/* ==========================================================================
   丰川祥子大学.work — 入场门面
   风格：剧场幕布 / 暗黑金属 / 假面
   ========================================================================== */

:root {
  --black: #050506;
  --black-2: #0b0b0f;
  --black-3: #131318;
  --crimson: #8f1220;
  --crimson-lit: #c8172c;
  --crimson-deep: #4a0710;
  --silver: #c9c7c2;
  --silver-2: #8d8b88;
  --silver-3: #5c5b59;
  --ink: #ebe8e1;

  --serif: "Cinzel", "Trajan Pro", "Bodoni MT", "Didot", "Times New Roman",
    "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --sans: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;

  --wrap: min(1120px, 100vw - 3rem);
  --tick: 1s;
}

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

html,
body {
  height: 100%;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--black);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--crimson);
  color: #fff;
}

/* --------------------------------------------------------------------------
   1. 舞台背景层
   -------------------------------------------------------------------------- */

.stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

/* 幕布：垂直褶皱 + 顶部压暗 */
.stage__curtain {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      180deg,
      rgba(0, 0, 0, 0.96) 0%,
      rgba(5, 5, 6, 0.65) 22%,
      rgba(5, 5, 6, 0.1) 50%,
      rgba(0, 0, 0, 0.82) 82%,
      #000 100%
    ),
    repeating-linear-gradient(
      90deg,
      #0a0a0d 0px,
      #0a0a0d 46px,
      #100a0c 62px,
      #060607 96px
    );
  opacity: 0.98;
}

/* 舞台聚光：缓慢明灭 */
.stage__spot {
  position: absolute;
  inset: -30% -10%;
  background: radial-gradient(
    46% 42% at 50% 30%,
    rgba(200, 23, 44, 0.2) 0%,
    rgba(143, 18, 32, 0.09) 38%,
    rgba(0, 0, 0, 0) 72%
  );
  filter: blur(12px);
  animation: breathe 8s ease-in-out infinite;
}

/* 地面血雾 */
.stage__fog {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -18%;
  height: 62%;
  background: radial-gradient(
    58% 100% at 50% 100%,
    rgba(143, 18, 32, 0.3) 0%,
    rgba(74, 7, 16, 0.14) 45%,
    rgba(0, 0, 0, 0) 78%
  );
  filter: blur(26px);
  animation: drift 16s ease-in-out infinite;
}

/* 颗粒噪点 */
.stage__grain {
  position: absolute;
  inset: -50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.05;
  animation: grain 1.1s steps(3) infinite;
  pointer-events: none;
}

/* 暗角 */
.stage__vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    74% 68% at 50% 44%,
    rgba(0, 0, 0, 0) 42%,
    rgba(0, 0, 0, 0.72) 100%
  );
}

/* 扫描线 */
.stage__scan {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.028) 0px,
    rgba(255, 255, 255, 0.028) 1px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0) 4px
  );
  mix-blend-mode: overlay;
  opacity: 0.5;
}

@keyframes breathe {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.06);
  }
}

@keyframes drift {
  0%,
  100% {
    opacity: 0.7;
    transform: translate3d(-2%, 0, 0);
  }
  50% {
    opacity: 1;
    transform: translate3d(2%, -2%, 0);
  }
}

@keyframes grain {
  0% {
    transform: translate(0, 0);
  }
  33% {
    transform: translate(-3%, 2%);
  }
  66% {
    transform: translate(2%, -3%);
  }
  100% {
    transform: translate(0, 0);
  }
}

/* --------------------------------------------------------------------------
   2. 顶栏
   -------------------------------------------------------------------------- */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem clamp(1rem, 4vw, 2.75rem);
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0));
  pointer-events: none;
}

.topbar__left,
.topbar__right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  pointer-events: auto;
}

.topbar__mark {
  width: 26px;
  height: 26px;
  flex: none;
  color: var(--crimson-lit);
  filter: drop-shadow(0 0 6px rgba(200, 23, 44, 0.55));
}

