:root {
  --bg: #f4f6fb;
  --bg-grad: radial-gradient(1100px 500px at 10% -10%, #e0e7ff 0%, transparent 60%),
             radial-gradient(900px 500px at 100% 0%, #fae8ff 0%, transparent 55%);
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --green: #059669;
  --green-soft: #ecfdf5;
  --amber: #b45309;
  --amber-soft: #fffbeb;
  --red: #dc2626;
  --red-soft: #fef2f2;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 8px 24px -12px rgba(15, 23, 42, .12);
  --radius: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-grad: radial-gradient(1100px 500px at 10% -10%, #1e1b4b 0%, transparent 60%),
               radial-gradient(900px 500px at 100% 0%, #3b0764 0%, transparent 55%);
    --panel: #111827;
    --panel-soft: #0f172a;
    --ink: #e5e7eb;
    --muted: #94a3b8;
    --line: #1f2937;
    --accent: #818cf8;
    --accent-soft: #1e1b4b;
    --green: #34d399;
    --green-soft: #052e2b;
    --amber: #fbbf24;
    --amber-soft: #2a1c05;
    --red: #f87171;
    --red-soft: #2a0a0a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 30px -16px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  font-size: 14px;
  line-height: 1.5;
}

button, input, select { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 68px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  backdrop-filter: blur(14px);
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  font-weight: 800;
  letter-spacing: -.5px;
  font-size: 14px;
  box-shadow: 0 8px 18px -8px rgba(99, 102, 241, .8);
}

.brand-mark.large {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  font-size: 18px;
  margin: 0 auto 14px;
}

.brand-title { font-weight: 700; font-size: 15px; letter-spacing: -.2px; }
.brand-sub { color: var(--muted); font-size: 11.5px; margin-top: 1px; }
.topbar-actions { display: flex; gap: 8px; }

/* ---------- layout ---------- */

.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: 30px 28px 64px;
  animation: rise .22s ease-out;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.muted { color: var(--muted); }

h1, h2, h3, p { margin: 0; }
h2 { font-size: 22px; letter-spacing: -.4px; }
h3 { font-size: 15px; letter-spacing: -.2px; }

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 30px;
}

.stat-card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.stat-label { color: var(--muted); font-size: 12px; }
.stat-value { display: block; font-size: 30px; line-height: 1.15; margin-top: 6px; letter-spacing: -1px; }
.stat-online { color: var(--green); }
.stat-paused { color: var(--amber); }

/* ---------- section head ---------- */

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.section-head p { margin-top: 4px; font-size: 12.5px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, opacity .15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 18px -10px color-mix(in srgb, var(--accent) 70%, transparent);
}
.btn-primary:hover { filter: brightness(1.06); }

.btn-ghost {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--panel-soft); }

.btn-danger-ghost {
  color: var(--red);
  border-color: transparent;
}
.btn-danger-ghost:hover { background: var(--red-soft); }

.btn-block { width: 100%; }

.back-link {
  border: 0;
  background: none;
  color: var(--muted);
  padding: 0;
  margin-bottom: 18px;
  cursor: pointer;
  font-weight: 600;
}
.back-link:hover { color: var(--accent); }

/* ---------- device grid ---------- */

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}

.device-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.device-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
  box-shadow: 0 16px 34px -18px rgba(15, 23, 42, .3);
}

.device-thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #e0e7ff, #f5f3ff);
  cursor: pointer;
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  .device-thumb { background: linear-gradient(135deg, #1e1b4b, #111827); }
}

.device-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .35s ease;
}

.device-card:hover .device-thumb img { transform: scale(1.02); }

.thumb-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: color-mix(in srgb, var(--muted) 80%, transparent);
  font-size: 12px;
  letter-spacing: .5px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: var(--panel-soft);
  color: var(--muted);
  border: 1px solid var(--line);
}

.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.status-pill.online { color: var(--green); background: var(--green-soft); border-color: transparent; }
.status-pill.offline { color: var(--muted); }
.status-pill.paused,
.status-pill.pending { color: var(--amber); background: var(--amber-soft); border-color: transparent; }

.device-thumb .status-pill {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(6px);
}

@media (prefers-color-scheme: dark) {
  .device-thumb .status-pill { background: rgba(17, 24, 39, .82); }
}

.device-body { padding: 14px 16px 16px; }

.device-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: space-between;
}

.device-title-row h3 {
  font-size: 15.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.enroll-badge {
  flex: none;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 10.5px;
  font-weight: 700;
}

.device-sub {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }

.chip {
  padding: 3px 8px;
  border-radius: 7px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 11.5px;
}

.chip strong { color: var(--ink); font-weight: 650; }

.device-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
}

.last-seen { color: var(--muted); font-size: 11.5px; }
.device-actions { display: flex; gap: 6px; }
.device-actions .btn { min-height: 32px; padding: 5px 10px; font-size: 12px; }

/* ---------- empty state ---------- */

.empty-state {
  padding: 64px 24px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 60%, transparent);
}
.empty-state.small { padding: 32px; }
.empty-state h3 { margin: 10px 0 6px; font-size: 17px; }
.empty-state p { color: var(--muted); max-width: 420px; margin: 0 auto 18px; font-size: 13px; }
.empty-icon { font-size: 31px; color: color-mix(in srgb, var(--accent) 70%, var(--muted)); }

