/* ══════════════════════════════════════════════════════════
   style.css — PenTrix Corp Portal
   Premium Dark Theme · Glassmorphism · Micro-animations
   ══════════════════════════════════════════════════════════ */

/* ═══ CSS Variables ═══ */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1e293b;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-glass: rgba(17, 24, 39, 0.55);
    --border-color: rgba(56, 68, 93, 0.5);
    --border-light: rgba(100, 116, 139, 0.3);
    --border-glow: rgba(56, 189, 248, 0.15);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #10b981;
    --accent-hover: #34d399;
    --accent-glow: rgba(16, 185, 129, 0.25);
    --accent-soft: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-hover: #f87171;
    --danger-glow: rgba(239, 68, 68, 0.2);
    --warning: #f59e0b;
    --warning-glow: rgba(245, 158, 11, 0.15);
    --info: #38bdf8;
    --info-glow: rgba(56, 189, 248, 0.15);
    --purple: #a78bfa;
    --purple-glow: rgba(167, 139, 250, 0.15);
    --link: #38bdf8;
    --link-hover: #7dd3fc;
    --sidebar-width: 272px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
    --radius: 8px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 4px 16px rgba(0,0,0,0.25), 0 1px 3px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.35), 0 2px 8px rgba(0,0,0,0.2);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.4);
    --glass-blur: blur(16px);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ═══ Light Theme ═══ */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-color: rgba(148, 163, 184, 0.3);
    --border-light: rgba(148, 163, 184, 0.2);
    --border-glow: rgba(16, 185, 129, 0.15);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #059669;
    --accent-hover: #10b981;
    --accent-glow: rgba(5, 150, 105, 0.2);
    --accent-soft: rgba(5, 150, 105, 0.08);
    --danger: #dc2626;
    --danger-hover: #ef4444;
    --danger-glow: rgba(220, 38, 38, 0.15);
    --warning: #d97706;
    --warning-glow: rgba(217, 119, 6, 0.12);
    --info: #0284c7;
    --info-glow: rgba(2, 132, 199, 0.12);
    --purple: #7c3aed;
    --purple-glow: rgba(124, 58, 237, 0.12);
    --link: #0284c7;
    --link-hover: #0369a1;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 12px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.05);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.1), 0 2px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 16px 40px rgba(0,0,0,0.12);
}

[data-theme="light"] body {
    background-image: none;
}

[data-theme="light"] .sidebar {
    background: rgba(255, 255, 255, 0.92) !important;
    backdrop-filter: blur(20px);
    border-right-color: var(--border-color) !important;
}

[data-theme="light"] .sidebar-header {
    border-bottom-color: var(--border-color);
}

[data-theme="light"] .text-gradient {
    background: linear-gradient(135deg, var(--accent), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

html {
    font-size: 15px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse 80% 60% at 10% 10%, rgba(16, 185, 129, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 90% 90%, rgba(56, 189, 248, 0.03) 0%, transparent 60%);
}

::selection {
    background: var(--accent);
    color: white;
}

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

a {
    color: var(--link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--link-hover);
}

code, pre {
    font-family: var(--font-mono);
}

img { max-width: 100%; }

/* ═══ Sidebar ═══ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--transition-slow);
}

.sidebar.collapsed {
    transform: translateX(calc(-1 * var(--sidebar-width)));
}

.sidebar-header {
    padding: 24px 20px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.sidebar-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0.4;
}

.sidebar-header .logo {
    font-size: 1.35rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.sidebar-header .version {
    font-size: 0.65rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    font-weight: 500;
    letter-spacing: 0.3px;
}

.nav-links {
    list-style: none;
    padding: 12px 10px;
    flex: 1;
}

.nav-links li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 450;
    transition: all var(--transition);
    border-radius: var(--radius);
    margin-bottom: 2px;
    position: relative;
}

.nav-links li a:hover {
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
    transform: translateX(2px);
}

.nav-links li a.active {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 600;
    box-shadow: inset 0 0 0 1px var(--accent-glow);
}

.nav-links li a.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}

.nav-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 10px 16px;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.72rem;
    line-height: 1.6;
    background: rgba(0,0,0,0.15);
}

.debug-link {
    color: var(--text-muted) !important;
    font-size: 0.68rem;
    opacity: 0.6;
    transition: opacity var(--transition-fast) !important;
}

.debug-link:hover {
    opacity: 1;
}

.logout-link {
    color: var(--danger) !important;
}

/* ═══ Main Content ═══ */
main {
    min-height: 100vh;
    padding: 36px 40px;
}

main.with-sidebar {
    margin-left: var(--sidebar-width);
}

/* ═══ Page Headers ═══ */
.page-header {
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 120px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
}

