/* ============================================================
   WASSERKAPAZITÄTS-MANAGEMENT — Nexus-Style in Weiß & Blau
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --blue-50:  #eff6ff;
    --blue-100: #dbeafe;
    --blue-200: #bfdbfe;
    --blue-400: #60a5fa;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --blue-900: #1e3a8a;
    --sky-400:  #38bdf8;
    --sky-500:  #0ea5e9;
    --sky-600:  #0284c7;

    --grad-primary: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    --grad-hero:    linear-gradient(160deg, #e0f2fe 0%, #eff6ff 50%, #f0f9ff 100%);

    --text-primary:   #0f172a;
    --text-secondary: #475569;
    --text-muted:     #94a3b8;

    --bg-page:  #f8fafc;
    --bg-white: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.85);

    --border-light: rgba(148, 163, 184, 0.2);
    --border-blue:  rgba(59, 130, 246, 0.3);

    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 10px 40px rgba(15, 23, 42, 0.1), 0 4px 12px rgba(15, 23, 42, 0.06);
    --shadow-blue: 0 8px 32px rgba(37, 99, 235, 0.18);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* --- Base Reset & Body --- */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-page);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(14, 165, 233, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 90% 80%, rgba(37, 99, 235, 0.05) 0%, transparent 60%);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.main-content {
    flex: 1;
    padding-bottom: 2rem;
}

/* --- Animated Background Grid (subtle) --- */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    z-index: 0;
    animation: gridMove 30s linear infinite;
}

@keyframes gridMove {
    0%   { transform: translateY(0); }
    100% { transform: translateY(48px); }
}

body > * {
    position: relative;
    z-index: 1;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar-custom {
    background: var(--bg-glass) !important;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 1px 20px rgba(15, 23, 42, 0.06);
    transition: all 0.3s ease;
    padding: 0.75rem 0;
}

.navbar-custom.scrolled {
    background: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 0 2px 30px rgba(15, 23, 42, 0.1);
}

.navbar-brand-custom {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand-custom i {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.2rem;
}

.navbar-custom .nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 0.85rem !important;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    position: relative;
}

.navbar-custom .nav-link:hover {
    color: var(--blue-600) !important;
    background: var(--blue-50);
}

.navbar-custom .nav-link.active {
    color: var(--blue-600) !important;
    background: var(--blue-100);
}

.navbar-custom .nav-link-user {
    color: var(--text-muted) !important;
    font-size: 0.85rem;
    cursor: default;
}

.navbar-custom .nav-link-user:hover {
    background: transparent;
    color: var(--text-muted) !important;
}

.navbar-custom .nav-link-logout {
    color: #ef4444 !important;
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.navbar-custom .nav-link-logout:hover {
    background: rgba(239, 68, 68, 0.07) !important;
    color: #dc2626 !important;
}

.navbar-toggler {
    border: 1px solid var(--border-blue) !important;
    border-radius: var(--radius-sm) !important;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%232563eb' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
    background: var(--bg-white);
    border: 1px solid var(--border-light) !important;
    border-radius: var(--radius-md) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md) !important;
    border-color: var(--border-blue) !important;
}

.card-header {
    background: linear-gradient(to right, var(--blue-50), var(--bg-white)) !important;
    border-bottom: 1px solid var(--border-light) !important;
    border-radius: var(--radius-md) var(--radius-md) 0 0 !important;
    font-weight: 600;
    color: var(--text-primary);
    padding: 1rem 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

/* Stat cards */
.card-stat {
    background: var(--bg-white);
    border: 1px solid var(--border-light) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    overflow: hidden;
    position: relative;
}

.card-stat::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--grad-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-stat:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-blue) !important;
}

.card-stat .display-4 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.card-stat .card-title {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    border-radius: var(--radius-sm) !important;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease !important;
    letter-spacing: 0.01em;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary {
    background: var(--grad-primary) !important;
    border: none !important;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3) !important;
    color: #fff !important;
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4) !important;
    background: linear-gradient(135deg, #38bdf8 0%, #1d4ed8 100%) !important;
}

.btn-outline-primary {
    color: var(--blue-600) !important;
    border-color: var(--blue-500) !important;
    background: transparent !important;
}

.btn-outline-primary:hover {
    background: var(--blue-50) !important;
    border-color: var(--blue-600) !important;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15) !important;
}

.btn-outline-secondary {
    color: var(--text-secondary) !important;
    border-color: var(--border-light) !important;
    background: transparent !important;
}

.btn-outline-secondary:hover {
    background: var(--blue-50) !important;
    border-color: var(--border-blue) !important;
    color: var(--blue-600) !important;
}

