/* ============================================
   NetVision — Premium Design System v2.0
   Light-First Modern SaaS Platform
   ============================================ */

/* ---- Theme: Light (Default) ---- */
:root, [data-theme="light"] {
    --bg-body: #f1f5f9;
    --bg-sidebar: #ffffff;
    --bg-topbar: rgba(255,255,255,0.82);
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --bg-input: #f8fafc;
    --bg-input-focus: #ffffff;
    --bg-glass: rgba(0,0,0,0.02);
    --bg-hover: rgba(0,0,0,0.04);
    --bg-active: rgba(59,130,246,0.08);
    --bg-code: #f1f5f9;
    --bg-tooltip: #0f172a;

    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --border-focus: #3b82f6;
    --border-subtle: #f1f5f9;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    --text-on-accent: #ffffff;

    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: rgba(37,99,235,0.1);
    --accent-glow: rgba(37,99,235,0.2);
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);

    --success: #059669;
    --success-light: rgba(5,150,105,0.1);
    --success-bg: #ecfdf5;
    --warning: #d97706;
    --warning-light: rgba(217,119,6,0.1);
    --warning-bg: #fffbeb;
    --danger: #dc2626;
    --danger-light: rgba(220,38,38,0.1);
    --danger-bg: #fef2f2;
    --info: #7c3aed;
    --info-light: rgba(124,58,237,0.1);
    --info-bg: #f5f3ff;

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-glow: 0 0 20px rgba(37,99,235,0.15);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);

    --sidebar-width: 260px;
    --sidebar-collapsed: 72px;
    --topbar-height: 64px;

    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --transition-fast: 150ms cubic-bezier(0.4,0,0.2,1);
    --transition: 250ms cubic-bezier(0.4,0,0.2,1);
    --transition-slow: 400ms cubic-bezier(0.4,0,0.2,1);
    --transition-spring: 500ms cubic-bezier(0.34,1.56,0.64,1);

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ---- Theme: Dark ---- */
[data-theme="dark"] {
    --bg-body: #0b1121;
    --bg-sidebar: #0f172a;
    --bg-topbar: rgba(15,23,42,0.82);
    --bg-card: #1e293b;
    --bg-card-hover: #253449;
    --bg-input: #1e293b;
    --bg-input-focus: #253449;
    --bg-glass: rgba(255,255,255,0.04);
    --bg-hover: rgba(255,255,255,0.06);
    --bg-active: rgba(59,130,246,0.15);
    --bg-code: #1e293b;
    --bg-tooltip: #f8fafc;

    --border-color: rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.14);
    --border-focus: #3b82f6;
    --border-subtle: rgba(255,255,255,0.04);

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

    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: rgba(59,130,246,0.18);
    --accent-glow: rgba(59,130,246,0.3);

    --success: #10b981;
    --success-light: rgba(16,185,129,0.18);
    --success-bg: rgba(16,185,129,0.1);
    --warning: #f59e0b;
    --warning-light: rgba(245,158,11,0.18);
    --warning-bg: rgba(245,158,11,0.1);
    --danger: #ef4444;
    --danger-light: rgba(239,68,68,0.18);
    --danger-bg: rgba(239,68,68,0.1);
    --info: #8b5cf6;
    --info-light: rgba(139,92,246,0.18);
    --info-bg: rgba(139,92,246,0.1);

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px rgba(59,130,246,0.2);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 0 0 1px rgba(255,255,255,0.04);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; opacity: 0.3; }
::-webkit-scrollbar-thumb:hover { opacity: 0.6; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ---- Theme Transition ---- */
body, .sidebar, .topbar, .card, .stat-card, .modal, .alert, .btn, .form-input, .form-select, .badge {
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

