/* ================= 基础 ================= */
:root {
  --ink: #1c1c1e;
  --ink-soft: #3d3d40;
  --pink: #f2a9d4;
  --mint: #bff2dd;
  --maxw: 1440px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; }

/* ================= 顶部 ================= */
.site-header {
  display: flex;
  align-items: stretch;
  width: 100%;
}

.logo-box {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8px 22px 8px 32px;
  background: #fff;
}

.logo {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.logo-text {
  font-weight: 800;
  font-size: 19px;
  line-height: .95;
  letter-spacing: .5px;
  font-family: "Arial Black", "Segoe UI", Arial, sans-serif;
}

.wave {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 28px;
  padding-bottom: 2px;
}
.wave i { width: 4px; background: #111; border-radius: 3px; }
.wave i:nth-child(1) { height: 8px; }
.wave i:nth-child(2) { height: 14px; }
.wave i:nth-child(3) { height: 22px; }
.wave i:nth-child(4) { height: 12px; }
.wave i:nth-child(5) { height: 26px; }
.wave i:nth-child(6) { height: 17px; }
.wave i:nth-child(7) { height: 9px; }

.tagline {
  margin: 3px 0 0;
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 1.4px;
}

.top-nav {
  flex: 1 1 auto;
  display: flex;
  background: linear-gradient(90deg, var(--mint) 0%, #eef0d8 30%, #f7cdea 62%, #f3b0de 100%);
}

.top-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1px;
  padding: 8px 10px;
  text-decoration: none;
  text-align: center;
}
.top-nav a:hover .zh { text-decoration: underline; text-underline-offset: 4px; }

.top-nav .zh { font-size: 15px; font-weight: 700; color: #17171a; }
.top-nav .en { font-size: 11px; color: #3c3c42; }

/* 导航色块：未选中的保持青绿，当前页的呈现粉色 */
.top-nav.nav-blocks { background: none; }

.top-nav.nav-blocks a {
  background: var(--mint);
  padding: 8px 12px;
  transition: background .15s ease;
}
.top-nav.nav-blocks a:not(.is-active):hover { background: #a9ecd3; }

.top-nav.nav-blocks a.is-active { background: #f9c6e4; }
.top-nav.nav-blocks a.is-active:hover { background: #f6b1d9; }

/* ================= 主体 ================= */
.main {
  display: grid;
  grid-template-columns: minmax(300px, 480px) 1fr;
  gap: 30px;
  width: 100%;
  padding: 60px clamp(24px, 4.5vw, 80px) 90px;
  min-height: 600px;
}

.copy { padding-top: 90px; }

.copy h1 {
  margin: 0 0 70px;
  font-size: 31px;
  line-height: 1.55;
  font-weight: 700;
  letter-spacing: .5px;
}

.copy .who {
  margin: 0 0 14px;
  font-size: 15.5px;
  color: var(--ink-soft);
  max-width: 380px;
}

.who-link {
  font-size: 11.5px;
  color: #6a6a6e;
  word-break: break-all;
}

/* ================= 磁带舞台 ================= */
.stage {
  position: relative;
  min-height: 560px;
}

.cassette {
  position: absolute;
  display: block;
  width: var(--w, 190px);
  transform: rotate(var(--r, 0deg));
  filter: drop-shadow(0 16px 22px rgba(0, 0, 0, .18));
  transition: filter .2s ease;
  animation: drift var(--d, 8s) ease-in-out var(--dl, 0s) infinite alternate;
  z-index: 1;
}
.cassette:hover {
  filter: drop-shadow(0 22px 30px rgba(0, 0, 0, .26));
  z-index: 9;
}
.cassette:focus-visible {
  outline: 3px solid var(--pink);
  outline-offset: 4px;
  border-radius: 10px;
}

@keyframes drift {
  from { translate: 0 0; }
  to   { translate: var(--dx, 0px) var(--dy, 0px); }
}

.shell {
  display: block;
  position: relative;
  width: 100%;
  aspect-ratio: 100 / 62;
  border-radius: 9px;
  background: var(--cs);
  border: 1px solid var(--cb);
  transition: scale .2s ease;
}
.cassette:hover .shell { scale: 1.05; }

