@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ── Design Tokens ── */
:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --color-primary: #007AFF;
    --color-primary-dark: #0056CC;
    --color-success: #34C759;
    --color-warning: #FF9500;
    --color-error: #FF3B30;

    --color-active-bg: #d4f4de;
    --color-active-text: #155724;
    --color-maintenance-bg: #fff3cd;
    --color-maintenance-text: #856404;
    --color-offline-bg: #fde8e8;
    --color-offline-text: #721c24;

    --color-bg: #F2F2F7;
    --color-surface: #FFFFFF;
    --color-card: #F8F8FA;
    --color-border: #E5E5EA;
    --color-text: #1C1C1E;
    --color-text-secondary: #6E6E73;
    --color-text-tertiary: #8E8E93;
    --color-header-bg: #1C1C1E;
    --color-header-text: #FFFFFF;
    --color-nav-bg: #FFFFFF;
    --color-input-bg: #FFFFFF;
    --color-overlay: rgba(0,0,0,0.4);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 2px 10px rgba(0,0,0,0.10);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    --color-bg: #000000;
    --color-surface: #1C1C1E;
    --color-card: #2C2C2E;
    --color-border: #3A3A3C;
    --color-text: #FFFFFF;
    --color-text-secondary: #8E8E93;
    --color-text-tertiary: #636366;
    --color-header-bg: #000000;
    --color-header-text: #FFFFFF;
    --color-nav-bg: #1C1C1E;
    --color-input-bg: #2C2C2E;
    --color-overlay: rgba(0,0,0,0.6);

    --color-active-bg: rgba(52,199,89,0.15);
    --color-active-text: #34C759;
    --color-maintenance-bg: rgba(255,149,0,0.15);
    --color-maintenance-text: #FF9500;
    --color-offline-bg: rgba(255,59,48,0.15);
    --color-offline-text: #FF3B30;

    --shadow-sm: 0 1px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 2px 10px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
}

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

body {
    font-family: var(--font);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    transition: background-color 0.2s, color 0.2s;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Header ── */
.header {
    background: var(--color-header-bg);
    color: var(--color-header-text);
    padding: 0.875rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-header-text);
    font-size: 1.25rem;
    font-weight: 600;
    text-decoration: none;
}

.logo-img { height: 32px; width: auto; }

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-user {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    color: rgba(255,255,255,0.7);
}

.btn-icon {
    background: rgba(255,255,255,0.12);
    color: var(--color-header-text);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.4rem 0.7rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition: background 0.2s;
    font-family: var(--font);
}

.btn-icon:hover { background: rgba(255,255,255,0.22); }

.btn-logout {
    background: rgba(255,255,255,0.15);
    color: var(--color-header-text);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
}
.btn-logout:hover { background: rgba(255,255,255,0.25); }

/* ── Nav ── */
.nav {
    background: var(--color-nav-bg);
    border-bottom: 1px solid var(--color-border);
}

.nav-menu {
    display: flex;
    list-style: none;
    overflow-x: auto;
}

.nav-link {
    display: block;
    padding: 0.875rem 1.25rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    text-decoration: none;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    transition: all 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
    background: rgba(0,122,255,0.07);
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

/* ── Main ── */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 120px);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
}

.page-subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-top: 0.25rem;
}

/* ── Cards ── */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: background-color 0.2s;
}

.card-body { padding: 1.25rem; }

.card-clickable {
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card-clickable:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ── Trailer Grid ── */
.trailer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
}

.trailer-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.trailer-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.trailer-name {
    font-weight: 600;
    font-size: 1.0625rem;
    color: var(--color-text);
}

.trailer-serial {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    margin-top: 0.125rem;
}

.trailer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.trailer-meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

/* ── Camera Grid ── */
.camera-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.camera-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.camera-card.cam-offline {
    opacity: 0.6;
    cursor: default;
}

.camera-thumb {
    background: #000;
    border-radius: var(--radius-sm);
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #555;
    font-size: 2rem;
    overflow: hidden;
}

.camera-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--color-text);
}

/* ── Status Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.badge-active { background: var(--color-active-bg); color: var(--color-active-text); }
.badge-maintenance { background: var(--color-maintenance-bg); color: var(--color-maintenance-text); }
.badge-offline { background: var(--color-offline-bg); color: var(--color-offline-text); }
.badge-online { background: var(--color-active-bg); color: var(--color-active-text); }

.badge-motion { background: rgba(255,149,0,0.15); color: #FF9500; }
.badge-intrusion { background: rgba(255,59,48,0.15); color: #FF3B30; }
.badge-system { background: rgba(0,122,255,0.12); color: #007AFF; }
.badge-low { background: rgba(52,199,89,0.12); color: #34C759; }
.badge-medium { background: rgba(255,149,0,0.12); color: #FF9500; }
.badge-high { background: rgba(255,59,48,0.12); color: #FF3B30; }
.badge-critical { background: #FF3B30; color: #fff; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    font-family: var(--font);
    font-size: 0.9375rem;
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn:hover { text-decoration: none; }

.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn-secondary { background: var(--color-card); color: var(--color-text-secondary); border: 1px solid var(--color-border); }
.btn-secondary:hover { background: var(--color-border); color: var(--color-text); }
.btn-danger { background: var(--color-error); color: #fff; }
.btn-danger:hover { background: #CC2F26; color: #fff; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8125rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

.btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Forms ── */
.form-group { margin-bottom: 1rem; }

label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-text);
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-family: var(--font);
    background: var(--color-input-bg);
    color: var(--color-text);
    transition: border-color 0.2s, background-color 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0,122,255,0.12);
}

.form-hint {
    margin-top: 0.3rem;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.form-error {
    margin-top: 0.3rem;
    font-size: 0.8125rem;
    color: var(--color-error);
}

/* ── Alerts ── */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    display: none;
}

.alert.show { display: block; }
.alert-error { background: rgba(255,59,48,0.12); border: 1px solid rgba(255,59,48,0.3); color: #c0392b; }
.alert-success { background: rgba(52,199,89,0.12); border: 1px solid rgba(52,199,89,0.3); color: #1a7a36; }

[data-theme="dark"] .alert-error { color: #FF6B60; }
[data-theme="dark"] .alert-success { color: #4CD964; }

/* ── Loading ── */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    z-index: 999;
    align-items: center;
    justify-content: center;
}

.loading-overlay.show {
    display: flex;
}

.loading-box {
    background: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--color-text);
}

/* ── Events table ── */
.data-table {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

table { width: 100%; border-collapse: collapse; }

thead { background: var(--color-card); }

th, td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

th {
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

tr:last-child td { border-bottom: none; }
tr:hover { background: rgba(0,122,255,0.04); }

/* ── PTZ Controls ── */
.ptz-pad {
    display: grid;
    grid-template-columns: repeat(3, 44px);
    grid-template-rows: repeat(3, 44px);
    gap: 4px;
}

.ptz-btn {
    width: 44px;
    height: 44px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--color-text);
    transition: background 0.15s;
    font-family: var(--font);
}

.ptz-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.ptz-btn:active { transform: scale(0.94); }
.ptz-btn.center { background: var(--color-border); cursor: default; }
.ptz-btn.center:hover { background: var(--color-border); color: var(--color-text); border-color: var(--color-border); }

.ptz-zoom {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
}

/* ── Video player ── */
.video-wrapper {
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16/9;
    position: relative;
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.video-status {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

.video-status.hidden { display: none; }

/* ── Empty state ── */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--color-text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

/* ── Filters bar ── */
.filters {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.filters select, .filters input {
    width: auto;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.breadcrumb a { color: var(--color-primary); }
.breadcrumb-sep { opacity: 0.4; }

/* ── Profile ── */
.profile-section {
    max-width: 560px;
}

.profile-section + .profile-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

/* ── Toast ── */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-lg);
    font-size: 0.9375rem;
    color: var(--color-text);
    z-index: 9999;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.25s, opacity 0.25s;
    max-width: 340px;
}

.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { border-left: 4px solid var(--color-success); }
.toast-error { border-left: 4px solid var(--color-error); }

/* ── Responsive ── */
@media (max-width: 768px) {
    .header-content { flex-wrap: wrap; }
    .trailer-grid, .camera-grid { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: stretch; }
    .filters { flex-direction: column; }
    .filters select, .filters input { width: 100%; }
    table { font-size: 0.875rem; }
    th, td { padding: 0.625rem 0.75rem; }
}