/* ---------------------------------------------------------------
   v4 覆盖层：在 v3「播出单」方向之上做现代感收紧。
   改动集中在：排版尺度、粘性页眉、图像主导的卡片、深墨对比带。
   不新增第二种强调色，朱红仍是唯一 accent。
--------------------------------------------------------------- */

:root {
  --shell: 1216px;
  --ink-deep: #15120F;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

body {
  font-size: 15.5px;
  line-height: 1.72;
  letter-spacing: 0.002em;
  overflow-x: hidden;
}

.shell { padding: 0 40px; }

/* ---------- 粘性页眉 ---------- */

.top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(243, 238, 229, 0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--rule-soft);
}

.top-in { height: 68px; }

.brand {
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.012em;
}

.brand span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  padding-left: 10px;
  margin-left: 4px;
  border-left: 1px solid var(--rule);
}

.nav { gap: 4px; }

.nav a {
  font-size: 13.5px;
  padding: 7px 12px;
  border-radius: 999px;
  transition: background 160ms var(--ease-out), color 160ms var(--ease-out);
}

.nav a:hover { background: rgba(26, 23, 20, 0.05); }

.nav a[aria-current="page"] {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 标题尺度 ---------- */

.mast { padding: 76px 0 34px; }

.mast h1 {
  font-size: clamp(38px, 5.6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 600;
  margin: 20px 0 0;
  max-width: 13em;
}

.mast-sub {
  margin-top: 22px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-2);
  max-width: 38em;
}

.mast-id { margin-bottom: 6px; }

.mast-name {
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mast-role { font-size: 12.5px; }

.case-top { padding: 76px 0 0; }

.case-top h1 {
  font-size: clamp(32px, 4.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  max-width: 20em;
}

.section-head h2,
.prose h2 { letter-spacing: -0.018em; font-weight: 600; }

.prose h2 { font-size: 22px; }

/* ---------- 筛选条 ---------- */

.gal-tools {
  position: sticky;
  top: 68px;
  z-index: 30;
  background: rgba(243, 238, 229, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 12px 0;
}

.filters { gap: 6px; }

.filters button {
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: 0.005em;
}

.filters button[aria-pressed="true"] {
  background: var(--ink-deep);
  border-color: var(--ink-deep);
}

/* ---------- 作品卡：图像主导 ---------- */

.gal {
  gap: 64px 40px;
  padding-top: 34px;
}

.gal-item {
  border-top: none;
  padding-top: 0;
}

.cover {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #E6DCCC;
  transition: border-color 220ms var(--ease-out), box-shadow 320ms var(--ease-out), transform 320ms var(--ease-out);
}

.cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 620ms var(--ease-out);
}

/* 手机类截图：留出设备感，不裁切 */
.cover--phone {
  background:
    radial-gradient(120% 100% at 50% 0%, #F0E9DB 0%, #DED3BF 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cover--phone img {
  width: auto;
  height: 88%;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid rgba(26, 23, 20, 0.16);
  box-shadow: 0 22px 44px -22px rgba(26, 23, 20, 0.55);
}

.gal-item:hover .cover {
  border-color: rgba(26, 23, 20, 0.32);
  box-shadow: 0 26px 60px -34px rgba(26, 23, 20, 0.5);
  transform: translateY(-2px);
}

.gal-item:hover .cover img { transform: scale(1.028); }
.cover svg { display: none; }

.cover .tag {
  top: 12px;
  left: 12px;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(21, 18, 15, 0.82);
  color: #F3EEE5;
  border: none;
  backdrop-filter: blur(4px);
}

.gal-item .cat-line {
  margin-top: 18px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 10.5px;
}

.gal-item h2 {
  font-size: 23px;
  font-weight: 600;
  letter-spacing: -0.022em;
  margin-top: 10px;
}

.gal-item .sub { font-size: 13.5px; color: var(--ink-2); }

.gal-item .fig {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-top: 1px solid var(--rule-soft);
}

/* ---------- 深墨对比带 ---------- */

.band-dark {
  position: relative;
  left: 50%;
  width: 100vw;
  transform: translateX(-50%);
  margin: 96px 0 0;
  background: var(--ink-deep);
  color: #EFE7D9;
  padding: 68px 0 64px;
}

.band-dark .shell { padding: 0 40px; }

.band-dark .kicker { color: rgba(239, 231, 217, 0.5); }
.band-dark .kicker::after { background: rgba(239, 231, 217, 0.16); }

.band-dark h2 {
  margin: 22px 0 0;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.028em;
  font-weight: 600;
  max-width: 22em;
}

.band-dark p {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(239, 231, 217, 0.72);
}

.band-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid rgba(239, 231, 217, 0.16);
}

.band-grid dt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(239, 231, 217, 0.5);
}

.band-grid dd {
  margin: 10px 0 0;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.band-grid dd small {
  display: block;
  margin-top: 8px;
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 400;
  letter-spacing: 0;
  color: rgba(239, 231, 217, 0.6);
  line-height: 1.6;
}

/* ---------- 案例页界面图 ---------- */

.shot {
  margin: 48px 0 0;
  padding: 0;
}

.shot .frame {
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  background: var(--paper-raised);
  box-shadow: 0 30px 70px -40px rgba(26, 23, 20, 0.55);
}

.shot img { display: block; width: 100%; height: auto; }

.shot--phone .frame {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 56px 0;
  background:
    radial-gradient(120% 100% at 50% 0%, #F1EADD 0%, #DDD2BE 100%);
}

.shot--phone img {
  width: auto;
  max-width: 336px;
  border-radius: 22px;
  border: 1px solid rgba(26, 23, 20, 0.16);
  box-shadow: 0 26px 60px -24px rgba(26, 23, 20, 0.5);
}

.shot figcaption {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--rule-soft);
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.65;
}

.shot figcaption b {
  font-weight: 500;
  color: var(--ink-2);
}

.shot figcaption span {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-3);
}

.case-meta {
  border-top: 1px solid var(--rule);
  padding-top: 18px;
  margin-top: 36px;
}

/* ---------- 收尾 ---------- */

.gal-next {
  margin-top: 64px;
}

.foot {
  margin-top: 88px;
  border-top: 1px solid var(--rule);
}

.foot-name { font-weight: 600; letter-spacing: -0.015em; }

.btn {
  border-radius: 999px;
  height: 46px;
  padding: 0 24px;
  font-size: 13.5px;
  letter-spacing: 0.005em;
  background: var(--ink-deep);
}

/* ---------- 入场 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 620ms var(--ease-out), transform 620ms var(--ease-out);
}

.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .gal-item:hover .cover,
  .gal-item:hover .cover img { transform: none; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .shell { padding: 0 24px; }
  .band-dark .shell { padding: 0 24px; }
  .mast { padding: 48px 0 26px; }
  .mast h1 { font-size: clamp(32px, 9vw, 44px); letter-spacing: -0.028em; }
  .case-top { padding: 48px 0 0; }
  .gal { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .gal-item h2 { font-size: 21px; }
  .band-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .band-grid dd { font-size: 22px; }
  .shot--phone .frame { padding: 36px 0; }
  .shot--phone img { max-width: 268px; }
  .gal-tools { position: static; }
  .nav a[aria-current="page"] { background: none; color: var(--ink); }
  .brand span { display: none; }
}

@media (max-width: 560px) {
  .cover { aspect-ratio: 5 / 4; }
  .cover .tag { font-size: 10px; }
}