/* 真实图片磁带（透明底 PNG） */
.tape-img {
  display: block;
  width: 100%;
  height: auto;
  transition: scale .2s ease;
}
.cassette.is-img:hover .tape-img { scale: 1.05; }

/* 螺丝 */
.shell::before,
.shell::after {
  content: "";
  position: absolute;
  bottom: 9%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--screw, #d4d4d8);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, .1);
}
.shell::before { left: 5%; }
.shell::after { right: 5%; }

/* 标签面 */
.face {
  position: absolute;
  left: 5%;
  right: 5%;
  top: 8%;
  height: 58%;
  border-radius: 5px;
  background: var(--lb);
  overflow: hidden;
}

.face .brand {
  position: absolute;
  top: 7%;
  left: 6%;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--lt);
  white-space: nowrap;
}

.face .sub {
  position: absolute;
  bottom: 6%;
  left: 6%;
  font-size: 8.5px;
  letter-spacing: .08em;
  color: var(--lt);
  opacity: .8;
  white-space: nowrap;
}

.face .stripe {
  position: absolute;
  top: 36%;
  left: 0;
  right: 0;
  height: 20%;
  background: var(--ls, none);
}

.face .badge {
  position: absolute;
  top: 6%;
  right: 5%;
  font-size: 9px;
  font-weight: 800;
  color: var(--lt);
  border: 1.5px solid currentColor;
  border-radius: 3px;
  padding: 0 4px;
  line-height: 1.5;
}

/* 带轮 */
.spool {
  position: absolute;
  top: 66%;
  width: 30%;
  aspect-ratio: 1;
  transform: translateY(-50%);
  border-radius: 50%;
  background: #f2f1ee;
  box-shadow: inset 0 0 0 3px rgba(0, 0, 0, .12);
}
.spool::after {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: 50%;
  background: var(--hole, #2b2b2e);
}
.spool.s1 { left: 13%; }
.spool.s2 { right: 13%; }

/* 底部梯形 */
.foot {
  position: absolute;
  left: 24%;
  right: 24%;
  bottom: 5%;
  height: 24%;
  background: var(--cs);
  border-radius: 4px;
  clip-path: polygon(7% 0, 93% 0, 100% 100%, 0 100%);
}

/* ---- 配色变体 ---- */
.v-smoke {
  --cs: rgba(66, 68, 74, .88);
  --cb: #3a3c42;
  --lb: #eceae4;
  --lt: #47474c;
  --ls: linear-gradient(90deg, #e2703a 0 62%, #e8e6e0 62% 100%);
  --screw: #a9a9af;
}

.v-pink {
  --cs: #f5b8d9;
  --cb: #e09cc3;
  --lb: #fcdcec;
  --lt: #bd6397;
  --ls: linear-gradient(90deg, #f2a0c8 0 40%, #fbd9ea 40% 100%);
}

.v-black {
  --cs: linear-gradient(145deg, #232427, #101114);
  --cb: #000;
  --lb: #f1eee6;
  --lt: #2c2c2e;
  --ls: linear-gradient(90deg, #3fb8af 0 33%, #f2b134 33% 66%, #ef6ea0 66% 100%);
  --screw: #55565c;
}

.v-cream {
  --cs: #ece5d2;
  --cb: #d6cdb6;
  --lb: #f6f1e4;
  --lt: #b8382e;
  --ls: linear-gradient(180deg, #c8392c 0 55%, #e8e2d2 55% 100%);
}

.v-photo {
  --cs: #7d8a80;
  --cb: #5d6b62;
}
.v-photo .face {
  background:
    radial-gradient(60% 50% at 22% 30%, rgba(154, 168, 150, .9), transparent 70%),
    radial-gradient(50% 60% at 78% 70%, rgba(90, 104, 96, .9), transparent 70%),
    linear-gradient(160deg, #9aa89c 0%, #77857a 48%, #57655c 100%);
}
.v-photo .brand, .v-photo .stripe, .v-photo .badge { display: none; }
.v-photo .spool { background: #31382f; box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .25); }
.v-photo .spool::after { background: #1d221e; }

