/**
 * ATSEP Toolbox Styles
 * 
 * Design system for the ATSEP aviation toolbox application.
 * Uses CSS custom properties for consistent theming.
 */

* {
    box-sizing: border-box;
}

/* === Design Tokens === */
:root {
    /* Gray scale - dark theme */
    --color-gray-900: #1a202c;
    --color-gray-800: #2d3748;
    --color-gray-700: #4a5568;
    --color-gray-600: #718096;
    --color-gray-500: #a0aec0;
    --color-gray-400: #cbd5e0;
    --color-gray-300: #e2e8f0;

    /* Accent colors */
    --color-blue-500: #63b3ed;
    --color-blue-600: #4299e1;
    --color-green-500: #48bb78;
    --color-red-500: #f56565;
    --color-red-400: #fc8181;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.6rem;
    --radius-lg: 0.8rem;
    --radius-xl: 1.5rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

/* === Base Styles === */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: var(--spacing-md);
}

/* === Accessibility === */

/* Visually hidden but accessible to screen readers */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Show on focus for keyboard navigation */
.visually-hidden.focus-visible:focus {
    position: static;
    width: auto;
    height: auto;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background: var(--color-blue-500);
    color: white;
    text-decoration: none;
    font-weight: 600;
    z-index: 1000;
}

/* Hidden utility class */
.hidden {
    display: none !important;
}

/* === Main Card === */
.calculator-card {
    background-color: var(--color-gray-800);
    padding: 2.2rem;
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    width: 480px;
    max-width: 100%;
    border: 1px solid var(--color-gray-700);
    position: relative;
    min-height: 650px;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* === Tab Navigation === */
.tab-nav {
    display: flex;
    flex-wrap: wrap;
    background-color: var(--color-gray-900);
    padding: 6px;
    border-radius: 0.85rem;
    margin-bottom: var(--spacing-xl);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--color-gray-400);
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--color-gray-300);
}

.tab-btn:focus {
    outline: 2px solid var(--color-blue-500);
    outline-offset: 2px;
}

.tab-btn.active {
    background-color: var(--color-gray-700);
    color: white;
}

.tab-panel {
    display: none;
    flex-grow: 1;
    flex-direction: column;
    overflow-x: hidden;
}

.tab-panel.active {
    display: flex;
    animation: fadeIn var(--transition-medium);
}

/* === Form Elements === */
.input-group {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.mb-half {
    margin-bottom: var(--spacing-sm);
}

/* Fixed height for coordinate input containers to prevent card resizing */
#r_origin_inputs,
#r_dest_inputs,
#d_start_inputs,
#mag_coord_inputs {
    min-height: 7.5rem;
}


.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-gray-400);
}

.small-label {
    display: block;
    margin-bottom: 4px;
    opacity: 0.7;
    font-size: 0.85rem;
}

.clean-select {
    color: var(--color-blue-500);
    background: none;
    border: none;
    font-weight: bold;
    cursor: pointer;
    font-size: 0.9rem;
}

.clean-select:focus {
    outline: 2px solid var(--color-blue-500);
    outline-offset: 2px;
}

.coord-row {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: 0.6rem;
    width: 100%;
    min-height: 3rem;
    align-items: center;
    flex-wrap: wrap;
}

.hem-select {
    width: 65px;
    flex-shrink: 0;
    background-color: var(--color-gray-900);
    color: var(--color-blue-500);
    font-weight: 700;
    border: 1px solid var(--color-gray-700);
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: center;
}

.hem-select:focus {
    outline: 2px solid var(--color-blue-500);
    outline-offset: 2px;
}

.num-input,
.input-field {
    flex: 1;
    min-width: 0;
    background-color: var(--color-gray-700);
    color: white;
    border: 1px solid var(--color-gray-700);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.num-input:focus,
.input-field:focus {
    outline: none;
    border-color: var(--color-blue-500);
    box-shadow: 0 0 0 3px rgba(99, 179, 237, 0.2);
}

.num-input.invalid,
.input-field.invalid {
    border-color: var(--color-red-500);
    background-color: rgba(245, 101, 101, 0.1);
}

