-size: 17px; letter-spacing: .08em; }
.btn:disabled { background: var(--line); border-color: var(--line); color: var(--ink-faint); cursor: not-allowed; transform: none; }
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* ---------- waiting ---------- */

.wait {
  display: grid;
  justify-items: center;
  text-align: center;
  padding: 24px 0 8px;
}
.wait-kicker {
  font: 500 13px/1.4 var(--mono);
  letter-spacing: .12em;
  color: var(--ink-soft);
}
.wait-big {
  margin-top: 6px;
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
}
.wait-big b { font-family: var(--mono); color: var(--placket); font-weight: 700; }
.wait-sub { margin-top: 4px; color: var(--ink-soft); }
.wait-summary { margin-top: 22px; font-family: var(--sans); letter-spacing: .06em; }
.wait-note { margin-top: 6px; }
.wait-net { margin-top: 10px; color: var(--red); }

.telegraph {
  display: flex;
  gap: 22px;
  margin-top: 26px;
}
.tg-col { display: grid; grid-template-columns: auto 22px; gap: 10px; }
.tg-col:last-child { grid-template-columns: 22px auto; }
.tg-col:last-child .tg-chars { order: 2; }
.tg-chars { display: flex; flex-direction: column; justify-content: space-around; padding: 10px 0; }
.tg-char {
  font: 600 18px/1 var(--sans);
  color: var(--line);
  transition: color .4s ease;
}
.tg-char.is-lit { color: var(--ink); }
.tg-band {
  background: var(--placket);
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0;
  gap: 1.5px;
}
.tg-band .mk { height: 2px; width: 34%; transition: background-color .35s ease, box-shadow .35s ease; }
.tg-band .mk-dash { width: 72%; }
.tg-band .mk-gap-digit { margin-top: 3px; }
.tg-band .mk-gap-char { margin-top: 8px; }
.tg-band .mk.is-lit { background: var(--gold); box-shadow: 0 0 6px color-mix(in srgb, var(--gold) 60%, transparent); }
.tg-band .mk.is-next { animation: tick 1s steps(2, jump-none) infinite; }
@keyframes tick { 50% { background: var(--gold); } }

/* ---------- result ---------- */

.screen-title { margin: 20px 0 0; font-size: 28px; font-weight: 800; }
.result-summary { margin-top: 4px; font-family: var(--sans); letter-spacing: .06em; color: var(--ink-soft); }
.result-note { margin-top: 6px; color: var(--ink-soft); }
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}
.result-grid.is-single { grid-template-columns: minmax(0, 300px); justify-content: center; }
.shot { margin: 0; display: grid; gap: 8px; }
.shot-open {
  display: block;
  padding: 0;
  border: 0;
  background: var(--line);
  border-radius: 8px;
  overflow: hidden;
  cursor: zoom-in;
}
.shot-open img { width: 100%; aspect-ratio: 1024 / 1623; object-fit: cover; }
.shot-label { font-size: 13px; color: var(--ink-soft); text-align: center; }
.shot .btn { min-height: 42px; font-size: 15px; }
.result-tip { margin-top: 14px; text-align: center; }
.result .actions { margin-top: 14px; }
#result-remaining { margin-top: 12px; text-align: center; }

/* ---------- notice ---------- */

.notice { padding: 8px 0; }
.notice-text { margin: 10px 0 20px; font-size: 16px; color: var(--ink-soft); }

/* ---------- history ---------- */

.history { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); }
.history-title { margin: 0 0 4px; font-size: 17px; }
.history-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}
.history-item {
  width: 100%;
  display: grid;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  text-align: left;
  cursor: pointer;
}
.history-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.history-pair.is-single img { grid-column: 1 / -1; aspect-ratio: 4 / 3; object-position: top; }
.history-pair img { width: 100%; aspect-ratio: 2 / 3; object-fit: cover; border-radius: 4px; background: var(--line); }
.history-name { font: 600 14px/1.3 var(--sans); letter-spacing: .06em; }
.history-time { font: 12px/1.3 var(--mono); color: var(--ink-faint); }

/* ---------- viewer & toast ---------- */

.viewer {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: #04081A;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: calc(52px + env(safe-area-inset-top)) 12px calc(12px + env(safe-area-inset-bottom));
}
.viewer-img { justify-self: center; align-self: center; max-height: 100%; width: auto; object-fit: contain; border-radius: 4px; }
.viewer-close {
  position: absolute;
  top: calc(8px + env(safe-area-inset-top));
  right: 10px;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  color: #fff;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
}
.viewer-bar { display: grid; gap: 10px; justify-items: center; padding-top: 12px; }
.viewer-tip { color: rgba(255, 255, 255, .7); font-size: 13px; }
.viewer-bar .btn { min-width: 200px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(28px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 30;
  max-width: calc(100% - 32px);
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--paper);
  font-size: 15px;
  box-shadow: var(--shadow);
}

/* ---------- wide screens: showcase left, placket as divider, panel right ---------- */

@media (min-width: 960px) {
  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(420px, 480px);
    max-width: 1320px;
    margin: 0 auto;
  }
  .showcase {
    position: sticky;
    top: 0;
    height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr;
    padding-right: 34px;
    overflow: hidden;
  }
  .masthead {
    grid-template-columns: 1fr;
    max-width: none;
    margin: 0;
    padding: 36px 40px 18px;
  }
  .masthead .placket {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    width: 20px;
  }
  .title { font-size: 52px; }
  .title span { display: inline; }
  .title .title-dot { display: inline; }
  .gallery {
    max-width: none;
    margin: 0;
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 0;
    padding: 0 40px 28px;
  }
  .gallery-tabs { padding: 0 0 14px; }
  .gallery-track { padding: 0; scroll-padding: 0; min-height: 0; }
  .slide { flex-basis: 100%; display: grid; grid-template-rows: minmax(0, 1fr) auto; min-height: 0; }
  .slide-pair { min-height: 0; grid-template-rows: minmax(0, 1fr); }
  .slide-pair img { height: 100%; aspect-ratio: auto; object-position: center 30%; }
  .panel { max-width: none; margin: 0; padding: 36px 32px 60px 34px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}