/**
 * ================================================================
 * Playlist - Soumission musicale collaborative (Mobile-First v3.24.0)
 * ================================================================
 *
 * Playlist collaborative avec soumission de chansons, système de votes,
 * et modal de visualisation
 * Architecture mobile-first avec breakpoints progressifs
 *
 * @version 3.24.0
 */

/* ================================================================
   1. CSS VARIABLES
   ================================================================ */
:root {
    --cal-primary: #667eea; /* v3.9.4 - Fallback simplifié */
    --cal-secondary: #764ba2; /* v3.9.4 - Fallback simplifié */
    --cal-white: #FFFFFF;
    --cal-text: #2c3e50;
    --cal-text-secondary: #34495e;
    --cal-text-muted: #7f8c8d;
    --cal-text-light: #95a5a6;

    --playlist-gradient: linear-gradient(135deg, var(--cal-primary) 0%, var(--cal-secondary) 100%);
    --playlist-card-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --playlist-vote: #ff6b9d;
    --playlist-vote-secondary: #c06c84;
    --playlist-vote-gradient: linear-gradient(135deg, var(--playlist-vote) 0%, var(--playlist-vote-secondary) 100%);
    --playlist-error: #e74c3c;
    --playlist-border: #e0e0e0;

    --cal-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --cal-font-size-sm: 14px;
    --cal-font-size-base: 16px;
    --cal-font-size-lg: 18px;
    --cal-font-size-xl: 24px;
    --cal-font-size-2xl: 32px;

    --cal-spacing-xs: 8px;
    --cal-spacing-sm: 10px;
    --cal-spacing-md: 15px;
    --cal-spacing-lg: 20px;
    --cal-spacing-xl: 30px;
    --cal-spacing-2xl: 40px;
    --cal-spacing-3xl: 50px;

    --cal-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --cal-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --cal-shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.2);
    --cal-shadow-xl: 0 6px 16px rgba(0, 0, 0, 0.3);
    --cal-shadow-button: 0 4px 12px rgba(102, 126, 234, 0.4);
    --cal-shadow-button-hover: 0 6px 16px rgba(102, 126, 234, 0.5);
    --cal-shadow-vote: 0 4px 8px rgba(102, 126, 234, 0.4);

    --cal-radius-sm: 8px;
    --cal-radius-md: 12px;
    --cal-radius-lg: 20px;
    --cal-radius-xl: 50%;

    --cal-transition-base: 0.3s ease;
}

/* ================================================================
   2. CONTAINER
   ================================================================ */
.playlist-container {
    max-width: 100%;
    margin: 0 auto;
    padding: var(--cal-spacing-md);
    font-family: var(--cal-font-family);
}

@media (min-width: 768px) {
    .playlist-container {
        max-width: 800px;
        padding: var(--cal-spacing-lg);
    }
}

/* ================================================================
   3. HEADER
   ================================================================ */
.playlist-header {
    text-align: center;
    margin-bottom: var(--cal-spacing-xl);
}

.playlist-header h2 {
    font-size: var(--cal-font-size-xl);
    margin-bottom: var(--cal-spacing-md);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .playlist-header h2 {
        font-size: var(--cal-font-size-2xl);
    }
}

.playlist-theme {
    background: var(--playlist-gradient);
    color: var(--cal-white);
    padding: var(--cal-spacing-sm) var(--cal-spacing-md);
    border-radius: var(--cal-radius-md);
    display: flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    margin: 0 auto;
    max-width: 600px;
}

@media (min-width: 768px) {
    .playlist-theme {
        padding: var(--cal-spacing-md) var(--cal-spacing-lg);
    }
}

.playlist-theme .theme-icon {
    font-size: 1.5em;
}

.playlist-theme p {
    margin: 0;
    font-size: var(--cal-font-size-sm);
}

@media (min-width: 768px) {
    .playlist-theme p {
        font-size: 1.1em;
    }
}

