/* ============================================
   EXAMGEN ENTERPRISE — Rich Dark Design System
   Inspired by: Stripe / Linear / Vercel
   ============================================ */

:root {
    /* Deep Background Layers */
    --c-bg-base: #0a0a0b;
    --c-bg-surface: #111113;
    --c-bg-card: #18181b;
    --c-bg-hover: #1f1f23;
    --c-bg-elevated: #222227;
    
    /* Borders */
    --c-border-subtle: #1e1e22;
    --c-border-default: #27272b;
    --c-border-strong: #34343a;
    
    /* Accent — Warm Indigo */
    --c-accent: #818cf8;
    --c-accent-hover: #6366f1;
    --c-accent-dim: rgba(129,140,248,0.08);
    --c-accent-glow: rgba(129,140,248,0.15);
    --c-accent-text: #a5b4fc;
    
    /* Semantic */
    --c-green: #34d399;
    --c-green-dim: rgba(52,211,153,0.08);
    --c-amber: #fbbf24;
    --c-amber-dim: rgba(251,191,36,0.08);
    --c-red: #f87171;
    --c-red-dim: rgba(248,113,113,0.08);
    
    /* Text */
    --c-text-primary: #fafafa;
    --c-text-secondary: #a1a1aa;
    --c-text-tertiary: #71717a;
    --c-text-disabled: #52525b;
    
    /* Shadows */
    --shadow-xs: 0 1px 1px rgba(0,0,0,0.3);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.6);
    --shadow-glow: 0 0 20px var(--c-accent-glow);
    
    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Fonts */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ===== DARK MODE OVERRIDE ===== */
[data-theme="dark"] {
    --bg-primary: var(--c-bg-base);
    --bg-white: var(--c-bg-card);
    --bg-off-white: var(--c-bg-surface);
    --bg-dark: #060608;
    --border-light: var(--c-border-subtle);
    --border-medium: var(--c-border-default);
    --text-primary: var(--c-text-primary);
    --text-secondary: var(--c-text-secondary);
    --text-tertiary: var(--c-text-tertiary);
    --accent-primary: var(--c-accent);
    --accent-primary-light: var(--c-accent-text);
    --accent-primary-dark: var(--c-accent-hover);
    --accent-green: var(--c-green);
}

/* ===== RESET ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; font-size: 15px; }
body {
    font-family: var(--font); background: var(--c-bg-base); color: var(--c-text-primary);
    line-height: 1.55; letter-spacing: -0.01em;
}
a { color: inherit; text-decoration: none; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border-strong); border-radius: 3px; }

/* ===== LAYOUT ===== */
.dashboard-page { display: flex; min-height: 100vh; }
.main-content { flex: 1; margin-left: 236px; min-height: 100vh; background: var(--c-bg-base); }

/* ===== SIDEBAR ===== */
.sidebar {
    width: 236px; height: 100vh; position: fixed; top: 0; left: 0; z-index: 100;
    background: var(--c-bg-surface); border-right: 1px solid var(--c-border-subtle);
    display: flex; flex-direction: column; transition: transform var(--transition);
}
.sidebar-header {
    padding: 22px 18px; border-bottom: 1px solid var(--c-border-subtle);
    display: flex; align-items: center; gap: 6px;
}
.sidebar-logo {
    font-size: 1.05rem; font-weight: 700; letter-spacing: -0.02em;
    color: var(--c-text-primary); display: flex; align-items: center; gap: 7px;
}
.sidebar-logo .ent-badge {
    font-size: 0.6rem; font-weight: 800; letter-spacing: 0.08em;
    background: var(--c-accent-dim); color: var(--c-accent-text);
    padding: 2px 6px; border-radius: 4px;
}
.sidebar-nav { flex: 1; padding: 14px 8px; display: flex; flex-direction: column; gap: 1px; overflow-y: auto; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 10px; padding: 9px 12px;
    border-radius: var(--radius-md); font-size: 0.84rem; font-weight: 450;
    color: var(--c-text-tertiary); transition: var(--transition-fast);
}
.sidebar-nav a:hover { background: var(--c-bg-hover); color: var(--c-text-primary); }
.sidebar-nav a.active { background: var(--c-accent-dim); color: var(--c-accent-text); font-weight: 550; }
.sidebar-nav a .nav-icon { width: 17px; height: 17px; opacity: 0.5; flex-shrink: 0; }
.sidebar-nav a.active .nav-icon { opacity: 1; }
.sidebar-footer {
    padding: 14px 18px; border-top: 1px solid var(--c-border-subtle);
    font-size: 0.73rem; color: var(--c-text-disabled);
}
.sidebar-footer a { color: var(--c-accent-text); }
.sidebar-footer a:hover { text-decoration: underline; }

/* ===== TOPBAR ===== */
.topbar {
    height: 52px; background: var(--c-bg-surface); border-bottom: 1px solid var(--c-border-subtle);
    display: flex; align-items: center; padding: 0 22px; position: sticky; top: 0; z-index: 50;
}
.sidebar-toggle {
    display: none; background: none; border: none; cursor: pointer;
    color: var(--c-text-tertiary); padding: 5px; border-radius: var(--radius-sm);
}
.sidebar-toggle:hover { background: var(--c-bg-hover); color: var(--c-text-primary); }

/* ===== CONTENT ===== */
.content { max-width: 1240px; margin: 0 auto; padding: 30px 26px; }

/* ===== PAGE HEADER ===== */
.page-header { margin-bottom: 26px; }
.page-header h1 { font-size: 1.45rem; font-weight: 700; letter-spacing: -0.03em; color: var(--c-text-primary); }
.page-header p { color: var(--c-text-secondary); font-size: 0.88rem; margin-top: 3px; }

/* ===== STAT CARDS ===== */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 13px; margin-bottom: 26px; }
.stat-card {
    background: var(--c-bg-card); border: 1px solid var(--c-border-subtle);
    border-radius: var(--radius-lg); padding: 18px 20px;
    display: flex; align-items: center; gap: 14px; transition: var(--transition);
}
.stat-card:hover { border-color: var(--c-border-default); }
.stat-icon {
    width: 40px; height: 40px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center; font-size: 1.05rem; flex-shrink: 0;
}
.stat-icon.accent { background: var(--c-accent-dim); color: var(--c-accent-text); }
.stat-icon.green { background: var(--c-green-dim); color: var(--c-green); }
.stat-icon.amber { background: var(--c-amber-dim); color: var(--c-amber); }
.stat-icon.red { background: var(--c-red-dim); color: var(--c-red); }
.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--c-text-primary); line-height: 1; letter-spacing: -0.03em; }
.stat-label { font-size: 0.72rem; color: var(--c-text-tertiary); margin-top: 2px; font-weight: 450; }

/* ===== CARDS ===== */
.card {
    background: var(--c-bg-card); border: 1px solid var(--c-border-subtle);
    border-radius: var(--radius-lg); padding: 22px; transition: var(--transition);
}
.card:hover { border-color: var(--c-border-default); }
.card-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px; padding-bottom: 13px; border-bottom: 1px solid var(--c-border-subtle);
}
.card-header h3 { font-size: 0.92rem; font-weight: 650; color: var(--c-text-primary); letter-spacing: -0.01em; }
.card-link { font-size: 0.8rem; font-weight: 500; color: var(--c-accent-text); }
.card-link:hover { color: var(--c-accent); }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    padding: 9px 18px; border-radius: var(--radius-md);
    font-family: var(--font); font-weight: 550; font-size: 0.84rem;
    cursor: pointer; transition: var(--transition-fast); border: none;
    white-space: nowrap; line-height: 1; letter-spacing: -0.01em;
}
.btn-primary { background: var(--c-accent); color: #0a0a0b; }
.btn-primary:hover { background: var(--c-accent-hover); }
.btn-outline { background: transparent; border: 1px solid var(--c-border-default); color: var(--c-text-secondary); }
.btn-outline:hover { border-color: var(--c-border-strong); color: var(--c-text-primary); }
.btn-ghost { background: transparent; color: var(--c-text-tertiary); }
.btn-ghost:hover { background: var(--c-bg-hover); color: var(--c-text-primary); }
.btn-danger { background: transparent; border: 1px solid rgba(248,113,113,0.2); color: var(--c-red); }
.btn-danger:hover { background: var(--c-red-dim); border-color: var(--c-red); }
.btn-sm { padding: 6px 12px; font-size: 0.77rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 12px 24px; font-size: 0.9rem; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ===== INPUTS ===== */
.input, .select, .textarea {
    width: 100%; padding: 10px 13px; background: var(--c-bg-surface);
    border: 1px solid var(--c-border-subtle); border-radius: var(--radius-md);
    font-family: var(--font); font-size: 0.86rem; color: var(--c-text-primary);
    transition: var(--transition-fast); outline: none;
}
.input:hover, .select:hover, .textarea:hover { border-color: var(--c-border-default); }
.input:focus, .select:focus, .textarea:focus {
    border-color: var(--c-accent); box-shadow: 0 0 0 3px var(--c-accent-dim);
}
.input::placeholder, .textarea::placeholder { color: var(--c-text-disabled); }
.select {
    cursor: pointer; appearance: none; padding-right: 34px;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2371717a' stroke-width='1.3' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 12px center;
}
.textarea { min-height: 90px; resize: vertical; line-height: 1.6; }

