/* Theme Color Variables */
:root {
    /* Default Theme - Deep Ocean */
    --color-primary: #31255a;
    --color-secondary: #8fe0ff;
    --color-tertiary: #75b4e3;
    --color-accent: #54416d;
    --color-dark: #2b235a;

    /* Computed colors for UI elements */
    --bg-gradient-start: var(--color-tertiary);
    --bg-gradient-mid: var(--color-secondary);
    --bg-gradient-end: var(--color-primary);
    --card-gradient-start: var(--color-accent);
    --card-gradient-end: var(--color-dark);
    --text-primary: #2c3e50;
    --text-accent: var(--color-primary);
    --text-light: #7f8c8d;
    --nav-active-start: var(--color-tertiary);
    --nav-active-end: var(--color-accent);
    --selector-border: var(--color-accent);
    --selector-hover: var(--color-tertiary);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    /* Theme-aware gradient background */
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.5s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

.location {
    font-size: 1.2rem;
    color: var(--text-accent);
    font-weight: 600;
}

.last-update {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Language Selector */
.language-selector {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.language-selector a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    text-decoration: none;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.language-selector a:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    border-color: var(--selector-border);
}

.language-selector a.active {
    border-color: var(--selector-border);
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    transform: scale(1.05);
}

/* Navigation */
.main-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid #ecf0f1;
}

.nav-link {
    padding: 10px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    color: var(--text-light);
}

.nav-link:hover {
    background: color-mix(in srgb, var(--selector-hover) 15%, transparent);
    color: var(--text-accent);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--nav-active-start) 0%, var(--nav-active-end) 100%);
    color: white;
    border-color: var(--nav-active-end);
}

/* Current Conditions */
.current-conditions {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.current-conditions h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.conditions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.condition-card {
    background: linear-gradient(135deg, var(--card-gradient-start) 0%, var(--card-gradient-end) 100%);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.condition-card:hover {
    transform: translateY(-5px);
}

.condition-card .icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.condition-card h3 {
    font-size: 1rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.condition-card .value {
    font-size: 1.8rem;
    font-weight: bold;
    margin-top: 5px;
}

.wind-direction {
    margin-top: 10px;
    font-size: 2rem;
}

/* Tide Section */
.tide-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.tide-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.tide-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.tide-item {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    color: white;
}

.tide-item .tide-type {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 5px;
}

.tide-item .tide-time {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 5px 0;
}

.tide-item .tide-height {
    font-size: 1rem;
    opacity: 0.9;
}

.tide-coef-mini {
    margin-top: 8px;
    padding: 4px 8px;
    border-radius: 5px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    display: inline-block;
}

/* Tide Coefficient */
.tide-coefficient {
    grid-column: 1 / -1;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
}

.tide-coefficient .coef-label {
    font-size: 0.9rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.tide-coefficient .coef-value {
    font-size: 3rem;
    font-weight: bold;
    margin: 10px 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.tide-coefficient .coef-category {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 8px;
    opacity: 0.95;
}

/* Buoy Section */
.buoy-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.buoy-section h2 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.buoy-info {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-bottom: 20px;
    font-style: italic;
}

.buoy-stats-container {
    margin-bottom: 30px;
}

.buoy-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.buoy-stat-card {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.buoy-stat-card:hover {
    transform: translateY(-5px);
}

.buoy-stat-card .stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.buoy-stat-card .stat-label {
    font-size: 0.9rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.buoy-stat-card .stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin-top: 5px;
}

.buoy-stat-card .stat-note {
    font-size: 0.75rem;
    margin-top: 8px;
    opacity: 0.8;
    font-style: italic;
}

.buoy-description {
    color: #5a6c7d;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 25px;
    padding: 15px;
    background: rgba(52, 152, 219, 0.05);
    border-left: 4px solid #3498db;
    border-radius: 5px;
}

.buoy-info-section {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 2px solid #ecf0f1;
}

.buoy-info-section h3 {
    color: #2c3e50;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.info-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    padding: 20px;
    border-left: 4px solid #3498db;
}

.info-card h4 {
    color: #2c3e50;
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.info-card p {
    color: #5a6c7d;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 8px;
}

.info-card ul {
    list-style: none;
    padding-left: 0;
}

.info-card ul li {
    color: #5a6c7d;
    font-size: 0.9rem;
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
}

.info-card ul li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #3498db;
    font-weight: bold;
}

.info-card a {
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
}

.info-card a:hover {
    text-decoration: underline;
}

.buoy-section .chart-wrapper {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.buoy-section .chart-wrapper h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
    text-align: center;
}

/* Charts Section */
.charts-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.charts-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
}

.chart-wrapper {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.chart-wrapper h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
    text-align: center;
}

.wind-chart-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 15px;
    padding: 10px;
}

.wind-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    border-radius: 10px;
    background: #f8f9fa;
    transition: transform 0.2s ease;
}

