/* ============================================================================
 * dingyue — design tokens
 * ========================================================================== */
:root {
  /* Brand */
  --primary:        #4f46e5;   /* indigo-600 */
  --primary-dark:   #4338ca;   /* indigo-700 */
  --primary-soft:   #eef2ff;   /* indigo-50  */
  --primary-ring:   rgba(79, 70, 229, 0.35);
  --accent:         #10b981;   /* emerald-500 */
  --accent-soft:    #ecfdf5;

  /* Surfaces */
  --bg:             #f6f7fb;
  --bg-grad-from:   #f5f7ff;
  --bg-grad-to:     #eef1fb;
  --surface:        #ffffff;
  --surface-2:      #fafbff;
  --border:         #e5e7ef;
  --border-strong:  #d4d8e6;

  /* Text */
  --fg:             #1f2433;
  --fg-soft:        #4b5168;
  --muted:          #8089a3;

  /* Status */
  --success-bg:     #ecfdf5;
  --success-fg:     #047857;
  --warn-bg:        #fff7ed;
  --warn-fg:        #c2410c;
  --danger-bg:      #fef2f2;
  --danger-fg:      #b91c1c;
  --info-bg:        #eef2ff;
  --info-fg:        #3730a3;

  /* Effects */
  --shadow-sm:      0 1px 2px rgba(15, 23, 42, .06);
  --shadow:         0 4px 14px rgba(15, 23, 42, .08);
  --shadow-md:      0 8px 24px rgba(15, 23, 42, .10);
  --shadow-lg:      0 20px 40px rgba(15, 23, 42, .12);
  --radius-sm:      6px;
  --radius:         10px;
  --radius-lg:      14px;
  --radius-xl:      20px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Helvetica Neue",
               Arial, sans-serif;
  font-feature-settings: "tnum" 1;
  background:
    radial-gradient(1100px 540px at 50% -10%, var(--bg-grad-from), transparent 70%),
    var(--bg);
  color: var(--fg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; }

/* ============================================================================
 * Topbar
 * ========================================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.brand {
  font-weight: 700;
  font-size: 1.15em;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.brand::before {
  content: "";
  width: 22px; height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  box-shadow: 0 4px 10px var(--primary-ring);
}
.topbar nav { display: flex; gap: 18px; align-items: center; }
.topbar nav a {
  text-decoration: none;
  color: var(--fg-soft);
  font-weight: 500;
  font-size: 0.95em;
  padding: 6px 4px;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.topbar nav a:hover { color: var(--primary); }
.topbar nav a.active { color: var(--primary); border-bottom-color: var(--primary); }
.topbar nav button.linklike {
  background: none; border: none; cursor: pointer;
  color: var(--fg-soft); font: inherit; font-weight: 500;
  padding: 6px 4px; border-bottom: 2px solid transparent;
}
.topbar nav button.linklike:hover { color: var(--primary); }
.linklike { background: none; border: none; cursor: pointer; padding: 0; color: var(--primary); text-decoration: underline; font: inherit; }
.inline { display: inline; margin: 0; }

/* ============================================================================
 * Layout
 * ========================================================================== */
main { max-width: 1100px; margin: 0 auto; padding: 36px 28px 56px; }
footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 22px 28px 32px;
  color: var(--muted);
  font-size: 0.88em;
  border-top: 1px solid var(--border);
  background: linear-gradient(0deg, rgba(238, 241, 251, .6), transparent);
}
footer .beian { margin-top: 6px; font-size: 0.92em; color: var(--fg-soft); }
footer .beian .beian-ps { display: inline-flex; align-items: center; gap: 6px; }
footer .beian .beian-icon { width: 16px; height: 16px; vertical-align: middle; }
footer .beian a { color: inherit; text-decoration: none; transition: color .15s ease; }
footer .beian a:hover { color: var(--primary); text-decoration: underline; }