/* ============================================
   AUTH PAGES
   ============================================ */
.auth-body { background: var(--bg-body); }
.auth-wrapper { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 2rem; position: relative; }
.auth-bg { position: fixed; inset: 0; overflow: hidden; pointer-events: none; z-index: 0; }
.auth-bg-grid { position: absolute; inset: 0; background-image: linear-gradient(var(--border-subtle) 1px, transparent 1px), linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px); background-size: 60px 60px; }
.auth-bg-glow { position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.3; animation: glowFloat 8s ease-in-out infinite; }
.auth-bg-glow-1 { width: 500px; height: 500px; background: rgba(59,130,246,0.12); top: -100px; right: -100px; }
.auth-bg-glow-2 { width: 400px; height: 400px; background: rgba(139,92,246,0.08); bottom: -50px; left: -50px; animation-delay: 4s; }
@keyframes glowFloat { 0%, 100% { transform: translate(0, 0) scale(1); } 50% { transform: translate(30px, -30px) scale(1.1); } }
.auth-container { position: relative; z-index: 1; width: 100%; max-width: 420px; }
.auth-logo { text-align: center; margin-bottom: 2.5rem; }
.auth-logo-icon { display: inline-flex; margin-bottom: 1rem; filter: drop-shadow(0 4px 12px rgba(59,130,246,0.25)); }
.auth-logo-text { font-size: 2rem; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; }
.auth-logo-sub { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.25rem; }
.auth-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-xl); padding: 2.5rem; box-shadow: var(--shadow-xl); }
.auth-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 0.25rem; color: var(--text-primary); }
.auth-subtitle { color: var(--text-secondary); margin-bottom: 2rem; font-size: 0.9rem; }
.auth-form .form-group { margin-bottom: 1.25rem; }
.auth-form .form-group:last-of-type { margin-bottom: 2rem; }
.auth-footer { position: relative; z-index: 1; margin-top: 2rem; color: var(--text-muted); font-size: 0.8rem; }

/* ============================================
   FORMS
   ============================================ */
.form-label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.5rem; letter-spacing: 0.02em; text-transform: uppercase; }
.form-input, .form-select, .form-control {
    width: 100%; padding: 0.7rem 1rem; background: var(--bg-input); border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md); color: var(--text-primary); transition: all var(--transition-fast); outline: none; font-size: 0.9rem;
}
.form-input:hover, .form-select:hover, .form-control:hover { border-color: var(--border-hover); }
.form-input:focus, .form-select:focus, .form-control:focus {
    background: var(--bg-input-focus); border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-light); }
.form-input::placeholder, .form-control::placeholder { color: var(--text-muted); }
.form-input.error, .form-control.error { border-color: var(--danger); box-shadow: 0 0 0 3px var(--danger-light); }
.form-input.success, .form-control.success { border-color: var(--success); box-shadow: 0 0 0 3px var(--success-light); }
.form-input:disabled, .form-control:disabled, .form-select:disabled { opacity: 0.5; cursor: not-allowed; background: var(--bg-glass); }
.form-group { margin-bottom: 1.25rem; }
.form-hint { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.35rem; }
.form-error { font-size: 0.75rem; color: var(--danger); margin-top: 0.35rem; }
.input-icon-wrapper { position: relative; }
.input-icon-wrapper .form-input, .input-icon-wrapper .form-control { padding-left: 2.75rem; }
.input-icon { position: absolute; left: 0.875rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); pointer-events: none; }
.input-toggle-password { position: absolute; right: 0.75rem; top: 50%; transform: translateY(-50%); background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 0.25rem; }
.input-toggle-password:hover { color: var(--text-secondary); }
textarea.form-input, textarea.form-control { min-height: 100px; resize: vertical; }

/* Custom Checkbox */
.form-check { display: flex; align-items: center; gap: 0.625rem; cursor: pointer; font-size: 0.9rem; color: var(--text-secondary); }
.form-check input[type="checkbox"] { width: 18px; height: 18px; border-radius: var(--radius-xs); border: 1.5px solid var(--border-color); appearance: none; -webkit-appearance: none; cursor: pointer; position: relative; background: var(--bg-input); transition: all var(--transition-fast); flex-shrink: 0; }
.form-check input[type="checkbox"]:checked { background: var(--accent); border-color: var(--accent); }
.form-check input[type="checkbox"]:checked::after { content: ''; position: absolute; left: 5px; top: 2px; width: 5px; height: 9px; border: solid white; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.form-check input[type="checkbox"]:focus { box-shadow: 0 0 0 3px var(--accent-light); }