/* === Buttons === */
.calculate-btn {
    background-color: var(--color-blue-500);
    color: white;
    padding: 1.2rem;
    border-radius: var(--radius-lg);
    font-weight: 700;
    width: 100%;
    border: none;
    cursor: pointer;
    margin-top: auto;
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
    transition: background-color var(--transition-fast);
}

.calculate-btn:hover {
    background-color: var(--color-blue-600);
}

.calculate-btn:focus {
    outline: 2px solid var(--color-blue-500);
    outline-offset: 2px;
}

/* === Copy to Clipboard Feedback === */
.copy-target {
    transition: background-color var(--transition-fast);
    -webkit-user-select: none;
    user-select: none;
    touch-action: pan-y;
}

.flash-copied {
    background-color: rgba(99, 179, 237, 0.4) !important;
    transition: background-color 0.1s ease !important;
}

/* === Swap Button === */
.swap-container {
    text-align: center;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 10;
    width: 100%;
}

.swap-icon-btn {
    background: none;
    border: none;
    color: var(--color-gray-500);
    font-size: 1.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1;
    padding: 0.2rem 1rem;
    border-radius: var(--radius-sm);
}

.swap-icon-btn:hover {
    color: var(--color-blue-500);
    background-color: var(--color-gray-700);
}

.swap-icon-btn:focus {
    outline: 2px solid var(--color-blue-500);
    outline-offset: 2px;
}

/* === Results === */
.result-container {
    position: relative;
    margin-top: var(--spacing-sm);
}

.result-box {
    background-color: var(--color-gray-900);
    padding: var(--spacing-lg) 3rem;
    border-radius: var(--radius-lg);
    text-align: center;
    font-family: ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
    font-weight: 700;
    font-size: 1.1rem;
    border: 1px solid var(--color-blue-500);
    line-height: 1.6;
    min-height: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.result-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.result-row .label {
    opacity: 0.7;
    font-weight: normal;
}

.result-row .val {
    color: var(--color-green-500);
    font-weight: bold;
}

.result-positive,
.result-success {
    color: var(--color-green-500);
}

.result-negative {
    color: var(--color-red-400);
}

.result-error {
    color: var(--color-red-500);
    font-weight: bold;
}

.warning-text {
    color: var(--color-red-400);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.result-box[data-warning="true"] {
    border: 2px solid var(--color-blue-500);
    background-color: rgba(99, 179, 237, 0.08);
}

.coord-val {
    display: inline-block;
    white-space: nowrap;
    margin: 0 var(--spacing-sm);
}

/* === Decorations === */
.ducky-mascot {
    position: absolute;
    bottom: 10px;
    left: 24px;
    font-size: 1.8rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease-in;
}

.ducky-mascot.visible {
    opacity: 0.9;
    pointer-events: auto;
    cursor: help;
}

/* === Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === Utility Classes === */
.text-3xl {
    font-size: 1.875rem;
}

.font-bold {
    font-weight: 700;
}

.font-medium {
    font-weight: 500;
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.text-sm {
    font-size: 0.875rem;
}

.text-gray-400 {
    color: var(--color-gray-400);
}

.block {
    display: block;
}

.flex {
    display: flex;
}

.flex-1 {
    flex: 1;
}

.items-center {
    align-items: center;
}

.space-x-2> :not([hidden])~ :not([hidden]) {
    margin-left: var(--spacing-sm);
}

.flex-grow {
    flex-grow: 1;
}

.w-auto {
    width: auto;
}

.w-full {
    width: 100%;
}

.mt-6 {
    margin-top: var(--spacing-lg);
}

.text-left {
    text-align: left;
}

/* === Responsive Helpers === */
.input-row-responsive {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.input-row-responsive>div {
    min-width: 140px;
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
    .tab-panel.active {
        animation: none;
    }

    .tab-btn,
    .num-input,
    .input-field,
    .calculate-btn,
    .swap-icon-btn,
    .hem-select,
    .clean-select,
    .ducky-mascot {
        transition: none;
    }

    @keyframes fadeIn {
        from {
            opacity: 1;
        }

        to {
            opacity: 1;
        }
    }
}

/* === High Contrast Mode === */
@media (prefers-contrast: high) {
    .result-box {
        border-width: 2px;
    }