/* ============================================================================
 * Typography
 * ========================================================================== */
h1 { margin: 0 0 .5em; font-size: 2rem; letter-spacing: -0.02em; line-height: 1.2; }
h2 { margin-top: 0; font-size: 1.25rem; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 0 0 .4em; }
p  { margin: 0 0 .8em; color: var(--fg-soft); }
a  { color: var(--primary); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

.muted { color: var(--muted); }
.small { font-size: 0.9em; }

/* ============================================================================
 * Hero  (homepage / pricing)
 * ========================================================================== */
.hero {
  text-align: center;
  padding: 56px 24px 28px;
  margin: -36px -28px 28px;
  background:
    radial-gradient(800px 400px at 50% 0%, rgba(79, 70, 229, 0.10), transparent 70%),
    linear-gradient(180deg, #ffffff, transparent);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--fg) 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.03em;
}
.hero .lead { font-size: 1.12em; color: var(--fg-soft); margin: 0 auto 24px; max-width: 620px; }
.hero .cta { display: inline-flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ============================================================================
 * Features grid (homepage)
 * ========================================================================== */
.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 28px;
}
@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .features { grid-template-columns: 1fr; }
}
.features article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 22px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.features article:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
}
.features article h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.features article h3::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}
.features article p { margin: 0; font-size: 0.95em; }

/* ============================================================================
 * Pricing grid
 * ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 22px;
}
@media (max-width: 900px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .pricing-grid { grid-template-columns: 1fr; }
}
.tier {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  position: relative;
  overflow: hidden;
}
.tier::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), #6366f1);
  opacity: .85;
}
.tier:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.tier h2 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--fg);
}
.tier .quota {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin: 4px 0 2px;
}
.tier .quota-suffix {
  font-size: 0.85em;
  font-weight: 500;
  color: var(--muted);
  margin-left: 4px;
}
.tier .desc {
  font-size: 0.92em;
  color: var(--fg-soft);
  margin: 4px 0 14px;
  flex: 1;
}
.tier form { margin-top: auto; }
.tier button { width: 100%; }

/* "Recommended" tier — middle tier gets highlighted */
.tier.recommended {
  border-color: var(--primary);
  box-shadow: 0 8px 24px var(--primary-ring);
  transform: translateY(-2px);
}
.tier.recommended::after {
  content: "推荐";
  position: absolute;
  top: 14px; right: 14px;
  background: var(--primary);
  color: #fff;
  font-size: 0.72em;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: .04em;
}

/* ============================================================================
 * Cards & panels
 * ========================================================================== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.card h2 { margin: 0 0 14px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }

/* ============================================================================
 * Buttons
 * ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--fg);
  text-decoration: none;
  cursor: pointer;
  font: inherit;
  font-weight: 500;
  font-size: 0.95em;
  transition: background .15s ease, color .15s ease, border-color .15s ease,
              box-shadow .15s ease, transform .1s ease;
}
.btn:hover { border-color: var(--border-strong); background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px var(--primary-ring);
}
.btn.primary {
  background: linear-gradient(180deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-color: var(--primary-dark);
  box-shadow: 0 4px 12px var(--primary-ring);
}
.btn.primary:hover {
  background: linear-gradient(180deg, var(--primary-dark), #3730a3);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 6px 16px var(--primary-ring);
}
.btn.ghost { background: transparent; border-color: var(--border); }
.btn.ghost:hover { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.btn.lg { padding: 13px 28px; font-size: 1rem; border-radius: 10px; }
.btn.small { padding: 5px 12px; font-size: 0.85em; border-radius: 6px; }
.btn.danger { background: var(--danger-bg); color: var(--danger-fg); border-color: #fecaca; }
.btn.danger:hover { background: #fee2e2; }

/* ============================================================================
 * Forms
 * ========================================================================== */
.form { display: grid; gap: 14px; max-width: 380px; }
.form label { display: grid; gap: 6px; font-weight: 500; color: var(--fg); }
.form input, .form textarea, .form select {
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-ring);
}

/* ============================================================================
 * Flash messages
 * ========================================================================== */
.flash {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  background: var(--info-bg);
  color: var(--info-fg);
  border: 1px solid #c7d2fe;
}
.flash.error   { background: var(--danger-bg); color: var(--danger-fg); border-color: #fecaca; }
.flash.success { background: var(--success-bg); color: var(--success-fg); border-color: #a7f3d0; overflow-wrap: anywhere; }
.flash.warn    { background: var(--warn-bg); color: var(--warn-fg); border-color: #fed7aa; }

/* ============================================================================
 * Code blocks
 * ========================================================================== */
code {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono",
               Menlo, Consolas, monospace;
  background: #eef0f6;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
  color: var(--fg);
}
pre.codeblock {
  background: #0f172a;
  color: #e2e8f0;
  padding: 14px 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.85em;
  line-height: 1.6;
  margin: 8px 0 14px;
  border: 1px solid #1e293b;
  box-shadow: var(--shadow-sm);
}
pre.codeblock code {
  background: transparent;
  color: inherit;
  padding: 0;
  white-space: pre;
}

/* ---- Tab switcher for code samples -------------------------------------- */
.code-tabs { margin-top: 8px; }
.tab-headers { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin-bottom: 0; }
.tab-head {
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  padding: 8px 14px;
  font-size: 0.88em;
  color: var(--muted);
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  font-weight: 500;
  transition: color .15s ease, background .15s ease;
}
.tab-head:hover { color: var(--fg); background: var(--surface-2); }
.tab-head.active {
  background: var(--surface);
  color: var(--primary);
  border-color: var(--border);
  border-bottom-color: var(--surface);
  margin-bottom: -1px;
}
.tab-body { display: none; }
.tab-body.active { display: block; }
.tab-body pre.codeblock { margin-top: 0; border-top-left-radius: 0; }

/* ============================================================================
 * Tables
 * ========================================================================== */
table.data {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
table.data th, table.data td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.92em;
  vertical-align: middle;
}
table.data thead th {
  background: var(--surface-2);
  font-weight: 600;
  color: var(--fg-soft);
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: .03em;
}
table.data tbody tr:last-child td { border-bottom: none; }
table.data tbody tr:hover { background: rgba(79, 70, 229, 0.03); }

.keys-table { width: 100%; border-collapse: collapse; margin-top: 12px; }
.keys-table th, .keys-table td {
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

/* ---- Compact admin tables ------------------------------------------------ */
table.data.compact th,
table.data.compact td { padding: 6px 10px; font-size: 0.88em; }
table.data.compact code { font-size: 0.85em; }

table.data .sub-row td {
  padding-top: 4px;
  padding-bottom: 12px;
  border-top: none;
  background: var(--surface-2);
}
table.data .sub-row code {
  display: inline-block;
  max-width: 100%;
  word-break: break-all;
  font-size: 0.8em;
  color: var(--fg-soft);
}
table.data .sub-row .copy-btn { margin-left: 8px; }

/* ============================================================================
 * Badges
 * ========================================================================== */
.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.78em; font-weight: 500; }
.badge.ok   { background: var(--success-bg); color: var(--success-fg); }
.badge.warn { background: var(--warn-bg); color: var(--warn-fg); }
.badge.bad  { background: var(--danger-bg); color: var(--danger-fg); }
.badge.info { background: var(--info-bg); color: var(--info-fg); }

.inline-form { display: inline-flex; gap: 6px; align-items: center; }

/* ============================================================================
 * Progress bar (quota usage)
 * ========================================================================== */
.progress {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 6px;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #6366f1);
  border-radius: 999px;
  transition: width .4s ease;
}
.progress-bar.ok     { background: linear-gradient(90deg, var(--accent), #34d399); }
.progress-bar.warn   { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.progress-bar.danger { background: linear-gradient(90deg, #ef4444, #f87171); }

.progress-bar { background: var(--border); padding: 0; }
.progress-fill { height: 100%; border-radius: 999px; transition: width .4s ease; background: linear-gradient(90deg, var(--primary), #6366f1); }
.progress-fill.ok     { background: linear-gradient(90deg, var(--accent), #34d399); }
.progress-fill.warn   { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.progress-fill.danger { background: linear-gradient(90deg, #ef4444, #f87171); }

