/* ============================================
   SoundFinder - Modern Design System
   ============================================ */

:root {
    /* Colors */
    --spotify-green: #1db954;
    --spotify-green-hover: #1ed760;
    --spotify-green-dark: #1aa34a;
    --bg-primary: #121212;
    --bg-secondary: #181818;
    --bg-tertiary: #1e1e1e;
    --bg-card: #1a1a1a;
    --bg-input: #2a2a2a;
    --border-color: #333333;
    --border-color-light: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-tertiary: #8a8a8a;
    --error: #e22134;
    --error-hover: #c62828;
    --warning: #ffa500;
    --success: #1db954;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(29, 185, 84, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(29, 185, 84, 0.18), transparent 55%),
        radial-gradient(circle at bottom right, rgba(30, 215, 96, 0.16), transparent 55%),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--spotify-green), var(--spotify-green-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 2rem;
    color: var(--text-primary);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    background: var(--bg-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(24, 24, 24, 0.8);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--spotify-green), var(--spotify-green-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.03em;
}

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

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--spotify-green);
    transition: width var(--transition-base);
}

.nav a:hover {
    color: var(--text-primary);
}

.nav a:hover::after {
    width: 100%;
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.container-narrow {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ============================================
   Auth Pages
   ============================================ */

.page-auth {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.auth-card {
    width: 100%;
    max-width: 480px;
    background: linear-gradient(145deg, rgba(18, 18, 18, 0.96), rgba(24, 24, 24, 0.98));
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--spotify-green);
    box-shadow: 0 0 0 3px rgba(29, 185, 84, 0.1);
}

textarea {
    min-height: 120px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

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

input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

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

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    text-align: center;
    font-family: inherit;
}

.btn-primary {
    background: var(--spotify-green);
    color: var(--text-primary);
}

.btn-primary:hover {
    background: var(--spotify-green-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-danger {
    background: var(--error);
    color: var(--text-primary);
}

.btn-danger:hover {
    background: var(--error-hover);
}

.btn:disabled {
    background: var(--bg-input);
    color: var(--text-tertiary);
    cursor: not-allowed;
    transform: none;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

/* ============================================
   Alerts & Messages
   ============================================ */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    animation: slideIn 0.3s ease;
}

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

.alert-error {
    background: rgba(226, 33, 52, 0.2);
    color: #ff6b7a;
    border: 1px solid var(--error);
}

.alert-success {
    background: rgba(29, 185, 84, 0.2);
    color: var(--spotify-green-hover);
    border: 1px solid var(--spotify-green);
}

.alert-warning {
    background: rgba(255, 165, 0, 0.2);
    color: #ffb84d;
    border: 1px solid var(--warning);
}

/* ============================================
   Stats & Metrics
   ============================================ */

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

.stat-card {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-tertiary));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card h3 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.stat-card .value {
    color: var(--spotify-green);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

/* ============================================
   Artist & Track Cards
   ============================================ */

.artist-card,
.track-card {
    position: relative;
    background: var(--bg-card);
    padding: var(--spacing-md);
    padding-right: calc(var(--spacing-md) * 2.5);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
}

.artist-card:hover,
.track-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--spotify-green);
    transform: translateX(4px);
}

.artist-select-wrapper {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 2px 6px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 999px;
    border: 1px solid var(--border-color-light);
}

.artist-select-wrapper input[type="checkbox"] {
    width: 18px;
    height: 18px;
    appearance: none;
    -webkit-appearance: none;
    border-radius: 6px;
    border: 2px solid var(--border-color-light);
    background: var(--bg-input);
    display: inline-block;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.artist-select-wrapper input[type="checkbox"]:checked {
    border-color: var(--spotify-green);
    background: var(--spotify-green);
    box-shadow: 0 0 0 2px rgba(29, 185, 84, 0.3);
}

.artist-select-wrapper input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 0px;
    width: 5px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.artist-name,
.track-name {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.artist-name a,
.track-name a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.artist-name a:hover,
.track-name a:hover {
    color: var(--spotify-green);
}