/* ---------- detail ---------- */

.detail-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.detail-title-row { display: flex; align-items: center; gap: 10px; }
.detail-title-row h2 { font-size: 26px; }
.detail-head p { margin-top: 4px; font-size: 12.5px; }
.detail-actions { display: flex; gap: 8px; }

.enroll-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 20px;
  margin-bottom: 18px;
  border: 1px solid color-mix(in srgb, var(--amber) 35%, var(--line));
  border-radius: 14px;
  background: var(--amber-soft);
}
.enroll-banner p { margin-top: 3px; font-size: 12.5px; max-width: 640px; }
.enroll-code {
  flex: none;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--amber);
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, .9fr);
  gap: 18px;
  align-items: start;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}
.panel-head .muted { font-size: 12px; }

.latest-frame {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 280px;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(45deg, color-mix(in srgb, var(--panel-soft) 80%, var(--line)) 25%, transparent 25%),
    linear-gradient(-45deg, color-mix(in srgb, var(--panel-soft) 80%, var(--line)) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--panel-soft) 80%, var(--line)) 75%),
    linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--panel-soft) 80%, var(--line)) 75%);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
  border-bottom: 1px solid var(--line);
}

.latest-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  cursor: zoom-in;
}

.frame-empty { text-align: center; padding: 24px; }
.frame-empty p { font-size: 13px; }
.frame-empty .muted { font-size: 12px; margin-top: 4px; }

.device-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: var(--panel-soft);
}

.meta-item {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  padding: 4px 9px;
  border-radius: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 11.5px;
}
.meta-item strong { color: var(--ink); font-weight: 650; }

/* ---------- settings ---------- */

.settings-panel .form { padding: 16px 18px 6px; display: grid; gap: 14px; }

.field { display: grid; gap: 6px; }
.field > span { font-size: 12px; font-weight: 650; color: var(--ink); }
.field > small { font-size: 11px; }

.field input, .field select {
  width: 100%;
  min-height: 40px;
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel-soft);
  color: var(--ink);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

.field input:focus, .field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.form-actions { display: flex; gap: 8px; padding-top: 2px; }
.form-actions .btn { flex: 1; }

.settings-note {
  margin: 14px 18px 18px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}
.settings-note strong { color: var(--ink); font-size: 12px; }
.settings-note ul { margin: 6px 0 0; padding-left: 18px; }
.settings-note li { margin: 2px 0; }

/* ---------- timeline ---------- */

.timeline-panel { margin-top: 18px; }

.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
  padding: 16px 18px 18px;
}

.shot {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--panel-soft);
  cursor: zoom-in;
  transition: transform .15s ease, border-color .15s ease;
}
.shot:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.shot img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.shot-time {
  position: absolute;
  left: 6px;
  bottom: 6px;
  padding: 2px 6px;
  border-radius: 5px;
  background: rgba(15, 23, 42, .72);
  color: #fff;
  font-size: 10.5px;
  backdrop-filter: blur(4px);
}

/* ---------- login ---------- */

.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(10px);
}

.login-card {
  width: 100%;
  max-width: 380px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 30px 70px -30px rgba(15, 23, 42, .45);
  text-align: center;
}
.login-card h1 { font-size: 24px; letter-spacing: -.5px; }
.login-card > p { margin: 6px 0 20px; font-size: 12.5px; }
.login-card .field { text-align: left; margin-bottom: 14px; }
.login-error { color: var(--red); font-size: 12px; margin: 0 0 10px; }
.login-hint { margin-top: 16px !important; font-size: 11.5px; color: var(--muted); }
code {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
}

/* ---------- dialogs ---------- */

.dialog {
  width: min(440px, calc(100vw - 32px));
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 30px 80px -30px rgba(15, 23, 42, .5);
}
.dialog::backdrop { background: rgba(15, 23, 42, .45); backdrop-filter: blur(4px); }
.dialog h2 { font-size: 19px; }
.dialog > p { margin: 6px 0 18px; font-size: 12.5px; }
.dialog .field { margin-bottom: 18px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }

.code-box {
  padding: 18px;
  border: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--line));
  border-radius: 12px;
  background: var(--accent-soft);
  text-align: center;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 6px;
  color: var(--accent);
}

/* ---------- lightbox ---------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 40px;
  background: rgba(2, 6, 23, .9);
  backdrop-filter: blur(6px);
}
.lightbox img {
  max-width: 100%;
  max-height: calc(100vh - 110px);
  border-radius: 8px;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .8);
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 50%;
  background: rgba(255, 255, 255, .1);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
}
.lightbox-time {
  position: absolute;
  bottom: 22px;
  color: rgba(255, 255, 255, .75);
  font-size: 12px;
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 70;
  transform: translateX(-50%);
  padding: 10px 16px;
  border-radius: 10px;
  background: #0f172a;
  color: #fff;
  font-size: 12.5px;
  box-shadow: 0 18px 40px -18px rgba(0, 0, 0, .6);
  animation: toast-in .18s ease-out;
}
.toast.error { background: #b91c1c; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .detail-layout { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .topbar { padding: 0 16px; height: 60px; }
  .page { padding: 20px 16px 48px; }
  .stats { gap: 10px; }
  .stat-card { padding: 13px 14px; }
  .stat-value { font-size: 24px; }
  .section-head { align-items: center; }
  .section-head h2 { font-size: 19px; }
  .device-grid { grid-template-columns: 1fr; }
  .detail-head { flex-direction: column; }
  .enroll-banner { flex-direction: column; align-items: flex-start; }
  .timeline { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .lightbox { padding: 18px; }
}