/* ═══════════════════════════════════════════════════════════
   Reportal — Design System
   Dark/Light mode with CSS custom properties
   ═══════════════════════════════════════════════════════════ */

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

/* ── Dark Theme (default) ────────────────────────────────── */
:root {
    --bg-primary: #060a13;
    --bg-secondary: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.85);
    --bg-card-hover: rgba(30, 41, 59, 0.9);
    --bg-input: rgba(15, 23, 42, 0.6);
    --bg-input-focus: rgba(15, 23, 42, 0.8);
    --border-default: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(99, 102, 241, 0.5);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --shadow-card: 0 0 60px rgba(99, 102, 241, 0.06), 0 25px 50px rgba(0, 0, 0, 0.3);
    --shadow-elevated: 0 20px 40px rgba(0, 0, 0, 0.4);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --sidebar-width: 260px;
}

/* ── Light Theme ─────────────────────────────────────────── */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.95);
    --bg-card-hover: rgba(241, 245, 249, 0.95);
    --bg-input: rgba(241, 245, 249, 0.8);
    --bg-input-focus: #ffffff;
    --border-default: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);
    --border-accent: rgba(99, 102, 241, 0.5);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-elevated: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Background Gradient ─────────────────────────────────── */
.bg-gradient {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(99, 102, 241, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 50% 80% at 50% 0%, rgba(59, 130, 246, 0.04) 0%, transparent 60%);
    animation: bgPulse 8s ease-in-out infinite alternate;
}
@keyframes bgPulse { 0% { opacity: 0.7; } 100% { opacity: 1; } }

[data-theme="light"] .bg-gradient { display: none; }

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-card);
    backdrop-filter: blur(24px);
    border-right: 1px solid var(--border-default);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-smooth);
}

.sidebar-logo {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}
.sidebar-logo .logo-icon {
    font-size: 1.8rem;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.4));
}
.sidebar-logo .logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}
.sidebar-logo .logo-badge {
    background: var(--accent-gradient);
    color: #fff;
    font-size: 0.6rem;
    padding: 2px 7px;
    border-radius: 5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.sidebar-nav { flex: 1; padding: 12px 8px; overflow-y: auto; }
.sidebar-nav a, .sidebar-nav button {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    cursor: pointer;
    font-family: inherit;
}
.sidebar-nav a:hover, .sidebar-nav button:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
}
.sidebar-nav a.active {
    background: rgba(99, 102, 241, 0.12);
    color: var(--accent-primary);
}
.sidebar-nav .nav-icon { font-size: 1.15rem; width: 24px; text-align: center; }
.sidebar-nav .nav-section {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 20px 16px 8px;
}

.sidebar-footer {
    padding: 12px 8px;
    border-top: 1px solid var(--border-default);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 32px 40px;
    min-width: 0;
}

/* ── Page Header ─────────────────────────────────────────── */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
}
.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}
.page-header .subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* ── Cards ───────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}
.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-elevated);
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.card-title {
    font-size: 1rem;
    font-weight: 600;
}

/* ── Grid ────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ── Stat Cards ──────────────────────────────────────────── */
.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all var(--transition-normal);
}
.stat-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-2px);
}
.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}
.stat-icon.purple { background: rgba(139, 92, 246, 0.12); }
.stat-icon.blue { background: rgba(59, 130, 246, 0.12); }
.stat-icon.green { background: rgba(16, 185, 129, 0.12); }
.stat-icon.amber { background: rgba(245, 158, 11, 0.12); }
.stat-value { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; }
.stat-label { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
}
.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.35);
}
.btn-secondary {
    background: rgba(99, 102, 241, 0.08);
    color: var(--accent-primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}
.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.15);
}
.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}
.btn-danger:hover { background: rgba(239, 68, 68, 0.2); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-icon { padding: 8px; border-radius: var(--radius-sm); }

/* ── Form Inputs ─────────────────────────────────────────── */
.form-group { margin-bottom: 20px; }
.form-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 11px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.92rem;
    font-family: inherit;
    outline: none;
    transition: all 0.2s ease;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--border-accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
    background: var(--bg-input-focus);
}
.form-input::placeholder { color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 100px; }
.form-select { cursor: pointer; }

/* ── Table ───────────────────────────────────────────────── */
.table-container { overflow-x: auto; }
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-default);
}
.data-table td {
    padding: 14px 16px;
    font-size: 0.88rem;
    border-bottom: 1px solid var(--border-default);
    vertical-align: middle;
}
.data-table tbody tr { transition: background var(--transition-fast); }
.data-table tbody tr:hover { background: rgba(99, 102, 241, 0.04); }

/* ── Badges ──────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.badge-math { background: rgba(59, 130, 246, 0.12); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.2); }
.badge-physics { background: rgba(16, 185, 129, 0.12); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.2); }
.badge-draft { background: rgba(148, 163, 184, 0.12); color: var(--text-secondary); border: 1px solid rgba(148, 163, 184, 0.2); }
.badge-active { background: rgba(16, 185, 129, 0.12); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.2); }
.badge-published { background: rgba(99, 102, 241, 0.12); color: var(--accent-primary); border: 1px solid rgba(99, 102, 241, 0.2); }
.badge-archived { background: rgba(245, 158, 11, 0.12); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.badge-error { background: rgba(239, 68, 68, 0.12); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); }

/* ── Modal ───────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 580px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-elevated);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px 16px;
    border-bottom: 1px solid var(--border-default);
}
.modal-header h2 { font-size: 1.15rem; font-weight: 600; }
.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px;
    transition: color var(--transition-fast);
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { padding: 24px 28px; }
.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 28px 24px;
    border-top: 1px solid var(--border-default);
}

/* ── Toast Notifications ─────────────────────────────────── */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    box-shadow: var(--shadow-elevated);
    animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }
.toast-info { border-left: 3px solid var(--info); }

/* ── Token Display ───────────────────────────────────────── */
.token-display {
    background: var(--bg-secondary);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    word-break: break-all;
    position: relative;
    animation: tokenGlow 2s ease-in-out infinite alternate;
}
@keyframes tokenGlow {
    0% { box-shadow: 0 0 8px rgba(99, 102, 241, 0.15); }
    100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
}
.token-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 6px;
    color: var(--accent-primary);
    font-size: 0.75rem;
    cursor: pointer;
    font-family: inherit;
}

/* ── Empty State ─────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.5; }
.empty-state h3 { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 8px; }

/* ── Animations ──────────────────────────────────────────── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}
.fade-in { animation: fadeIn 0.4s ease; }
.slide-up { animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 20px 16px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; gap: 12px; }
    .mobile-menu-btn { display: block !important; }
}

/* ── Mobile Menu Button ──────────────────────────────────── */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 200;
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 10px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.2rem;
}

/* ── Theme Toggle ────────────────────────────────────────── */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}
.theme-toggle:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
}

/* ── Project Card ────────────────────────────────────────── */
.project-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.project-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-elevated);
}
.project-card:hover::before { opacity: 1; }
.project-card .project-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.project-card .project-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.project-card .project-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(99, 102, 241, 0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(99, 102, 241, 0.4); }

/* ── Loading Spinner ─────────────────────────────────────── */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }