/* Variables */
:root {
    --color-dark-bg: #0f0f0f;
    --color-dark-surface: #1a1a1a;
    --color-dark-surface-light: #2a2a2a;
    --color-dark-border: #3a3a3a;
    --color-accent-orange: #ff6b35;
    --color-accent-orange-dark: #ff5722;
    --color-accent-orange-light: #ff8c42;
    --color-text-primary: #fafafa;
    --color-text-secondary: #b0b0b0;
    --color-text-tertiary: #808080;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-dark-bg);
    color: var(--color-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Force all text to primary color to keep consistent theming */
body, .container, .container * {
    color: var(--color-text-primary) !important;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--color-dark-surface-light);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    /* removed divider for cleaner top */
    background: linear-gradient(135deg, #1a1a1a, #0f0f0f);
    padding-top: var(--spacing-xl);
}

.header h1 {
    /* slightly larger and bolder for emphasis */
    font-weight: 700;
}


.header h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--color-text-primary);
    font-size: clamp(0.875rem, 2vw, 1.125rem);
}

/* Main Content */
.main-content {
    margin-bottom: var(--spacing-2xl);
}


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

/* Sections */
.section {
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* Input Groups */
.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-group label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

.input-group small {
    color: var(--color-text-tertiary);
    font-size: 0.825rem;
}

.input-group small.hint {
    color: var(--color-accent-orange);
    font-size: 0.8rem;
    font-style: italic;
    margin-top: 0.25rem;
    display: block;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

input[type="number"],
input[type="text"],
select {
    background: var(--color-dark-surface-light);
    border: 1px solid var(--color-dark-border);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--color-accent-orange);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

input[type="number"],
input[type="text"] {
    flex: 1;
}

select {
    min-width: 80px;
    cursor: pointer;
}

select option {
    background: var(--color-dark-surface);
    color: var(--color-text-primary);
}

.unit-label {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Presets */
.presets {
    background: transparent;
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.presets h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.preset-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.preset-btn:hover {
    background: var(--color-dark-surface-light);
    color: var(--color-text-primary);
    transform: scale(1.02);
}

/* Output Section */
.output-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
}

.output-card {
    background: linear-gradient(135deg, var(--color-dark-surface), var(--color-dark-surface-light));
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border-bottom: 1px solid var(--color-dark-border);
}

.output-header h3 {
    font-size: 0.95rem;
    color: var(--color-text-primary);
    margin: 0;
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition);
    font-size: 0.875rem;
    font-weight: 500;
}

.copy-btn:hover {
    background: var(--color-dark-surface-light);
}

.copy-btn.copied {
    color: #4ade80;
}

.output-box {
    padding: var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    overflow-x: auto;
}
.output-box code {
    color: var(--color-text-primary);
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    word-break: break-all;
}

.output-box.scss code {
    color: #b0e7e0;
}

/* Responsive Simulator Section */
.responsive-simulator {
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

.responsive-simulator h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.responsive-simulator .description {
    margin-bottom: var(--spacing-lg);
}

.simulator-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Preview Box */
#preview {
    background: var(--color-dark-surface);
    border: 2px solid var(--color-dark-border);
    padding: var(--spacing-2xl);
    text-align: center;
    border-radius: var(--radius-md);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(0.875rem, 2.5vw, 1.5rem);
    color: var(--color-text-primary);
    transition: font-size 0.1s ease-out;
}

/* Slider Wrapper */
.slider-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.viewport-slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(90deg,
        rgba(255,255,255,0.03) 0%,
        rgba(255,255,255,0.05) 50%,
        rgba(255,255,255,0.03) 100%);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.viewport-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-text-primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.6);
    transition: var(--transition);
}

.viewport-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.6);
}

.viewport-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-text-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.6);
    transition: var(--transition);
}

.viewport-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.6);
}

.viewport-slider::-moz-range-track {
    background: transparent;
    border: none;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

#slider-value {
    background: transparent;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-dark-border);
    color: var(--color-text-primary);
    font-weight: 600;
    flex: 1;
    text-align: center;
}

/* Simulator Info Cards */
.simulator-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

.info-card {
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
}

.info-label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1.5rem;
    color: var(--color-text-primary);
    font-weight: 600;
    font-family: 'Monaco', monospace;
}

/* Breakpoints Reference */
.breakpoints-reference {
    background: transparent;
    border: 1px solid var(--color-dark-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.ref-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.breakpoints-mini {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.breakpoint-quick {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-dark-surface);
    border: 1px solid var(--color-dark-border);
    color: var(--color-text-primary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.breakpoint-quick:hover {
    background: var(--color-dark-surface-light);
    color: var(--color-text-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}

.breakpoint-quick.active {
    background: var(--color-dark-surface-light);
    color: var(--color-text-primary);
}

/* Advanced Section */
.advanced-section {
    background: var(--color-dark-surface-light);
    border: 1px dashed var(--color-dark-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.advanced-section h3 {
    color: var(--color-accent-orange);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-dark-border);
    margin-top: var(--spacing-2xl);
}

.footer p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.footer code {
    background: transparent;
    color: var(--color-text-primary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Monaco', monospace;
    font-size: 0.8rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--color-accent-orange);
    color: var(--color-dark-bg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: var(--transition);
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg);
    }

    .header {
        margin-bottom: var(--spacing-xl);
    }

    .tabs {
        margin-bottom: var(--spacing-xl);
    }

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

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

    .output-section {
        grid-template-columns: 1fr;
    }

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

    #preview {
        padding: var(--spacing-lg);
    }

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

    .breakpoints-mini {
        gap: var(--spacing-xs);
    }

    .breakpoint-quick {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
        flex: 1;
        min-width: 80px;
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* Selection */
::selection {
    background: var(--color-accent-orange);
    color: var(--color-dark-bg);
}