/* Nexus ID 登录页样式
   设计要点：左侧品牌叙事、右侧聚焦表单；无外部字体/图片（内网离线可用）；
   支持深色模式、键盘焦点、减少动效偏好。 */

:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #5b6779;
  --line: #e3e8f0;
  --line-strong: #cfd7e5;
  --accent: #4f46e5;
  --accent-strong: #4338ca;
  --accent-soft: #eef2ff;
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --danger-line: #fda29b;
  --shadow-card: 0 1px 2px rgba(16, 24, 40, 0.06), 0 18px 40px -18px rgba(16, 24, 40, 0.28);
  --radius-card: 20px;
  --radius-control: 12px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070b14;
    --card: #0e1729;
    --text: #e8eef9;
    --muted: #94a3b8;
    --line: #1e2a41;
    --line-strong: #2a3a58;
    --accent: #7c83ff;
    --accent-strong: #8b92ff;
    --accent-soft: #171f3a;
    --danger: #ff9b91;
    --danger-soft: #2a1414;
    --danger-line: #6b2a26;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.5), 0 24px 48px -24px rgba(0, 0, 0, 0.8);
  }
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- 布局 ---------- */

.shell {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: minmax(340px, 46%) 1fr;
}

.brand {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: clamp(32px, 5vw, 72px);
  color: #eaf2ff;
  background:
    radial-gradient(1100px 520px at 12% 6%, rgba(56, 189, 248, 0.22), transparent 60%),
    radial-gradient(900px 560px at 88% 92%, rgba(79, 70, 229, 0.4), transparent 62%),
    linear-gradient(160deg, #081020 0%, #0c1729 55%, #0a1220 100%);
}

/* 细网格纹理，暗示"基础设施" */
.brand::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(148, 197, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 197, 255, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(70% 60% at 40% 30%, #000 40%, transparent 100%);
  pointer-events: none;
}

.brand-inner {
  position: relative;
  max-width: 420px;
}

.logo {
  display: inline-flex;
  margin-bottom: 22px;
  filter: drop-shadow(0 8px 24px rgba(56, 189, 248, 0.25));
}

.brand-title {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-sub {
  margin: 6px 0 2px;
  font-size: 16px;
  color: #c7d7f0;
}

.brand-en {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #7f95b8;
}

.points {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.6;
  color: #cfdcf2;
}

.ico {
  width: 18px;
  height: 18px;
  flex: none;
  margin-top: 2px;
  color: #7dd3fc;
}

.brand-org {
  margin: 40px 0 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: #b7c9e4;
}

.brand-foot {
  margin: 0;
  font-size: 12px;
  color: #7f95b8;
}

/* ---------- 右侧表单区 ---------- */

.pane {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
  padding: clamp(24px, 5vw, 56px);
  background:
    radial-gradient(720px 420px at 82% 0%, rgba(79, 70, 229, 0.08), transparent 60%),
    var(--bg);
}

.card {
  width: 100%;
  max-width: 420px;
  padding: clamp(24px, 3vw, 34px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.title {
  margin: 0;
  font-size: 26px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.lead {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* 分段控件 */
.tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
  margin: 24px 0 18px;
  padding: 4px;
  background: var(--accent-soft);
  border-radius: 999px;
}

.tab {
  appearance: none;
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 10px 12px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.tab[aria-selected="true"] {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.1);
}

.tab:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: 2px;
}

/* 错误提示 */
.alert {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 0 0 18px;
  padding: 12px 14px;
  border: 1px solid var(--danger-line);
  border-radius: 12px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 13px;
  line-height: 1.55;
}

.alert[hidden] {
  display: none;
}

.alert-ico {
  width: 18px;
  height: 18px;
  flex: none;
  margin-top: 1px;
}

.alert-title {
  margin: 0;
  font-weight: 700;
}

.alert-body {
  margin: 4px 0 0;
  font-weight: 400;
}

/* Passkey 面板 */
.passkey-visual {
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  margin: 8px auto 22px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 28px;
}

/* 表单 */
.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 600;
}

input[type="email"],
input[type="text"],
input[type="password"] {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  font: inherit;
  font-size: 15px;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input::placeholder {
  color: color-mix(in srgb, var(--muted) 75%, transparent);
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}

input[aria-invalid="true"] {
  border-color: var(--danger);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--danger) 14%, transparent);
}

.code-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.hint {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* 按钮 */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 48px;
  padding: 0 18px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-control);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #5b52f0, var(--accent));
  box-shadow: 0 8px 20px -10px rgba(79, 70, 229, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #5148ea, var(--accent-strong));
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-ghost {
  width: auto;
  height: 46px;
  white-space: nowrap;
  color: var(--accent);
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 22%, transparent);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--accent) 16%, var(--card));
}

.btn:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 40%, transparent);
  outline-offset: 2px;
}

.btn[disabled] {
  cursor: not-allowed;
  opacity: 0.62;
  transform: none;
}

/* 加载态 */
.spinner {
  display: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}