.quota-panel { display: flex; flex-direction: column; gap: 10px; }
.quota-summary { display: flex; align-items: center; justify-content: space-between; }
.quota-numbers strong { font-size: 1.4em; color: var(--fg); }
.quota-meta { font-size: 0.85em; color: var(--muted); }
.quota-spark { display: flex; align-items: flex-end; gap: 3px; height: 28px; padding-top: 4px; }
.spark-bar { width: 10px; background: #c7d2fe; border-radius: 2px 2px 0 0; min-height: 2px; }
.spark-bar.today { background: var(--primary); }

.audit-log pre {
  white-space: pre-wrap;
  word-break: break-all;
  background: #0f172a;
  color: #e2e8f0;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 0.85em;
  max-height: 240px;
  overflow: auto;
  border: 1px solid #1e293b;
}

.pagination { display: flex; gap: 6px; margin-top: 14px; align-items: center; }
.pagination .info { color: var(--muted); }

.field-row { display: grid; grid-template-columns: 130px 1fr; gap: 12px; align-items: center; margin-bottom: 10px; }
.field-row label { color: var(--fg-soft); font-size: 0.9em; font-weight: 500; }
.field-row input, .field-row textarea {
  padding: 8px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font: inherit;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field-row input:focus, .field-row textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
}

/* ============================================================================
 * Stats grid (admin dashboard)
 * ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}
@media (max-width: 900px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.stat:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat .label {
  color: var(--muted);
  font-size: 0.82em;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.stat .value {
  font-size: 1.7em;
  font-weight: 700;
  color: var(--fg);
  margin-top: 4px;
  letter-spacing: -0.02em;
}

/* ============================================================================
 * Admin nav
 * ========================================================================== */
.admin-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
  padding: 12px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.admin-nav .brand {
  font-weight: 700;
  margin-right: 18px;
  padding-right: 18px;
  border-right: 1px solid var(--border);
  color: var(--fg);
  font-size: 1.1em;
}
.admin-nav a {
  color: var(--fg-soft);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.92em;
  font-weight: 500;
  transition: background .15s ease, color .15s ease;
}
.admin-nav a:hover { background: var(--primary-soft); color: var(--primary); }
.admin-nav .right {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.88em;
}
.admin-nav .right a { padding: 0; color: var(--fg-soft); }
.admin-nav .right a:hover { background: none; color: var(--primary); }

/* ============================================================================
 * Auth pages (login / signup / change_password)
 * ========================================================================== */
.auth-wrap {
  max-width: 420px;
  margin: 56px auto 0;
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 36px 32px;
  box-shadow: var(--shadow);
}
.auth-card h1 {
  text-align: center;
  margin: 0 0 4px;
  font-size: 1.6rem;
}
.auth-card .auth-sub {
  text-align: center;
  color: var(--muted);
  font-size: 0.92em;
  margin: 0 0 24px;
}
.auth-card .form { max-width: 100%; }
.auth-card button[type="submit"] { width: 100%; padding: 12px; margin-top: 6px; font-size: 1em; }
.auth-card .auth-foot {
  text-align: center;
  margin-top: 18px;
  font-size: 0.92em;
  color: var(--muted);
}

/* ============================================================================
 * Footer layout — two-column on wide screens, stacked on narrow
 * ========================================================================== */
footer .footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
footer .footer-brand {
  font-size: 0.95em;
  color: var(--fg-soft);
  font-weight: 500;
}
footer .footer-meta { display: flex; flex-direction: column; gap: 4px; align-items: flex-end; text-align: right; }
footer .beian .dot { margin: 0 4px; color: var(--muted); }
@media (max-width: 640px) {
  footer .footer-inner { flex-direction: column; align-items: flex-start; }
  footer .footer-meta { align-items: flex-start; text-align: left; }
}

/* ============================================================================
 * Container shell used by index/pricing hero blocks
 * ========================================================================== */
.section { margin-top: 28px; }
.section h2 { margin-bottom: 14px; }