/* ═══════════════════════════════════════════════════════════════════
   NK Analytics – Premium Dark Theme
   ═══════════════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(30, 41, 59, 0.9);
    --bg-glass: rgba(255,255,255,0.04);
    --bg-input: rgba(255,255,255,0.06);
    --border: rgba(255,255,255,0.08);
    --border-focus: rgba(56, 189, 248, 0.5);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #38bdf8;
    --accent-hover: #7dd3fc;
    --accent-glow: rgba(56, 189, 248, 0.15);
    --gradient-1: linear-gradient(135deg, #0ea5e9, #6366f1);
    --gradient-2: linear-gradient(135deg, #8b5cf6, #ec4899);
    --gradient-3: linear-gradient(135deg, #10b981, #06b6d4);
    --gradient-4: linear-gradient(135deg, #f59e0b, #ef4444);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px rgba(56,189,248,0.1);
    --sidebar-w: 260px;
    --header-h: 64px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { font-size: 14px; scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(56,189,248,0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139,92,246,0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

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

/* ─── LOGIN PAGE ─────────────────────────────────────────────────── */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(56,189,248,0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 70%, rgba(139,92,246,0.06) 0%, transparent 60%),
        var(--bg-primary);
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--bg-card);
    backdrop-filter: blur(40px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: fadeUp 0.6s ease-out;
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo .icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-1);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 16px;
    box-shadow: 0 8px 30px rgba(14,165,233,0.3);
}

.login-logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-logo p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: rgba(255,255,255,0.08);
}

.form-control::placeholder { color: var(--text-muted); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 15px rgba(14,165,233,0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 25px rgba(14,165,233,0.4);
}

.btn-full { width: 100%; }

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.15);
}

.btn-sm { padding: 8px 16px; font-size: 0.8rem; }

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.85rem;
    border: 1px solid;
    animation: fadeIn 0.3s;
}

.alert-error {
    background: rgba(239,68,68,0.1);
    border-color: rgba(239,68,68,0.3);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16,185,129,0.1);
    border-color: rgba(16,185,129,0.3);
    color: #6ee7b7;
}

.alert-info {
    background: rgba(59,130,246,0.1);
    border-color: rgba(59,130,246,0.3);
    color: #93c5fd;
}

/* ─── LAYOUT ─────────────────────────────────────────────────────── */
.app-layout {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: var(--transition);
    overflow-y: auto;
}

.sidebar-brand {
    padding: 20px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.sidebar-brand h2 {
    font-size: 1rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-brand small {
    display: block;
    font-size: 0.7rem;
    -webkit-text-fill-color: var(--text-muted);
    font-weight: 400;
}

.sidebar-nav {
    padding: 12px 8px;
    flex: 1;
}

.nav-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 16px 14px 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    margin-bottom: 2px;
}

.nav-item:hover {
    background: var(--bg-glass);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent);
}

.nav-item .nav-icon {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 10px;
    background: var(--bg-glass);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--gradient-2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: white;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-details .name { font-size: 0.8rem; font-weight: 600; }
.user-details .role { font-size: 0.7rem; color: var(--text-muted); }

/* ─── MAIN CONTENT ───────────────────────────────────────────────── */
.main-content {
    margin-left: var(--sidebar-w);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: var(--header-h);
    background: rgba(17,24,39,0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-title {
    font-size: 1.1rem;
    font-weight: 600;
}

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

.content { padding: 24px; flex: 1; }

/* ─── CARDS ──────────────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover { border-color: rgba(255,255,255,0.12); }

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.card-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
}

.card-body { padding: 20px; }
.card-body.no-pad { padding: 0; }

/* ─── STAT CARDS ─────────────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stat-card:nth-child(1)::before { background: var(--gradient-1); }
.stat-card:nth-child(2)::before { background: var(--gradient-2); }
.stat-card:nth-child(3)::before { background: var(--gradient-3); }
.stat-card:nth-child(4)::before { background: var(--gradient-4); }
.stat-card:nth-child(5)::before { background: linear-gradient(135deg, #6366f1, #a855f7); }
.stat-card:nth-child(6)::before { background: linear-gradient(135deg, #f97316, #eab308); }