.page-header h1 {
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.3px;
}

.page-header p {
    color: var(--text-muted);
    font-size: 0.92rem;
}

/* ═══ Cards ═══ */
.card {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
}

.card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

a.card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent-glow), var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2, .card-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.2px;
}

.card-body {
    color: var(--text-secondary);
}

/* ═══ Forms ═══ */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
input[type="search"],
textarea,
select {
    width: 100%;
    padding: 11px 16px;
    background: rgba(10, 14, 23, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    transition: all var(--transition);
    backdrop-filter: blur(4px);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow), 0 0 20px rgba(16, 185, 129, 0.08);
    background: rgba(10, 14, 23, 0.8);
}

input::placeholder, textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

/* ═══ Buttons ═══ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 0.88rem;
    font-weight: 550;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.04) 0%, transparent 100%);
    pointer-events: none;
}

.btn:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--border-light);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #059669);
    border-color: var(--accent);
    color: white;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover), #10b981);
    color: white;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    border-color: var(--danger);
    color: white;
    box-shadow: 0 2px 8px var(--danger-glow);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--danger-hover), #ef4444);
    color: white;
    box-shadow: 0 4px 20px var(--danger-glow);
}

.btn-info {
    background: linear-gradient(135deg, var(--info), #0284c7);
    border-color: var(--info);
    color: white;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
    border-radius: 10px;
}

.btn-block {
    display: flex;
    width: 100%;
    text-align: center;
}

.btn-ghost {
    background: transparent;
    border-color: var(--border-color);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.04);
}

/* ═══ Tables ═══ */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 15px 0;
}

th, td {
    padding: 13px 16px;
    text-align: left;
}

th {
    background: rgba(30, 41, 59, 0.6);
    font-weight: 600;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

th:first-child {
    border-radius: var(--radius) 0 0 0;
}
th:last-child {
    border-radius: 0 var(--radius) 0 0;
}

td {
    border-bottom: 1px solid rgba(56, 68, 93, 0.25);
}

tr {
    transition: background var(--transition-fast);
}

tr:hover td {
    background: rgba(255,255,255,0.015);
}

tr:last-child td {
    border-bottom: none;
}

/* ═══ Badges ═══ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    gap: 4px;
}

.badge-success { background: var(--accent-soft); color: var(--accent-hover); border: 1px solid var(--accent-glow); }
.badge-danger { background: rgba(239,68,68,0.12); color: var(--danger-hover); border: 1px solid var(--danger-glow); }
.badge-warning { background: rgba(245,158,11,0.12); color: var(--warning); border: 1px solid var(--warning-glow); }
.badge-info { background: rgba(56,189,248,0.12); color: var(--info); border: 1px solid var(--info-glow); }
.badge-purple { background: rgba(167,139,250,0.12); color: var(--purple); border: 1px solid var(--purple-glow); }
.badge-muted { background: rgba(30,41,59,0.5); color: var(--text-muted); border: 1px solid var(--border-color); }

/* ═══ Alerts / Flash Messages ═══ */
.flash-messages {
    margin-bottom: 24px;
}

.flash, .alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    margin-bottom: 10px;
    font-size: 0.9rem;
    border: 1px solid;
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.flash::before, .alert::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
}

.flash-success, .alert-success { background: rgba(16,185,129,0.08); border-color: var(--accent-glow); color: var(--accent-hover); }
.flash-success::before, .alert-success::before { background: var(--accent); }
.flash-error, .alert-error, .alert-danger { background: rgba(239,68,68,0.08); border-color: var(--danger-glow); color: var(--danger-hover); }
.flash-error::before, .alert-error::before, .alert-danger::before { background: var(--danger); }
.flash-warning, .alert-warning { background: rgba(245,158,11,0.08); border-color: var(--warning-glow); color: var(--warning); }
.flash-warning::before, .alert-warning::before { background: var(--warning); }
.flash-info, .alert-info { background: rgba(56,189,248,0.08); border-color: var(--info-glow); color: var(--info); }
.flash-info::before, .alert-info::before { background: var(--info); }

/* ═══ Notifications (JS) ═══ */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 28px;
    border-radius: var(--radius-lg);
    z-index: 9999;
    animation: notifSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: 420px;
    box-shadow: var(--shadow-xl);
    backdrop-filter: var(--glass-blur);
    font-weight: 500;
}

.notification-success { background: linear-gradient(135deg, rgba(16,185,129,0.92), rgba(5,150,105,0.92)); color: white; }
.notification-error { background: linear-gradient(135deg, rgba(239,68,68,0.92), rgba(220,38,38,0.92)); color: white; }
.notification-info { background: linear-gradient(135deg, rgba(56,189,248,0.92), rgba(2,132,199,0.92)); color: white; }
.notification-warning { background: linear-gradient(135deg, rgba(245,158,11,0.92), rgba(217,119,6,0.92)); color: white; }

