/* ============================================
   EXPOSR - Styles
   Modern Apple-Inspired Dark Theme
   ============================================ */

:root {
    /* Colors - Apple Dark Mode Palette */
    --color-bg-primary: #000000;
    --color-bg-secondary: #1c1c1e;
    --color-bg-tertiary: #2c2c2e;
    --color-bg-quaternary: #3a3a3c;

    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1a6;
    --color-text-tertiary: #8e8e93;

    --color-accent-primary: #0a84ff;
    --color-accent-secondary: #5ac8fa;
    --color-accent-success: #34c759;
    --color-accent-warning: #ff9500;
    --color-accent-error: #ff3b30;

    --color-border: #424245;
    --color-shadow: rgba(0, 0, 0, 0.3);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', system-ui, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 32px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.4);
    --shadow-glass: 0 4px 30px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

/* Light Mode Support */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg-primary: #ffffff;
        --color-bg-secondary: #f7f7f7;
        --color-bg-tertiary: #f0f0f0;
        --color-bg-quaternary: #e5e5e5;

        --color-text-primary: #000000;
        --color-text-secondary: #6c6c70;
        --color-text-tertiary: #8e8e93;

        --color-border: #d5d5d7;
        --color-shadow: rgba(0, 0, 0, 0.1);
    }
}

/* ============================================
   Global Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   App Container
   ============================================ */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

/* ============================================
   Header
   ============================================ */

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.app-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.app-icon {
    font-size: 28px;
    display: inline-block;
}

.app-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 400;
}

.header-nav {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    background: var(--color-bg-quaternary);
    transform: scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    padding: var(--spacing-3xl);
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   Panels
   ============================================ */

.panel {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.panel:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
}

.panel-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

/* Panel Input */
.panel-input {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Panel Output */
.panel-output {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.panel-reverse {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
}

.panel-favorites {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
}

.section-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Input Styles
   ============================================ */

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.input-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    display: block;
}

.unit-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 400;
    display: block;
    margin-top: 2px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-field,
select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.input-field:focus,
select:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    background: var(--color-bg-quaternary);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.1);
}

.input-field::placeholder {
    color: var(--color-text-tertiary);
}

.input-unit {
    position: absolute;
    right: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    pointer-events: none;
}

/* Filter Button Grid */
.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.filter-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.filter-btn:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-quaternary);
}

.filter-btn.active {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    border: none;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-accent-secondary) 100%);
    color: white;
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(10, 132, 255, 0.4);
}

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

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    width: 100%;
}

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

.btn-small {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    background: var(--color-accent-primary);
    color: white;
}

.btn-small:hover {
    opacity: 0.9;
}

.btn-danger {
    background: var(--color-accent-error);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.btn-danger:hover {
    opacity: 0.9;
}

/* ============================================
   Result Display
   ============================================ */

.result-display {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.result-item.original {
    border-color: rgba(90, 200, 250, 0.3);
}

.result-item.filtered {
    border-color: rgba(52, 199, 89, 0.3);
}

.result-item:hover {
    transform: translateY(-2px);
    border-color: var(--color-accent-primary);
}

.result-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.result-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    font-variant-numeric: tabular-nums;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

.result-arrow {
    font-size: 24px;
    color: var(--color-accent-primary);
    font-weight: 300;
}

/* Details Card */
.details-card {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.details-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-lg);
}

.details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.detail-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.detail-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-accent-primary);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

/* Countdown Card */
.countdown-card {
    background: linear-gradient(135deg, rgba(10, 132, 255, 0.1) 0%, rgba(52, 199, 89, 0.1) 100%);
    border: 1px solid rgba(10, 132, 255, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
}

.countdown-display {
    font-size: 72px;
    font-weight: 700;
    color: var(--color-accent-primary);
    font-variant-numeric: tabular-nums;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.countdown-number,
.countdown-unit {
    display: inline-block;
}

.countdown-unit {
    font-size: 32px;
    color: var(--color-text-secondary);
    margin-left: var(--spacing-md);
}

.countdown-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* ============================================
   Reverse Calculation
   ============================================ */

.section-reverse {
    padding: 0 var(--spacing-3xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.reverse-result {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-accent-success);
    margin-top: var(--spacing-lg);
    animation: slideDown var(--transition-base);
}

.reverse-result.hidden {
    display: none;
}

.reverse-explanation {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
    line-height: 1.6;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Charts Section
   ============================================ */

.section-charts {
    padding: var(--spacing-3xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.charts-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.chart-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.chart-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.chart-wrapper {
    position: relative;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas {
    max-height: 100% !important;
}

/* ============================================
   Favorites/Presets
   ============================================ */

.section-favorites {
    padding: var(--spacing-3xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.preset-input-row {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.preset-input-row .input-field {
    flex: 1;
}

.presets-list {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.preset-card {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
    transition: all var(--transition-base);
}

.preset-card:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-quaternary);
}

.preset-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.preset-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
}

.preset-details {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.preset-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-load {
    background: var(--color-accent-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 600;
}

.btn-load:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
}

/* ============================================
   Footer
   ============================================ */

.app-footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-2xl) var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.footer-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--color-accent-primary);
}

.ad-placeholder {
    max-width: 1400px;
    margin: var(--spacing-xl) auto 0;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.ad-placeholder::before {
    content: "[Ads Placeholder - Monetization Ready]";
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: var(--spacing-lg);
    }

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

    .input-row {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    .header-nav {
        align-self: flex-end;
    }

    .app-title {
        font-size: var(--font-size-xl);
    }

    .panel {
        padding: var(--spacing-lg);
    }

    .main-content {
        gap: var(--spacing-xl);
        padding: var(--spacing-lg);
    }

    .section-charts,
    .section-reverse,
    .section-favorites {
        padding: var(--spacing-lg);
    }

    .result-display {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .result-arrow {
        display: none;
    }

    .countdown-display {
        font-size: 48px;
    }

    .countdown-unit {
        font-size: 24px;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-grid {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    }

    .countdown-display {
        font-size: 56px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 12px;
        --spacing-xl: 16px;
        --spacing-2xl: 20px;
        --spacing-3xl: 24px;
    }

    .app-header {
        padding: var(--spacing-lg);
    }

    .app-title {
        font-size: var(--font-size-lg);
    }

    .app-icon {
        font-size: 24px;
    }

    .panel {
        padding: var(--spacing-lg);
    }

    .main-content,
    .section-charts,
    .section-reverse,
    .section-favorites {
        padding: var(--spacing-lg);
        gap: var(--spacing-lg);
    }

    .countdown-display {
        font-size: 44px;
    }

    .countdown-unit {
        font-size: 20px;
    }

    .detail-value {
        font-size: var(--font-size-base);
    }

    .preset-card {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .preset-actions {
        width: 100%;
    }

    .btn-load {
        width: 100%;
    }

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

/* ============================================
   Accessibility
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

@media (prefers-contrast: more) {
    .panel {
        border-width: 2px;
    }

    .btn {
        border: 2px solid currentColor;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .header-nav,
    .ad-placeholder,
    .btn {
        display: none;
    }

    .panel {
        page-break-inside: avoid;
    }
}

/* ============================================
   Utilities
   ============================================ */

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.transition-all {
    transition: all var(--transition-base);
}