.artist-info,
.track-info {
    flex: 1;
}

.artist-info p,
.track-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.sort-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.sort-controls-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.sort-controls-label span {
    font-weight: 600;
    color: var(--text-primary);
}

.sort-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.btn-sort {
    background: transparent;
    border: 1px solid var(--border-color-light);
    color: var(--text-secondary);
    padding: 4px 10px;
    font-size: 0.85rem;
}

.btn-sort:hover {
    border-color: var(--spotify-green);
    color: var(--spotify-green);
    background: rgba(29, 185, 84, 0.08);
}

.btn-sort-active {
    border-color: var(--spotify-green);
    color: var(--spotify-green-hover);
    background: rgba(29, 185, 84, 0.16);
    box-shadow: var(--shadow-sm);
}

.sort-arrow {
    display: inline-block;
    margin-left: 4px;
    font-weight: bold;
    font-size: 0.9em;
    visibility: hidden;
}

/* Стили для красивых чекбоксов в форме фильтрации */
#filter_form input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    cursor: pointer;
    position: relative;
    margin-right: 6px;
    vertical-align: middle;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

#filter_form input[type="checkbox"]:hover {
    border-color: var(--spotify-green);
    background: rgba(29, 185, 84, 0.05);
}

#filter_form input[type="checkbox"]:checked {
    background: var(--spotify-green);
    border-color: var(--spotify-green);
}

#filter_form input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
    line-height: 1;
}

#filter_form label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.selection-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.selection-controls-main {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

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

.selection-controls-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

/* ============================================
   Links & Social
   ============================================ */

.link-item {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.link-item a {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-base);
}

.link-item a:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.link-instagram {
    border-color: #E1306C;
    color: #E1306C;
}

.link-instagram:hover {
    background: rgba(225, 48, 108, 0.1);
}

.link-facebook {
    border-color: #3b5998;
    color: #3b5998;
}

.link-facebook:hover {
    background: rgba(59, 89, 152, 0.1);
}

.link-twitter {
    border-color: #1DA1F2;
    color: #1DA1F2;
}

.link-twitter:hover {
    background: rgba(29, 161, 242, 0.1);
}

.link-youtube {
    border-color: #FF0000;
    color: #FF0000;
}

.link-youtube:hover {
    background: rgba(255, 0, 0, 0.1);
}

.link-website {
    border-color: var(--spotify-green);
    color: var(--spotify-green);
}

.link-website:hover {
    background: rgba(29, 185, 84, 0.1);
}

/* ============================================
   Playlists
   ============================================ */

.playlist-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.playlist-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--spotify-green);
    transform: translateX(4px);
}

.playlist-item.active {
    background: linear-gradient(135deg, rgba(29, 185, 84, 0.2), rgba(30, 215, 96, 0.1));
    border-color: var(--spotify-green);
}

.playlist-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.playlist-item p {
    color: var(--text-tertiary);
    font-size: 0.85rem;
    margin: 0;
}

.collection-description {
    overflow-wrap: anywhere;
    word-break: break-word;
}

.track-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
}

.track-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color-light);
}

.track-info h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.track-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.track-info h4 a {
    color: var(--spotify-green);
    text-decoration: none;
    transition: color var(--transition-base);
}

.track-info h4 a:hover {
    color: var(--spotify-green-hover);
}

/* ============================================
   Quick Actions
   ============================================ */

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.action-card {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-tertiary));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.action-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--spotify-green);
}

.action-card h3 {
    color: var(--spotify-green);
    font-size: 1.3rem;
    margin: 0;
}

.action-card p {
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   Subscription Badge
   ============================================ */

.subscription-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--spotify-green), var(--spotify-green-hover));
    color: var(--text-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   Loading & Empty States
   ============================================ */

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

.empty-state p {
    font-size: 1.1rem;
    margin: 0;
}

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

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .artist-card,
    .track-card {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

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

.text-muted {
    color: var(--text-secondary);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.flex {
    display: flex;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }