/* USCIS Case Tracker — design system. Vanilla CSS, no frameworks. */

:root {
  color-scheme: light dark;

  /* --- spacing scale (8px rhythm) --- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;

  /* --- type scale --- */
  --fs-xs: 0.78rem;
  --fs-sm: 0.875rem;
  --fs-base: 0.95rem;
  --fs-md: 1rem;
  --fs-lg: 1.15rem;
  --fs-xl: 1.4rem;
  --fs-2xl: 1.85rem;

  /* --- radius --- */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-pill: 999px;

  /* --- light palette --- */
  --fg: #1a2331;
  --fg-strong: #0a121d;
  --fg-muted: #5a6573;
  --fg-subtle: #8b95a2;
  --bg: #f3f5f9;
  --bg-elev: #ffffff;
  --bg-subtle: #eef1f6;
  --bg-hover: #e7ecf2;
  --border: #dce1ea;
  --border-strong: #c5cbd6;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-fg: #ffffff;
  --accent-soft: #dbeafe;

  --severity-high-fg: #b91c1c;
  --severity-high-bg: #fee2e2;
  --severity-high-border: #fca5a5;
  --severity-medium-fg: #b45309;
  --severity-medium-bg: #fef3c7;
  --severity-medium-border: #fcd34d;
  --severity-low-fg: #15803d;
  --severity-low-bg: #dcfce7;
  --severity-low-border: #86efac;
  --severity-silent-fg: #5b6471;
  --severity-silent-bg: #e7eaf0;
  --severity-silent-border: #c5cbd6;

  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-md: 0 1px 3px 0 rgba(15, 23, 42, 0.07), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.06);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --fg-strong: #f0f6fc;
    --fg-muted: #9aa6b3;
    --fg-subtle: #6e7681;
    --bg: #0d1117;
    --bg-elev: #161b22;
    --bg-subtle: #1c232c;
    --bg-hover: #232a33;
    --border: #2d3743;
    --border-strong: #3e4855;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-fg: #0d1117;
    --accent-soft: #1e3a5f;
    --severity-high-fg: #fca5a5;
    --severity-high-bg: #3a1717;
    --severity-high-border: #7f1d1d;
    --severity-medium-fg: #fcd34d;
    --severity-medium-bg: #3a2b0c;
    --severity-medium-border: #92400e;
    --severity-low-fg: #86efac;
    --severity-low-bg: #14301f;
    --severity-low-border: #166534;
    --severity-silent-fg: #9aa6b3;
    --severity-silent-bg: #1c232c;
    --severity-silent-border: #3e4855;
    --danger: #f87171;
    --danger-soft: #3a1717;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  }
}

/* ===== reset + base ===== */
*, *::before, *::after { box-sizing: border-box; }
[x-cloak] { display: none !important; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
    "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  font-size: var(--fs-base);
  line-height: 1.55;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

code, pre, kbd, samp {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}
code {
  background: var(--bg-subtle);
  padding: 1px 6px;
  border-radius: var(--r-sm);
  font-size: 0.88em;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--fg-strong);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

p { margin: 0; }
ul { list-style: none; padding: 0; margin: 0; }

/* ===== form controls ===== */
input, select, textarea {
  background: var(--bg-elev);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 10px 12px;
  font: inherit;
  font-size: var(--fs-base);
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:hover, select:hover, textarea:hover { border-color: var(--border-strong); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
input::placeholder { color: var(--fg-subtle); }

label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--fg-muted);
  margin-bottom: var(--sp-2);
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  background: var(--bg-elev);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 8px 14px;
  cursor: pointer;
  font: inherit;
  font-size: var(--fs-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
button:hover { background: var(--bg-hover); border-color: var(--border-strong); }
button:active { transform: translateY(1px); }
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
button.primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button.danger {
  color: var(--danger);
  border-color: var(--border);
}
button.danger:hover { background: var(--danger-soft); border-color: var(--danger); }
button.ghost {
  background: transparent;
  border-color: transparent;
}
button.ghost:hover { background: var(--bg-hover); }
button.icon {
  padding: 6px 10px;
  min-width: 32px;
}
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ===== login screen ===== */
.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--sp-5);
  background: radial-gradient(ellipse at top, var(--accent-soft) 0%, var(--bg) 50%);
}
.login-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-6);
  width: 100%;
  max-width: 380px;
}
.login-card h1 {
  font-size: var(--fs-xl);
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--sp-2);
}
.login-card .subtitle {
  text-align: center;
  color: var(--fg-muted);
  font-size: var(--fs-sm);
  margin-bottom: var(--sp-5);
}
.login-card form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.login-card form .field { margin-bottom: 0; }
.login-card form > button { margin-top: var(--sp-2); }
.login-card .error {
  color: var(--danger);
  background: var(--danger-soft);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  margin-top: var(--sp-2);
}
.login-card .lang-switch {
  margin-top: var(--sp-5);
  text-align: center;
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}
.login-card .lang-switch button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  padding: 0 var(--sp-1);
}

/* ===== app shell ===== */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header.app-header {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-3) var(--sp-5);
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}
header.app-header .brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--fg-strong);
  white-space: nowrap;
}
header.app-header .brand .logo {
  width: 32px;
  height: 32px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  display: grid;
  place-items: center;
  color: white;
  font-size: 18px;
}

nav.tabs {
  display: flex;
  gap: var(--sp-1);
  flex: 1;
}
nav.tabs button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--fg-muted);
  padding: 8px 14px;
  font-size: var(--fs-sm);
  font-weight: 500;
}
nav.tabs button:hover {
  color: var(--fg);
  background: var(--bg-hover);
}
nav.tabs button.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: transparent;
}

header.app-header .session-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-left: auto;
}
header.app-header .session-actions .username {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}

main {
  flex: 1;
  padding: var(--sp-6) var(--sp-5);
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

/* ===== card ===== */
section.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-5) var(--sp-6);
  margin-bottom: var(--sp-5);
}
section.card > .card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
  flex-wrap: wrap;
}
section.card .card-title {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
section.card h2 {
  font-size: var(--fs-xl);
  font-weight: 600;
}
section.card .card-subtitle {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}
section.card h3 {
  font-size: var(--fs-md);
  font-weight: 600;
  margin: var(--sp-5) 0 var(--sp-3);
}

/* ===== KPI grid ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
}
.kpi {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-5);
}
.kpi .label {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  margin-bottom: var(--sp-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.kpi .value {
  font-size: var(--fs-2xl);
  font-weight: 600;
  color: var(--fg-strong);
}
.kpi .value.subtle {
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--fg-muted);
}

/* ===== tables ===== */
.table-wrap {
  overflow-x: auto;
  margin: 0 calc(var(--sp-6) * -1);
  padding: 0 var(--sp-6);
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: var(--fs-sm);
}
table th, table td {
  padding: var(--sp-3) var(--sp-3);
  text-align: left;
  vertical-align: middle;
  border-bottom: 1px solid var(--border);
}
table th {
  font-weight: 600;
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: transparent;
  border-bottom: 1px solid var(--border-strong);
}
table tbody tr {
  transition: background 0.1s;
}
table tbody tr:hover {
  background: var(--bg-subtle);
}
table tr:last-child td { border-bottom: none; }
table .actions {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
  justify-content: flex-end;
}
table td.muted-meta {
  color: var(--fg-muted);
  font-size: var(--fs-xs);
}
table td .nickname {
  display: block;
  margin-top: var(--sp-1);
  font-size: var(--fs-xs);
  color: var(--fg-muted);
}

/* ===== severity pill ===== */
.sev {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 3px 10px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.sev::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.sev-high {
  color: var(--severity-high-fg);
  background: var(--severity-high-bg);
  border-color: var(--severity-high-border);
}
.sev-medium {
  color: var(--severity-medium-fg);
  background: var(--severity-medium-bg);
  border-color: var(--severity-medium-border);
}
.sev-low {
  color: var(--severity-low-fg);
  background: var(--severity-low-bg);
  border-color: var(--severity-low-border);
}
.sev-silent {
  color: var(--severity-silent-fg);
  background: var(--severity-silent-bg);
  border-color: var(--severity-silent-border);
}

/* ===== empty state ===== */
.empty-state {
  text-align: center;
  padding: var(--sp-7) var(--sp-5);
  color: var(--fg-muted);
}
.empty-state .icon {
  font-size: 2.4rem;
  display: block;
  margin-bottom: var(--sp-3);
  opacity: 0.6;
}
.empty-state .title {
  color: var(--fg);
  font-size: var(--fs-md);
  font-weight: 500;
  margin-bottom: var(--sp-2);
}
.empty-state .desc {
  font-size: var(--fs-sm);
  max-width: 380px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== modal ===== */
.modal-bg {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: var(--sp-5);
  overflow-y: auto;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: modal-bg-in 0.15s ease;
}
@keyframes modal-bg-in { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--sp-6);
  width: 100%;
  max-width: 480px;
  max-height: 92vh;
  overflow-y: auto;
  animation: modal-in 0.18s ease;
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal h3 {
  font-size: var(--fs-lg);
  font-weight: 600;
  margin-bottom: var(--sp-2);
}
.modal .modal-subtitle {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
  margin-bottom: var(--sp-5);
}
.modal .field { margin-bottom: var(--sp-4); }
.modal .field-help {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  margin-top: var(--sp-1);
}
.modal .footer {
  display: flex;
  gap: var(--sp-2);
  justify-content: flex-end;
  margin-top: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
}

/* ===== detail panel (slide-out) ===== */
.detail-bg {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  z-index: 90;
  backdrop-filter: blur(2px);
}
.detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(720px, 100%);
  background: var(--bg);
  z-index: 91;
  overflow-y: auto;
  padding: var(--sp-5) var(--sp-6);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-xl);
  animation: panel-in 0.22s ease;
}
@keyframes panel-in {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}
.detail-panel header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--border);
}
.detail-panel header h2 {
  font-size: var(--fs-xl);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.detail-panel header .meta {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
  margin-top: var(--sp-1);
}

/* ===== timeline ===== */
.timeline { padding: 0; }
.timeline li {
  position: relative;
  padding: var(--sp-3) 0 var(--sp-3) var(--sp-5);
  border-left: 2px solid var(--border);
  margin-left: 6px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: var(--shadow-sm);
}
.timeline li.terminal::before { background: var(--severity-high-fg); }
.timeline .row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}
.timeline .code {
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--fg-strong);
}
.timeline .meta {
  font-size: var(--fs-xs);
  color: var(--fg-muted);
  margin-top: var(--sp-2);
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}
.timeline .meta-item { display: inline-flex; gap: 4px; }

/* ===== toast ===== */
.toast {
  position: fixed;
  bottom: var(--sp-5);
  right: var(--sp-5);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-xl);
  padding: var(--sp-4) var(--sp-7) var(--sp-4) var(--sp-4);
  max-width: 420px;
  z-index: 200;
  animation: toast-in 0.2s ease;
}
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.toast.changed { border-left-color: var(--severity-medium-fg); }
.toast.unchanged { border-left-color: var(--severity-silent-fg); }
.toast.deferred { border-left-color: var(--severity-medium-fg); }
.toast.failed { border-left-color: var(--danger); }
.toast.skipped { border-left-color: var(--severity-silent-fg); }
.toast .title {
  font-weight: 600;
  font-size: var(--fs-md);
  margin-bottom: var(--sp-1);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.toast .summary {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}
.toast .error {
  font-size: var(--fs-xs);
  color: var(--danger);
  margin-top: var(--sp-2);
  word-break: break-word;
}
.toast .close {
  position: absolute;
  top: var(--sp-2);
  right: var(--sp-2);
  background: none;
  border: none;
  color: var(--fg-muted);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
}
.toast .close:hover { background: var(--bg-hover); color: var(--fg); }

/* ===== history sub-tabs (separate component, not main nav) ===== */
.subtabs {
  display: inline-flex;
  background: var(--bg-subtle);
  border-radius: var(--r-md);
  padding: 4px;
  gap: 0;
}
.subtabs button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--fg-muted);
  font-size: var(--fs-sm);
  padding: 6px 14px;
  font-weight: 500;
}
.subtabs button:hover { background: transparent; color: var(--fg); border-color: transparent; }
.subtabs button.active {
  background: var(--bg-elev);
  color: var(--fg-strong);
  box-shadow: var(--shadow-sm);
}

/* ===== settings list rows ===== */
.settings-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 220px);
  gap: var(--sp-5);
  align-items: start;
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--border);
}
.settings-row:last-child { border-bottom: none; }
.settings-row .label {
  font-weight: 500;
  color: var(--fg);
  font-size: var(--fs-base);
  margin-bottom: 0;
}
.settings-row .desc {
  display: block;
  margin-top: var(--sp-1);
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}
.settings-row .control {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  justify-content: flex-end;
}

/* ===== switch (toggle) ===== */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}
.switch input { display: none; }
.switch .slider {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background 0.18s;
}
.switch .slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.18s;
  box-shadow: var(--shadow-sm);
}
.switch input:checked + .slider { background: var(--accent); }
.switch input:checked + .slider::before { transform: translateX(18px); }

/* ===== utility classes ===== */
.flex { display: flex; gap: var(--sp-2); align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: var(--sp-3); }
.muted { color: var(--fg-muted); }
.subtle { color: var(--fg-subtle); }
.text-xs { font-size: var(--fs-xs); }
.text-sm { font-size: var(--fs-sm); }
.text-strong { color: var(--fg-strong); font-weight: 500; }
.dim { opacity: 0.6; }
.spinner-inline {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== mobile ===== */
@media (max-width: 720px) {
  header.app-header { padding: var(--sp-2) var(--sp-3); gap: var(--sp-3); }
  nav.tabs { order: 3; flex-basis: 100%; overflow-x: auto; }
  main { padding: var(--sp-4) var(--sp-3); }
  section.card { padding: var(--sp-4); }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .settings-row { grid-template-columns: 1fr; gap: var(--sp-3); }
  .settings-row .control { justify-content: flex-start; }
  .table-wrap { margin: 0 calc(var(--sp-4) * -1); padding: 0 var(--sp-4); }
}