/* ═══════════════════════════════════════════════════════════════
   Sainath Enterprises — Global Responsive Stylesheet
   Mobile-first: app-like on phones, desktop dashboard on larger screens
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #dbeafe;
    --surface: #ffffff;
    --surface-alt: #f8fafc;
    --bg: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --nav-height: 0px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Base ───────────────────────────────────────────────────── */
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ── Mobile Bottom Navigation ──────────────────────────────── */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-top: 1px solid rgba(0,0,0,0.06);
    z-index: 1000;
    padding: 6px 0 calc(6px + var(--safe-bottom));
    box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
}
.mobile-bottom-nav .nav-items {
    display: flex;
    justify-content: space-around;
    align-items: center;
    max-width: 500px;
    margin: 0 auto;
}
.mobile-bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
    transition: var(--transition);
    position: relative;
}
.mobile-bottom-nav .nav-item i {
    font-size: 18px;
    transition: var(--transition);
}
.mobile-bottom-nav .nav-item.active {
    color: var(--primary);
}
.mobile-bottom-nav .nav-item.active i {
    transform: scale(1.1);
}
.mobile-bottom-nav .nav-item.active::before {
    content: '';
    position: absolute;
    top: -6px;
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 0 0 3px 3px;
}

/* ── Mobile Top Header Bar ─────────────────────────────────── */
.mobile-header {
    display: none;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 12px 16px;
    align-items: center;
    justify-content: space-between;
}
.mobile-header .header-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}
.mobile-header .header-subtitle {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 1px;
}
.mobile-header .header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}
.mobile-header .header-action-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-alt);
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-size: 14px;
}
.mobile-header .header-action-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* ── Mobile Card Style (for tables) ────────────────────────── */
.mobile-card-list {
    display: none;
}
.mobile-data-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.mobile-data-card:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-md);
}
.mobile-data-card .card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}
.mobile-data-card .card-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}
.mobile-data-card .card-subtitle {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}
.mobile-data-card .card-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.mobile-data-card .metric {
    background: var(--surface-alt);
    border-radius: var(--radius-xs);
    padding: 8px 10px;
}
.mobile-data-card .metric-label {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    margin-bottom: 2px;
}
.mobile-data-card .metric-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* ── Floating Action Button ────────────────────────────────── */
.fab-button {
    display: none;
    position: fixed;
    right: 20px;
    bottom: calc(72px + var(--safe-bottom));
    width: 54px;
    height: 54px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    box-shadow: 0 4px 16px rgba(59,130,246,0.35);
    cursor: pointer;
    z-index: 999;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: var(--transition);
    text-decoration: none;
}
.fab-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(59,130,246,0.45);
}

/* ── Mobile Action Sheet ───────────────────────────────────── */
.mobile-action-sheet {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
}
.mobile-action-sheet.open {
    display: flex;
}
.mobile-action-sheet .sheet-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(4px);
}
.mobile-action-sheet .sheet-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-radius: 20px 20px 0 0;
    padding: 8px 16px calc(16px + var(--safe-bottom));
    animation: slideUp 0.3s cubic-bezier(0.32, 0.72, 0, 1);
    max-height: 80vh;
    overflow-y: auto;
}
.mobile-action-sheet .sheet-handle {
    width: 36px;
    height: 4px;
    background: #d1d5db;
    border-radius: 4px;
    margin: 0 auto 12px;
}
.mobile-action-sheet .sheet-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--border-light);
    text-decoration: none;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}
.mobile-action-sheet .sheet-item:last-child {
    border-bottom: none;
}
.mobile-action-sheet .sheet-item i {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    font-size: 14px;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

/* ── Mobile Stats Row ──────────────────────────────────────── */
.mobile-stats-row {
    display: none;
}

/* ── Mobile Filter Scrollable ──────────────────────────────── */
.mobile-filter-scroll {
    display: none;
}

/* ── Pill Badge ────────────────────────────────────────────── */
.pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 10px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 20px;
}
.pill-badge.credit { background: #fef2f2; color: #dc2626; }
.pill-badge.debit  { background: #ecfdf5; color: #059669; }
.pill-badge.paid   { background: #ecfdf5; color: #059669; }
.pill-badge.pending { background: #fffbeb; color: #d97706; }
.pill-badge.matched { background: #ecfdf5; color: #059669; }
.pill-badge.unmatched { background: #fef2f2; color: #dc2626; }

/* ── Mobile Month Picker ───────────────────────────────────── */
.mobile-month-picker {
    display: none;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE BREAKPOINT: MOBILE (max-width: 768px)
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }

    body {
        padding-bottom: calc(var(--nav-height) + var(--safe-bottom) + 10px);
        background: var(--bg);
    }

