/* Custom CSS Variables */
:root {
    --primary-color: #101820;
    --secondary-color: #fee715;
    --accent-color: #fee715;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --dark-color: #101820;
    --light-color: #f8fafc;
    --text-light: #ffffff;
    --text-dark: #101820;
    --gradient-blue: linear-gradient(135deg, #101820 0%, #fee715 100%);
    --gradient-cyan: linear-gradient(135deg, #fee715 0%, #101820 100%);
    --gradient-green: linear-gradient(135deg, #10b981 0%, #fee715 100%);
    --gradient-purple: linear-gradient(135deg, #fee715 0%, #101820 100%);
    --shadow-light: 0 4px 6px -1px rgba(16, 24, 32, 0.1);
    --shadow-medium: 0 10px 15px -3px rgba(16, 24, 32, 0.15);
    --shadow-heavy: 0 25px 50px -12px rgba(16, 24, 32, 0.25);
    --bg-overlay: rgba(16, 24, 32, 0.9);
}

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background: linear-gradient(135deg, #101820 0%, #2a2a2a 100%);
    min-height: 100vh;
}

/* Loader Styles */
.loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #101820 0%, #2a2a2a 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loader {
    text-align: center;
    color: var(--secondary-color);
}

.water-wave {
    width: 80px;
    height: 80px;
    border: 3px solid rgba(254, 231, 21, 0.3);
    border-top: 3px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loader-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--secondary-color);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Navigation Styles */
.navbar {
    backdrop-filter: blur(10px);
    background: var(--bg-overlay) !important;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    border-bottom: 2px solid var(--secondary-color);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--secondary-color) !important;
}

.nav-link {
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-light) !important;
}

.nav-link:hover {
    color: var(--secondary-color) !important;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    padding-top: 76px;
    min-height: 100vh;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, rgba(16, 24, 32, 0.9) 0%, rgba(42, 42, 42, 0.9) 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" style="stop-color:rgba(254,231,21,0.1)"/><stop offset="100%" style="stop-color:rgba(254,231,21,0)"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="300" cy="700" r="120" fill="url(%23a)"/></svg>') no-repeat;
    opacity: 0.5;
    z-index: -1;
}

.hero-section h1 {
    color: var(--secondary-color) !important;
}

.hero-section h2 {
    color: var(--text-light) !important;
}

.hero-section .lead {
    color: rgba(255, 255, 255, 0.8) !important;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: var(--secondary-color);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.floating-card {
    background: rgba(254, 231, 21, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(254, 231, 21, 0.3);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    animation: float 6s ease-in-out infinite;
}

.floating-card i {
    color: var(--secondary-color);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Data Cards */
.data-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
    height: 100%;
    border: 2px solid transparent;
}

.data-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--secondary-color);
}

.data-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
}

.gradient-blue::before { background: var(--gradient-blue); }
.gradient-cyan::before { background: var(--gradient-cyan); }
.gradient-green::before { background: var(--gradient-green); }
.gradient-purple::before { background: var(--gradient-purple); }

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.gradient-blue .card-icon { color: var(--primary-color); }
.gradient-cyan .card-icon { color: var(--secondary-color); }
.gradient-green .card-icon { color: var(--success-color); }
.gradient-purple .card-icon { color: var(--primary-color); }

.card-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.data-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.data-value small {
    font-size: 1rem;
    color: #6b7280;
    font-weight: 400;
}

.water-temps {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.temp-depth {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: rgba(16, 24, 32, 0.1);
    border-radius: 8px;
    font-size: 0.9rem;
    border: 1px solid rgba(254, 231, 21, 0.3);
}

.temp-depth small {
    font-weight: 600;
    color: var(--primary-color);
}

.card-trend {
    position: absolute;
    bottom: 0;
    right: 0;
    padding: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.6;
    color: var(--primary-color);
}

/* Section Headers */
.display-5, .display-4 {
    color: var(--secondary-color) !important;
}

.lead.text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

/* Last Update */
.last-update {
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background: rgba(254, 231, 21, 0.2);
    border: 1px solid rgba(254, 231, 21, 0.4);
    border-radius: 50px;
    display: inline-block;
    color: var(--text-light);
}

/* Quick Links */
.quick-links .btn {
    transition: all 0.3s ease;
    border-width: 2px;
    margin: 0.5rem;
}

.quick-links .btn-outline-primary {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.quick-links .btn-outline-primary:hover {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.quick-links .btn-outline-info {
    border-color: var(--info-color);
    color: var(--info-color);
}