.btn-lg {
    padding: 0.75rem 2rem !important;
    font-size: 1rem !important;
    border-radius: var(--radius-md) !important;
}

.btn-sm {
    padding: 0.3rem 0.75rem !important;
    font-size: 0.8rem !important;
}

.btn-link {
    color: var(--blue-600) !important;
}

/* ============================================================
   FORMS
   ============================================================ */
.form-control,
.form-select {
    border: 1px solid var(--border-light) !important;
    border-radius: var(--radius-sm) !important;
    background: var(--bg-white) !important;
    color: var(--text-primary) !important;
    transition: border-color 0.2s ease, box-shadow 0.2s ease !important;
    padding: 0.6rem 0.9rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--blue-400) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12) !important;
    outline: none !important;
}

.form-control-lg {
    padding: 0.75rem 1rem !important;
    font-size: 0.95rem !important;
    border-radius: var(--radius-md) !important;
}

.form-label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.form-check-input:checked {
    background-color: var(--blue-600) !important;
    border-color: var(--blue-600) !important;
}

.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12) !important;
}

/* ============================================================
   TABLES
   ============================================================ */
.table {
    --bs-table-striped-bg: var(--blue-50);
    --bs-table-hover-bg: var(--blue-50);
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--border-light) !important;
    background: var(--blue-50);
}

.table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-light) !important;
    color: var(--text-primary);
    vertical-align: middle;
    font-size: 0.9rem;
}

.table tbody tr {
    transition: background-color 0.15s ease;
}

.table-hover tbody tr:hover {
    background-color: var(--blue-50) !important;
}

.table-responsive {
    border-radius: var(--radius-md);
    overflow: hidden;
}

/* ============================================================
   BADGES
   ============================================================ */
.badge {
    font-weight: 600;
    font-size: 0.72rem;
    letter-spacing: 0.02em;
    padding: 0.35em 0.65em;
    border-radius: 20px !important;
}

.bg-success {
    background: linear-gradient(135deg, #10b981, #059669) !important;
}

.bg-danger {
    background: linear-gradient(135deg, #f87171, #ef4444) !important;
}

.bg-warning {
    background: linear-gradient(135deg, #fbbf24, #f59e0b) !important;
    color: #1c1917 !important;
}

.bg-secondary {
    background: linear-gradient(135deg, #94a3b8, #64748b) !important;
}

.bg-info {
    background: var(--grad-primary) !important;
}

.bg-primary {
    background: var(--grad-primary) !important;
}

/* ============================================================
   ALERTS
   ============================================================ */
.alert {
    border: none !important;
    border-radius: var(--radius-md) !important;
    font-size: 0.9rem;
    border-left: 4px solid transparent !important;
}

.alert-success {
    background: rgba(16, 185, 129, 0.08) !important;
    border-left-color: #10b981 !important;
    color: #065f46 !important;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.08) !important;
    border-left-color: #ef4444 !important;
    color: #991b1b !important;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.08) !important;
    border-left-color: #f59e0b !important;
    color: #92400e !important;
}

.alert-info {
    background: rgba(14, 165, 233, 0.08) !important;
    border-left-color: var(--sky-500) !important;
    color: #0c4a6e !important;
}

/* ============================================================
   PROGRESS BARS
   ============================================================ */
.progress {
    background: var(--blue-100);
    border-radius: 20px;
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    border-radius: 20px;
    transition: width 0.6s ease;
}

.progress-bar.bg-success {
    background: linear-gradient(to right, #10b981, #059669) !important;
}

.progress-bar.bg-warning {
    background: linear-gradient(to right, #fbbf24, #f59e0b) !important;
}

.progress-bar.bg-danger {
    background: linear-gradient(to right, #f87171, #ef4444) !important;
}

/* ============================================================
   PAGE HEADERS
   ============================================================ */
h1 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.25;
}

h2 {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h3, h4, h5 {
    font-weight: 600;
    color: var(--text-primary);
}

h6 {
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
}

.text-muted {
    color: var(--text-muted) !important;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer-custom {
    background: var(--bg-white);
    border-top: 1px solid var(--border-light);
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-custom small {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.gradient-text {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blue-dot {
    width: 10px; height: 10px;
    background: var(--grad-primary);
    border-radius: 50%;
    display: inline-block;
}

.divider-blue {
    height: 3px;
    width: 48px;
    background: var(--grad-primary);
    border-radius: 2px;
    margin: 0.75rem 0 1.5rem;
}

/* Wrapper for container top spacing */
.page-wrapper {
    padding-top: 1.5rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .card-stat .display-4 {
        font-size: 2rem;
    }

    .btn-lg {
        padding: 0.65rem 1.5rem !important;
    }

    h1 {
        font-size: 1.5rem;
    }
}