/* ===== LABEL ===== */
.label {
    display: block; font-size: 0.7rem; font-weight: 600; color: var(--c-text-tertiary);
    margin-bottom: 5px; text-transform: uppercase; letter-spacing: 0.05em;
}

/* ===== BADGES ===== */
.badge {
    display: inline-flex; align-items: center; padding: 2px 9px;
    border-radius: 50px; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.02em;
}
.badge-success { background: var(--c-green-dim); color: var(--c-green); }
.badge-warning { background: var(--c-amber-dim); color: var(--c-amber); }
.badge-error { background: var(--c-red-dim); color: var(--c-red); }
.badge-accent { background: var(--c-accent-dim); color: var(--c-accent-text); }
.badge-neutral { background: var(--c-bg-hover); color: var(--c-text-tertiary); border: 1px solid var(--c-border-subtle); }

/* ===== CODE ===== */
code, .mono { font-family: var(--font-mono); font-size: 0.79rem; }
.code-block {
    background: #050508; border: 1px solid var(--c-border-subtle);
    border-radius: var(--radius-md); padding: 15px; overflow-x: auto;
    line-height: 1.7; color: #c8c8d4; font-family: var(--font-mono); font-size: 0.78rem;
}
.code-keyword { color: #c4a5f5; } .code-string { color: #86efac; }
.code-func { color: #93c5fd; } .code-comment { color: #52525b; font-style: italic; }

/* ===== TABLES ===== */
.table-wrap { background: var(--c-bg-card); border: 1px solid var(--c-border-subtle); border-radius: var(--radius-lg); overflow: hidden; }
.table-wrap table { width: 100%; border-collapse: collapse; }
.table-wrap th {
    text-align: left; padding: 10px 15px; font-size: 0.67rem; font-weight: 650;
    text-transform: uppercase; letter-spacing: 0.06em; color: var(--c-text-tertiary);
    background: var(--c-bg-surface); border-bottom: 1px solid var(--c-border-subtle);
}
.table-wrap td { padding: 12px 15px; font-size: 0.84rem; border-bottom: 1px solid var(--c-border-subtle); }
.table-wrap tr:last-child td { border-bottom: none; }
.table-wrap tr:hover td { background: var(--c-bg-hover); }

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center; z-index: 1000;
}
.modal {
    background: var(--c-bg-card); border: 1px solid var(--c-border-subtle);
    border-radius: var(--radius-xl); padding: 34px; max-width: 500px;
    width: 92%; box-shadow: var(--shadow-lg); text-align: center;
}
.modal h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 5px; }
.modal p { color: var(--c-text-secondary); font-size: 0.86rem; margin-bottom: 18px; }
.modal code {
    display: block; padding: 14px; background: #050508; border: 1px solid var(--c-border-subtle);
    border-radius: var(--radius-md); font-family: var(--font-mono); font-size: 0.78rem;
    color: var(--c-green); margin: 14px 0; word-break: break-all; line-height: 1.5;
}

/* ===== ALERTS ===== */
.alert {
    display: flex; align-items: flex-start; gap: 10px; padding: 13px 16px;
    border-radius: var(--radius-md); font-size: 0.83rem; line-height: 1.5;
}
.alert-warning { background: var(--c-amber-dim); border: 1px solid rgba(251,191,36,0.15); color: #fcd34d; }
.alert-info { background: var(--c-accent-dim); border: 1px solid rgba(129,140,248,0.15); color: var(--c-accent-text); }

/* ===== EMPTY STATE ===== */
.empty-state { text-align: center; padding: 45px 25px; }
.empty-state .icon { font-size: 2.2rem; margin-bottom: 10px; opacity: 0.25; }
.empty-state h3 { font-size: 0.95rem; color: var(--c-text-secondary); margin-bottom: 3px; }
.empty-state p { color: var(--c-text-tertiary); font-size: 0.83rem; margin-bottom: 16px; }

/* ===== SKELETON ===== */
.skeleton {
    background: linear-gradient(90deg, var(--c-border-subtle) 25%, var(--c-bg-hover) 50%, var(--c-border-subtle) 75%);
    background-size: 200% 100%; animation: shimmer 1.5s ease-in-out infinite; border-radius: var(--radius-sm);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-text { height: 13px; margin-bottom: 7px; }
.skeleton-card { height: 76px; border-radius: var(--radius-lg); }

/* ===== UTILITY ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.flex { display: flex; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; }
.mt-2 { margin-top: 8px; } .mt-4 { margin-top: 16px; } .mt-6 { margin-top: 24px; }
.mb-4 { margin-bottom: 16px; }
.text-center { text-align: center; }
.hidden { display: none !important; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-toggle { display: flex; }
    .main-content { margin-left: 0; }
}
@media (max-width: 768px) {
    .stats-row { grid-template-columns: repeat(2, 1fr); }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .content { padding: 22px 14px; }
}
@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr; }
}