/*
 * ============================================================================
 * Circuit Scout - Public User Interface
 * Version 1.0.0
 * Designed & Developed by Tim Samoff
 * 
 * A DIY guitar pedal circuit database and search tool
 * 
 * Features: Lazy loading, favorites, dark/light mode, advanced filtering
 * 
 * @license GPL-3.0
 * @see https://samoff.com/circuit-scout
 * ============================================================================
 */

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

/* Dark Mode (Default) - ALL colors defined as variables */
:root, body.dark-mode {
    --gradient-start: #0f2b3d;
    --gradient-end: #0a1a24;
    --surface: #1a3a4f;
    --surface-light: #2a4a63;
    --text-primary: #e8f4f8;
    --text-secondary: #b8dce8;
    --accent-cyan: #2dd4bf;
    --accent-cyan-rgb: 45, 212, 191;
    --accent-teal: #14b8a6;
    --accent-blue: #0ea5e9;
    --accent-blue-rgb: 14, 165, 233;
    --card-bg: rgba(26, 58, 79, 0.85);
    --border-glow: rgba(45, 212, 191, 0.3);
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
    --hero-bg: rgba(10, 26, 36, 0.6);
    --theme-toggle-bg: rgba(255, 255, 255, 0.1);
    --theme-toggle-hover-bg: rgba(45, 212, 191, 0.2);
    --filter-input-bg: rgba(0, 0, 0, 0.3);
    --filter-btn-bg: rgba(255, 255, 255, 0.05);
    --filter-btn-hover-bg: rgba(45, 212, 191, 0.15);
    --filter-btn-active-bg: rgba(45, 212, 191, 0.25);
    --btn-secondary-bg: rgba(255, 255, 255, 0.05);
    --btn-secondary-hover-bg: rgba(45, 212, 191, 0.15);
    --fav-active-bg: rgba(251, 191, 36, 0.2);
    --circuit-type-bg: rgba(14, 165, 233, 0.2);
    --category-circuit-bg: rgba(45, 212, 191, 0.2);
    --category-reference-bg: rgba(16, 185, 129, 0.2);
    --difficulty-beginner-bg: rgba(16, 185, 129, 0.2);
    --difficulty-intermediate-bg: rgba(45, 212, 191, 0.2);
    --difficulty-advanced-bg: rgba(245, 158, 11, 0.2);
    --difficulty-expert-bg: rgba(239, 68, 68, 0.2);
    --verified-bg: rgba(16, 185, 129, 0.2);
    --unverified-bg: rgba(245, 158, 11, 0.2);
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --star-color: #fbbf24;
    --danger: #ef4444;
    --danger-rgb: 239, 68, 68;
    --beginner-color: #34d399;
    --advanced-color: #fbbf24;
    --expert-color: #f87171;
}

/* Light Mode - ALL colors redefined as variables */
body.light-mode {
    --gradient-start: #e0f2fe;
    --gradient-end: #bae6fd;
    --surface: #f0f9ff;
    --surface-light: #e0f2fe;
    --text-primary: #0c4a6e;
    --text-secondary: #075985;
    --accent-cyan: #0d9488;
    --accent-cyan-rgb: 13, 148, 136;
    --accent-teal: #0f766e;
    --accent-blue: #0284c7;
    --accent-blue-rgb: 2, 132, 199;
    --card-bg: rgba(255, 255, 255, 0.85);
    --border-glow: rgba(14, 165, 233, 0.3);
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.15);
    --hero-bg: rgba(255, 255, 255, 0.6);
    --theme-toggle-bg: rgba(0, 0, 0, 0.05);
    --theme-toggle-hover-bg: rgba(14, 165, 233, 0.2);
    --filter-input-bg: rgba(0, 0, 0, 0.05);
    --filter-btn-bg: rgba(0, 0, 0, 0.05);
    --filter-btn-hover-bg: rgba(14, 165, 233, 0.15);
    --filter-btn-active-bg: rgba(14, 165, 233, 0.25);
    --btn-secondary-bg: rgba(0, 0, 0, 0.05);
    --btn-secondary-hover-bg: rgba(14, 165, 233, 0.15);
    --fav-active-bg: rgba(251, 191, 36, 0.2);
    --circuit-type-bg: rgba(2, 132, 199, 0.15);
    --category-circuit-bg: rgba(13, 148, 136, 0.15);
    --category-reference-bg: rgba(16, 185, 129, 0.15);
    --difficulty-beginner-bg: rgba(16, 185, 129, 0.15);
    --difficulty-intermediate-bg: rgba(13, 148, 136, 0.15);
    --difficulty-advanced-bg: rgba(245, 158, 11, 0.15);
    --difficulty-expert-bg: rgba(239, 68, 68, 0.15);
    --verified-bg: rgba(16, 185, 129, 0.15);
    --unverified-bg: rgba(245, 158, 11, 0.15);
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.app-container { max-width: 1440px; margin: 0 auto; padding: 1.5rem; }