.topbar__latin {
  font-family: var(--serif);
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--silver-2);
}

.topbar__tag {
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--silver-3);
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   3. 主体
   -------------------------------------------------------------------------- */

.gate {
  position: relative;
  z-index: 5;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1rem, 2.4vh, 1.9rem);
  padding: clamp(4.5rem, 11vh, 7rem) clamp(1.25rem, 4vw, 3rem)
    clamp(3rem, 8vh, 5rem);
  text-align: center;
}

/* 入场编排 */
.gate[data-state="loading"] .reveal {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
}

.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--delay, 0s);
}

/* 纹章 */
.emblem {
  width: clamp(96px, 15vh, 152px);
  height: auto;
  color: var(--silver);
  filter: drop-shadow(0 0 22px rgba(200, 23, 44, 0.28));
}

.emblem .emblem__vein {
  animation: vein 7s ease-in-out infinite;
}

@keyframes vein {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 1;
  }
}

/* 校名 */
.title {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.title__latin {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(0.82rem, 1.9vw, 1.02rem);
  letter-spacing: clamp(0.4em, 1.6vw, 0.72em);
  text-indent: clamp(0.4em, 1.6vw, 0.72em);
  text-transform: uppercase;
  color: var(--silver-2);
}

.title__cn {
  position: relative;
  display: block;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 5.4vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: 0.08em;
  text-indent: 0.08em;
  white-space: nowrap;
  background: linear-gradient(
    176deg,
    #ffffff 0%,
    #d9d6d0 22%,
    #8b8985 46%,
    #f2efe8 54%,
    #6d6b68 72%,
    #c9c7c2 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 3px 0 rgba(0, 0, 0, 0.85))
    drop-shadow(0 0 30px rgba(200, 23, 44, 0.22));
}

/* 校名下的血线 */
.title__rule {
  display: block;
  width: clamp(140px, 26vw, 280px);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--crimson) 22%,
    var(--crimson-lit) 50%,
    var(--crimson) 78%,
    transparent
  );
  box-shadow: 0 0 12px rgba(200, 23, 44, 0.55);
}

/* 声明 */
.manifesto {
  margin: 0;
  max-width: 44rem;
  font-size: clamp(0.9rem, 2.1vw, 1.04rem);
  line-height: 2.05;
  color: #b4b1ab;
}

.manifesto strong {
  color: var(--ink);
  font-weight: 600;
}

.manifesto em {
  font-style: normal;
  color: var(--crimson-lit);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   4. 入口台：倒计时环 + 圆钮
   -------------------------------------------------------------------------- */

.portal {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0.8rem, 2vh, 1.4rem);
  margin-top: clamp(0.2rem, 1.4vh, 1rem);
}

.ring {
  position: relative;
  width: clamp(132px, 21vh, 186px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}

.ring__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring__track {
  fill: none;
  stroke: rgba(201, 199, 194, 0.14);
  stroke-width: 1.4;
}

.ring__progress {
  fill: none;
  stroke: url(#ringgrad);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-dasharray: var(--circ, 326.7);
  stroke-dashoffset: var(--offset, 0);
  transition: stroke-dashoffset var(--tick) linear;
  filter: drop-shadow(0 0 6px rgba(200, 23, 44, 0.75));
}

.ring__core {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.ring__num {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.6rem, 7.4vh, 3.9rem);
  line-height: 1;
  color: var(--ink);
  text-shadow: 0 0 26px rgba(200, 23, 44, 0.42);
  font-variant-numeric: tabular-nums;
}

.ring__unit {
  font-size: 0.62rem;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  color: var(--silver-3);
}

.ring__pulse {
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  border: 1px solid rgba(200, 23, 44, 0.32);
  animation: ripple 2.6s ease-out infinite;
  pointer-events: none;
}

.ring__pulse--2 {
  animation-delay: 1.3s;
}

@keyframes ripple {
  0% {
    transform: scale(0.86);
    opacity: 0.85;
  }
  100% {
    transform: scale(1.22);
    opacity: 0;
  }
}

