/* JD Calculator - Common Styles */
/* Theme variables */
:root {
    /* Colors */
    --bg-color: #f5f5f5;
    --bg-secondary: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border: #e0e0e0;
    --accent-hover: #1a1a1a;
    --alert-color: #e67e22;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --shadow: 0 2px 8px #0000001A;
    --shadow-sm: 0 2px 4px #00000033;
    --danger-color-transparent: #EF44441A;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Courier New', monospace;
    
    /* Dimensions */
    --border-thin: 1px;
    --border-width: 2px;
    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --space-xs: 9px;
    --space-sm: 12px;
    --space-md: 15px;
    --space-lg: 20px;
    --space-xl: 30px;
    --space-2xl: 40px;
    --text-xs: 0.75rem;
    --text-sm: 0.85rem;
    --text-base: 1rem;
    --text-lg: 1.5rem;
    --text-xl: 2rem;
    --container-max: 1000px;
    --breakpoint-md: 768px;
    --breakpoint-sm: 480px;
}

[data-theme="dark"] {
    /* Colors */
    --bg-color: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #aaaaaa;
    --border: #404040;
    --accent-hover: #f5f5f5;
    --alert-color: #f39c12;
    --success-color: #4ade80;
    --danger-color: #f87171;
    --shadow: 0 2px 8px #0000004D;
    --shadow-sm: 0 2px 4px #00000066;
    --danger-color-transparent: #F871711A;
    
    /* Dimensions (same as light) */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    padding: var(--space-lg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
}

/* ===== UTILITY CLASSES ===== */

/* Card/Panel containers */
.card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.card-inner {
    background-color: var(--bg-color);
    border: var(--border-width) solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

/* Form elements - Labels */
.form-label {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    display: block;
}

/* Form elements - Inputs */
.form-input {
    padding: var(--space-sm) 15px;
    border: var(--border-width) solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--text-base);
    width: 100%;
    transition: border-color 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--text-primary);
}

.form-input:disabled {
    background-color: var(--border);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.form-input.mono {
    font-family: var(--font-mono);
    text-align: center;
}

/* Form groups */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-row {
    display: flex;
    gap: var(--space-xl);
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

/* Buttons */
.btn {
    background-color: var(--text-primary);
    color: var(--bg-color);
    border: none;
    padding: var(--space-sm) 30px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    background-color: var(--accent-hover);
}

.btn:active {
    transform: scale(0.98);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--text-primary);
    color: var(--bg-color);
}

.btn-small {
    padding: var(--space-xs) 16px;
    font-size: var(--text-sm);
}

/* Result display boxes */
.result-box {
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    text-align: center;
}

.result-value {
    font-size: var(--text-xl);
    font-weight: 700;
    font-family: var(--font-mono);
}

.result-unit {
    font-size: var(--text-base);
    opacity: 0.8;
}

.result-label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.8;
    margin-bottom: var(--space-sm);
}

/* Grid layouts */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

/* Tables */
.table-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.table-header {
    display: grid;
    gap: var(--space-xs);
    padding: var(--space-md) 20px;
    background-color: var(--text-primary);
    color: var(--bg-color);
    font-weight: 600;
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table-row {
    display: grid;
    gap: var(--space-xs);
    padding: var(--space-sm) 20px;
    border-bottom: var(--border-thin) solid var(--border);
    align-items: center;
    transition: background-color 0.2s ease;
}

.table-row:last-child {
    border-bottom: none;
}

.table-row:hover {
    background-color: var(--bg-secondary);
}

/* Select dropdown */
.form-select {
    padding: var(--space-sm) 15px;
    border: var(--border-width) solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--text-base);
    min-width: 180px;
    transition: border-color 0.3s ease;
}

.form-select:focus {
    outline: none;
    border-color: var(--text-primary);
}

/* Monospace text */
.mono {
    font-family: var(--font-mono);
}

/* Unit label */
.unit-label {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    text-align: center;
    margin-top: 2px;
}

/* Section titles */
.section-title {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
    font-weight: 600;
}

/* ===== HEADER STYLES ===== */

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: var(--border-width) solid var(--border);
    gap: var(--space-md);
    flex-wrap: nowrap;
}