.hero {
    background: var(--hero-bg);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-glow);
    box-shadow: var(--shadow-md);
}

.hero-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 0.5rem; }

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-subtitle { 
    font-size: 0.95rem; 
    color: var(--text-secondary); 
    margin-top: 0.5rem; 
}

.hero-subtitle i { 
    margin-right: 0.5rem; 
}

.hero-stats { 
    font-size: 0.875rem; 
    color: var(--accent-teal); 
    margin-top: 1rem; 
    font-weight: 500; 
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.contact-btn {
    background: var(--theme-toggle-bg);
    border: 1px solid var(--border-glow);
    border-radius: 32px;
    padding: 0.5rem 0.85rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.contact-btn:hover {
    background: var(--theme-toggle-hover-bg);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.contact-btn i {
    margin-right: 0;
}

/* Credit Link */
.credit-link {
    color: var(--accent-cyan);
    text-decoration: none;
}

.credit-link:hover {
    text-decoration: underline;
}

.theme-toggle {
    background: var(--theme-toggle-bg);
    border: 1px solid var(--border-glow);
    border-radius: 32px;
    padding: 0.5rem 1rem;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle:hover { background: var(--theme-toggle-hover-bg); border-color: var(--accent-cyan); }

.main-grid { 
    display: grid; 
    grid-template-columns: 300px 1fr; 
    gap: 1.5rem; 
}

.filters-panel {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-glow);
    height: fit-content;
}

/* Desktop: sticky sidebar */
@media (min-width: 769px) {
    .filters-panel {
        position: sticky;
        top: 1rem;
    }
}

/* Mobile: normal flow */
@media (max-width: 768px) {
    .main-grid { 
        grid-template-columns: 1fr; 
        gap: 1rem;
    } 
    .app-container { 
        padding: 1rem; 
    } 
    .hero { 
        padding: 1.5rem; 
    }
    
    .filters-panel {
        position: relative;
        top: auto;
        margin-bottom: 1.5rem;
    }
    
    .results-header {
        margin-top: 0;
        padding-top: 0;
    }
    
    .results-area {
        clear: both;
        width: 100%;
    }
    
    .filters-panel {
        width: 100%;
        clear: both;
    }
}

.filter-group { margin-bottom: 1.5rem; }

.filter-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
}

.filter-input, .filter-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--filter-input-bg);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.filter-input:focus, .filter-select:focus { outline: none; border-color: var(--accent-cyan); box-shadow: 0 0 0 3px rgba(var(--accent-cyan-rgb), 0.2); }

.button-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.filter-btn {
    padding: 0.5rem 0.75rem;
    background: var(--filter-btn-bg);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-secondary {
    width: 100%;
    padding: 0.75rem;
    background: var(--btn-secondary-bg);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.5rem;
}

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

#fav-filter-btn.active { background: var(--fav-active-bg); border-color: var(--star-color); color: var(--star-color); }

.results-area { min-height: 60vh; }

.results-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: baseline; 
    margin-bottom: 1.5rem; 
    flex-wrap: wrap; 
    gap: 0.5rem; 
    position: relative;
    z-index: 1;
}
.results-title { font-size: 1.5rem; font-weight: 600; }
.results-count { font-size: 0.875rem; color: var(--accent-teal); font-weight: 500; }

.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 1.25rem; }

.loading-trigger { text-align: center; padding: 2rem; grid-column: 1 / -1; }
.loading-spinner { color: var(--text-secondary); font-size: 0.875rem; }
.loading-spinner i { margin-right: 0.5rem; }

.circuit-card {
    background: var(--card-bg);
    backdrop-filter: blur(4px);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    border: 1px solid var(--border-glow);
    transition: all 0.25s;
}

.circuit-card:hover { transform: translateY(-4px); border-color: var(--accent-cyan); box-shadow: var(--shadow-md); }

.circuit-image { width: 100%; height: 160px; object-fit: cover; border-radius: var(--radius-md); margin-bottom: 1rem; background: var(--surface-light); }

.circuit-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.circuit-name { font-size: 1.125rem; font-weight: 700; color: var(--accent-cyan); margin: 0; }

.star-btn { background: none; border: none; font-size: 1.25rem; cursor: pointer; padding: 0.25rem; transition: transform 0.1s; color: var(--text-secondary); }
.star-btn:hover { transform: scale(1.1); }
.star-btn.starred { color: var(--star-color); }
.star-btn .fa-star, .star-btn .far { margin-right: 0; }

.circuit-type-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; flex-wrap: wrap; gap: 0.5rem; }
.circuit-type { display: inline-block; font-size: 0.75rem; padding: 0.25rem 0.75rem; background: var(--circuit-type-bg); border-radius: 32px; font-weight: 500; }