/* 主按钮 */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  padding: 1.02rem clamp(1.6rem, 5vw, 3rem);
  border: 1px solid rgba(200, 23, 44, 0.55);
  background: linear-gradient(
    180deg,
    rgba(200, 23, 44, 0.19) 0%,
    rgba(20, 4, 7, 0.9) 55%,
    rgba(74, 7, 16, 0.75) 100%
  );
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(0.95rem, 2.3vw, 1.12rem);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-indent: 0.16em;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.35s ease, box-shadow 0.35s ease,
    transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 0 0 rgba(200, 23, 44, 0), inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

.btn__arrow {
  width: 1.05em;
  height: 1.05em;
  flex: none;
  transition: transform 0.35s ease;
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--crimson-lit);
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(200, 23, 44, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  outline: none;
}

.btn:hover .btn__arrow,
.btn:focus-visible .btn__arrow {
  transform: translateX(5px);
}

.btn:active {
  transform: translateY(0);
}

.btn--sm {
  padding: 0.72rem clamp(1.1rem, 3.4vw, 1.7rem);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}

/* 按钮金属反光扫过 */
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 42%;
  left: -60%;
  background: linear-gradient(
    100deg,
    transparent,
    rgba(255, 255, 255, 0.16),
    transparent
  );
  animation: sweep 4.4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes sweep {
  0%,
  62% {
    left: -60%;
  }
  92%,
  100% {
    left: 120%;
  }
}

/* 目标信息 */
.target {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  max-width: 40rem;
}

.target__label {
  font-size: 0.64rem;
  letter-spacing: 0.36em;
  text-indent: 0.36em;
  text-transform: uppercase;
  color: var(--silver-3);
}

.target__name {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1rem, 2.6vw, 1.24rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.target__url {
  font-family: var(--serif);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--crimson-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 23, 44, 0.35);
  padding-bottom: 2px;
  transition: color 0.3s ease, border-color 0.3s ease;
  word-break: break-all;
}

.target__url:hover,
.target__url:focus-visible {
  color: #fff;
  border-color: var(--crimson-lit);
  outline: none;
}

/* 兜底提示 */
.fallback {
  margin: 0;
  min-height: 1.4rem;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--silver-2);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.fallback[data-show="true"] {
  opacity: 1;
}

.fallback a {
  color: var(--crimson-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 23, 44, 0.45);
}

.fallback a:hover {
  color: #fff;
  border-color: var(--crimson-lit);
}

/* --------------------------------------------------------------------------
   5. 底栏
   -------------------------------------------------------------------------- */

.foot {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem clamp(1rem, 4vw, 2.75rem);
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0));
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--silver-3);
  pointer-events: none;
}

.foot__note,
.foot__replay {
  pointer-events: auto;
}

.foot__replay {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  letter-spacing: inherit;
  color: var(--silver-3);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: rgba(141, 139, 136, 0.4);
  text-underline-offset: 3px;
  transition: color 0.3s ease;
  flex: none;
}

.foot__replay:hover,
.foot__replay:focus-visible {
  color: var(--crimson-lit);
  outline: none;
}

/* --------------------------------------------------------------------------
   6. 工具类
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   7. 响应式 & 无障碍
   -------------------------------------------------------------------------- */

@media (max-width: 720px) {
  .topbar__tag {
    display: none;
  }

  .topbar__latin {
    letter-spacing: 0.26em;
    font-size: 0.66rem;
  }

  .manifesto {
    line-height: 1.95;
  }

  .foot {
    align-items: center;
    font-size: 0.64rem;
  }
}

@media (max-height: 640px) {
  .emblem {
    width: 78px;
  }

  .ring {
    width: 112px;
  }

  .manifesto {
    font-size: 0.86rem;
    line-height: 1.8;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .ring__progress {
    transition: stroke-dashoffset 1s linear;
  }
}

@media print {
  .stage,
  .topbar,
  .foot {
    display: none;
  }

  body {
    overflow: visible;
    background: #fff;
    color: #000;
  }
}