/* ============================================================================
   无限摄影社 · 基础层 Base
   重置 + 排版 + 光场背景 + 滚动条 + 通用原子类
   ========================================================================== */

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

* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--text-1);
  background: var(--ink-1000);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  overscroll-behavior-y: none;
}

/* 锁定滚动（模态/灯箱打开时） */
body.is-locked { overflow: hidden; }

img, picture, video, canvas, svg { display: block; max-width: 100%; }
img { height: auto; }

input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--red-500);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}
:focus:not(:focus-visible) { outline: none; }

::selection {
  background: rgba(200, 16, 46, .38);
  color: #fff;
}

/* ── 背景光场：通透感的第一层 ─────────────────────────────────────
   三枚巨大的高斯模糊光斑（红 / 银 / 冷青）在墨色底上缓慢游移，
   为所有上层玻璃提供"可被透视的内容"，玻璃才显得透。            */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg);
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 50% -10%, #16161F 0%, #0A0A10 45%, #040406 100%);
}
.bg-field__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .55;
  will-change: transform;
}
.bg-field__orb--red {
  width: 46vw; height: 46vw; min-width: 380px; min-height: 380px;
  top: -14vw; right: -8vw;
  background: radial-gradient(circle at 40% 40%, rgba(200,16,46,.72), rgba(200,16,46,0) 68%);
  animation: orbDrift1 34s var(--ease-in-out) infinite alternate;
}
.bg-field__orb--silver {
  width: 52vw; height: 52vw; min-width: 420px; min-height: 420px;
  bottom: -22vw; left: -14vw;
  background: radial-gradient(circle at 50% 50%, rgba(168,178,196,.42), rgba(168,178,196,0) 70%);
  animation: orbDrift2 42s var(--ease-in-out) infinite alternate;
}
.bg-field__orb--cyan {
  width: 34vw; height: 34vw; min-width: 280px; min-height: 280px;
  top: 38%; left: 44%;
  background: radial-gradient(circle at 50% 50%, rgba(74,144,196,.30), rgba(74,144,196,0) 70%);
  animation: orbDrift3 50s var(--ease-in-out) infinite alternate;
}
@keyframes orbDrift1 {
  from { transform: translate3d(0,0,0) scale(1); }
  to   { transform: translate3d(-9vw, 8vh, 0) scale(1.16); }
}
@keyframes orbDrift2 {
  from { transform: translate3d(0,0,0) scale(1.08); }
  to   { transform: translate3d(11vw, -9vh, 0) scale(.94); }
}
@keyframes orbDrift3 {
  from { transform: translate3d(0,0,0) scale(.92); }
  to   { transform: translate3d(-7vw, -11vh, 0) scale(1.18); }
}

/* 细噪点：消除大面积渐变的"塑料感"，让玻璃有真实的磨砂质地 */
.bg-field__grain {
  position: absolute;
  inset: -50%;
  opacity: .038;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grainShift 6s steps(6) infinite;
}
@keyframes grainShift {
  0%,100% { transform: translate(0,0); }
  20% { transform: translate(-3%, 2%); }
  40% { transform: translate(2%, -3%); }
  60% { transform: translate(-2%, -2%); }
  80% { transform: translate(3%, 1%); }
}

/* 极细网格：暗房 / 取景器网格的隐喻，极低透明度 */
.bg-field__grid {
  position: absolute;
  inset: 0;
  opacity: .5;
  background-image:
    linear-gradient(rgba(255,255,255,.016) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.016) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 20%, transparent 78%);
}

/* 鼠标跟随光晕（PC，由 JS 写入 --mx/--my） */
.bg-field__spot {
  position: absolute;
  width: 620px; height: 620px;
  left: var(--mx, 50%); top: var(--my, 30%);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,.055), rgba(255,255,255,0) 62%);
  transition: left .36s var(--ease-out), top .36s var(--ease-out);
}

/* ── 排版 ─────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--text-1);
}

/* 呼应 LOGO「永無止鏡」的斜体粗黑标题 */
.display {
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.03em;
  transform: skewX(-1.2deg);
}

/* 金属质感文字：模拟 LOGO 的银色立体字 */
.text-metal {
  background: var(--metal-chrome);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: metalSweep 7s linear infinite;
  filter: drop-shadow(0 2px 10px rgba(0,0,0,.5));
}
@keyframes metalSweep {
  0%   { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

.text-red { color: var(--red-500); }
.text-dim { color: var(--text-2); }
.text-faint { color: var(--text-3); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.eyebrow {
  font-size: var(--fs-2xs);
  font-weight: 700;
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--red-400);
}

/* ── 滚动条 ───────────────────────────────────────────────────── */
* { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.16) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.14);
  border-radius: var(--r-full);
  border: 3px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.26); background-clip: content-box; }

/* ── 原子工具类 ───────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.stack   { display: flex; flex-direction: column; }
.row     { display: flex; align-items: center; }
.row-top { display: flex; align-items: flex-start; }
.between { justify-content: space-between; }
.center  { justify-content: center; align-items: center; }
.wrap    { flex-wrap: wrap; }
.grow    { flex: 1 1 auto; min-width: 0; }
.gap-1 { gap: var(--sp-1); } .gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); } .gap-4 { gap: var(--sp-4); }
.gap-5 { gap: var(--sp-5); } .gap-6 { gap: var(--sp-6); }
.gap-8 { gap: var(--sp-8); }
.mt-2 { margin-top: var(--sp-2); } .mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-4); } .mt-6 { margin-top: var(--sp-6); }
.mt-8 { margin-top: var(--sp-8); } .mt-10 { margin-top: var(--sp-10); }
.mb-2 { margin-bottom: var(--sp-2); } .mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.tc { text-align: center; } .tr { text-align: right; }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.clamp-4 { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.divider { height: 1px; background: var(--stroke-1); border: 0; }

/* ∞ 无限分隔线：把 LOGO 母题变成排版元素 */
.divider-infinity {
  display: flex; align-items: center; gap: var(--sp-4);
  color: var(--text-4);
}
.divider-infinity::before,
.divider-infinity::after {
  content: ""; flex: 1; height: 1px;
  background: linear-gradient(90deg, transparent, var(--stroke-2), transparent);
}

/* 页面进入动画 */
@keyframes viewIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes riseIn {
  from { opacity: 0; transform: translateY(22px) scale(.985); }
  to   { opacity: 1; transform: none; }
}
@keyframes popIn {
  from { opacity: 0; transform: translateY(10px) scale(.96); }
  to   { opacity: 1; transform: none; }
}
@keyframes spinInfinity { to { transform: rotate(360deg); } }
@keyframes pulseRed {
  0%,100% { box-shadow: 0 0 0 0 rgba(200,16,46,.55); }
  70%     { box-shadow: 0 0 0 12px rgba(200,16,46,0); }
}
@keyframes shimmer {
  from { background-position: -220% 0; }
  to   { background-position: 220% 0; }
}

.reveal { opacity: 0; transform: translateY(18px); }
.reveal.is-in {
  opacity: 1; transform: none;
  transition: opacity var(--dur-slower) var(--ease-out),
              transform var(--dur-slower) var(--ease-out);
}