.category-badge { font-size: 0.688rem; padding: 0.25rem 0.5rem; border-radius: 6px; font-weight: 600; display: inline-flex; align-items: center; gap: 0.25rem; }
.category-badge.circuit { background: var(--category-circuit-bg); color: var(--accent-cyan); }
.category-badge.reference { background: var(--category-reference-bg); color: var(--accent-teal); }

.circuit-description { font-size: 0.75rem; color: var(--text-secondary); margin: 0.5rem 0; line-height: 1.4; }
.circuit-meta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0.75rem 0; font-size: 0.75rem; color: var(--text-secondary); }
.meta-badge { display: flex; align-items: center; gap: 0.25rem; }

.component-preview { font-size: 0.688rem; color: var(--text-secondary); margin: 0.5rem 0; padding: 0.5rem 0; border-top: 1px solid var(--border-glow); border-bottom: 1px solid var(--border-glow); line-height: 1.4; }

.difficulty-badge { display: inline-block; padding: 0.25rem 0.5rem; border-radius: 6px; font-size: 0.688rem; font-weight: 600; margin: 0.5rem 0; }
.difficulty-Beginner { background: var(--difficulty-beginner-bg); color: var(--beginner-color); }
.difficulty-Intermediate { background: var(--difficulty-intermediate-bg); color: var(--accent-cyan); }
.difficulty-Advanced { background: var(--difficulty-advanced-bg); color: var(--advanced-color); }
.difficulty-Expert { background: var(--difficulty-expert-bg); color: var(--expert-color); }

.circuit-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 0.75rem; flex-wrap: wrap; gap: 0.5rem; }
.circuit-url { display: inline-flex; align-items: center; gap: 0.25rem; font-size: 0.75rem; color: var(--accent-blue); text-decoration: none; transition: color 0.2s; }
.circuit-url:hover { color: var(--accent-cyan); text-decoration: underline; }

.verified-badge-small { background: var(--verified-bg); color: var(--beginner-color); font-size: 0.688rem; padding: 0.25rem 0.5rem; border-radius: 6px; font-weight: 600; display: inline-flex; align-items: center; gap: 0.25rem; }
.unverified-badge-small { background: var(--unverified-bg); color: var(--advanced-color); font-size: 0.688rem; padding: 0.25rem 0.5rem; border-radius: 6px; font-weight: 600; display: inline-flex; align-items: center; gap: 0.25rem; }

.loading-state, .empty-state { text-align: center; padding: 3rem; color: var(--text-secondary); background: var(--card-bg); border-radius: var(--radius-lg); grid-column: 1 / -1; }

.fa, .fas, .far, .fab { margin-right: 0.5rem; }
.btn-secondary .fa, .btn-secondary .fas, .btn-secondary .far { margin-right: 0.5rem; }
.filter-label .fa, .filter-label .fas, .filter-label .far { margin-right: 0.5rem; }
.theme-toggle .fa, .theme-toggle .fas { margin-right: 0.5rem; }
.loading-state .fa-spinner { margin-right: 0.5rem; }
.star-btn .fa-star, .star-btn .far { margin-right: 0; }

/* Error and Empty States */
.error-state,
.empty-state {
    text-align: center;
    grid-column: 1 / -1;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-glow);
}

.error-state i,
.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    opacity: 0.7;
}

.error-state p,
.empty-state p {
    margin-bottom: 0.5rem;
}

.error-state .btn-secondary {
    margin-top: 1rem;
    width: auto;
    padding: 0.5rem 1rem;
    display: inline-flex;
}

/* Dropdown styling for better readability */
.filter-select,
.filter-input {
    background: var(--filter-input-bg);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    padding: 0.75rem 1rem;
    transition: all 0.2s;
}

/* Dropdown options styling */
.filter-select option {
    background: var(--surface);
    color: var(--text-primary);
    padding: 0.5rem;
}

/* For dark mode specifically */
body.dark-mode .filter-select option {
    background: var(--surface);
    color: var(--text-primary);
}

/* For light mode specifically */
body.light-mode .filter-select option {
    background: var(--surface);
    color: var(--text-primary);
}

/* Modal for favorites message */
.favorites-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.favorites-modal {
    background: var(--surface);
    border-radius: 20px;
    padding: 2rem;
    max-width: 350px;
    width: 90%;
    text-align: center;
    border: 1px solid var(--accent-cyan);
    box-shadow: var(--shadow-md);
    animation: modalFadeIn 0.2s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.favorites-modal i {
    font-size: 3.5rem;
    color: var(--star-color);
    margin-bottom: 1rem;
    display: block;
}

.favorites-modal h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.favorites-modal p {
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
    line-height: 1.5;
}

.favorites-modal button {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: var(--gradient-end);
    border: none;
    padding: 0.6rem 1.8rem;
    border-radius: 40px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.favorites-modal button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--accent-cyan-rgb), 0.4);
}

@media (prefers-reduced-motion: reduce) { * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }
:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: 2px; }