/* ==========================================================================
   人机验证页 · 纯白浅色主题（verify.etherealpeak.cn）
   设计令牌与组件样式见 docs/UI.md
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-tint: #f2f6fd;
  --surface: #ffffff;
  --surface-soft: #f7f9fc;
  --border: #e6eaf2;
  --border-strong: #d5dce8;
  --text: #111827;
  --text-soft: #4b5563;
  --muted: #8b95a5;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff4ff;
  --accent-ring: rgba(37, 99, 235, 0.18);
  --ok: #15803d;
  --ok-soft: #f0fdf5;
  --ok-border: #bbf7d0;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --shadow-card: 0 1px 2px rgba(17, 24, 39, 0.04), 0 18px 40px -22px rgba(17, 24, 39, 0.22);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 纯白主背景 + 顶部极淡冷色光晕，避免大面积死白 */
.page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  min-height: 100vh;
  padding: 32px 16px;
  background: radial-gradient(900px 420px at 50% -8%, var(--bg-tint) 0%, var(--bg) 62%);
}

.page__note {
  margin: 0;
  max-width: 460px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.card {
  width: 100%;
  max-width: 460px;
  padding: 26px 26px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* --- 品牌条 ------------------------------------------------------------- */

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 18px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
}

.brand__mark svg {
  width: 17px;
  height: 17px;
}

.brand__name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.brand__tag {
  margin-left: auto;
  padding: 3px 9px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 12px;
}

/* --- 标题 --------------------------------------------------------------- */

.intro {
  margin-bottom: 18px;
}

.intro__title {
  margin: 0 0 4px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.intro__text {
  margin: 0;
  color: var(--text-soft);
  font-size: 13px;
}

/* --- 面板 / 通用 -------------------------------------------------------- */

.panel + .panel {
  margin-top: 16px;
}

.panel__hint {
  margin: 0 0 14px;
  color: var(--text-soft);
  font-size: 13px;
}

.field__label {
  display: block;
  margin-bottom: 6px;
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 500;
}

.field + .field {
  margin-top: 12px;
}

/* --- 验证码 ------------------------------------------------------------- */

.captcha {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 96px;
  margin-bottom: 8px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.captcha svg {
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.captcha__hint {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 12px;
}

/* --- 输入框 ------------------------------------------------------------- */

input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 16px;
  letter-spacing: 0.14em;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]::placeholder {
  color: var(--muted);
  letter-spacing: normal;
}

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}

/* --- 按钮 --------------------------------------------------------------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  flex: 1 1 auto;
  min-width: 140px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

/* 跨域名跳转用的链接按钮需要显式盒模型，否则内联元素撑不出按钮尺寸 */
a.btn {
  display: inline-block;
  box-sizing: border-box;
  text-align: center;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37, 99, 235, 0.25);
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn--ghost {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}

.btn--ghost:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* --- 提示条 / 加载 ------------------------------------------------------ */

.notice {
  margin-bottom: 14px;
  padding: 11px 13px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 13px;
  word-break: break-word;
}

.notice--error {
  background: var(--danger-soft);
  border-color: var(--danger-border);
  color: var(--danger);
}

.notice--ok {
  background: var(--ok-soft);
  border-color: var(--ok-border);
  color: var(--ok);
}

.loading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
}

.spinner {
  width: 15px;
  height: 15px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.hidden {
  display: none !important;
}

@media (max-width: 420px) {
  .card {
    padding: 22px 18px 16px;
    border-radius: var(--radius-md);
  }

  .btn {
    min-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 2s;
  }
}