.btn-ghost .spinner {
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
  border-top-color: var(--accent);
}

.btn.is-loading .spinner {
  display: inline-block;
}

.btn.is-loading .btn-label {
  opacity: 0.85;
}

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

/* 元信息 */
.meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  background: color-mix(in srgb, var(--muted) 10%, transparent);
  border-radius: 999px;
}

.link {
  font-size: 12px;
  color: var(--accent);
  text-decoration: none;
}

.link:hover {
  text-decoration: underline;
}

/* 开发测试登录区块 */
.devbox {
  margin-top: 18px;
  padding: 14px;
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, var(--line));
  border-radius: 14px;
}

.devbox-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
}

.devbox-title {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.devbox .field:first-of-type {
  margin-top: 12px;
}

.devbox code {
  padding: 1px 5px;
  font-size: 11.5px;
  background: color-mix(in srgb, var(--muted) 12%, transparent);
  border-radius: 5px;
}

.btn-secondary {
  color: var(--text);
  background: var(--card);
  border-color: var(--line-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.badge-warn {
  color: #b54708;
  background: #fff3e0;
}

@media (prefers-color-scheme: dark) {
  .badge-warn {
    color: #ffc98a;
    background: #2c1f0d;
  }
}

.fineprint {
  display: flex;
  gap: 14px;
  font-size: 12px;
  color: var(--muted);
}

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

.fineprint a:hover {
  color: var(--text);
  text-decoration: underline;
}

/* ---------- 响应式 ---------- */

@media (max-width: 920px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .brand {
    padding: 28px 24px 32px;
  }

  .brand-inner {
    max-width: none;
  }

  .points,
  .brand-org,
  .brand-foot {
    display: none;
  }

  .brand-title {
    font-size: 22px;
  }

  .logo {
    margin-bottom: 14px;
  }

  .logo svg {
    width: 34px;
    height: 34px;
  }

  .pane {
    padding: 22px 16px 32px;
    justify-content: flex-start;
  }

  .card {
    max-width: 520px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- 登录页返回首页 ---------- */

.back-home {
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 30;
  padding: 7px 13px;
  border: 1px solid rgba(100, 116, 139, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: #475569;
  font-size: 13px;
  text-decoration: none;
  backdrop-filter: blur(6px);
}

.back-home:hover {
  color: #0f172a;
  border-color: rgba(79, 70, 229, 0.45);
}

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

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

@media (prefers-color-scheme: dark) {
  .back-home {
    background: rgba(15, 23, 42, 0.86);
    border-color: rgba(148, 163, 184, 0.32);
    color: #cbd5e1;
  }

  .back-home:hover {
    color: #fff;
  }
}
/* 开发测试登录与正式登录的分隔 */
.dev-sep {
  margin: 18px 0 12px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}
/* 手机端：备案信息分多行显示，避免挤成一行看不清 */
@media (max-width: 620px) {
  .fineprint {
    display: block;
    line-height: 2;
    font-size: 11.5px;
    text-align: left;
  }

  .fineprint span,
  .fineprint a {
    display: inline-block;
    margin-right: 8px;
    white-space: nowrap;
  }


}
/* 语言切换 */
/* 登录页语言切换：放在卡片顶部，随文档流，不再浮动遮挡 */
.lang-switch {
  display: flex;
  gap: 6px;
  font-size: 12.5px;
  color: var(--muted);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-top .eyebrow {
  margin: 0;
}

.lang-switch a {
  color: inherit;
  text-decoration: none;
}

.lang-switch a:hover {
  color: var(--accent);
}

.lang-switch a[aria-current="true"] {
  color: var(--accent);
  font-weight: 600;
}
/* 图形验证码 */
.captcha-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.captcha-row input {
  width: 84px;
  text-align: center;
  font-size: 16px;
}

.captcha-row img {
  border-radius: 8px;
  border: 1px solid var(--line);
  cursor: pointer;
}

/* 密码显示/隐藏 */
.input-with-eye {
  position: relative;
}

.input-with-eye input {
  padding-right: 44px;
}

.eye-btn {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.eye-btn:hover {
  background: rgba(100, 116, 139, 0.12);
  color: var(--text);
}
/* ---------- 登录页：页脚固定在视口底部，不随卡片缩放移动 ---------- */

body > .fineprint {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 16px;
  margin: 0;
  padding: 9px 16px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--line);
}

body > .fineprint a {
  color: inherit;
  text-decoration: none;
}

body > .fineprint a:hover {
  color: var(--text);
  text-decoration: underline;
}

/* 给固定页脚留出空间，避免遮挡卡片底部 */
.shell {
  padding-bottom: 56px;
}

@media (max-width: 640px) {
  body > .fineprint {
    gap: 2px 12px;
    padding: 7px 12px;
    font-size: 11px;
  }

  .shell {
    padding-bottom: 86px;
  }
}
/* 记住我 */
.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 10px 0 14px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}

.check-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}