.notification.fade-out {
    animation: notifSlideOut 0.35s cubic-bezier(0.4, 0, 1, 1) forwards;
}

@keyframes notifSlideIn {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes notifSlideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(120%); opacity: 0; }
}

/* ═══ Code Blocks ═══ */
pre {
    background: rgba(10, 14, 23, 0.7);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 18px;
    overflow-x: auto;
    font-size: 0.84rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

code {
    background: rgba(30, 41, 59, 0.5);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.84em;
    border: 1px solid rgba(56, 68, 93, 0.3);
}

pre code {
    background: none;
    padding: 0;
    border: none;
}

/* ═══ Auth Pages ═══ */
.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    background:
        radial-gradient(ellipse 50% 40% at 20% 20%, rgba(16, 185, 129, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 40% 50% at 80% 80%, rgba(56, 189, 248, 0.05) 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 50% 50%, rgba(167, 139, 250, 0.03) 0%, transparent 70%);
}

.auth-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.015'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.auth-box {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px 44px;
    width: 100%;
    max-width: 460px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
    animation: authFadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes authFadeIn {
    from { opacity: 0; transform: translateY(16px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.auth-box::after {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--accent-glow), transparent 70%);
    pointer-events: none;
    opacity: 0.5;
}

.auth-box h1 {
    text-align: center;
    margin-bottom: 6px;
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.auth-box .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 36px;
    font-size: 0.9rem;
    font-weight: 400;
}

.auth-box .error-message {
    background: rgba(239,68,68,0.1);
    border: 1px solid var(--danger-glow);
    color: var(--danger-hover);
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.88rem;
    position: relative;
    padding-left: 20px;
}

.auth-box .error-message::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--danger);
    border-radius: 3px 0 0 3px;
}

.auth-links {
    text-align: center;
    margin-top: 24px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-links a {
    font-weight: 500;
}

/* ═══ Grid Layout ═══ */
.grid {
    display: grid;
    gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1200px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    main.with-sidebar { margin-left: 0; padding: 20px 16px; }
    .sidebar { transform: translateX(calc(-1 * var(--sidebar-width))); }
    .sidebar.open { transform: translateX(0); }
    .page-header h1 { font-size: 1.5rem; }
}

/* ═══ Stat Cards ═══ */
.stat-card {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all var(--transition);
}

.stat-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--info));
    opacity: 0;
    transition: opacity var(--transition);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card .stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-card .stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Stat card accent variants */
.stat-card.info .stat-value { background: linear-gradient(135deg, var(--info), #7dd3fc); -webkit-background-clip: text; background-clip: text; }
.stat-card.info:hover::before { background: linear-gradient(90deg, var(--info), var(--purple)); }
.stat-card.warning .stat-value { background: linear-gradient(135deg, var(--warning), #fbbf24); -webkit-background-clip: text; background-clip: text; }
.stat-card.danger .stat-value { background: linear-gradient(135deg, var(--danger), var(--danger-hover)); -webkit-background-clip: text; background-clip: text; }
.stat-card.purple .stat-value { background: linear-gradient(135deg, var(--purple), #c4b5fd); -webkit-background-clip: text; background-clip: text; }

/* ═══ Progress Bar ═══ */
.progress-bar {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    height: 10px;
    overflow: hidden;
    margin: 10px 0;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--info));
    border-radius: 10px;
    transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    animation: progressShine 2s infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ═══ Flag Input ═══ */
.flag-input-group {
    display: flex;
    gap: 10px;
    max-width: 640px;
    margin: 24px 0;
}

.flag-input-group input {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.3px;
}

/* ═══ Challenge Cards ═══ */
.challenge-card {
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.challenge-card:hover {
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.05);
    transform: translateY(-2px);
}

.challenge-card.solved {
    border-color: var(--accent-glow);
    background: rgba(16, 185, 129, 0.04);
}

.challenge-card.solved::after {
    content: '\2713';
    position: absolute;
    top: 12px;
    right: 14px;
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
    box-shadow: 0 2px 8px var(--accent-glow);
}

.challenge-card .challenge-id {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-weight: 500;
}

.challenge-card .challenge-title {
    font-weight: 600;
    margin: 6px 0;
    font-size: 0.95rem;
}

/* ═══ Hint Boxes ═══ */
.hint-box {
    background: rgba(30, 41, 59, 0.4);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 14px 18px;
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: all var(--transition);
}