/* Toggle Switch */
.toggle-switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; cursor: pointer; inset: 0; background: var(--border-color); border-radius: var(--radius-full); transition: var(--transition-fast); }
.toggle-slider::before { content: ''; position: absolute; height: 18px; width: 18px; left: 3px; bottom: 3px; background: white; border-radius: 50%; transition: var(--transition-fast); box-shadow: var(--shadow-xs); }
.toggle-switch input:checked + .toggle-slider { background: var(--accent); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ============================================
   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: 0.85rem;
    border: 1.5px solid transparent; cursor: pointer; transition: all var(--transition-fast);
    position: relative; overflow: hidden; white-space: nowrap; line-height: 1.4;
}
.btn:active { transform: scale(0.97); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-full { width: 100%; }
.btn-primary { background: var(--accent); color: var(--text-on-accent); border-color: var(--accent); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); box-shadow: var(--shadow-md), var(--shadow-glow); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border-color: var(--border-color); box-shadow: var(--shadow-xs); }
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--border-hover); box-shadow: var(--shadow-sm); }
.btn-outline { background: transparent; color: var(--text-secondary); border-color: var(--border-color); }
.btn-outline:hover { background: var(--bg-hover); border-color: var(--border-hover); color: var(--text-primary); }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; }
.btn-success { background: var(--success); color: white; border-color: var(--success); }
.btn-ghost { background: transparent; color: var(--text-secondary); border: none; }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.8rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 0.8rem 1.75rem; font-size: 0.95rem; }
.btn-icon-only { padding: 0.5rem; width: 36px; height: 36px; border-radius: var(--radius-sm); }

/* ============================================
   ALERTS
   ============================================ */
.alert { padding: 0.875rem 1rem; border-radius: var(--radius-md); font-size: 0.875rem; margin-bottom: 1.25rem; display: flex; align-items: flex-start; gap: 0.625rem; border: 1px solid transparent; }
.alert svg { flex-shrink: 0; margin-top: 1px; }
.alert-success { background: var(--success-bg); color: var(--success); border-color: rgba(5,150,105,0.2); }
.alert-danger { background: var(--danger-bg); color: var(--danger); border-color: rgba(220,38,38,0.2); }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-color: rgba(217,119,6,0.2); }
.alert-info { background: var(--info-bg); color: var(--info); border-color: rgba(124,58,237,0.2); }

/* ============================================
   ADMIN LAYOUT
   ============================================ */
.admin-wrapper { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: var(--sidebar-width); height: 100vh; position: fixed; top: 0; left: 0;
    background: var(--bg-sidebar); border-right: 1px solid var(--border-color);
    display: flex; flex-direction: column; z-index: 100;
    transition: width var(--transition), background-color var(--transition), border-color var(--transition);
    overflow: hidden;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar.collapsed .sidebar-brand, .sidebar.collapsed .sidebar-version,
.sidebar.collapsed .nav-item span, .sidebar.collapsed .nav-badge,
.sidebar.collapsed .sidebar-section-title { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; padding: 0.7rem; margin: 2px 0.5rem; }
.sidebar.collapsed .nav-item svg { margin: 0; }
.sidebar.collapsed .sidebar-header { justify-content: center; padding: 1.25rem 0.5rem; }
.sidebar.collapsed .sidebar-footer .nav-item { justify-content: center; }