    .num-input:focus,
    .input-field:focus {
        border-width: 2px;
    }

    .tab-btn:focus,
    .calculate-btn:focus,
    .swap-icon-btn:focus {
        outline-width: 3px;
    }
}

/* === Print Styles === */
@media print {
    body {
        background-color: white;
        color: black;
        padding: 0;
    }

    .calculator-card {
        box-shadow: none;
        border: 1px solid #333;
        max-width: 100%;
        min-height: auto;
        padding: 1rem;
    }

    .tab-nav,
    .calculate-btn,
    .swap-icon-btn,
    .ducky-mascot,
    .visually-hidden {
        display: none !important;
    }

    .tab-panel {
        display: block !important;
        page-break-inside: avoid;
        margin-bottom: 1rem;
        border-bottom: 1px solid #ccc;
        padding-bottom: 1rem;
    }

    .result-box {
        border: 1px solid #333;
        background-color: #f5f5f5;
        color: black;
    }

    .result-positive,
    .result-success {
        color: #006600;
    }

    .result-negative,
    .result-error,
    .warning-text {
        color: #cc0000;
    }

    .app-title {
        color: black;
        border-bottom: 2px solid #333;
        padding-bottom: 0.5rem;
    }

    .input-group,
    .coord-row {
        display: none;
    }
}

/* === Mobile Responsiveness === */
@media (max-width: 500px) {
    body {
        padding: 1rem;
        /* Guarantee card edges are visible */
    }

    .calculator-card {
        padding: 2.2rem;
        /* Exact match to Tab 1 / Default desktop style */
        min-height: auto;
        border-radius: var(--radius-xl);
        width: 100%;
        max-width: 100%;
        /* Prevent width changes when switching tabs or coordinate formats */
        box-sizing: border-box;
    }

    .app-title {
        font-size: 1.4rem;
        margin-bottom: var(--spacing-md);
        line-height: 1.2;
        overflow-wrap: break-word;
        /* Ensure titles wrap */
    }

    .label-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .tab-nav {
        margin-bottom: var(--spacing-lg);
        padding: 4px;
    }

    .tab-btn {
        padding: var(--spacing-md) var(--spacing-xs);
        font-size: 0.75rem;
    }

    .coord-row {
        gap: 6px;
        flex-wrap: wrap;
        /* CRITICAL: Wrap items if they don't fit */
        width: 100%;
        /* Prevent parent card from resizing */
    }

    /* Ensure coordinate input containers don't cause card width changes */
    #r_origin_inputs,
    #r_dest_inputs,
    #d_start_inputs,
    #mag_coord_inputs {
        width: 100%;
        overflow-x: hidden;
    }

    .num-input,
    .input-field {
        padding: 0.6rem 0.4rem;
        /* Compact inputs to help them stay on one line if possible */
        font-size: 0.9rem;
        min-width: 60px;
        /* Prevent shrinking too much */
    }

    .hem-select {
        width: 55px;
        font-size: 0.85rem;
        padding: 0.5rem 0;
    }

    .calculate-btn {
        padding: 1rem;
        margin-top: 1.5rem;
    }

    .result-box {
        padding: var(--spacing-md);
        font-size: 1rem;
    }

    .swap-icon-btn {
        font-size: 1.5rem;
        padding: 0.1rem 0.5rem;
    }
}

/* === Update Banner === */
.update-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(45, 55, 72, 0.85); /* Slate with transparency */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 2px solid var(--color-blue-500);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    animation: slideDown 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.update-banner-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.update-banner-icon {
    font-size: 1.2rem;
    animation: pulse 2s infinite;
}

.update-banner-text {
    font-weight: 600;
    color: white;
    font-size: 0.95rem;
}

.update-banner-btn {
    background-color: var(--color-blue-500);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.update-banner-btn:hover {
    background-color: var(--color-blue-600);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 179, 237, 0.3);
}

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

@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
    100% { opacity: 1; transform: scale(1); }
}

@media (max-width: 500px) {
    .update-banner-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .update-banner-text {
        font-size: 0.85rem;
    }
    
    .update-banner-btn {
        width: 100%;
        padding: 0.6rem;
    }
}