/* TGC App stylesheet. One file, design tokens as custom properties (see docs/DESIGN.md).
   No third-party fonts or scripts; served same-origin under a strict CSP. */

:root {
  /* Brand */
  --color-cobalt: #2a55e0;
  --color-cobalt-dark: #1d3fae;
  --color-cobalt-50: #eef2fd;
  --color-cobalt-100: #dce5fb;
  --color-ink: #070b16;

  /* Neutrals (text contrast on white noted) */
  --color-text: #070b16;
  --color-text-muted: #4a5263; /* 7.8:1 */
  --color-border-strong: #6b7385; /* 4.8:1, form control boundaries */
  --color-border: #d5dae4; /* decorative only */
  --color-surface: #ffffff;
  --color-canvas: #f5f7fb;
  --color-footer-text: #c9cfdb; /* 12.6:1 on ink */

  /* Status (text colours meet 4.5:1 on their tint) */
  --color-success: #0f6b4f;
  --color-success-bg: #e6f4ee;
  --color-warning: #7a4f00;
  --color-warning-bg: #fdf3dc;
  --color-danger: #a8231a;
  --color-danger-bg: #fdecea;
  --color-neutral-bg: #eceff4;

  /* Type: system stacks with CJK fallbacks, major-third scale */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5625rem;
  --text-2xl: clamp(1.75rem, 1.35rem + 1.8vw, 2.4rem);
  --leading-body: 1.6;
  --leading-tight: 1.25;

  /* Space: 4 px base */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Shape */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-pill: 999px;
  --border-width: 1px;
  --focus-ring: 3px solid var(--color-cobalt);
  --focus-offset: 2px;
  --control-height: 2.75rem; /* 44 px touch target */
  --container: 72rem;
  --container-narrow: 34rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  overflow-wrap: break-word;
}

:lang(zh-Hans) body,
html:lang(zh-Hans) {
  line-height: 1.75;
}

h1,
h2,
h3 {
  line-height: var(--leading-tight);
  margin: 0 0 var(--space-4);
  font-weight: 700;
}

h1 {
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-lg);
}

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-cobalt);
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--color-cobalt-dark);
}

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

main:focus {
  outline: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -10rem;
  z-index: 10;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-cobalt);
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-2);
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.main {
  flex: 1;
  padding-top: var(--space-8);
  padding-bottom: var(--space-12);
}

.grid {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

@media (min-width: 48rem) {
  .container {
    padding: 0 var(--space-6);
  }

  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: var(--border-width) solid var(--color-border);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-6);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--control-height);
  color: var(--color-ink);
  font-weight: 800;
  font-size: var(--text-lg);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--color-ink);
}

.brand__mark {
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 3px;
  background: var(--color-cobalt);
  box-shadow: 0.3rem 0.3rem 0 var(--color-ink);
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__list a {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-height);
  color: var(--color-ink);
  font-weight: 600;
  text-decoration: none;
}

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

.site-header__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  margin-left: auto;
}

.account {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
}

.account form,
.lang-switch {
  margin: 0;
}

@media (max-width: 47.99rem) {
  /* Narrow screens: name and role on one line, sign-out and language buttons side by side below. */
  .site-header__tools {
    width: 100%;
    margin-left: 0;
  }

  .account {
    display: contents;
  }

  .account__who {
    flex-basis: 100%;
  }

  .lang-switch {
    margin-left: auto;
  }
}

.account__who {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.account__role {
  display: inline-block;
  margin-left: var(--space-2);
  padding: 0 var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-cobalt-50);
  color: var(--color-cobalt-dark);
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: var(--color-ink);
  color: var(--color-footer-text);
  font-size: var(--text-sm);
}

.site-footer__inner {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.site-footer p:last-child {
  margin-bottom: 0;
}

/* Text */
.lead {
  max-width: 44rem;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.eyebrow {
  margin-bottom: var(--space-2);
  color: var(--color-cobalt);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero {
  padding: var(--space-6) 0 var(--space-8);
}

.hero h1 {
  max-width: 40rem;
}

.aside {
  margin-top: var(--space-6);
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding-left: var(--space-6);
  margin-bottom: var(--space-3);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 2px;
  background: var(--color-cobalt);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-height);
  padding: var(--space-2) var(--space-5);
  border: 2px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.button--primary {
  background: var(--color-cobalt);
  color: #ffffff;
}