.sidebar-header { padding: 1.25rem 1.25rem; display: flex; align-items: center; gap: 0.75rem; border-bottom: 1px solid var(--border-color); min-height: var(--topbar-height); }
.sidebar-logo-icon { flex-shrink: 0; }
.sidebar-brand { font-size: 1.15rem; font-weight: 700; white-space: nowrap; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-version { font-size: 0.65rem; color: var(--text-muted); white-space: nowrap; }
.sidebar-nav { flex: 1; overflow-y: auto; padding: 0.75rem 0; }
.sidebar-section { padding: 0 0.75rem; margin-bottom: 0.5rem; }
.sidebar-section-title { font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); padding: 0.75rem 0.75rem 0.35rem; }
.nav-item {
    display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 1rem; margin: 1px 0.5rem;
    border-radius: var(--radius-sm); color: var(--text-secondary); transition: all var(--transition-fast);
    white-space: nowrap; font-size: 0.875rem; font-weight: 500; position: relative; text-decoration: none;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
.nav-item.active::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 3px; height: 55%; background: var(--accent); border-radius: 0 3px 3px 0; }
.nav-item svg { flex-shrink: 0; width: 20px; height: 20px; }
.nav-item .nav-badge { margin-left: auto; background: var(--danger); color: white; font-size: 0.65rem; font-weight: 700; padding: 0.1rem 0.45rem; border-radius: var(--radius-full); min-width: 18px; text-align: center; }
.sidebar-footer { padding: 0.75rem; border-top: 1px solid var(--border-color); }

/* Main Content */
.main-content { margin-left: var(--sidebar-width); flex: 1; display: flex; flex-direction: column; min-height: 100vh; transition: margin-left var(--transition); }
.sidebar.collapsed ~ .main-content { margin-left: var(--sidebar-collapsed); }

/* Topbar */
.topbar {
    height: var(--topbar-height); background: var(--bg-topbar); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color); display: flex; align-items: center;
    justify-content: space-between; padding: 0 1.75rem; position: sticky; top: 0; z-index: 50;
}
.topbar-left { display: flex; align-items: center; gap: 1rem; }
.topbar-toggle { display: none; background: none; border: none; color: var(--text-secondary); cursor: pointer; padding: 0.5rem; border-radius: var(--radius-sm); }
.topbar-toggle:hover { background: var(--bg-hover); }
.topbar-collapse-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 0.5rem; border-radius: var(--radius-sm); transition: all var(--transition-fast); }
.topbar-collapse-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.topbar-breadcrumb { display: flex; align-items: center; gap: 0.5rem; color: var(--text-muted); font-size: 0.875rem; }
.topbar-breadcrumb .current { color: var(--text-primary); font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 0.5rem; }
.topbar-btn { position: relative; background: none; border: 1.5px solid var(--border-color); color: var(--text-secondary); cursor: pointer; padding: 0.45rem; border-radius: var(--radius-sm); transition: all var(--transition-fast); width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; }
.topbar-btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--border-hover); }
.topbar-btn .badge-dot { position: absolute; top: 4px; right: 4px; width: 8px; height: 8px; background: var(--danger); border-radius: 50%; border: 2px solid var(--bg-card); }
.topbar-user { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; padding: 0.3rem 0.6rem 0.3rem 0.3rem; border-radius: var(--radius-md); transition: background var(--transition-fast); border: 1.5px solid var(--border-color); }
.topbar-user:hover { background: var(--bg-hover); border-color: var(--border-hover); }
.topbar-avatar { width: 32px; height: 32px; border-radius: var(--radius-sm); background: var(--accent-gradient); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.75rem; color: white; flex-shrink: 0; }
.topbar-user-info { line-height: 1.2; }
.topbar-user-name { font-size: 0.8rem; font-weight: 600; color: var(--text-primary); }
.topbar-user-role { font-size: 0.65rem; color: var(--text-muted); }

/* Page Content */
.page-content { flex: 1; padding: 2rem; max-width: 1440px; width: 100%; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2rem; flex-wrap: wrap; gap: 1rem; }
.page-title { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text-primary); }
.page-subtitle { font-size: 0.875rem; color: var(--text-muted); margin-top: 0.15rem; }
.page-actions, .page-header-actions { display: flex; gap: 0.5rem; align-items: center; }

