/* Qiji (明朝体木刻风) — 本地 qiji-subset.woff2 */
@font-face {
  font-family: 'Qiji';
  src: url('/fonts/qiji-subset.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --color-ink: #1f1d1a;
  --color-ink-soft: rgba(31, 29, 26, 0.78);
  --color-ink-dim: rgba(31, 29, 26, 0.48);
  --color-paper: #f5efe4;
  --color-rust: #b85c3a;
  --color-gold: #c19a5b;

  --font-display: 'Qiji', 'Huiwen Mincho', 'Songti SC', 'STSong', 'SimSun', 'Noto Serif SC', serif;
  --font-body: 'Qiji', 'Huiwen Mincho', 'Songti SC', 'STSong', 'SimSun', 'Noto Serif SC', serif;

  /* 齐伋体墨迹占字身框 66% (宋体 ≈ 84%) → 字号补偿系数 1.27 */
  --qiji-k: 1.27;

  --leading: 1.8;
  --tracking: 0.06em;
}

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

img {
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  pointer-events: none;
}

html, body {
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  background: #d8d4cc;
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: var(--leading);
  user-select: none;
  -webkit-user-select: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 全屏背景:cover + object-position: center bottom (裁天空留地面) */
.stage {
  position: relative;
  width: 100vw;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  background-color: #c9bda0;
  background-image:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.12) 0%, transparent 60%),
    radial-gradient(circle at 80% 80%, rgba(0,0,0,0.06) 0%, transparent 60%);
}

.bg-picture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  margin: 0;
  pointer-events: none;
}

.bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
  display: block;
  animation: image-zoom 30s ease-out forwards;
  will-change: transform;
}

@keyframes image-zoom {
  from { transform: scale(1.0); }
  to   { transform: scale(1.04); }
}

/* 仿宣纸薄纹理覆盖 */
.stage::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.18) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0,0,0,0.06) 0%, transparent 50%);
  pointer-events: none;
  mix-blend-mode: overlay;
  z-index: 1;
}

/* 左上文字浮层 — 放在天空侧不挡远山 */
.text-overlay {
  position: absolute;
  top: clamp(48px, 8vh, 96px);
  left: clamp(48px, 8vw, 120px);
  z-index: 2;
  pointer-events: none;
}

.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;
}

/* 主标题: 但"虚"that远山长, 云山乱, 晓山青 — 纯 CSS 竖排
   flex-row-reverse 让先入列字符在右 (读序右→左); writing-mode: vertical-rl 列内字符自上而下 */
.verse {
  display: flex;
  flex-direction: row-reverse;
  justify-content: flex-end;
  align-items: flex-start;
  gap: 0.26em;
  --glyph: clamp(32px, 3.2vw, 46px);
  --char-pad: 0.09em;
  font-size: var(--glyph);
  pointer-events: auto;
  cursor: crosshair;
  user-select: none;
}

.verse-col {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: var(--glyph);
  line-height: 1;
  display: block;
}

.verse .char {
  display: inline-block;
  font-weight: 400;
  color: var(--color-ink);
  padding: var(--char-pad) 0;
  margin: 0;
  text-shadow: 0 1px 0 rgba(255,255,255,0.4);
  transition: color 0.35s ease, opacity 0.35s ease;
}

.verse .char.punct { color: var(--color-ink-dim); }

.verse .char.group-active {
  color: var(--color-rust);
  opacity: 0.82;
}

.verse .char.group-near {
  color: var(--color-rust);
  animation: tremble 1.6s ease-in-out infinite;
  animation-delay: var(--d, 0s);
}

.verse .char.group-very-near {
  color: var(--color-rust);
  animation: tremble-strong 0.8s ease-in-out infinite;
  animation-delay: var(--d, 0s);
}

.verse .char.touched {
  animation: ripple 0.9s cubic-bezier(0.2, 0.7, 0.3, 1.4);
  animation-delay: var(--d, 0s);
  color: var(--color-rust);
}

/* 竖排下 transform 跟 writing-mode 打架 → 只用 translate */
@keyframes tremble {
  0%, 100% { transform: translateX(0) translateY(0); }
  50%      { transform: translateX(1px) translateY(0.6px); }
}

@keyframes tremble-strong {
  0%, 100% { transform: translateX(0) translateY(0); }
  25%      { transform: translateX(2px) translateY(-1.4px); }
  75%      { transform: translateX(-1.6px) translateY(1.4px); }
}

@keyframes ripple {
  0%   { transform: translateX(0) translateY(0); }
  35%  { transform: translateX(4px) translateY(-5px); }
  65%  { transform: translateX(-3px) translateY(3px); }
  100% { transform: translateX(0) translateY(0); }
}

/* 落款 / 印章 */
.signature {
  margin-top: clamp(24px, 4vh, 40px);
  display: flex;
  align-items: center;
  gap: 14px;
  pointer-events: auto;
}

.signature .seal {
  width: clamp(32px, 3vw, 40px);
  height: clamp(32px, 3vw, 40px);
  border: 1.5px solid var(--color-rust);
  color: var(--color-rust);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: calc(clamp(18px, 2vw, 24px) * var(--qiji-k));
  font-weight: 600;
  flex-shrink: 0;
}

.signature .meta {
  font-family: var(--font-display);
  font-size: calc(clamp(11px, 1.1vw, 13px) * var(--qiji-k));
  letter-spacing: 0.18em;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

.signature .meta .title {
  display: block;
  font-size: calc(clamp(13px, 1.4vw, 16px) * var(--qiji-k));
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}

/* 右下水印 */
.corner-mark {
  position: absolute;
  bottom: clamp(20px, 3vh, 36px);
  right: clamp(20px, 3vw, 48px);
  font-family: var(--font-display);
  font-size: calc(clamp(11px, 1.1vw, 13px) * var(--qiji-k));
  letter-spacing: 0.2em;
  color: rgba(31, 29, 26, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 8px 14px;
  background: rgba(245, 239, 228, 0.45);
  border-radius: 2px;
  z-index:2;
  text-align: right;
}

.corner-mark .top {
  display: block;
  font-size: clamp(10px, 1vw, 11px);
  color: rgba(31, 29, 26, 0.45);
  margin-bottom: 2px;
}

/* 移动端竖屏: 完整显示图片 */
@media (max-width: 768px) {
  .text-overlay { top: 32px; left: 28px; }
  .verse { --glyph: 30px; --char-pad: 0.1em; }
  .signature { margin-top: 20px; }
  .signature .meta { font-size: calc(10px * var(--qiji-k)); }
  .signature .meta .title { font-size: calc(12px * var(--qiji-k)); }
  .signature .seal { font-size: calc(17px * var(--qiji-k)); }
}

.stage.mobile-mode .bg-image {
  object-fit: contain;
  object-position: center center;
}

/* prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .verse .char, .verse .char.group-near, .verse .char.group-very-near, .verse .char.touched {
    animation: none !important;
  }
  .bg-image { animation: none; }
}