.quick-links .btn-outline-info:hover {
    background-color: var(--info-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.quick-links .btn-outline-success {
    border-color: var(--success-color);
    color: var(--success-color);
}

.quick-links .btn-outline-success:hover {
    background-color: var(--success-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.quick-links .btn-outline-warning {
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.quick-links .btn-outline-warning:hover {
    background-color: var(--warning-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* Chart Pages */
.chart-page {
    background: linear-gradient(135deg, #101820 0%, #2a2a2a 100%);
    min-height: 100vh;
}

.back-button-container {
    margin: 2rem 0;
}

.back-button-container .btn {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--primary-color);
    font-weight: 600;
}

.back-button-container .btn:hover {
    background-color: var(--primary-color);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    transform: translateY(-2px);
}

.page-header {
    margin: 3rem 0;
    color: var(--text-light);
}

.page-icon {
    font-size: 4rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.page-header h1 {
    color: var(--secondary-color) !important;
}

.page-header .lead {
    color: rgba(255, 255, 255, 0.8) !important;
}

.chart-controls {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    margin-bottom: 2rem;
    border: 1px solid rgba(254, 231, 21, 0.3);
}

.chart-controls h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.chart-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    position: relative;
    min-height: 400px;
    border: 1px solid rgba(254, 231, 21, 0.3);
}

.chart-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

/* Stats Cards */
.stat-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(254, 231, 21, 0.2);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--secondary-color);
}

.stat-icon {
    font-size: 2.5rem;
    margin-right: 1rem;
}

.stat-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: #6b7280;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Depth Cards (Water Temperature Page) */
.depth-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    height: 100%;
    border: 1px solid rgba(254, 231, 21, 0.2);
}

.depth-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--secondary-color);
}

.depth-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f1f5f9;
}

.depth-header i {
    font-size: 1.5rem;
    margin-right: 0.5rem;
}

.depth-header h4 {
    margin: 0;
    font-weight: 600;
    color: var(--primary-color);
}

.surface .depth-header i { color: var(--info-color); }
.middle .depth-header i { color: var(--warning-color); }
.bottom .depth-header i { color: var(--danger-color); }

.depth-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: rgba(16, 24, 32, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(254, 231, 21, 0.2);
}

.stat-item .label {
    font-weight: 500;
    color: #6b7280;
}

.stat-item .value {
    font-weight: 700;
    color: var(--primary-color);
}

/* Footer */
footer {
    margin-top: auto;
    background: var(--primary-color) !important;
    border-top: 2px solid var(--secondary-color);
}

footer h5 {
    color: var(--secondary-color);
}

footer p {
    color: var(--text-light);
}

/* Form Controls */
.form-select, .form-control {
    border: 2px solid rgba(254, 231, 21, 0.3);
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
}

.form-select:focus, .form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(254, 231, 21, 0.25);
}

/* Alert Styles */
.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

/* Error Page Styles */
.error-page {
    padding: 3rem 0;
    color: var(--text-light);
}

.error-page h1 {
    color: var(--secondary-color);
}

.error-page h2 {
    color: var(--text-light);
}

.error-page .lead {
    color: rgba(255, 255, 255, 0.8);
}

.error-icon {
    margin-bottom: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section .row {
        text-align: center;
    }
    
    .data-value {
        font-size: 2rem;
    }
    
    .page-header {
        margin: 2rem 0;
    }
    
    .page-icon {
        font-size: 3rem;
    }
    
    .chart-container {
        padding: 1rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
    
    .quick-links .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .data-card {
        margin-bottom: 1rem;
    }
    
    .temp-depth {
        font-size: 0.8rem;
    }
    
    .depth-card {
        margin-bottom: 1rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-color);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(254, 231, 21, 0.8);
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.pulse-animation {
    animation: pulse 2s infinite;
}

/* Utility Classes */
.text-gradient {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-glass {
    background: rgba(254, 231, 21, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(254, 231, 21, 0.2);
}

.shadow-custom {
    box-shadow: var(--shadow-medium);
}

.border-gradient {
    border: 2px solid var(--secondary-color);
}

/* Text Color Overrides */
.text-primary {
    color: var(--secondary-color) !important;
}

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

.text-muted {
    color: rgba(255, 255, 255, 0.7) !important;
}

/* Button Overrides */
.btn-primary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

/* Navbar Dark Theme */
.navbar-dark .navbar-nav .nav-link {
    color: var(--text-light) !important;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: var(--secondary-color) !important;
}

/* Chart specific adjustments */
canvas {
    background: rgba(255, 255, 255, 0.98) !important;
}