/* ============================================================
   EAST DIGITAL INVOICE SYSTEM - Design System
   Premium dark theme with glassmorphism
   ============================================================ */

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

/* ── CSS Custom Properties ── */
:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1e293b;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(30, 41, 59, 0.8);
    --bg-input: rgba(15, 23, 42, 0.8);

    --border-color: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.14);
    --border-focus: rgba(99, 102, 241, 0.5);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0f172a;

    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 24px var(--accent-glow);

    --sidebar-width: 260px;
    --header-height: 64px;

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; 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;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; height: auto; }
input, select, textarea, button { font-family: inherit; font-size: inherit; }

.hidden { display: none !important; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ── App Layout ── */
#app-shell {
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ── */
#sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: linear-gradient(180deg, rgba(17, 24, 39, 0.95) 0%, rgba(11, 15, 25, 0.98) 100%);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    transition: transform var(--transition-slow);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-header img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.sidebar-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#sidebar nav {
    flex: 1;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 1px solid transparent;
}

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

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent-hover);
    border-color: rgba(99, 102, 241, 0.2);
}

.nav-item svg { width: 20px; height: 20px; flex-shrink: 0; }

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

/* ── Main Content ── */
#main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem 2.5rem;
    min-height: 100vh;
}

.content-view { animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Page Header ── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.page-header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* ── Cards ── */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-base);
    white-space: nowrap;
    line-height: 1.4;
}

.btn svg { width: 16px; height: 16px; }

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    border: none;
    box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.2);
}
.btn-danger:hover { background: rgba(239, 68, 68, 0.2); }

.btn-success {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.2);
}

.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.8rem; }
.btn-lg { padding: 0.8rem 1.75rem; font-size: 1rem; }
.btn-icon { padding: 0.5rem; border-radius: var(--radius-sm); }

/* ── Tables ── */
.data-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    backdrop-filter: blur(12px);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table thead th {
    padding: 0.85rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.2);
    white-space: nowrap;
}

.data-table tbody tr {
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover { background: rgba(255, 255, 255, 0.03); }
.data-table tbody tr:last-child { border-bottom: none; }

.data-table td {
    padding: 0.8rem 1rem;
    vertical-align: middle;
    color: var(--text-secondary);
}

.data-table td:first-child { color: var(--text-primary); font-weight: 500; }

.table-actions {
    display: flex;
    gap: 0.4rem;
}

/* ── Forms ── */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-control {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.92rem;
    transition: all var(--transition-base);
    outline: none;
}

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

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

textarea.form-control { min-height: 80px; resize: vertical; }

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* ── Status Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-draft { background: rgba(100, 116, 139, 0.15); color: #94a3b8; }
.badge-sent { background: var(--info-bg); color: var(--info); }
.badge-paid { background: var(--success-bg); color: var(--success); }
.badge-partial { background: var(--warning-bg); color: var(--warning); }
.badge-overdue { background: var(--danger-bg); color: var(--danger); }
.badge-cancelled { background: rgba(100, 116, 139, 0.1); color: var(--text-muted); }
.badge-domestic { background: var(--info-bg); color: var(--info); }
.badge-export { background: rgba(139, 92, 246, 0.12); color: #a78bfa; }

/* ── Modal ── */
#modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
}

#modal-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 { font-size: 1.15rem; font-weight: 700; }

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.3rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: 1.2rem;
}
.modal-close:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }

.modal-body { padding: 1.5rem; }

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ── Toast Notifications ── */
#toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    min-width: 280px;
    max-width: 420px;
    font-size: 0.9rem;
}

.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }
.toast-info { border-left: 3px solid var(--info); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100%); }
}

/* ── Searchable Dropdown ── */
.search-dropdown {
    position: relative;
}

.search-dropdown-input {
    width: 100%;
    padding: 0.65rem 0.9rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.92rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-base);
}

.search-dropdown-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-dropdown-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 240px;
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-top: 4px;
    z-index: 500;
    box-shadow: var(--shadow-lg);
}

.search-dropdown-item {
    padding: 0.55rem 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background var(--transition-fast);
    font-size: 0.88rem;
}

.search-dropdown-item:hover,
.search-dropdown-item.highlighted {
    background: rgba(99, 102, 241, 0.12);
}

.search-dropdown-item .flag { font-size: 1.1rem; }

/* ── Empty State ── */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-muted);
}

.empty-state svg { width: 48px; height: 48px; margin-bottom: 1rem; opacity: 0.4; }
.empty-state h3 { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.empty-state p { font-size: 0.9rem; margin-bottom: 1.5rem; }

/* ── Search Input ── */
.search-bar {
    position: relative;
    max-width: 320px;
}

.search-bar input {
    width: 100%;
    padding: 0.6rem 0.9rem 0.6rem 2.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
    transition: all var(--transition-base);
}

.search-bar input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-bar svg {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

/* ── Confirm Dialog ── */
.confirm-dialog {
    text-align: center;
    padding: 1rem 0;
}

.confirm-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--danger-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    color: var(--danger);
    animation: confirmPulse 2s ease-in-out infinite;
}

@keyframes confirmPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.15); }
    50% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
}

.confirm-dialog p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
    line-height: 1.5;
}

.confirm-input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.confirm-input-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-align: center;
}

.confirm-input-group label strong {
    color: var(--danger);
    font-weight: 700;
}

.confirm-input-group input {
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.confirm-dialog .btn-group {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

.confirm-dialog .btn-danger:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.confirm-dialog .btn-danger-active {
    opacity: 1;
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
    box-shadow: 0 2px 12px rgba(239, 68, 68, 0.3);
    animation: confirmReady 0.3s ease;
}

@keyframes confirmReady {
    0% { transform: scale(0.95); }
    60% { transform: scale(1.03); }
    100% { transform: scale(1); }
}

/* ── Loading Spinner ── */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ── Responsive ── */
@media (max-width: 768px) {
    #sidebar {
        transform: translateX(-100%);
    }
    #sidebar.open { transform: translateX(0); }

    #main-content {
        margin-left: 0;
        padding: 1rem;
    }

    .page-header { flex-direction: column; align-items: flex-start; }
    .form-row { grid-template-columns: 1fr; }

    #modal-container { max-width: 100%; }

    .mobile-menu-btn {
        display: flex !important;
    }
}

.mobile-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 101;
}

/* ── Utility ── */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-mono { font-family: 'SF Mono', 'Fira Code', monospace; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ── Settings Page ── */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.settings-section {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.settings-section:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.settings-section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.settings-section-header svg {
    color: var(--accent);
    flex-shrink: 0;
}

.settings-section-header h2 {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.settings-section-body {
    padding: 1.5rem;
}

@media (min-width: 769px) {
    .settings-grid {
        grid-template-columns: 1fr 1fr;
    }
    .settings-grid .settings-section:first-child {
        grid-column: 1 / -1;
    }
}