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); overflow: hidden; transition: all var(--transition);
    box-shadow: var(--shadow-card);
}
.card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-sm); }
.card-header { padding: 1.125rem 1.5rem; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
.card-title { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.card-body { padding: 1.5rem; }
.card-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border-color); background: var(--bg-glass); }

/* Stat Cards */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-bottom: 1.75rem; }
.stat-grid-4 { grid-template-columns: repeat(4, 1fr); }
.stat-grid-5 { grid-template-columns: repeat(5, 1fr); }
.stat-grid-6 { grid-template-columns: repeat(6, 1fr); }
.stats-grid { display: grid; gap: 1rem; margin-bottom: 1.75rem; }
.stat-card {
    background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg);
    padding: 1.375rem 1.5rem; display: flex; align-items: flex-start; gap: 1rem;
    transition: all var(--transition); position: relative; overflow: hidden;
    box-shadow: var(--shadow-card); text-decoration: none; color: inherit;
}
.stat-card:hover { border-color: var(--border-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; border-radius: 3px 3px 0 0; opacity: 0; transition: opacity var(--transition); }
.stat-card:hover::after { opacity: 1; }
.stat-card.success::after { background: var(--success); opacity: 1; }
.stat-card.danger::after { background: var(--danger); opacity: 1; }
.stat-card.warning::after { background: var(--warning); opacity: 1; }
.stat-card.info::after { background: var(--info); opacity: 1; }
.stat-card.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.stat-icon { width: 46px; height: 46px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.stat-icon.success { background: var(--success-light); color: var(--success); }
.stat-icon.danger { background: var(--danger-light); color: var(--danger); }
.stat-icon.warning { background: var(--warning-light); color: var(--warning); }
.stat-icon.info { background: var(--info-light); color: var(--info); }
.stat-icon.accent { background: var(--accent-light); color: var(--accent); }
.stat-info { flex: 1; }
.stat-label { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; margin-bottom: 0.3rem; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-size: 1.75rem; font-weight: 700; line-height: 1.2; color: var(--text-primary); }
.stat-change { font-size: 0.75rem; margin-top: 0.25rem; }

/* ============================================
   TABLES
   ============================================ */
.table-wrapper, .table-responsive { overflow-x: auto; }
.table { width: 100%; }
.table th {
    padding: 0.75rem 1.25rem; text-align: left; font-size: 0.7rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted);
    border-bottom: 1px solid var(--border-color); white-space: nowrap;
    background: var(--bg-glass); position: sticky; top: 0; z-index: 5;
}
.table td { padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--border-subtle); font-size: 0.875rem; color: var(--text-primary); vertical-align: middle; }
.table tbody tr { transition: background var(--transition-fast); }
.table tbody tr:hover td { background: var(--bg-hover); }
.table tbody tr:last-child td { border-bottom: none; }

/* ============================================
   BADGES
   ============================================ */
.badge { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.2rem 0.65rem; border-radius: var(--radius-full); font-size: 0.7rem; font-weight: 600; white-space: nowrap; letter-spacing: 0.02em; }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info { background: var(--info-light); color: var(--info); }
.badge-secondary { background: var(--bg-hover); color: var(--text-secondary); }

/* ============================================
   STATUS
   ============================================ */
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 0.5rem; flex-shrink: 0; }
.status-dot.online, .status-dot-online { background: var(--success); box-shadow: 0 0 8px var(--success); animation: statusPulse 2s infinite; }
.status-dot.offline, .status-dot-offline { background: var(--danger); }
.status-dot.warning, .status-dot-warning { background: var(--warning); box-shadow: 0 0 8px var(--warning); }
.status-dot.unknown, .status-dot-unknown { background: var(--text-muted); }
.status-dot-maintenance { background: var(--info); }
@keyframes statusPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ============================================
   MODAL
   ============================================ */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(4px); z-index: 1000; display: none; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-xl); width: 100%; max-width: 500px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-xl); }
.modal-header { padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
.modal-body { padding: 1.5rem; }
.modal-footer { padding: 1rem 1.5rem; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 0.5rem; }