.button--primary:hover {
  background: var(--color-cobalt-dark);
  color: #ffffff;
}

.button--secondary {
  background: var(--color-surface);
  border-color: var(--color-cobalt);
  color: var(--color-cobalt);
}

.button--secondary:hover {
  background: var(--color-cobalt-50);
  color: var(--color-cobalt-dark);
}

.button--quiet {
  padding-left: var(--space-3);
  padding-right: var(--space-3);
  background: transparent;
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.button--quiet:hover {
  background: var(--color-cobalt-50);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Cards */
.card {
  margin-bottom: var(--space-6);
  padding: var(--space-6);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius);
}

.grid > .card {
  margin-bottom: 0;
}

.card > :last-child {
  margin-bottom: 0;
}

.card__title {
  font-size: var(--text-lg);
}

.card--accent {
  background: var(--color-cobalt-50);
  border-color: var(--color-cobalt-100);
}

/* Forms */
.form {
  display: grid;
  gap: var(--space-5);
}

.field {
  display: grid;
  gap: var(--space-1);
}

.field__label {
  font-weight: 600;
}

.field__optional {
  color: var(--color-text-muted);
  font-weight: 400;
}

.field__hint {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.field__error {
  margin: 0;
  color: var(--color-danger);
  font-size: var(--text-sm);
  font-weight: 600;
}

.field__error::before {
  content: "! ";
}

.field__input {
  width: 100%;
  min-height: var(--control-height);
  padding: var(--space-2) var(--space-3);
  border: var(--border-width) solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
}

.field__input:focus-visible {
  border-color: var(--color-cobalt);
}

.field--error .field__input {
  border: 2px solid var(--color-danger);
}

.field__select {
  appearance: auto;
}

/* Alerts */
.alert {
  margin-bottom: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border-left: 4px solid var(--color-cobalt);
  border-radius: var(--radius-sm);
  background: var(--color-cobalt-50);
}

.alert__title {
  margin: 0;
  font-weight: 700;
}

.alert__body,
.alert__list {
  margin: var(--space-2) 0 0;
}

.alert__list {
  padding-left: var(--space-5);
}

.alert--success {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}

.alert--warning {
  border-color: var(--color-warning);
  background: var(--color-warning-bg);
}

.alert--error {
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
}

.alert--error a {
  color: var(--color-danger);
}

/* Status badges: text always carries the meaning; shape and colour reinforce it */
.badge {
  display: inline-block;
  padding: 0.1rem var(--space-3);
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.badge--queued {
  background: var(--color-neutral-bg);
  color: var(--color-text-muted);
}

.badge--running {
  background: var(--color-cobalt-50);
  border-color: var(--color-cobalt-100);
  color: var(--color-cobalt-dark);
}

.badge--done {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge--failed {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge--not-tested {
  background: var(--color-surface);
  border: var(--border-width) dashed var(--color-border-strong);
  color: var(--color-text-muted);
}

/* Empty states */
.empty {
  padding: var(--space-8) var(--space-4);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  text-align: center;
}

.empty__title {
  margin-bottom: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 700;
}

.empty__body {
  max-width: 32rem;
  margin: 0 auto;
  color: var(--color-text-muted);
}

/* Tables: reflow to labelled rows on narrow screens */
.table-wrap {
  width: 100%;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table__caption {
  margin-bottom: var(--space-3);
  font-weight: 700;
  text-align: left;
}

.table th,
.table td {
  padding: var(--space-3);
  border-bottom: var(--border-width) solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.table th {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.table__num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 40rem) {
  .table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .table tr {
    display: block;
    padding: var(--space-3) 0;
    border-bottom: var(--border-width) solid var(--color-border);
  }

  .table td {
    display: grid;
    grid-template-columns: minmax(6rem, 40%) 1fr;
    justify-items: start;
    gap: var(--space-3);
    padding: var(--space-1) 0;
    border: 0;
    text-align: left;
  }

  .table td::before {
    content: attr(data-label);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 600;
  }
}

/* Message pages (404, 403, 500) */
.message {
  padding: var(--space-8) 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}

@media (forced-colors: active) {
  .button,
  .badge,
  .card {
    border: 1px solid CanvasText;
  }
}