    /* Show mobile-specific elements */
    .mobile-bottom-nav,
    .mobile-header,
    .mobile-card-list,
    .mobile-stats-row,
    .mobile-filter-scroll,
    .mobile-month-picker {
        display: flex;
    }
    .mobile-card-list {
        display: block;
    }

    /* Hide desktop elements */
    .desktop-only {
        display: none !important;
    }

    /* Compact main container */
    .main-container {
        max-width: 100% !important;
        padding: 0 12px !important;
        margin: 0 !important;
    }

    /* Desktop header row — hide on mobile */
    .desktop-header {
        display: none !important;
    }

    /* Desktop table — hide on mobile (we show cards instead) */
    .desktop-table {
        display: none !important;
    }

    /* Desktop nav bar */
    .desktop-nav {
        display: none !important;
    }

    /* Adjust invoice card grid for mobile */
    .invoice-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
        padding: 0 !important;
    }

    /* Invoice card mobile optimization */
    .invoice-card {
        border-radius: var(--radius) !important;
        border: 1px solid var(--border) !important;
        box-shadow: var(--shadow-sm) !important;
    }

    /* Stats grid mobile */
    .stats-grid-mobile {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        margin-bottom: 14px;
    }
    .stats-grid-mobile .stat-card {
        background: var(--surface);
        border-radius: var(--radius-sm);
        padding: 12px 8px;
        text-align: center;
        border: 1px solid var(--border);
        box-shadow: var(--shadow-sm);
    }
    .stats-grid-mobile .stat-value {
        font-size: 20px;
        font-weight: 800;
        line-height: 1.2;
    }
    .stats-grid-mobile .stat-label {
        font-size: 9px;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        color: var(--text-muted);
        margin-top: 4px;
    }

    /* Filter pills horizontal scroll */
    .filter-scroll {
        display: flex !important;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 6px;
        padding: 2px 0 10px;
        scrollbar-width: none;
        margin-bottom: 6px;
    }
    .filter-scroll::-webkit-scrollbar { display: none; }
    .filter-scroll .filter-pill {
        flex-shrink: 0;
        white-space: nowrap;
        padding: 7px 14px;
        border-radius: 20px;
        font-size: 12px;
        font-weight: 600;
        border: 1px solid var(--border);
        background: var(--surface);
        color: var(--text-secondary);
        text-decoration: none;
        transition: var(--transition);
    }
    .filter-scroll .filter-pill.active {
        background: var(--primary);
        border-color: var(--primary);
        color: white;
    }

    /* Modal full screen on mobile */
    .modal-container {
        align-items: flex-end !important;
        padding: 0 !important;
    }
    .modal-content {
        border-radius: 20px 20px 0 0 !important;
        max-width: 100% !important;
        width: 100% !important;
        margin: 0 !important;
        max-height: 90vh;
        overflow-y: auto;
    }

    /* GSTR-1 summary metrics */
    .summary-hero {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 10px !important;
        padding: 16px !important;
        border-radius: var(--radius) !important;
    }
    .summary-hero .metric-value-big {
        font-size: 16px !important;
    }

    /* Summary detail cards */
    .summary-detail-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }

    /* Upload section mobile */
    .upload-section {
        padding: 24px 16px !important;
        border-radius: var(--radius) !important;
    }

    /* Settings form mobile */
    .settings-form-grid {
        grid-template-columns: 1fr !important;
    }

    /* Hide the fab on desktop */
    .fab-button {
        display: flex;
    }

    /* Month picker inline */
    .month-picker-inline {
        width: 100%;
        padding: 10px 12px;
        background: var(--surface);
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
        margin-bottom: 12px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .month-picker-inline input[type="month"] {
        flex: 1;
        border: none;
        outline: none;
        font-size: 14px;
        font-weight: 600;
        color: var(--text-primary);
        background: transparent;
    }
    .month-picker-inline i {
        color: var(--text-muted);
    }

    /* Overrides for print pages (hide nav) */
    @media print {
        .mobile-bottom-nav,
        .mobile-header,
        .fab-button {
            display: none !important;
        }
        body {
            padding-bottom: 0;
        }
    }
}

/* ═══════════════════════════════════════════════════════════════
   DESKTOP-ONLY STYLES (min-width: 769px)
   ═══════════════════════════════════════════════════════════════ */
@media (min-width: 769px) {
    .mobile-only {
        display: none !important;
    }
}

/* ── Shared Utility Classes ────────────────────────────────── */
.truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.animate-in {
    animation: fadeSlideIn 0.3s ease forwards;
}
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Pull-to-refresh indicator styling */
.pull-indicator {
    text-align: center;
    padding: 12px;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 600;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}
.empty-state i {
    font-size: 40px;
    margin-bottom: 12px;
    opacity: 0.5;
}
.empty-state p {
    font-size: 14px;
    font-weight: 500;
}