:root {
    --app-header-height: 74px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.12);
    --transition: 0.2s ease;
}

body[data-theme="light"] {
    --bg: #f3f6fb;
    --bg-elevated: #ffffff;
    --bg-muted: #eef2f8;
    --bg-soft: #f8fafc;
    --text: #1f2937;
    --text-muted: #64748b;
    --text-soft: #94a3b8;
    --border: #dbe4f0;
    --border-strong: #c6d3e3;
    --primary: #4f46e5;
    --primary-strong: #4338ca;
    --primary-soft: rgba(79, 70, 229, 0.12);
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #f59e0b;
    --info: #0891b2;
    --card-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --overlay: rgba(15, 23, 42, 0.55);
}

body[data-theme="dark"] {
    --bg: #0f172a;
    --bg-elevated: #111827;
    --bg-muted: #162033;
    --bg-soft: #1e293b;
    --text: #e5eefb;
    --text-muted: #94a3b8;
    --text-soft: #64748b;
    --border: #243246;
    --border-strong: #334155;
    --primary: #818cf8;
    --primary-strong: #6366f1;
    --primary-soft: rgba(129, 140, 248, 0.18);
    --success: #22c55e;
    --danger: #f87171;
    --warning: #fbbf24;
    --info: #38bdf8;
    --card-gradient: linear-gradient(135deg, #312e81 0%, #4c1d95 100%);
    --overlay: rgba(2, 6, 23, 0.72);
    --shadow-sm: 0 2px 8px rgba(2, 6, 23, 0.35);
    --shadow-md: 0 16px 42px rgba(2, 6, 23, 0.42);
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background var(--transition), color var(--transition);
}
a { color: var(--primary); }
.app-shell { min-height: 100vh; }
.app-topbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--app-header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
    backdrop-filter: blur(16px);
}
.app-topbar-left, .app-topbar-right, .flex { display: flex; align-items: center; gap: 12px; }
.app-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    margin-right: 8px;
}
.app-brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--card-gradient);
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.app-brand strong { display: block; font-size: 15px; }
.app-brand small { display: block; color: var(--text-muted); font-size: 12px; }
.app-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.app-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text-muted);
    transition: background var(--transition), color var(--transition), transform var(--transition);
}
.app-nav-link:hover,
.app-nav-link.active {
    background: var(--primary-soft);
    color: var(--primary);
    transform: translateY(-1px);
}
.theme-toggle, .btn, .btn-icon {
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform var(--transition), filter var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}
.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--bg-muted);
    color: var(--text);
    border-color: var(--border);
}
.theme-toggle:hover, .btn:hover, .btn-icon:hover { transform: translateY(-1px); }
.user-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--bg-muted);
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-size: 14px;
}
.app-main { padding: 28px 0 48px; }
.container { width: min(1400px, calc(100% - 32px)); margin: 0 auto; }
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.page-title { margin: 0; font-size: 30px; letter-spacing: -0.02em; }
.page-subtitle, .muted, .text-muted { color: var(--text-muted); }
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 24px;
}
.card h2, .card h3 { margin-top: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.stat-card {
    background: var(--card-gradient);
    color: #fff;
    padding: 24px;
    border-radius: 18px;
    box-shadow: var(--shadow-md);
}
.stat { font-size: 34px; font-weight: 800; margin-top: 10px; }
.mb-3 { margin-bottom: 24px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 16px;
    border-radius: 12px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    box-shadow: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-strong); }
.btn-success { background: var(--success); color: #fff; }
.btn-secondary { background: var(--bg-muted); color: var(--text); border-color: var(--border); }
.btn-info { background: var(--info); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-compact { padding-inline: 14px; }
.btn-sm { padding: 7px 10px; font-size: 12px; border-radius: 10px; }
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--bg-muted);
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 700;
}
.badge-primary { background: var(--primary-soft); color: var(--primary); }
table { width: 100%; border-collapse: collapse; }
table th, table td {
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}
table th { color: var(--text-muted); font-size: 13px; font-weight: 700; background: transparent; }
.table-container { overflow-x: auto; }
.alert {
    border-radius: 14px;
    padding: 14px 16px;
    margin-bottom: 18px;
    border: 1px solid transparent;
}
.alert-error { background: color-mix(in srgb, var(--danger) 12%, var(--bg-elevated)); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, var(--border)); }
.alert-success { background: color-mix(in srgb, var(--success) 12%, var(--bg-elevated)); color: var(--success); border-color: color-mix(in srgb, var(--success) 30%, var(--border)); }
.alert-info { background: color-mix(in srgb, var(--info) 12%, var(--bg-elevated)); color: var(--info); border-color: color-mix(in srgb, var(--info) 30%, var(--border)); }
.input, .form-control, input[type="text"], input[type="email"], input[type="password"], input[type="number"], select, textarea {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--bg-soft);
    color: var(--text);
    border-radius: 12px;
    padding: 12px 14px;
    font: inherit;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
textarea { min-height: 120px; resize: vertical; }
.input:focus, .form-control:focus, input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent);
}
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--text); }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.modal {
    position: fixed;
    inset: 0;
    background: var(--overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 1200;
}
.modal-content {
    width: min(100%, 720px);
    max-height: calc(100vh - 48px);
    overflow: auto;
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow-md);
    padding: 24px;
}
.modal-header, .modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.modal-header { margin-bottom: 18px; }
.modal-footer { margin-top: 18px; justify-content: flex-end; }
.close-btn {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 28px;
    cursor: pointer;
}
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background:
        radial-gradient(circle at top left, color-mix(in srgb, var(--primary) 20%, transparent), transparent 35%),
        radial-gradient(circle at bottom right, color-mix(in srgb, var(--info) 18%, transparent), transparent 28%),
        var(--bg);
    position: relative;
}
.auth-theme-toggle {
    position: absolute;
    top: 18px;
    right: 18px;
}
.auth-card {
    width: min(100%, 460px);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    padding: 36px;
}
.auth-card.auth-card-wide { width: min(100%, 520px); }
.auth-logo { text-align: center; margin-bottom: 24px; }
.auth-logo-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    border-radius: 20px;
    display: grid;
    place-items: center;
    background: var(--card-gradient);
    color: #fff;
    font-size: 28px;
    box-shadow: var(--shadow-sm);
}
.auth-logo h1 { margin: 0 0 8px; font-size: 28px; }
.auth-logo p { margin: 0; color: var(--text-muted); }
.step-indicator, .step-bar { display: flex; justify-content: center; gap: 8px; margin-bottom: 24px; }
.step-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--border-strong);
}
.step-dot.active { background: var(--primary); }
.otp-grid { display: flex; justify-content: center; gap: 8px; margin: 12px 0 20px; }
.otp-cell {
    width: 50px;
    height: 58px;
    text-align: center;
    font-size: 26px;
    font-weight: 700;
    border-radius: 14px;
}
.auth-links, .links {
    margin-top: 18px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}
.auth-links a, .links a { text-decoration: none; }
.pw-hint { color: var(--text-muted); font-size: 13px; margin-top: 6px; }
.inline-form { display: inline; }
.resend-btn {
    background: none;
    border: none;
    color: var(--primary);
    font: inherit;
    cursor: pointer;
    padding: 0;
}
.section-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.theme-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.theme-choice {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    background: var(--bg-soft);
}
.theme-choice input { width: auto; margin-right: 8px; }
.theme-preview {
    margin-top: 10px;
    border-radius: 14px;
    border: 1px solid var(--border);
    overflow: hidden;
    font-size: 12px;
}
.theme-preview-header { padding: 10px 12px; background: color-mix(in srgb, var(--primary) 16%, var(--bg-soft)); }
.theme-preview-body { padding: 12px; display: grid; gap: 8px; background: var(--bg-elevated); }
.theme-preview-pill { display: inline-block; padding: 4px 8px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); }
.surface-note {
    padding: 14px 16px;
    border-radius: 14px;
    background: var(--bg-soft);
    border: 1px dashed var(--border-strong);
    color: var(--text-muted);
}
.success-icon { text-align: center; font-size: 58px; color: var(--success); margin-bottom: 16px; }

@media (max-width: 960px) {
    .app-topbar { height: auto; flex-direction: column; align-items: stretch; }
    .app-topbar-left, .app-topbar-right { flex-wrap: wrap; }
    .app-nav { order: 3; }
    .app-main { padding-top: 20px; }
}

@media (max-width: 640px) {
    .container { width: min(100%, calc(100% - 20px)); }
    .auth-card { padding: 26px 22px; }
    .theme-choice-grid { grid-template-columns: 1fr; }
    .otp-cell { width: 42px; height: 52px; }
    .page-title { font-size: 24px; }
}