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255,255,255,0.12);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ─── PERIOD SELECTOR ────────────────────────────────────────────── */
.period-selector {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 16px;
}

.period-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.period-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.period-group select,
.period-group input[type="number"] {
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
    min-width: 100px;
}

.period-group select:focus,
.period-group input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.period-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 12px;
    width: 100%;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.period-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 500;
}

.period-badge.current { background: rgba(56,189,248,0.12); color: var(--accent); }
.period-badge.ss1 { background: rgba(168,85,247,0.12); color: #c084fc; }
.period-badge.ss2 { background: rgba(251,146,60,0.12); color: #fb923c; }

/* ─── TABLES ─────────────────────────────────────────────────────── */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}

.data-table thead th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 5;
}

.data-table tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    vertical-align: middle;
}

.data-table tbody tr { transition: var(--transition); }
.data-table tbody tr:hover { background: var(--bg-glass); }

.data-table .text-right { text-align: right; }
.data-table .text-center { text-align: center; }
.data-table .text-nowrap { white-space: nowrap; }

.data-table .money { font-variant-numeric: tabular-nums; font-weight: 500; }

.data-table tfoot td {
    padding: 10px 14px;
    font-weight: 700;
    border-top: 2px solid var(--border);
    background: rgba(56,189,248,0.04);
}

/* Delta colors */
.delta-up { color: var(--success); }
.delta-down { color: var(--danger); }
.delta-zero { color: var(--text-muted); }

/* ─── REPORT SECTION ─────────────────────────────────────────────── */
.report-section {
    margin-bottom: 24px;
    animation: fadeUp 0.4s ease-out both;
}

.report-section:nth-child(2) { animation-delay: 0.05s; }
.report-section:nth-child(3) { animation-delay: 0.1s; }
.report-section:nth-child(4) { animation-delay: 0.15s; }

.report-title {
    font-size: 0.9rem;
    font-weight: 700;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(56,189,248,0.05) 0%, transparent 100%);
}

.report-title .num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: var(--gradient-1);
    border-radius: 7px;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
}

/* ─── IMPORT PAGE ────────────────────────────────────────────────── */
.import-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.import-zone:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.import-zone .icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.progress-bar {
    height: 8px;
    background: rgba(255,255,255,0.08);
    border-radius: 99px;
    overflow: hidden;
    margin: 12px 0;
}

.progress-bar .fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 99px;
    transition: width 0.3s ease;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px 0;
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
}

/* ─── TABS ───────────────────────────────────────────────────────── */
.tabs {
    display: flex;
    gap: 2px;
    margin-bottom: 20px;
    background: var(--bg-glass);
    border-radius: var(--radius);
    padding: 3px;
    overflow-x: auto;
}

.tab {
    padding: 8px 18px;
    border-radius: 9px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    border: none;
    background: transparent;
    font-family: inherit;
}

.tab:hover { color: var(--text-primary); background: rgba(255,255,255,0.04); }

.tab.active {
    background: var(--accent-glow);
    color: var(--accent);
    font-weight: 600;
}

/* ─── ANIMATIONS ─────────────────────────────────────────────────── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.loading { animation: pulse 1.5s infinite; }

/* ─── RESPONSIVE ─────────────────────────────────────────────────── */
.menu-toggle {
    display: none;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open { transform: translateX(0); }

    .main-content { margin-left: 0; }

    .menu-toggle { display: block; }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 99;
    }

    .sidebar-overlay.show { display: block; }
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .period-selector {
        flex-direction: column;
        align-items: stretch;
    }

    .content { padding: 16px; }

    .stat-value { font-size: 1.2rem; }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .login-card {
        padding: 32px 24px;
    }
}

/* ─── UTILITY ────────────────────────────────────────────────────── */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.text-sm { font-size: 0.85rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-accent { color: var(--accent); }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.hidden { display: none !important; }