.hint-box.unlocked {
    border-style: solid;
    border-color: var(--warning-glow);
    background: rgba(245, 158, 11, 0.06);
    color: var(--text-secondary);
}

/* ═══ Tool Output ═══ */
.tool-output {
    background: #000a14;
    color: #4ade80;
    font-family: var(--font-mono);
    font-size: 0.84rem;
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid rgba(16, 185, 129, 0.15);
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 500px;
    overflow-y: auto;
    line-height: 1.6;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ═══ Scenario Cards ═══ */
.scenario-card {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.scenario-card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-lg);
}

.scenario-card h3 {
    background: linear-gradient(135deg, var(--accent), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    font-size: 1.15rem;
}

.scenario-steps {
    list-style: none;
    counter-reset: step;
}

.scenario-steps li {
    counter-increment: step;
    padding: 10px 0 10px 42px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.scenario-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 8px;
    width: 28px;
    height: 28px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    text-align: center;
    line-height: 26px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: all var(--transition);
}

.scenario-steps li:hover::before {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

/* ═══ Chapter List ═══ */
.chapter-item {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 18px 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 10px;
    transition: all var(--transition);
    text-decoration: none;
    color: inherit;
}

.chapter-item:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent-glow), var(--shadow);
    transform: translateX(4px);
    color: inherit;
}

.chapter-item .chapter-num {
    font-size: 1.4rem;
    font-weight: 800;
    min-width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid var(--accent-glow);
}

.chapter-item .chapter-info {
    flex: 1;
}

.chapter-item .chapter-title {
    font-weight: 600;
    margin-bottom: 2px;
}

.chapter-item .chapter-desc {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.chapter-item .chapter-progress {
    min-width: 130px;
    text-align: right;
}

/* ═══ Leaderboard ═══ */
.leaderboard-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    border-bottom: 1px solid rgba(56, 68, 93, 0.25);
    transition: background var(--transition-fast);
}

.leaderboard-row:hover {
    background: rgba(255,255,255,0.02);
}

.leaderboard-row .rank {
    font-size: 1.2rem;
    font-weight: 800;
    min-width: 40px;
    text-align: center;
    color: var(--text-muted);
}

.leaderboard-row:nth-child(1) .rank {
    color: #ffd700;
    text-shadow: 0 0 12px rgba(255, 215, 0, 0.3);
}
.leaderboard-row:nth-child(2) .rank {
    color: #e0e0e0;
    text-shadow: 0 0 12px rgba(192, 192, 192, 0.3);
}
.leaderboard-row:nth-child(3) .rank {
    color: #cd7f32;
    text-shadow: 0 0 12px rgba(205, 127, 50, 0.3);
}

/* ═══ DOM Lab Sections ═══ */
.dom-lab-section {
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: border-color var(--transition);
}

.dom-lab-section:hover {
    border-color: var(--info-glow);
}

.dom-lab-section h3 {
    color: var(--info);
    margin-bottom: 10px;
    font-size: 1.02rem;
}

.dom-lab-section .vuln-id {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--danger);
    margin-bottom: 6px;
    font-weight: 600;
}

.dom-lab-section .output-area {
    background: rgba(10, 14, 23, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px;
    min-height: 44px;
    margin-top: 10px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

/* ═══ Empty States ═══ */
.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 {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ═══ Loading Spinner ═══ */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ═══ Tooltips ═══ */
[data-tooltip] {
    position: relative;
    cursor: help;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.78rem;
    color: var(--text-primary);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
    z-index: 100;
    box-shadow: var(--shadow);
}

[data-tooltip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

/* ═══ Animations ═══ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.animate-in {
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.animate-in:nth-child(2) { animation-delay: 0.05s; }
.animate-in:nth-child(3) { animation-delay: 0.1s; }
.animate-in:nth-child(4) { animation-delay: 0.15s; }
.animate-in:nth-child(5) { animation-delay: 0.1s; }

/* ═══ Utilities ═══ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-danger { color: var(--danger); }
.text-success { color: var(--accent); }
.text-warning { color: var(--warning); }
.text-info { color: var(--info); }
.text-purple { color: var(--purple); }
.text-gradient { background: linear-gradient(135deg, var(--accent), var(--info)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-col { display: flex; flex-direction: column; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.hidden { display: none; }
.mono { font-family: var(--font-mono); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: var(--radius-lg); }
.w-full { width: 100%; }
.relative { position: relative; }
.opacity-50 { opacity: 0.5; }
.nowrap { white-space: nowrap; }

/* ═══ Print ═══ */
@media print {
    .sidebar, .notification, .debug-link { display: none !important; }
    main.with-sidebar { margin-left: 0 !important; }
    body { background: white; color: black; }
}