/* ============================================
   TABS
   ============================================ */
.tabs, .tab-nav { display: flex; border-bottom: 2px solid var(--border-color); gap: 0; margin-bottom: 1.75rem; }
.tab, .tab-btn { padding: 0.75rem 1.25rem; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); border-bottom: 2px solid transparent; cursor: pointer; transition: all var(--transition-fast); margin-bottom: -2px; background: none; border-top: none; border-left: none; border-right: none; }
.tab:hover, .tab-btn:hover { color: var(--text-primary); }
.tab.active, .tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================
   SETTINGS — Premium segmented tabs + content shell
   ============================================ */
.settings-shell { max-width: 960px; margin: 0 auto; }
/* Kartlar kabuğu tam doldurur (ortalanmış simetrik kabuk -> asimetrik boşluk biter).
   .settings-grid çocuğu kartlar zaten kendi kuralıyla yönetilir. */
.settings-shell .tab-content > .card,
.settings-shell .settings-subpanel > .card { max-width: none; width: 100%; }

/* Üst premium segmented (pill) sekme barı — kaydırılırken yapışkan kalır */
.settings-tabs {
    display: flex; gap: 0.25rem;
    background: var(--bg-glass); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); padding: 0.35rem;
    margin-bottom: 1.75rem;
    overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none;
    position: sticky; top: 0.5rem; z-index: 20;
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
}
.settings-tabs::-webkit-scrollbar { display: none; }
.settings-tab {
    display: inline-flex; align-items: center; gap: 0.5rem; white-space: nowrap;
    padding: 0.6rem 1rem; border-radius: var(--radius-md);
    font-size: 0.875rem; font-weight: 600; color: var(--text-secondary);
    cursor: pointer; border: none; background: none;
    transition: all var(--transition-fast);
}
.settings-tab:hover { background: var(--bg-hover); color: var(--text-primary); }
.settings-tab .settings-tab-ico { flex-shrink: 0; width: 17px; height: 17px; opacity: 0.9; }
.settings-tab.active {
    background: var(--bg-card); color: var(--accent);
    box-shadow: var(--shadow-sm);
}

/* Panel başlığı (ikon + başlık + açıklama) */
.settings-section-head { display: flex; align-items: center; gap: 0.85rem; margin-bottom: 1.25rem; }
.settings-section-head .settings-section-ico {
    flex-shrink: 0; display: grid; place-items: center;
    width: 42px; height: 42px; border-radius: var(--radius-md);
    background: var(--accent-light); color: var(--accent);
}
.settings-section-head h2 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text-primary); line-height: 1.2; }
.settings-section-head p { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }

/* Boş alanı dolduran çok kolonlu kart yerleşimi */
.settings-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 1.25rem; align-items: start;
}
.settings-grid > .card { max-width: none; margin: 0; }

/* Bildirimler — zengin kanal kartı seçici (master) */
.channel-picker {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 0.85rem; margin-bottom: 1.5rem;
}
.channel-card {
    position: relative; display: flex; align-items: center; gap: 0.8rem;
    padding: 0.95rem 1rem; text-align: left; cursor: pointer;
    background: var(--bg-card); border: 1.5px solid var(--border-color);
    border-radius: var(--radius-lg); transition: all var(--transition-fast);
}
.channel-card:hover { border-color: var(--border-hover); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.channel-card .channel-ico {
    flex-shrink: 0; display: grid; place-items: center;
    width: 40px; height: 40px; border-radius: var(--radius-md);
    background: var(--bg-glass); color: var(--text-secondary);
    transition: all var(--transition-fast);
}
.channel-card .channel-ico svg { width: 20px; height: 20px; }
.channel-card .channel-meta { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.channel-card .channel-name { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); line-height: 1.1; }
.channel-status {
    display: inline-flex; align-items: center; gap: 0.3rem;
    font-size: 0.7rem; font-weight: 600; color: var(--text-muted);
}
.channel-status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-muted); }
.channel-status.is-on { color: var(--success); }
.channel-status.is-on .dot { background: var(--success); box-shadow: 0 0 0 3px var(--success-light); }
.channel-card.active {
    border-color: var(--accent); background: var(--accent-light);
    box-shadow: var(--shadow-sm);
}
.channel-card.active .channel-ico { background: var(--accent); color: #fff; }
.channel-card.active .channel-name { color: var(--accent); }
/* Aktif kartın altında ok/işaret (seçili kanal -> aşağıdaki form) */
.channel-card.active::after {
    content: ""; position: absolute; left: 50%; bottom: -8px; transform: translateX(-50%) rotate(45deg);
    width: 12px; height: 12px; background: var(--accent-light);
    border-right: 1.5px solid var(--accent); border-bottom: 1.5px solid var(--accent);
}

