/* 承天之弈 · 登录页 —— Material Design 3
   令牌来自 md3-tokens.css，按钮 / 文本框 / 分段按钮 / 纸片来自 oauth-pages.css，这里只管登录页自己的布局。 */

.lg-body {
  position: relative;
  min-height: 100dvh;
  overflow-x: hidden;
  background: var(--md-sys-color-surface);
}

/* 背景：两团柔和的色晕（主色容器 + 第三色容器），静止，不抢表单的注意力 */
.lg-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(60vmax 50vmax at 12% 8%, color-mix(in srgb, var(--md-sys-color-primary-container) 70%, transparent), transparent 70%),
    radial-gradient(50vmax 44vmax at 92% 96%, color-mix(in srgb, var(--md-sys-color-tertiary-container) 60%, transparent), transparent 70%);
  pointer-events: none;
}

.lg-skip {
  position: fixed;
  left: 16px;
  top: -64px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: var(--md-sys-shape-corner-full);
  background: var(--md-sys-color-inverse-surface);
  color: var(--md-sys-color-inverse-on-surface);
  text-decoration: none;
  transition: top 0.15s;
}
.lg-skip:focus { top: 12px; }

.lg-page {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: center;
  gap: clamp(32px, 6vw, 96px);
  width: min(1120px, 100%);
  min-height: 100dvh;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 64px) clamp(16px, 4vw, 48px);
  padding-bottom: max(clamp(24px, 5vw, 64px), env(safe-area-inset-bottom));
}

.lg-theme {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  z-index: 5;
}

/* ---- 左：品牌与简介 ---- */
.lg-hero { display: grid; gap: 16px; align-content: center; justify-items: start; }
.lg-seal {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  border-radius: var(--md-sys-shape-corner-extra-large);
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  font: 600 38px/1 "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  box-shadow: var(--md-sys-elevation-level2);
}
.lg-title { font: var(--md-sys-typescale-display-medium); letter-spacing: 0.04em; color: var(--md-sys-color-on-surface); }
.lg-tagline { font: var(--md-sys-typescale-title-large); color: var(--md-sys-color-on-surface-variant); letter-spacing: 0.12em; }
.lg-points { display: grid; gap: 14px; margin: 12px 0 4px; padding: 0; list-style: none; }
.lg-points li { display: flex; align-items: flex-start; gap: 14px; }
.lg-points .md-icon {
  box-sizing: content-box;
  width: 22px;
  height: 22px;
  padding: 9px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}
.lg-points strong { display: block; font: var(--md-sys-typescale-title-medium); }
.lg-points small { color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-body-medium); }
.lg-guest { margin-left: -12px; }

/* ---- 右：表单卡片 ---- */
.lg-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--md-sys-shape-corner-extra-large);
  background: var(--md-sys-color-surface-container-low);
  box-shadow: var(--md-sys-elevation-level2);
}
.lg-card__body { display: grid; gap: 12px; padding: clamp(24px, 4vw, 36px); }
.lg-card__head h2 { font: var(--md-sys-typescale-headline-medium); }
.lg-card__head p { margin-top: 4px; color: var(--md-sys-color-on-surface-variant); }

/* 提交 / 检查登录状态时卡片顶上的不定进度条 */
.lg-progress { position: absolute; inset: 0 0 auto 0; z-index: 2; height: 4px; overflow: hidden; background: color-mix(in srgb, var(--md-sys-color-primary) 18%, transparent); }
.lg-progress > span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 40%;
  border-radius: var(--md-sys-shape-corner-full);
  background: var(--md-sys-color-primary);
  animation: lg-slide 1.3s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}
@keyframes lg-slide { from { transform: translateX(-100%); } to { transform: translateX(260%); } }

.lg-checking { display: grid; justify-items: center; gap: 12px; padding: 64px 24px; color: var(--md-sys-color-on-surface-variant); }
.lg-checking .md-icon { width: 32px; height: 32px; color: var(--md-sys-color-primary); }

.lg-mode { justify-self: stretch; display: grid; grid-template-columns: 1fr 1fr; }
.lg-mode > button { justify-content: center; }

.lg-destination { justify-self: start; max-width: 100%; white-space: normal; }

/* ---- 文本框：带前置图标、尾部操作 ---- */
.lg-field > label { color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-body-small); }
.lg-input { position: relative; }
.lg-input input { padding-left: 48px; padding-right: 16px; }
.lg-field[data-field="password"] .lg-input input { padding-right: 52px; }
.lg-input__icon { position: absolute; left: 14px; top: 50%; width: 24px; height: 24px; transform: translateY(-50%); color: var(--md-sys-color-on-surface-variant); pointer-events: none; }
.lg-input__icon .md-icon { width: 20px; height: 20px; }
.lg-input__action { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); }
.lg-input input:focus ~ .lg-input__icon,
.lg-input:focus-within .lg-input__icon { color: var(--md-sys-color-primary); }

.lg-field.is-invalid input { border-bottom: 2px solid var(--md-sys-color-error); padding-bottom: 13px; }
.lg-field.is-invalid > label,
.lg-field.is-invalid .lg-hint { color: var(--md-sys-color-error); }
.lg-field.is-valid .lg-hint { color: var(--md-chart-3); }
.lg-hint { min-height: 16px; padding-left: 16px; color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-body-small); }

/* 密码强度：四格，按强度点亮 */
.lg-strength { display: flex; align-items: center; gap: 12px; padding: 4px 16px 0; }
.lg-strength__bar { display: grid; flex: 1; grid-template-columns: repeat(4, 1fr); gap: 4px; }
.lg-strength__bar > span { height: 4px; border-radius: var(--md-sys-shape-corner-full); background: var(--md-sys-color-outline-variant); transition: background-color 0.2s; }
.lg-strength[data-level="1"] .lg-strength__bar > span:nth-child(-n+1) { background: var(--md-sys-color-error); }
.lg-strength[data-level="2"] .lg-strength__bar > span:nth-child(-n+2) { background: var(--md-sys-color-tertiary); }
.lg-strength[data-level="3"] .lg-strength__bar > span:nth-child(-n+3) { background: var(--md-sys-color-primary); }
.lg-strength[data-level="4"] .lg-strength__bar > span:nth-child(-n+4) { background: var(--md-chart-3); }
.lg-strength small { min-width: 3em; color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-label-medium); text-align: right; }

.lg-caps { display: flex; align-items: center; gap: 6px; padding: 4px 16px 0; color: var(--md-sys-color-tertiary); font: var(--md-sys-typescale-label-medium); }
.lg-caps .md-icon { width: 16px; height: 16px; }

.lg-remember small { display: block; color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-body-small); }

.lg-error { padding: 12px 16px; border-radius: var(--md-sys-shape-corner-medium); background: var(--md-sys-color-error-container); color: var(--md-sys-color-on-error-container); font: var(--md-sys-typescale-body-medium); }

.lg-submit { width: 100%; margin-top: 6px; }
.lg-guest-mobile { display: none; justify-self: center; color: var(--md-sys-color-primary); font: var(--md-sys-typescale-label-large); text-decoration: none; }
.lg-submit .md-icon { width: 20px; height: 20px; margin-left: 0; }
.lg-foot { color: var(--md-sys-color-on-surface-variant); font: var(--md-sys-typescale-body-small); text-align: center; }

/* ---- 窄屏：单列。品牌压成一行放在表单上面，简介和公开赛事入口收到卡片底部 ---- */
@media (max-width: 860px) {
  .lg-page { grid-template-columns: minmax(0, 1fr); align-content: start; gap: 20px; padding-top: 64px; }
  .lg-hero { order: 1; grid-template-columns: auto minmax(0, 1fr); column-gap: 14px; row-gap: 0; align-items: center; justify-items: start; }
  .lg-card { order: 2; }
  .lg-points, .lg-guest { display: none; }
  .lg-guest-mobile { display: inline-flex; }
  .lg-seal { grid-row: 1 / span 2; width: 52px; height: 52px; font-size: 28px; border-radius: var(--md-sys-shape-corner-large); }
  .lg-title { font: var(--md-sys-typescale-headline-medium); }
  .lg-tagline { font: var(--md-sys-typescale-body-medium); letter-spacing: 0.1em; }
}
@media (max-width: 420px) {
  .lg-card__body { padding: 20px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .lg-progress > span { animation-duration: 3s; }
  .lg-skip { transition: none; }
}