.wind-day:hover {
    transform: translateY(-3px);
    background: #e9ecef;
}

.wind-day .day-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: #7f8c8d;
    margin-bottom: 8px;
    text-align: center;
}

.wind-day .wind-arrow {
    font-size: 2rem;
    margin: 8px 0;
    transition: transform 0.3s ease;
}

.wind-day .wind-speed {
    font-size: 0.85rem;
    font-weight: bold;
    color: #2c3e50;
    margin-top: 5px;
}

.wind-day .wind-dir-label {
    font-size: 0.7rem;
    color: #95a5a6;
    margin-top: 2px;
}

/* Forecast Section */
.forecast-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.forecast-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.tab-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    background: #ecf0f1;
    color: #2c3e50;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: #bdc3c7;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--nav-active-start) 0%, var(--nav-active-end) 100%);
    color: white;
}

.forecast-view {
    display: none;
}

.forecast-view.active {
    display: block;
}

.forecast-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.forecast-card {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.forecast-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

/* Optimal surf conditions highlight */
.forecast-card.optimal-surf {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border: 2px solid #28a745;
    box-shadow: 0 5px 20px rgba(40, 167, 69, 0.3);
}

.forecast-card.optimal-surf:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.4);
}

.forecast-card .date {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #ecf0f1;
}

.forecast-detail {
    display: flex;
    align-items: center;
    margin: 10px 0;
    font-size: 0.95rem;
}

.forecast-detail .label {
    flex: 1;
    color: #7f8c8d;
}

.forecast-detail .detail-value {
    font-weight: 600;
    color: #2c3e50;
}

/* Easterly wind highlight */
.forecast-detail.easterly-wind {
    background: rgba(40, 167, 69, 0.15);
    padding: 8px;
    border-radius: 8px;
    border-left: 3px solid #28a745;
}

.forecast-detail.easterly-wind .label,
.forecast-detail.easterly-wind .detail-value {
    color: #28a745;
    font-weight: 700;
}

/* Forecast Coefficient Badge */
.forecast-coef-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    margin: 10px 0;
    color: white;
    font-weight: 600;
}

.forecast-coef-badge .coef-num {
    font-size: 1.3rem;
    font-weight: bold;
}

.forecast-coef-badge .coef-text {
    font-size: 0.75rem;
    opacity: 0.95;
}

/* Forecast Tides */
.forecast-tides {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #ecf0f1;
}

.tide-mini {
    font-size: 0.85rem;
    padding: 5px 0;
    color: #34495e;
    line-height: 1.5;
}

.tide-mini:first-child {
    margin-top: 5px;
}

/* Hourly Forecast */
.hourly-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
}

.hourly-card {
    background: white;
    border-radius: 12px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.hourly-card .hour {
    font-weight: bold;
    color: #667eea;
    margin-bottom: 10px;
}

.hourly-card .detail {
    font-size: 0.85rem;
    margin: 5px 0;
    color: #2c3e50;
}

/* Error Message */
.error-message {
    background: #e74c3c;
    color: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.error-message.hidden {
    display: none;
}

/* Loading State */
.loading {
    text-align: center;
    color: #7f8c8d;
    padding: 40px;
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 20px;
    text-align: center;
    color: #7f8c8d;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

footer a {
    color: var(--text-accent);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

footer p {
    margin: 5px 0;
}

/* Theme Selector */
.theme-selector {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.theme-selector-label {
    font-size: 0.85rem;
    opacity: 0.9;
    font-weight: 600;
}

.theme-selector select {
    padding: 8px 16px;
    border-radius: 20px;
    border: 2px solid var(--selector-border);
    background: white;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    min-width: 180px;
    text-align: center;
}

.theme-selector select:hover {
    background: color-mix(in srgb, var(--selector-hover) 10%, white);
    border-color: var(--selector-hover);
}

.theme-selector select:focus {
    border-color: var(--selector-hover);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--selector-hover) 20%, transparent);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    .conditions-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }

    .condition-card {
        padding: 20px;
    }

    .condition-card .icon {
        font-size: 2.5rem;
    }

    .condition-card .value {
        font-size: 1.5rem;
    }

    .forecast-grid {
        grid-template-columns: 1fr;
    }

    .hourly-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .current-conditions,
    .tide-section,
    .buoy-section,
    .charts-section,
    .forecast-section,
    header {
        padding: 20px;
    }

    .buoy-stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .charts-container {
        grid-template-columns: 1fr;
    }

    .wind-chart-container {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }

    .main-nav {
        flex-direction: column;
        gap: 10px;
    }

    .nav-link {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .location {
        font-size: 1rem;
    }

    .conditions-grid {
        grid-template-columns: 1fr;
    }

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

    .buoy-stats-grid {
        grid-template-columns: 1fr;
    }
}