/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #f4f6f9;
    --bg-secondary: #ffffff;
    --bg-sidebar: #1a2332;
    --bg-sidebar-hover: #2a3a52;
    --bg-navbar: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-sidebar: #cbd5e1;
    --text-sidebar-active: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.10);
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #dbeafe;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #f59e0b;
    --radius: 12px;
    --radius-sm: 6px;
    --transition: 0.25s ease;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --navbar-height: 64px;
    --footer-height: 56px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-sidebar: #0b1120;
    --bg-sidebar-hover: #1e2a45;
    --bg-navbar: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-sidebar: #94a3b8;
    --text-sidebar-active: #ffffff;
    --border-color: #334155;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
    --accent-light: #1e293b;
}

html,
body {
    height: 100%;
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition), color var(--transition);
}

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

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
    color: inherit;
}

input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    transition: border var(--transition), box-shadow var(--transition);
    width: 100%;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

input[type="checkbox"] {
    width: auto;
    accent-color: var(--accent);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ===== UTILITY ===== */
.hidden {
    display: none !important;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gap-2 {
    gap: 8px;
}
.gap-3 {
    gap: 12px;
}
.gap-4 {
    gap: 16px;
}
.gap-6 {
    gap: 24px;
}

.mt-2 {
    margin-top: 8px;
}
.mt-3 {
    margin-top: 12px;
}
.mt-4 {
    margin-top: 16px;
}
.mt-6 {
    margin-top: 24px;
}
.mb-2 {
    margin-bottom: 8px;
}
.mb-3 {
    margin-bottom: 12px;
}
.mb-4 {
    margin-bottom: 16px;
}

.text-sm {
    font-size: 0.875rem;
}
.text-xs {
    font-size: 0.75rem;
}
.text-muted {
    color: var(--text-muted);
}
.text-center {
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.badge-pending {
    background: #fef3c7;
    color: #92400e;
}
.badge-paid {
    background: #d1fae5;
    color: #065f46;
}
.badge-canceled {
    background: #fee2e2;
    color: #991b1b;
}
[data-theme="dark"] .badge-pending {
    background: #451a03;
    color: #fbbf24;
}
[data-theme="dark"] .badge-paid {
    background: #064e3b;
    color: #34d399;
}
[data-theme="dark"] .badge-canceled {
    background: #7f1d1d;
    color: #fca5a5;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: background var(--transition), transform 0.15s, box-shadow var(--transition);
    border: 1px solid transparent;
}
.btn:active {
    transform: scale(0.96);
}
.btn-primary {
    background: var(--accent);
    color: #fff;
}
.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}
.btn-secondary {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}
.btn-secondary:hover {
    background: var(--border-color);
}
.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover {
    background: #b91c1c;
}
.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-success:hover {
    background: #15803d;
}
.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}
.btn-outline:hover {
    background: var(--bg-primary);
}
.btn-sm {
    padding: 4px 12px;
    font-size: 0.8rem;
}
.btn-block {
    width: 100%;
    justify-content: center;
}
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    background: var(--bg-primary);
}

/* ===== LAYOUT ===== */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ---- Navbar ---- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--navbar-height);
    background: var(--bg-navbar);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 16px;
    box-shadow: var(--shadow);
    transition: background var(--transition), border var(--transition);
}

.navbar .hamburger {
    font-size: 1.3rem;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition);
}
.navbar .hamburger:hover {
    background: var(--bg-primary);
}

.navbar .nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    flex-shrink: 0;
}
.navbar .nav-logo img {
    height: 36px;
    width: auto;
}

.navbar .nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 16px;
    flex: 1;
}
.navbar .nav-links a {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
    position: relative;
}
.navbar .nav-links a:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}
.navbar .nav-links a.active {
    color: var(--accent);
    background: var(--accent-light);
}

.navbar .nav-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    flex-shrink: 0;
}
.navbar .nav-actions .icon-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
    position: relative;
}
.navbar .nav-actions .icon-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}
.navbar .nav-actions .icon-btn .badge-dot {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-navbar);
}

.navbar .user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-left: 12px;
    border-left: 1px solid var(--border-color);
}
.navbar .user-info .avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
}
.navbar .user-info .user-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.2;
}
.navbar .user-info .user-text small {
    display: block;
    font-weight: 400;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ---- Sidebar ---- */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 199;
    background: rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}
.sidebar-overlay.open {
    opacity: 1;
    visibility: visible;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 200;
    width: 280px;
    background: var(--bg-sidebar);
    padding: 16px 0;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.2);
}
.sidebar.open {
    transform: translateX(0);
}

.sidebar .sidebar-header {
    padding: 8px 20px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.sidebar .sidebar-header img {
    height: 32px;
    width: auto;
}
.sidebar .sidebar-header .close-sidebar {
    color: var(--text-muted);
    font-size: 1.2rem;
    padding: 4px;
}
.sidebar .sidebar-header .close-sidebar:hover {
    color: #fff;
}

.sidebar .sidebar-menu {
    padding: 12px 12px;
    flex: 1;
}
.sidebar .sidebar-menu .menu-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: 8px 12px 4px;
    font-weight: 600;
}
.sidebar .sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-sidebar);
    transition: background var(--transition), color var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 2px;
}
.sidebar .sidebar-menu a i {
    width: 20px;
    font-size: 1rem;
    text-align: center;
    flex-shrink: 0;
}
.sidebar .sidebar-menu a:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-sidebar-active);
}
.sidebar .sidebar-menu a.active {
    background: var(--accent);
    color: #fff;
}
.sidebar .sidebar-menu a .tooltip {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-left: auto;
    opacity: 0;
    transition: opacity var(--transition);
}
.sidebar .sidebar-menu a:hover .tooltip {
    opacity: 1;
}

.sidebar .sidebar-footer {
    padding: 12px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

/* ---- Main Content ---- */
.main-content {
    flex: 1;
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    transition: padding var(--transition);
}

/* ---- Footer ---- */
.footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    padding: 12px 20px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: background var(--transition), border var(--transition);
}
.footer .social a {
    color: var(--text-muted);
    margin-left: 12px;
    transition: color var(--transition);
    font-size: 1.1rem;
}
.footer .social a:hover {
    color: var(--accent);
}

/* ===== PAGES ===== */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}
.page.active {
    display: block;
}

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

.page-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    text-align: center;
    gap: 16px;
}
.page-placeholder img {
    max-width: 240px;
    width: 100%;
    opacity: 0.5;
}
.page-placeholder h2 {
    color: var(--text-muted);
    font-weight: 400;
}

/* ---- Card / Panel ---- */
.panel {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    padding: 20px 24px;
    transition: background var(--transition), border var(--transition), box-shadow var(--transition);
    margin-bottom: 20px;
}
.panel-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.panel-title i {
    color: var(--accent);
}

/* ---- Filters ---- */
.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px 18px;
}
.filters-grid .filter-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.filters-grid .filter-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.filters-grid .filter-group .inline-group {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}
.filters-grid .filter-group .inline-group input,
.filters-grid .filter-group .inline-group select {
    flex: 1;
    min-width: 60px;
}
.filters-grid .filter-group .inline-group .inline-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.filters-grid .filter-group .checkbox-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    padding-top: 4px;
}
.filters-grid .filter-group .checkbox-group label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.filter-actions {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
}

/* ---- Table ---- */
.table-responsive {
    overflow-x: auto;
    margin-top: 4px;
}
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}
table thead {
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border-color);
}
table th {
    text-align: left;
    padding: 10px 12px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
}
table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}
table tbody tr:hover {
    background: var(--bg-primary);
}
table .empty-row td {
    text-align: center;
    padding: 30px 12px;
    color: var(--text-muted);
    font-style: italic;
}

.table-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.table-status .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}
.dot-pending {
    background: var(--warning);
}
.dot-paid {
    background: var(--success);
}
.dot-canceled {
    background: var(--danger);
}

/* ---- PDF Preview ---- */
.pdf-preview {
    width: 100%;
    min-height: 400px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    flex-direction: column;
    gap: 12px;
    padding: 20px;
}
.pdf-preview iframe {
    width: 100%;
    min-height: 500px;
    border: none;
    border-radius: var(--radius-sm);
}
.pdf-preview .pdf-placeholder {
    font-size: 0.95rem;
}
.pdf-preview .pdf-placeholder i {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
}

/* ===== MODALS ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 500;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    padding: 20px;
}
.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}
.modal-overlay .modal {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 28px 32px;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95) translateY(10px);
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    border: 1px solid var(--border-color);
}
.modal-overlay.open .modal {
    transform: scale(1) translateY(0);
}
.modal .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}
.modal .modal-header .modal-logo {
    height: 32px;
    width: auto;
}
.modal .modal-header .close-modal {
    font-size: 1.4rem;
    color: var(--text-muted);
    padding: 4px;
    transition: color var(--transition);
}
.modal .modal-header .close-modal:hover {
    color: var(--text-primary);
}
.modal .modal-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ---- Login Modal ---- */
.login-providers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}
.login-providers .btn {
    font-size: 0.8rem;
    padding: 6px 10px;
    justify-content: center;
    border-color: var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
}
.login-providers .btn:hover {
    background: var(--border-color);
}
.login-providers .btn i {
    font-size: 1rem;
}
.login-providers .btn.google i {
    color: #ea4335;
}
.login-providers .btn.yahoo i {
    color: #6001d2;
}
.login-providers .btn.github i {
    color: #24292e;
}
.login-providers .btn.gitlab i {
    color: #fc6d26;
}
[data-theme="dark"] .login-providers .btn.github i {
    color: #f0f6fc;
}

.login-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.8rem;
}
.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.login-error {
    background: #fee2e2;
    color: #991b1b;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    display: none;
}
[data-theme="dark"] .login-error {
    background: #7f1d1d;
    color: #fca5a5;
}
.login-error.show {
    display: block;
}

/* ---- Error Modal ---- */
.error-modal .error-textarea {
    width: 100%;
    min-height: 120px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    padding: 10px 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}
.error-modal .error-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .navbar .nav-links {
        display: none;
    }
    .navbar .user-info .user-text {
        display: none;
    }
    .navbar {
        padding: 0 12px;
    }
    .main-content {
        padding: 12px;
    }
    .filters-grid {
        grid-template-columns: 1fr;
    }
    .login-providers {
        grid-template-columns: 1fr 1fr;
    }
    .modal-overlay .modal {
        padding: 20px;
        margin: 10px;
    }
    .sidebar {
        width: 260px;
    }
    .footer {
        flex-direction: column;
        text-align: center;
        padding: 12px;
    }
    .footer .social a {
        margin: 0 6px;
    }
    .panel {
        padding: 14px 16px;
    }
    table {
        font-size: 0.8rem;
    }
    table th,
    table td {
        padding: 6px 8px;
    }
}

@media (max-width: 480px) {
    .login-providers {
        grid-template-columns: 1fr;
    }
    .navbar .nav-actions .icon-btn {
        width: 32px;
        height: 32px;
        font-size: 0.95rem;
    }
    .navbar .hamburger {
        font-size: 1.1rem;
        padding: 4px 6px;
    }
}

/* loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}
.btn .spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

/* tooltip helper */
.has-tooltip {
    position: relative;
}
.has-tooltip .tooltip-text {
    display: none;
}