@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600&family=Roboto+Mono:wght@400;500;700&display=swap');

:root {
    /* -- Colors: Glass Lab Dark Mode -- */
    --color-bg-deep: #0f172a;
    /* Deep Navy/Charcoal */
    --color-bg-surface: #1e293b;

    --color-accent-primary: #06b6d4;
    /* Cyan - Lab Instrument */
    --color-accent-secondary: #10b981;
    /* Emerald - Success/Safe */
    --color-accent-glow: rgba(6, 182, 212, 0.4);

    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;

    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(148, 163, 184, 0.1);
    --glass-highlight: rgba(255, 255, 255, 0.05);

    /* -- Spacing -- */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* -- Typography -- */
    --font-main: 'Outfit', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--color-bg-deep);
    color: var(--color-text-main);
    font-family: var(--font-main);
    min-height: 100vh;
    overflow-x: hidden;
    /* Subtle background grid */
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* -- Utilities -- */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.text-accent {
    color: var(--color-accent-primary);
}

.font-mono {
    font-family: var(--font-mono);
}

.uppercase {
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hidden {
    display: none !important;
}

/* -- Layout Containers -- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* -- 1. Home Page -- */
#home-page {
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    padding-bottom: 2rem;
}

.top-nav-btn {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    z-index: 10;
}

.top-nav-btn:hover {
    color: var(--color-text-main);
    border-color: var(--color-accent-primary);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
}

header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(to right, var(--color-text-main), var(--color-accent-primary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

header p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-lg);
}

.media-card {
    cursor: pointer;
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.media-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.media-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-muted);
}

/* -- 2. Calculator Page -- */
#calculator-page {
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
}

.calc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.back-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 8px;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-main);
}

/* Prep Mode Toggle */
.prep-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--glass-border);
    transition: .4s;
    border-radius: 24px;
    border: 1px solid var(--color-text-muted);
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--color-text-muted);
    transition: .4s;
    border-radius: 50%;
}

input:checked+.slider {
    background-color: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
}

input:checked+.slider:before {
    transform: translateX(20px);
    background-color: var(--color-bg-deep);
}

/* Bench - Input Area */
.bench-container {
    flex: 0 0 auto;
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.flask-input {
    background: radial-gradient(circle at center, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    border: 2px solid var(--color-accent-primary);
    border-radius: 20px 20px 40px 40px;
    /* Flask shape hint */
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    position: relative;
    min-width: 280px;
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.15);
}

.input-group {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
}

#volume-input {
    background: transparent;
    border: none;
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 700;
    width: 180px;
    text-align: right;
    outline: none;
    caret-color: var(--color-text-main);
    text-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

/* Remove arrows from number input */
#volume-input::-webkit-outer-spin-button,
#volume-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.unit-toggle {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem;
}

.unit-toggle:hover {
    color: var(--color-text-main);
}

/* Components List */
.components-list {
    flex: 1;
    overflow-y: auto;
    padding-bottom: var(--spacing-lg);
    display: grid;
    gap: var(--spacing-sm);
    align-content: start;
}

.component-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: 12px;
    transition: all 0.2s;
}

/* Prep Mode Active Styles */
.prep-active .component-row:hover {
    background: rgba(255, 255, 255, 0.03);
}

.comp-name {
    font-size: 1.1rem;
    font-weight: 400;
}

.comp-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--color-accent-secondary);
    font-weight: 500;
}

/* Checkbox specific */
.comp-check {
    width: 24px;
    height: 24px;
    margin-right: var(--spacing-sm);
    accent-color: var(--color-accent-secondary);
    cursor: pointer;
}

.comp-label-group {
    display: flex;
    align-items: center;
}

/* Checked state */
.component-row.checked {
    opacity: 0.5;
    text-decoration: line-through;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    #volume-input {
        font-size: 2.5rem;
        width: 140px;
    }

    .flask-input {
        padding: var(--spacing-md);
        min-width: 200px;
    }

    /* Fix Top Button Overlap */
    .top-nav-btn {
        position: relative;
        top: auto;
        right: auto;
        align-self: center;
        margin-bottom: var(--spacing-sm);
        width: fit-content;
    }

    /* Adjust Header for Mobile */
    header h1 {
        font-size: 1.75rem;
        line-height: 1.2;
    }

    header {
        margin-top: var(--spacing-sm);
    }
}

/* -- 3. New Features (Search, Categories, Recents) -- */

/* Search Bar */
.search-wrapper {
    position: relative;
    max-width: 600px;
    margin: var(--spacing-md) auto 0;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
}

.glass-input {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem 1rem 1rem 3rem;
    border-radius: 9999px;
    color: var(--color-text-main);
    font-family: var(--font-main);
    font-size: 1rem;
    outline: none;
    transition: all 0.2s;
}

.glass-input:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

/* Category Headers */
.category-header {
    grid-column: 1 / -1;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    padding-bottom: 0.5rem;
    color: var(--color-accent-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-bottom: 1px solid var(--glass-border);
}

.category-header:first-child {
    margin-top: 0;
}

/* Recent Items Container */
.recent-wrapper {
    margin: var(--spacing-md) auto;
    max-width: 800px;
    animation: fadeIn 0.5s ease;
}

.recent-label-header {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: left;
    margin-left: 0.5rem;
}

.recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.75rem;
}

.recent-card {
    display: flex;
    flex-direction: column;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border-color: var(--glass-border);
    cursor: pointer;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, rgba(30, 41, 59, 0.4) 100%);
    transition: all 0.2s ease;
    border: 1px solid rgba(6, 182, 212, 0.1);
}

.recent-card:hover {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(30, 41, 59, 0.6) 100%);
    transform: translateY(-2px);
    border-color: var(--color-accent-primary);
}

.recent-card strong {
    font-size: 0.95rem;
    color: var(--color-text-main);
    margin-bottom: 0.25rem;
}

.recent-card .cat-tag {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

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

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