:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a28;
  --bg-input: #15151f;
  --border: #1e1e2e;
  --border-focus: #3b3b5c;
  --text: #e4e4e7;
  --text-dim: #71717a;
  --text-muted: #52525b;
  --primary: #8b5cf6;
  --primary-hover: #7c3aed;
  --primary-glow: rgba(139, 92, 246, 0.15);
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --accent: #06b6d4;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.app { max-width: 1280px; margin: 0 auto; padding: 16px 20px; }

/* ── Header ────────────────────────────────── */

.header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 0; border-bottom: 1px solid var(--border); margin-bottom: 20px;
}
.header h1 {
  font-size: 22px; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.header-left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.header-right { display: flex; gap: 8px; }

.badge {
  padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 600;
  background: var(--success-bg); color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.25);
}
.badge.offline { background: var(--danger-bg); color: var(--danger); border-color: rgba(239, 68, 68, 0.25); }
.badge-time {
  background: var(--bg-card-hover); color: var(--text-dim);
  border-color: var(--border); font-family: 'SF Mono', 'Fira Code', monospace; font-size: 11px;
}

/* ── Buttons ───────────────────────────────── */

.btn {
  padding: 8px 16px; border: none; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600; cursor: pointer;
  transition: all var(--transition); display: inline-flex; align-items: center; gap: 6px;
  white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px var(--primary-glow); }
.btn-secondary { background: var(--bg-card-hover); color: var(--text-dim); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { color: var(--text); border-color: var(--border-focus); background: var(--border); }
.btn-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.25); }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }

/* ── Tabs ──────────────────────────────────── */

.tabs {
  display: flex; gap: 2px; margin-bottom: 20px;
  background: var(--bg-card); padding: 3px; border-radius: 10px;
  border: 1px solid var(--border);
}
.tab {
  padding: 9px 16px; border: none; background: none; color: var(--text-dim);
  font-size: 13px; font-weight: 500; cursor: pointer; border-radius: 8px;
  transition: all var(--transition); flex: 1; text-align: center;
}
.tab.active { background: var(--primary); color: white; }
.tab:hover:not(.active) { color: var(--text); background: var(--bg-card-hover); }

.tab-content { display: none; animation: fadeIn 0.25s ease; }
.tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ── Cards ─────────────────────────────────── */

.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 14px; transition: border-color var(--transition);
}
.card:hover { border-color: var(--border-focus); }
.card h3 { font-size: 14px; font-weight: 600; margin-bottom: 14px; color: var(--text-dim); letter-spacing: 0.3px; }
.card-header-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.card-header-row h3 { margin-bottom: 0; }

.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── Forms ─────────────────────────────────── */

.form-group { margin-bottom: 14px; }
.form-group label { display: block; margin-bottom: 5px; font-size: 12px; color: var(--text-dim); font-weight: 500; }
.hint { color: var(--text-muted); font-weight: 400; }

.select, .input, .textarea {
  width: 100%; padding: 9px 12px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 13px;
  font-family: inherit; transition: border-color var(--transition);
}
.select:focus, .input:focus, .textarea:focus { outline: none; border-color: var(--primary); }
.textarea { resize: vertical; line-height: 1.6; }
.input[readonly], .textarea[readonly] { color: var(--text-dim); }

/* ── Grid Layouts ──────────────────────────── */

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 14px; }

/* ── Stats ─────────────────────────────────── */

.stat-card { text-align: center; padding: 20px; }
.stat-label {
  font-size: 11px; color: var(--text-dim); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.8px; font-weight: 600;
}
.stat-value {
  font-size: 32px; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

/* ── Schedule ──────────────────────────────── */

.schedule-grid { display: flex; gap: 10px; flex-wrap: wrap; }
.schedule-item {
  flex: 1; min-width: 160px; padding: 14px; border-radius: 10px;
  background: var(--bg-card-hover); border: 1px solid var(--border); text-align: center;
  transition: all var(--transition);
}
.schedule-item.posted { border-color: var(--success); background: var(--success-bg); }
.schedule-time { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.schedule-window { font-size: 12px; color: var(--text-dim); }
.schedule-status { font-size: 11px; color: var(--text-muted); margin-top: 6px; font-weight: 600; }
.schedule-item.posted .schedule-status { color: var(--success); }

/* ── Pages ─────────────────────────────────── */

.pages-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.page-card { padding: 16px; }
.page-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.page-name { font-size: 15px; font-weight: 600; }
.page-id { font-size: 11px; color: var(--text-muted); font-family: monospace; }
.page-sample { width: 44px; height: 44px; border-radius: 8px; object-fit: cover; border: 2px solid var(--border); }
.page-actions { margin-top: 12px; display: flex; gap: 6px; }