.settings-subpanel { display: none; }
.settings-subpanel.active { display: block; }

/* İlişkili sayfa bağlantı kartları (İzleme: MIB / SNMP şablonları) */
.settings-linkcards {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.85rem; margin-bottom: 1.5rem;
}
.settings-linkcard {
    display: flex; align-items: center; gap: 0.85rem;
    padding: 1rem 1.1rem; text-decoration: none;
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); transition: all var(--transition-fast);
}
.settings-linkcard:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.settings-linkcard .lc-ico {
    flex-shrink: 0; display: grid; place-items: center;
    width: 42px; height: 42px; border-radius: var(--radius-md);
    background: var(--accent-light); color: var(--accent);
}
.settings-linkcard .lc-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.settings-linkcard .lc-title { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); }
.settings-linkcard .lc-desc { font-size: 0.76rem; color: var(--text-muted); line-height: 1.3; }
.settings-linkcard .lc-arrow { flex-shrink: 0; color: var(--text-muted); transition: transform var(--transition-fast); }
.settings-linkcard:hover .lc-arrow { color: var(--accent); transform: translateX(3px); }

/* Responsive form satırları (yalnız /settings kabuğu): geniş ekranda çok kolon,
   dar ekranda tek kolon — eski inline 1fr 1fr / 1fr 1fr 1fr grid'lerin mobilde
   taşmasını giderir. Diğer view'lardaki .form-row etkilenmez. */
.settings-shell .form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; }
.settings-shell .form-row > * { min-width: 0; }
/* Tam genişlik kartta tek başına duran kısa sayısal alanlar aşırı uzamasın
   (form-row/field-inline içindeki alanlar daha derinde olduğundan etkilenmez). */
.settings-shell .card-body form > .form-group > input[type="number"] { max-width: 340px; }
/* select + özel-değer input ikilisi: masaüstünde 1fr/160px, mobilde alt alta */
.settings-shell .field-inline { display: grid; grid-template-columns: 1fr 160px; gap: 0.75rem; align-items: start; }
.settings-shell .field-inline > * { min-width: 0; }

@media (max-width: 640px) {
    .settings-grid { grid-template-columns: 1fr; }
    .settings-tab { padding: 0.55rem 0.8rem; }
    .settings-shell .form-row { grid-template-columns: 1fr; }
    .settings-shell .field-inline { grid-template-columns: 1fr; }
}

/* ============================================
   GRID & LAYOUT HELPERS
   ============================================ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }

/* ============================================
   PLACEHOLDER
   ============================================ */
.placeholder-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 400px; text-align: center; color: var(--text-muted); }
.placeholder-page svg { margin-bottom: 1.5rem; opacity: 0.3; }
.placeholder-page h3 { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.placeholder-page p { max-width: 400px; font-size: 0.9rem; }

/* ============================================
   UTILITIES
   ============================================ */
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 0.8rem; }
.fw-600 { font-weight: 600; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; }
.d-flex { display: flex; } .align-center { align-items: center; }
.gap-1 { gap: 0.5rem; } .gap-2 { gap: 1rem; }
.flex-1 { flex: 1; } .hidden { display: none !important; }
code { background: var(--bg-code); color: var(--accent); padding: 0.15rem 0.45rem; border-radius: var(--radius-xs); font-size: 0.8em; font-family: var(--font-mono); }