.logo-title {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex: 1;
    min-width: 0;
}

.logo-title > div {
    min-width: 0;
}

.logo-title a {
    display: flex;
    text-decoration: none;
}

.logo {
    width: auto;
    height: auto;
    max-width: 120px;
    max-height: 120px;
    object-fit: contain;
    transform: scale(1);
    transform-origin: left center;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

h1 {
    font-size: clamp(1rem, 2.5vw, 1.8rem);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.subtitle {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex-shrink: 0;
}

.toggle-btn {
    width: 60px;
    height: 28px;
    background-color: var(--border);
    border-radius: 14px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s ease;
    border: none;
}

.toggle-btn::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='5'/%3E%3Cline x1='12' y1='1' x2='12' y2='3'/%3E%3Cline x1='12' y1='21' x2='12' y2='23'/%3E%3Cline x1='4.22' y1='4.22' x2='5.64' y2='5.64'/%3E%3Cline x1='18.36' y1='18.36' x2='19.78' y2='19.78'/%3E%3Cline x1='1' y1='12' x2='3' y2='12'/%3E%3Cline x1='21' y1='12' x2='23' y2='12'/%3E%3Cline x1='4.22' y1='19.78' x2='5.64' y2='18.36'/%3E%3Cline x1='18.36' y1='5.64' x2='19.78' y2='4.22'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.toggle-btn::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.3;
    transition: opacity 0.3s ease;
}

.toggle-btn .slider {
    position: absolute;
    width: 22px;
    height: 22px;
    background-color: var(--bg-secondary);
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 4px #00000033;
    z-index: 1;
}

.toggle-btn[data-active="true"] {
    background-color: var(--text-primary);
}

.toggle-btn[data-active="true"]::before {
    opacity: 0.3;
}

.toggle-btn[data-active="true"]::after {
    opacity: 1;
}

.toggle-btn[data-active="true"] .slider {
    transform: translateX(32px);
}

/* Legacy button styles - for backward compatibility */
.reset-btn {
    background-color: var(--text-primary);
    color: var(--bg-color);
    border: none;
    padding: var(--space-sm) 30px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.reset-btn:hover {
    background-color: var(--accent-hover);
}

.reset-btn:active {
    transform: scale(0.98);
}

/* Legacy form elements - for backward compatibility */
select, input[type="number"] {
    padding: var(--space-sm) 15px;
    border: var(--border-width) solid var(--border);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--text-base);
    transition: border-color 0.3s ease;
}

select:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--text-primary);
}

/* ===== RESPONSIVE STYLES ===== */

@media (max-width: var(--breakpoint-md)) {
    header {
        gap: var(--space-xs);
    }

    .logo-title {
        gap: var(--space-xs);
    }

    .logo {
        max-width: 90px;
        max-height: 90px;
    }

    h1 {
        font-size: clamp(0.9rem, 2vw, 1.5rem);
    }

    .subtitle {
        font-size: 0.6rem;
    }

    /* Responsive utility classes */
    .form-row {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .grid-2 {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }

    .result-value {
        font-size: var(--text-xl);
    }

    .card {
        padding: var(--space-lg);
    }

    .card-inner {
        padding: var(--space-md);
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--space-md);
    }

    header {
        gap: var(--space-xs);
    }

    .logo-title {
        gap: var(--space-xs);
    }

    .logo {
        max-width: 70px;
        max-height: 70px;
    }

    h1 {
        font-size: var(--text-sm);
        letter-spacing: 1px;
    }

    .subtitle {
        font-size: 0.55rem;
    }

    .toggle-btn {
        width: 50px;
        height: 24px;
    }

    .toggle-btn .slider {
        width: 18px;
        height: 18px;
    }

    .toggle-btn[data-active="true"] .slider {
        transform: translateX(26px);
    }

    .form-row {
        gap: var(--space-md);
    }

    .grid-4 {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }

    .result-value {
        font-size: var(--text-lg);
    }

    .card {
        padding: var(--space-md);
    }

    .form-input, .form-select {
        padding: var(--space-xs) 12px;
        font-size: 0.95rem;
    }
}

/* ===== COMMON COMPONENTS ===== */

/* Tab System */
.tabs-container {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    gap: var(--space-xs);
}