/* ── Activity ──────────────────────────────── */

.activity-list { display: flex; flex-direction: column; gap: 6px; }
.activity-item {
  padding: 10px 12px; border-radius: var(--radius-sm); background: var(--bg-card-hover);
  font-size: 13px; display: flex; justify-content: space-between; align-items: center;
}
.activity-time { color: var(--text-muted); font-size: 11px; white-space: nowrap; }

/* ── History ───────────────────────────────── */

.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item {
  display: flex; align-items: center; gap: 14px; padding: 14px;
  background: var(--bg-card-hover); border: 1px solid var(--border); border-radius: 10px;
  transition: border-color var(--transition);
}
.history-item:hover { border-color: var(--border-focus); }
.h-image { width: 56px; height: 56px; border-radius: 8px; object-fit: cover; flex-shrink: 0; }
.h-content { flex: 1; min-width: 0; }
.h-page { font-size: 11px; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.h-topic { font-size: 13px; font-weight: 600; margin: 3px 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.h-time { font-size: 11px; color: var(--text-muted); }
.history-status {
  padding: 3px 10px; border-radius: 10px; font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.5px; flex-shrink: 0;
}
.history-status.success { background: var(--success-bg); color: var(--success); }
.history-status.failed { background: var(--danger-bg); color: var(--danger); }

/* ── Preview ───────────────────────────────── */

.preview-image-box {
  border-radius: 10px; overflow: hidden; background: var(--bg);
  border: 1px solid var(--border); margin-bottom: 10px;
}
.preview-image-box img { width: 100%; display: block; }
.preview-meta { font-size: 11px; color: var(--text-muted); }

.loading-box {
  display: flex; align-items: center; gap: 12px; padding: 20px;
  background: var(--bg-card-hover); border-radius: var(--radius-sm); margin-top: 12px;
  color: var(--text-dim); font-size: 13px;
}

/* ── Setup Tab ─────────────────────────────── */

.status-grid { display: flex; flex-direction: column; gap: 8px; }
.status-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 12px; background: var(--bg-card-hover); border-radius: var(--radius-sm);
  font-size: 13px;
}
.status-key { color: var(--text-dim); font-weight: 500; }
.status-val { font-family: 'SF Mono', 'Fira Code', monospace; font-size: 12px; }
.status-val.ok { color: var(--success); }
.status-val.err { color: var(--danger); }
.status-val.warn { color: var(--warning); }

.samples-grid { display: flex; gap: 12px; flex-wrap: wrap; }
.sample-card {
  text-align: center; padding: 10px; border-radius: var(--radius-sm);
  background: var(--bg-card-hover); border: 1px solid var(--border);
}
.sample-card img {
  width: 120px; height: 120px; object-fit: cover; border-radius: 6px;
  border: 1px solid var(--border); margin-bottom: 6px;
}
.sample-card .sample-name { font-size: 11px; color: var(--text-dim); }

.test-grid { display: flex; flex-direction: column; gap: 10px; }
.test-item {
  display: flex; align-items: flex-start; gap: 10px; padding: 10px 12px;
  background: var(--bg-card-hover); border-radius: var(--radius-sm);
}
.test-label { font-size: 13px; font-weight: 500; min-width: 130px; padding-top: 4px; }
.test-result {
  flex: 1; font-size: 11px; font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--text-dim); white-space: pre-wrap; word-break: break-all;
  max-height: 120px; overflow-y: auto; margin: 0;
}

.config-grid { display: flex; flex-direction: column; gap: 6px; }
.config-row {
  display: flex; gap: 12px; padding: 8px 12px;
  background: var(--bg-card-hover); border-radius: var(--radius-sm); font-size: 12px;
}
.config-key { color: var(--text-dim); font-weight: 500; min-width: 140px; }
.config-val { color: var(--text); font-family: 'SF Mono', 'Fira Code', monospace; word-break: break-all; }

/* ── Toast ─────────────────────────────────── */

.toast {
  position: fixed; bottom: 20px; right: 20px; padding: 12px 20px; border-radius: 10px;
  background: var(--bg-card); border: 1px solid var(--border); box-shadow: var(--shadow);
  font-size: 13px; transform: translateY(100px); opacity: 0;
  transition: all 0.3s; z-index: 999; max-width: 400px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ── Loading ───────────────────────────────── */

.loading { text-align: center; padding: 30px; color: var(--text-muted); font-size: 13px; }
.spinner {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin 0.7s linear infinite; flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ────────────────────────────── */

@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .app { padding: 12px; }
  .grid-3 { grid-template-columns: 1fr; }
  .pages-grid { grid-template-columns: 1fr; }
  .header { flex-direction: column; gap: 10px; align-items: flex-start; }
  .tabs { overflow-x: auto; }
  .tab { padding: 8px 12px; font-size: 12px; min-width: 0; }
  .schedule-grid { flex-direction: column; }
}