/* Spin animation */
@keyframes spin { to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }

/* ============================================
   MOBILE OVERLAY
   ============================================ */
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(2px); z-index: 99; }
.sidebar-overlay.active { display: block; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar.collapsed { width: var(--sidebar-width); }
    .main-content, .sidebar.collapsed ~ .main-content { margin-left: 0; }
    .topbar-toggle { display: flex; }
    .topbar-collapse-btn { display: none; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-grid-4,
    .stat-grid-5,
    .stat-grid-6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .grid-3 { grid-template-columns: 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
    .page-content { padding: 1.25rem; }
}
@media (max-width: 768px) {
    .stat-grid,
    .stat-grid-4,
    .stat-grid-5,
    .stat-grid-6 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
    .stat-grid,
    .stat-grid-4,
    .stat-grid-5,
    .stat-grid-6 { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .auth-card { padding: 1.5rem; }
    .topbar-user-info { display: none; }
    .page-content { padding: 1rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
}

/* ============================================
   PREMIUM POLISH — Micro Interactions
   ============================================ */

/* Page load animation */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }

.page-content { animation: fadeInUp 0.35s ease-out; }
.alert { animation: slideDown 0.3s ease-out; }

/* Card subtle hover lift */
.card { transition: all var(--transition); }
.card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-sm); }
.stat-card { transition: all var(--transition); }
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* Button micro-interactions */
.btn { transition: all var(--transition-fast); }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.97); }
.btn-primary:hover { box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow); }
.btn-primary:active { box-shadow: var(--shadow-sm); }
.btn-ghost:hover { transform: none; }
.btn-ghost:active { transform: scale(0.97); }

/* Link hover underline effect */
a:not(.btn):not(.nav-item):not(.stat-card):not(.report-card):not(.topbar-user) {
    transition: color var(--transition-fast);
}

/* Focus visible states (accessibility) */
.btn:focus-visible, .form-input:focus-visible, .form-select:focus-visible, .tab-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Nav item hover micro-animation */
.nav-item { transition: all var(--transition-fast); }
.nav-item:hover svg { transform: scale(1.08); }
.nav-item svg { transition: transform var(--transition-fast); }

/* Table row subtle animation */
.table tbody tr { transition: background-color var(--transition-fast); }
.table tbody tr:hover td { background: var(--bg-hover); }

/* Badge pulse for danger */
.badge-danger { position: relative; }

/* Skeleton loading placeholder */
.skeleton { background: linear-gradient(90deg, var(--bg-hover) 25%, var(--bg-glass) 50%, var(--bg-hover) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: var(--radius-sm); }

/* Smooth scrolling for sidebar */
.sidebar-nav { scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: transparent transparent; }
.sidebar-nav:hover { scrollbar-color: var(--text-muted) transparent; }

/* Topbar glass effect enhancement */
.topbar { transition: background-color var(--transition), border-color var(--transition); }

/* Empty state styling */
.table td[colspan] { background: transparent !important; }

/* Tooltip base */
[data-tooltip] { position: relative; }
[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%) translateY(4px);
    background: var(--bg-tooltip); color: var(--text-inverse); padding: 0.35rem 0.65rem;
    border-radius: var(--radius-sm); font-size: 0.75rem; white-space: nowrap;
    opacity: 0; pointer-events: none; transition: all var(--transition-fast); z-index: 1000;
}
[data-tooltip]:hover::after { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* Selection color */
::selection { background: var(--accent-light); color: var(--accent); }

/* Print styles */
@media print {
    .sidebar, .topbar, .sidebar-overlay, .btn, .page-actions { display: none !important; }
    .main-content { margin-left: 0 !important; }
    .page-content { padding: 0 !important; }
    .card { box-shadow: none !important; border: 1px solid #ddd !important; break-inside: avoid; }
}