/* tftf.me — 主站独立主题 */

:root {
  --bg: #121110;
  --text-primary: #c9c4bb;
  --text-secondary: #7a746c;
  --text-muted: #6a645c;
  --portal-line: rgba(180, 168, 150, 0.22);
  --font-zh: "TFTF Seal", serif;
  --zh-track: 0.32em;
  --zh-phrase-gap: clamp(1.25rem, 3.5vw, 2rem);
  --zh-line-height: 2.05;
  --font-en: "Cormorant Garamond", "Georgia", serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --footer-hide-delay: 2.8s;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-en);
  background-color: var(--bg);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 48%, rgba(180, 168, 150, 0.025) 0%, transparent 65%),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.028'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

.page {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1.5rem 5rem;
}

/* ── 左右隐形热区：仅视觉提示，无跳转 ── */
.portal {
  position: fixed;
  top: 0;
  bottom: 0;
  width: clamp(90px, 20vw, 260px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  overflow: hidden;
  cursor: default;
  pointer-events: auto;
}

.portal--left {
  left: 0;
}

.portal--right {
  right: 0;
}

.portal::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 2s var(--ease-soft);
  pointer-events: none;
}

.portal--left::after {
  background: linear-gradient(
    to right,
    rgba(38, 34, 30, 0.72) 0%,
    rgba(30, 27, 24, 0.28) 45%,
    rgba(18, 17, 16, 0.06) 75%,
    transparent 100%
  );
}

.portal--right::after {
  background: linear-gradient(
    to left,
    rgba(36, 32, 28, 0.68) 0%,
    rgba(28, 25, 22, 0.26) 45%,
    rgba(18, 17, 16, 0.05) 75%,
    transparent 100%
  );
}

.portal::before {
  content: "";
  position: absolute;
  top: 18%;
  bottom: 18%;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--portal-line) 25%,
    var(--portal-line) 75%,
    transparent 100%
  );
  opacity: 0;
  transform: scaleY(0.6);
  transform-origin: center;
  transition:
    opacity 2s var(--ease-soft),
    transform 2s var(--ease-out);
}

.portal--left::before {
  right: 0;
}

.portal--right::before {
  left: 0;
}

.portal__hint {
  position: relative;
  z-index: 1;
  font-family: var(--font-en);
  font-size: 0.62rem;
  font-weight: 300;
  letter-spacing: 0.48em;
  text-transform: uppercase;
  color: rgba(180, 168, 150, 0.55);
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 2s var(--ease-soft),
    transform 2s var(--ease-out),
    color 2s var(--ease-soft);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  user-select: none;
}

.portal--left .portal__hint {
  margin-right: 1.4rem;
}

.portal--right .portal__hint {
  margin-left: 1.4rem;
}

.portal:hover::after {
  opacity: 1;
}

.portal:hover::before {
  opacity: 1;
  transform: scaleY(1);
}

.portal:hover .portal__hint {
  opacity: 0.65;
  transform: translateY(0);
  color: rgba(196, 186, 170, 0.7);
}

/* ── 主旨句 ── */
.verse {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0.65rem, 1.8vw, 1rem);
  width: 100%;
  margin: 0;
  padding: 0;
  border: none;
  text-align: center;
}

.verse__zh {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--zh-phrase-gap);
  width: fit-content;
  max-width: 100%;
  margin: 0;
  font-family: var(--font-zh);
  font-size: clamp(1.55rem, 3.8vw, 2.2rem);
  font-weight: normal;
  line-height: var(--zh-line-height);
  color: #d8d2c8;
  margin-bottom: -0.15em;
  opacity: 0.48;
  filter: brightness(0.78);
  animation: breathe-zh 5.5s ease-in-out infinite;
}

.verse__phrase {
  letter-spacing: var(--zh-track);
  margin-right: calc(-1 * var(--zh-track));
  white-space: nowrap;
}

.verse__en {
  width: fit-content;
  max-width: none;
  margin: 0;
  padding: 0 0.5rem;
  font-family: var(--font-en);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.03em;
  margin-right: -0.03em;
  line-height: 1.45;
  white-space: nowrap;
  color: #b5aea3;
  opacity: 0.55;
  filter: brightness(0.88);
  animation: breathe-en 5.5s ease-in-out 0.35s infinite;
}

/* ── 页脚：默认隐藏，悬浮显现，离开后缓隐 ── */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.5rem, 4vw, 2.5rem);
  text-align: center;
  z-index: 5;
}

.footer__text {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 0.85s var(--ease-soft),
    transform 0.85s var(--ease-soft);
  transition-delay: var(--footer-hide-delay);
}

.footer:hover .footer__text {
  opacity: 0.58;
  transform: translateY(0);
  transition-delay: 0.12s;
}

@keyframes breathe-zh {
  0%,
  100% {
    opacity: 0.48;
    filter: brightness(0.78);
    text-shadow: none;
  }
  50% {
    opacity: 1;
    filter: brightness(1.12);
    text-shadow: 0 0 32px rgba(225, 215, 198, 0.42);
  }
}

@keyframes breathe-en {
  0%,
  100% {
    opacity: 0.55;
    filter: brightness(0.88);
    text-shadow: none;
  }
  50% {
    opacity: 1;
    filter: brightness(1.15);
    text-shadow: 0 0 24px rgba(200, 190, 175, 0.38);
  }
}

@media (max-width: 640px) {
  .portal {
    width: 64px;
  }

  .portal__hint {
    font-size: 0.52rem;
    letter-spacing: 0.36em;
  }

  .verse__phrase {
    --zh-track: 0.24em;
  }

  .verse__en {
    font-size: clamp(1.05rem, 4.1vw, 1.38rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .verse__zh,
  .verse__en {
    animation: none;
    opacity: 1;
    filter: none;
    text-shadow: none;
  }

  .footer__text {
    transition-duration: 0.01ms;
    transition-delay: 0ms;
  }

  .portal::after,
  .portal::before,
  .portal__hint {
    transition-duration: 0.01ms;
  }
}