.tab-btn {
    padding: var(--space-sm) 30px;
    border: var(--border-width) solid var(--border);
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 50px;
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.tab-btn.active {
    background-color: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-color);
}



/* Error Message */
.error-message {
    color: var(--danger-color);
    font-size: var(--text-sm);
    margin: 15px 0;
    padding: var(--space-sm) 16px;
    background-color: var(--danger-color-transparent);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--danger-color);
}

/* History List */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.history-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: var(--space-md);
    align-items: center;
    padding: 14px 18px;
    background-color: var(--bg-color);
    border-radius: var(--radius-md);
    border: var(--border-thin) solid var(--border);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    transition: border-color 0.2s;
}

.history-item:hover {
    border-color: var(--text-primary);
}

.history-coords {
    color: var(--text-secondary);
    word-break: break-all;
}

.history-result {
    color: var(--text-primary);
    font-weight: 700;
    white-space: nowrap;
}

.history-bearing {
    color: var(--text-primary);
    white-space: nowrap;
}

/* Legend System */
.legend {
    background-color: var(--bg-color);
    border: var(--border-thin) solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: 20px;
}

.legend-header {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: var(--border-thin) solid var(--border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
    font-size: var(--text-sm);
}

/* Tool/Link Grid */
.tools-grid,
.links-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: 40px;
}

/* Tool Card */
.tool-card,
.link-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 30px;
    background-color: var(--bg-secondary);
    border: var(--border-width) solid var(--border);
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    cursor: pointer;
}

.tool-card:hover,
.link-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px var(--shadow-sm);
    border-color: var(--text-primary);
}

.tool-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.tool-card .arrow,
.link-arrow {
    margin-top: 20px;
    font-size: var(--text-lg);
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.tool-card:hover .arrow,
.link-item:hover .link-arrow {
    transform: translateX(5px);
}

/* Link Category Card */
.link-category {
    background-color: var(--bg-color);
    border: var(--border-width) solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.category-title {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: var(--border-thin) solid var(--border);
}

/* Config Panel */
.config-panel {
    background-color: var(--bg-color);
    border: var(--border-thin) solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: 20px;
}

.config-toggle {
    width: 100%;
    padding: var(--space-md) 20px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.config-row {
    display: grid;
    grid-template-columns: 100px 80px 80px 80px 80px auto;
    gap: var(--space-xs);
    align-items: center;
    padding: var(--space-xs) 0;
    border-bottom: var(--border-thin) solid var(--border);
}

/* Converter Layout */
.converter-layout {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-lg);
    align-items: end;
}

.swap-btn {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    border: 2px solid var(--text-primary);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    margin-bottom: var(--space-sm);
}

.swap-btn:hover {
    background-color: var(--text-primary);
    color: var(--bg-color);
    transform: rotate(180deg);
}

/* Quick Reference Grid */
.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-xs);
    margin-top: 15px;
}

/* Loading & Empty States */
.loading-state,
.empty-history {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Info Section */
.info-section {
    background-color: var(--bg-color);
    border: var(--border-thin) solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-top: 20px;
}

.info-block {
    margin-bottom: var(--space-md);
}

.info-block:last-child {
    margin-bottom: 0;
}

/* Result Status Variants */
.result-box.success {
    background-color: var(--success-color);
}

.result-box.danger {
    background-color: var(--danger-color);
}

/* UV Index Colors */
.uv-low { color: var(--success-color); }
.uv-moderate { color: var(--alert-color); }
.uv-high { color: var(--alert-color); }
.uv-very-high { color: var(--danger-color); }

/* Formula Display */
.formula-note {
    background-color: var(--bg-color);
    border-left: 4px solid var(--text-primary);
    padding: var(--space-md) 20px;
    margin-top: 20px;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
}

/* Intro Section */
.intro {
    text-align: center;
    margin: 40px 0;
    padding: var(--space-lg);
}

.intro h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.intro p {
    font-size: var(--text-base);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* GitHub Section */
.github-section {
    margin-top: 60px;
    text-align: center;
}

.github-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    transition: color 0.3s ease, transform 0.3s ease;
}

.github-link:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.github-link svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
}