/* ---- 摆位 ---- */
/* 九盘磁带收成上部一簇，彼此遮盖更多，不再向下铺开 */
.p1 { --w: 280px; --r: -1deg;   --d: 4.8s; --dx: 72px; --dy: -32px; --dl: -1s;   top: 0;   left: 22%; z-index: 2; }
.p2 { --w: 280px; --r: 2deg;    --d: 6.0s; --dx: -64px; --dy: 30px; --dl: -3s;   top: 2%;  left: 42%; z-index: 3; }
.p3 { --w: 280px; --r: -1.5deg; --d: 5.4s; --dx: -88px; --dy: -26px; --dl: -2s;  top: 14%; left: 30%; z-index: 4; }
.p4 { --w: 280px; --r: .5deg;   --d: 4.5s; --dx: 60px;  --dy: 38px; --dl: -4s;   top: 18%; left: 56%; z-index: 3; }
.p5 { --w: 280px; --r: -2deg;   --d: 6.6s; --dx: 92px;  --dy: -34px; --dl: -5s;  top: 30%; left: 8%;  z-index: 5; }
.p6 { --w: 280px; --r: 1deg;    --d: 5.1s; --dx: -70px; --dy: 34px; --dl: -2.5s; top: 32%; left: 34%; z-index: 4; }
.p7 { --w: 280px; --r: -1deg;   --d: 5.7s; --dx: -80px; --dy: -30px; --dl: -6s;  top: 44%; left: 18%; z-index: 6; }
.p8 { --w: 280px; --r: 2.5deg;  --d: 6.3s; --dx: 66px;  --dy: 36px; --dl: -3.5s; top: 46%; left: 44%; z-index: 7; }
.p9 { --w: 280px; --r: -2deg;   --d: 7.2s; --dx: -76px; --dy: 28px; --dl: -7s;   top: 36%; left: 62%; z-index: 3; }

/* ================= 语言切换（右上角柔光胶囊） ================= */
.lang-switch {
  position: fixed;
  top: 82px;
  right: 28px;
  bottom: auto;
  left: auto;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 4px;
  background: linear-gradient(90deg, #fdf2f9 0%, #ffffff 50%, #f0faf3 100%);
  border-radius: 999px;
  padding: 6px 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .07);
}

/* 左右两侧的柔光晕（左粉右绿） */
.lang-switch::before,
.lang-switch::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(16px);
  z-index: -1;
}
.lang-switch::before {
  left: -42px;
  translate: 0 -50%;
  background: radial-gradient(circle, rgba(246, 170, 220, .8) 0%, rgba(246, 170, 220, 0) 68%);
}
.lang-switch::after {
  right: -42px;
  translate: 0 -50%;
  background: radial-gradient(circle, rgba(150, 232, 180, .75) 0%, rgba(150, 232, 180, 0) 68%);
}

/* 中间的粉绿渐变光点 */
.lang-dot {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  margin: 0 -8px;
  background: radial-gradient(circle,
    #86e7ab 0 30%,
    #ee9ed3 52%,
    rgba(238, 158, 211, 0) 74%);
  filter: blur(6px);
  pointer-events: none;
}

.lang-btn {
  position: relative;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 13px;
  color: #55555c;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
}
.lang-btn.active {
  color: #1c1c1e;
  font-weight: 700;
}

/* ================= 响应式 ================= */
@media (max-width: 1100px) {
  .main { grid-template-columns: 1fr; padding-top: 36px; }
  .copy { padding-top: 10px; }
  .copy h1 { margin-bottom: 40px; }
  .stage {
    min-height: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 26px 18px;
    align-items: center;
    justify-items: center;
    padding: 20px 0 30px;
  }
  .cassette {
    position: static;
    width: min(var(--w), 100%);
    max-width: 240px;
  }
}

@media (max-width: 720px) {
  .site-header { flex-direction: column; }
  .logo-box { padding: 10px 150px 10px 20px; }
  .top-nav { border-top: 1px solid rgba(0, 0, 0, .05); }
  .top-nav .zh { font-size: 14px; }
  .top-nav .en { font-size: 10px; }
  .main { padding: 26px 20px 80px; }
  .copy h1 { font-size: 23px; }
  .stage { grid-template-columns: 1fr 1fr; gap: 18px 12px; }
  .lang-switch { top: 14px; right: 14px; bottom: auto; left: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .cassette { animation: none; }
}