/* 泉学 · 研习入口 —— 水墨深色、克制留白、缓与静。复用 styles.css 的设计令牌（--ink-faint 等）。 */

.login-body {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 32px 16px;
  position: relative; overflow: hidden;
}

/* 背景纹样：极淡、居中、缓慢呼吸；绝不抢主体 */
.glyph-bg {
  position: fixed; inset: 0; margin: auto;
  width: min(74vmin, 560px); height: min(74vmin, 560px);
  pointer-events: none; z-index: 0;
  opacity: 0.10;
  animation: glyph-breathe 14s ease-in-out infinite;
}
.glyph-lines line {
  stroke: var(--ink-soft); stroke-width: 2.2; stroke-linecap: round;
}
.glyph-taiji circle, .glyph-taiji path {
  fill: none; stroke: var(--accent); stroke-width: 1.4;
}
@keyframes glyph-breathe {
  0%, 100% { opacity: 0.08; transform: scale(1); }
  50%      { opacity: 0.14; transform: scale(1.015); }
}
@media (prefers-reduced-motion: reduce) {
  .glyph-bg { animation: none; }
}

.login-wrap { position: relative; z-index: 1; width: 100%; max-width: 380px; }

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px clamp(22px, 6vw, 38px) 30px;
  text-align: center;
}

.login-kicker {
  margin: 0 0 14px; color: var(--ink-faint);
  font-size: 0.78rem; letter-spacing: 0.42em; text-indent: 0.42em;
  text-transform: none;
}
.login-title {
  margin: 0; font-size: clamp(2.4rem, 9vw, 3.2rem); font-weight: 600;
  letter-spacing: 0.18em; text-indent: 0.18em; color: var(--ink);
}
.login-sub {
  margin: 6px 0 30px; color: var(--ink-soft);
  font-size: 0.92rem; letter-spacing: 0.32em; text-indent: 0.32em;
}

.login-form { text-align: left; }
.login-form .field { margin-bottom: 16px; }
.login-form .field-label { letter-spacing: 0.12em; }

.login-submit {
  width: 100%; margin-top: 6px;
  letter-spacing: 0.5em; text-indent: 0.5em; font-size: 1rem; padding: 11px 0;
}

.login-msg {
  margin: 14px 0 0; min-height: 1.2em; text-align: center;
  font-size: 0.84rem; color: var(--demo);
}

.login-epigraph {
  margin: 28px 0 0; padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint); font-size: 0.8rem; line-height: 1.9;
  letter-spacing: 0.06em; text-align: center; font-style: normal;
}