/* ============================================
   Spotify Card Generator - styles.css
   Mobile-first, Spotify-inspired design
   ============================================ */

/* CSS Variables */
:root {
    /* Spotify Colors */
    --spotify-black: #191414;
    --spotify-green: #1DB954;
    --spotify-white: #FFFFFF;

    /* Gradient Colors */
    --gradient-green: linear-gradient(135deg, #1DB954 0%, #191414 100%);
    --gradient-purple: linear-gradient(135deg, #8B5CF6 0%, #191414 100%);
    --gradient-blue: linear-gradient(135deg, #3B82F6 0%, #191414 100%);
    --gradient-orange: linear-gradient(135deg, #F97316 0%, #191414 100%);
    --gradient-pink: linear-gradient(135deg, #EC4899 0%, #191414 100%);

    /* UI Colors */
    --bg-dark: #121212;
    --bg-card: #181818;
    --bg-input: #282828;
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --text-muted: #727272;
    --border-color: #404040;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;

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

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 50%;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
}

/* Header */
.header {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--spotify-green);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Preview Container */
.preview-container {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#previewCanvas {
    width: 100%;
    max-width: 280px;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Style Selector */
.style-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
}

.style-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
}

.style-options {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.style-btn {
    width: 44px;
    height: 44px;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    background: transparent;
    cursor: pointer;
    padding: 4px;
    transition: var(--transition-fast);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.style-btn:hover {
    transform: scale(1.1);
}

.style-btn.active {
    border-color: var(--spotify-white);
}

.style-color {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-sm);
}

/* Form */
.card-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* Inputs */
input[type="text"],
input[type="number"] {
    width: 100%;
    min-height: 48px;
    padding: var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: var(--spotify-green);
    box-shadow: 0 0 0 2px rgba(29, 185, 84, 0.2);
}

input::placeholder {
    color: var(--text-muted);
}

/* Number input - remove spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* Songs List */
.songs-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.song-number {
    min-width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--spotify-green);
    color: var(--spotify-black);
    font-weight: 700;
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.song-input input {
    flex: 1;
}

/* Form Actions */
.form-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 52px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    border: none;
    border-radius: 500px;
    cursor: pointer;
    transition: var(--transition-fast);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.98);
}

.btn-icon {
    font-size: 1.2rem;
}

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

.btn-primary:hover {
    background-color: #1ed760;
    transform: scale(1.02);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-secondary);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.1);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer a {
    color: var(--spotify-green);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive - Tablet and up */
@media (min-width: 480px) {
    .container {
        padding: var(--spacing-lg);
    }

    .header h1 {
        font-size: 2rem;
    }

    #previewCanvas {
        max-width: 320px;
    }

    .form-actions {
        flex-direction: row;
    }

    .form-actions .btn {
        flex: 1;
    }
}

/* Responsive - Desktop */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl);
    }

    #previewCanvas {
        max-width: 360px;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* Utility - Loading state */
.loading {
    animation: pulse 1.5s ease-in-out infinite;
    pointer-events: none;
}

/* Print - hide for cleaner output */
@media print {
    body {
        background: white;
    }

    .container {
        max-width: 100%;
    }

    .style-selector,
    .card-form,
    .footer {
        display: none;
    }
}