/*
 * TSS 登录页样式。
 *
 * 取值来自仓库根 DESIGN.md 的 token（暖纸 + 陶土）；页面自包含，不引用任何
 * 外站字体、图片或 CDN。CSP 为 style-src 'self'，因此没有内联 style 属性。
 */

:root {
  color-scheme: light dark;

  --tss-primary: #d97757;
  --tss-primary-hover: #b85d3d;
  --tss-primary-text: #b85d3d;
  --tss-surface: #ffffff;
  --tss-surface-sunken: #f6efe6;
  --tss-text: #1a1918;
  --tss-text-dim: #8b867e;
  --tss-border: #e5e1d8;
  --tss-border-strong: #d6d0c4;
  --tss-fail-text: #b0362e;
  --tss-disabled-bg: #edeae3;
  --tss-disabled-text: #b0aba1;

  --tss-radius-sm: 8px;
  --tss-radius-lg: 12px;
  --tss-focus-ring: 0 0 0 3px rgba(217, 119, 87, 0.2);

  --tss-font-heading: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
  --tss-font-body:
    'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
}

/* 暗色 = 暖墨：主色不变，只调悬停/文字与底色（DESIGN.md 色彩表）。 */
@media (prefers-color-scheme: dark) {
  :root {
    --tss-primary-hover: #e08b6e;
    --tss-primary-text: #e8a18a;
    --tss-surface: #26241f;
    --tss-surface-sunken: #1a1918;
    --tss-text: #f5f4f0;
    --tss-border: #3d3a35;
    --tss-border-strong: #4a463f;
    /* fail 70% + 正文色 30% 的派生值，保证暗底上的小字号对比度 */
    --tss-fail-text: #df7a73;
    --tss-disabled-bg: #3d3a35;
    --tss-disabled-text: #8b867e;
  }
}

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--tss-surface-sunken);
  color: var(--tss-text);
  font-family: var(--tss-font-body);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.login-shell {
  width: 100%;
  max-width: 360px;
}

.login-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px;
  background: var(--tss-surface);
  border: 1px solid var(--tss-border);
  border-radius: var(--tss-radius-lg);
}

.login-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}

.login-title {
  margin: 0;
  font-family: var(--tss-font-heading);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.login-subtitle {
  margin: 0;
  color: var(--tss-text-dim);
  font-size: 12px;
  line-height: 1.4;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
}

.field input {
  width: 100%;
  min-height: 36px;
  padding: 7px 10px;
  background: var(--tss-surface);
  color: var(--tss-text);
  border: 1px solid var(--tss-border);
  border-radius: var(--tss-radius-sm);
  font: inherit;
  transition:
    border-color 120ms ease,
    box-shadow 120ms ease;
}

.field input:hover:not(:disabled) {
  border-color: var(--tss-border-strong);
}

.field input:focus {
  outline: none;
  border-color: var(--tss-primary);
  box-shadow: var(--tss-focus-ring);
}

.field input[aria-invalid='true'] {
  border-color: var(--tss-fail-text);
}

.field input:disabled {
  background: var(--tss-disabled-bg);
  color: var(--tss-disabled-text);
  border-color: var(--tss-border);
  cursor: not-allowed;
}

.remember {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 8px;
  font-size: 13px;
  line-height: 1.4;
  cursor: pointer;
  user-select: none;
}

.remember input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--tss-primary);
}

.remember input:focus-visible {
  outline: 2px solid var(--tss-primary);
  outline-offset: 2px;
}

.error {
  margin: 0;
  min-height: 1.5em;
  color: var(--tss-fail-text);
  font-size: 13px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.submit {
  min-height: 40px;
  padding: 8px 14px;
  background: var(--tss-primary);
  color: #ffffff;
  border: 1px solid transparent;
  border-radius: var(--tss-radius-sm);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 120ms ease;
}

.submit:hover:not(:disabled) {
  background: var(--tss-primary-hover);
}

.submit:focus-visible {
  outline: 2px solid var(--tss-primary-text);
  outline-offset: 2px;
  box-shadow: var(--tss-focus-ring);
}

.submit:disabled {
  background: var(--tss-disabled-bg);
  color: var(--tss-disabled-text);
  cursor: not-allowed;
}

.notice {
  margin: 0;
  padding: 8px 10px;
  background: var(--tss-surface-sunken);
  color: var(--tss-text-dim);
  border: 1px solid var(--tss-border);
  border-radius: var(--tss-radius-sm);
  font-size: 12px;
}

@media (max-width: 420px) {
  body {
    padding: 16px;
  }

  .login-card {
    padding: 24px;
  }
}

/* 高对比度模式会丢弃 box-shadow，用系统色补回焦点可见性 */
@media (forced-colors: active) {
  .field input:focus,
  .remember input:focus-visible,
  .submit:focus-visible {
    outline: 2px solid CanvasText;
    outline-offset: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .field input,
  .submit {
    transition: none;
  }
}