/* ============ 六爻 · 水墨黑白太极 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --ink: #1a1a1a;
  --ink-soft: #555;
  --paper: #f4f1ea;
  --paper-deep: #e8e2d4;
  --line: #3a3a3a;
}

html, body {
  font-family: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', serif;
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 水墨晕染背景 */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(60% 40% at 15% 10%, rgba(0, 0, 0, 0.05), transparent 70%),
    radial-gradient(50% 35% at 90% 20%, rgba(0, 0, 0, 0.04), transparent 70%),
    radial-gradient(70% 45% at 80% 90%, rgba(0, 0, 0, 0.06), transparent 70%),
    radial-gradient(45% 30% at 10% 85%, rgba(0, 0, 0, 0.04), transparent 70%);
}

a { text-decoration: none; color: inherit; }

.container {
  position: relative; z-index: 1;
  max-width: 520px; margin: 0 auto; padding: 20px 20px 48px;
}

/* 顶部返回 */
.top-bar { padding: 6px 0 0; border-bottom: 1px solid rgba(26, 26, 26, 0.25); }
.top-bar .back-link {
  display: inline-block; font-size: 13px; color: var(--ink-soft);
  letter-spacing: 1px; padding: 6px 10px;
}
.top-bar .back-link:active { color: var(--ink); }

/* 头部 */
.hero { text-align: center; padding: 26px 0 20px; }
.taiji {
  position: relative; width: 72px; height: 72px; margin: 0 auto 14px;
  border-radius: 50%; overflow: hidden;
  border: 2px solid var(--ink);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  animation: taijiSpin 14s linear infinite;
}
@keyframes taijiSpin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.taiji-half { position: absolute; width: 50%; height: 100%; }
.taiji-half.white { left: 0; background: #fff; }
.taiji-half.black { right: 0; background: var(--ink); }
.taiji::before, .taiji::after {
  content: ''; position: absolute; width: 50%; height: 50%;
  border-radius: 50%;
}
.taiji::before { left: 0; top: 25%; background: #fff; }
.taiji::after { right: 0; top: 25%; background: var(--ink); }
.dot { position: absolute; width: 11px; height: 11px; border-radius: 50%; }
.dot-black { left: 25%; top: 50%; transform: translate(-50%, -50%); background: var(--ink); z-index: 2; }
.dot-white { right: 25%; top: 50%; transform: translate(50%, -50%); background: #fff; z-index: 2; }

.hero h1 {
  font-size: 34px; letter-spacing: 12px; color: var(--ink);
  font-weight: 700;
}
.hero .sub { font-size: 13px; color: var(--ink-soft); margin-top: 6px; letter-spacing: 3px; }
.hero .intro {
  font-size: 13px; color: var(--ink); line-height: 1.9; margin-top: 14px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(26, 26, 26, 0.2);
  border-radius: 8px; padding: 10px 14px;
}
.disclaimer {
  display: inline-block; margin-top: 12px; padding: 4px 12px;
  font-size: 12px; color: var(--ink-soft);
  border: 1px solid rgba(26, 26, 26, 0.35); border-radius: 20px;
}

.section-title {
  text-align: center; color: var(--ink); font-size: 15px;
  letter-spacing: 6px; margin: 22px 0 16px;
}

/* 摇卦区 */
.cast-box {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(26, 26, 26, 0.22);
  border-radius: 10px;
  padding: 18px 16px 20px;
}
.coin-area {
  display: flex; justify-content: center; gap: 22px;
  padding: 10px 0 6px;
}
.coin {
  width: 58px; height: 58px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #565656, #161616 70%);
  border: 2px solid #000;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s;
}
.coin-face {
  width: 34px; height: 34px; border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.75);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; color: #f0ede4; letter-spacing: 1px;
}
.coin.shaking { animation: coinShake 0.5s ease; }
@keyframes coinShake {
  0% { transform: rotate(0) translateY(0); }
  25% { transform: rotate(-18deg) translateY(-12px); }
  50% { transform: rotate(14deg) translateY(0); }
  75% { transform: rotate(-10deg) translateY(-8px); }
  100% { transform: rotate(0) translateY(0); }
}

.btn-cast {
  display: block; margin: 18px auto 0;
  padding: 12px 46px; font-size: 18px; letter-spacing: 8px;
  color: #f4f1ea; background: var(--ink);
  border-radius: 6px; cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s, background 0.2s;
}
.btn-cast:active { transform: scale(0.95); background: #000; }
.btn-cast:disabled { opacity: 0.5; cursor: default; }
.cast-tip { text-align: center; font-size: 12px; color: var(--ink-soft); margin-top: 10px; }

/* 爻位图 */
.yao-area { margin-top: 16px; }
.yao-line-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.yao-pos {
  width: 26px; text-align: right; font-size: 11px; color: var(--ink-soft);
  flex-shrink: 0;
}
.yao-line {
  height: 10px; flex: 1; border-radius: 2px;
  background: var(--ink);
  opacity: 0; transition: opacity 0.4s;
}
.yao-line.broken { background: repeating-linear-gradient(90deg, var(--ink) 0 42%, transparent 42% 58%, var(--ink) 58% 100%); }
.yao-line.show { opacity: 1; }
.yao-change {
  width: 30px; font-size: 12px; color: #b00020; flex-shrink: 0; text-align: center;
}

/* 结果区 */
.screen-result { animation: fadeUp 0.5s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.hex-row {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  padding: 8px 0 4px;
}
.hex-name { text-align: center; }
.hex-symbol { display: block; font-size: 44px; color: var(--ink); }
.hex-title { display: block; font-size: 18px; letter-spacing: 4px; margin-top: 4px; }
.hex-vs { font-size: 20px; color: var(--ink-soft); }
.hex-note { text-align: center; font-size: 12px; color: var(--ink-soft); margin-top: 8px; }

.reading-card {
  margin-top: 16px; padding: 16px 16px 18px;
  background: #fff;
  border-left: 4px solid var(--ink);
  border-radius: 0 8px 8px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.reading-title {
  font-size: 14px; letter-spacing: 4px; color: var(--ink);
  margin-bottom: 8px;
}
.reading-text { font-size: 14.5px; line-height: 2.1; color: var(--ink); }

.res-actions { text-align: center; margin-top: 20px; }
.btn-again {
  padding: 11px 40px; font-size: 15px; letter-spacing: 4px;
  color: var(--ink); background: transparent;
  border: 1.5px solid var(--ink); border-radius: 6px;
  cursor: pointer; transition: transform 0.15s, background 0.2s;
}
.btn-again:active { transform: scale(0.95); background: rgba(26, 26, 26, 0.08); }

.footer {
  text-align: center; font-size: 11px; color: var(--ink-soft);
  line-height: 1.8; margin-top: 30px; padding-top: 16px;
  border-top: 1px solid rgba(26, 26, 26, 0.25);
}