/* ================================================================
   4. FORM
   ================================================================ */
.playlist-form {
    background: var(--cal-white);
    border: 2px solid var(--playlist-border);
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-lg);
    box-shadow: var(--cal-shadow-md);
}

@media (min-width: 768px) {
    .playlist-form {
        padding: var(--cal-spacing-xl);
    }
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--cal-spacing-xs);
    font-weight: 600;
    color: var(--cal-text);
    margin-bottom: var(--cal-spacing-xs);
    font-size: 1.05em;
}

.label-icon {
    font-size: 1.2em;
}

.required {
    color: var(--playlist-error);
}

.optional {
    color: var(--cal-text-light);
    font-weight: normal;
    font-size: 0.9em;
}

.form-group input[type="text"],
.form-group input[type="url"] {
    width: 100%;
    padding: var(--cal-spacing-sm) var(--cal-spacing-md);
    border: 2px solid var(--playlist-border);
    border-radius: var(--cal-radius-sm);
    font-size: var(--cal-font-size-base);
    transition: all var(--cal-transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--cal-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.field-hint {
    display: block;
    margin-top: 5px;
    color: var(--cal-text-muted);
    font-size: var(--cal-font-size-sm);
}

.form-actions {
    margin-top: var(--cal-spacing-xl);
    text-align: center;
}

.submit-song-btn {
    background: var(--playlist-gradient);
    color: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    font-size: var(--cal-font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    box-shadow: var(--cal-shadow-button);
    min-height: 56px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

@media (min-width: 768px) {
    .submit-song-btn {
        padding: var(--cal-spacing-md) var(--cal-spacing-xl);
        font-size: 1.1em;
    }
}

.submit-song-btn:hover:not(:disabled) {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-button-hover);
}

@media (hover: none) {
    .submit-song-btn:active:not(:disabled) {
        opacity: 0.85;
        transform: scale(0.98) translate3d(0, 0, 0);
    }
}

.submit-song-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.3em;
}

/* ================================================================
   5. COMPLETED STATE
   ================================================================ */
.playlist-completed {
    text-align: center;
}

.user-song-result {
    background: var(--cal-white);
    border: 2px solid var(--playlist-border);
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-lg);
    margin-bottom: var(--cal-spacing-lg);
    box-shadow: var(--cal-shadow-md);
}

@media (min-width: 768px) {
    .user-song-result {
        padding: var(--cal-spacing-xl);
    }
}

.user-song-result h3 {
    font-size: var(--cal-font-size-lg);
    margin-bottom: var(--cal-spacing-lg);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .user-song-result h3 {
        font-size: 1.8em;
    }
}

.song-card-own {
    background: var(--playlist-card-gradient);
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-lg);
}

.song-card-own .song-info {
    text-align: left;
}

.song-title {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--cal-text);
    margin-bottom: var(--cal-spacing-xs);
}

@media (min-width: 768px) {
    .song-title {
        font-size: 1.3em;
    }
}

.song-artist {
    font-size: var(--cal-font-size-base);
    color: var(--cal-text-secondary);
    margin-bottom: var(--cal-spacing-sm);
}

@media (min-width: 768px) {
    .song-artist {
        font-size: 1.1em;
    }
}

.song-link {
    display: inline-block;
    background: var(--playlist-gradient);
    color: var(--cal-white);
    padding: var(--cal-spacing-xs) var(--cal-spacing-md);
    border-radius: var(--cal-radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--cal-transition-base);
    margin-top: var(--cal-spacing-sm);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.song-link:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-vote);
}

@media (hover: none) {
    .song-link:active {
        opacity: 0.85;
        transform: translate3d(0, 0, 0);
    }
}

.song-date {
    margin-top: var(--cal-spacing-md);
    color: var(--cal-text-muted);
    font-size: var(--cal-font-size-sm);
}

/* ================================================================
   6. VIEW PLAYLIST BUTTON
   ================================================================ */
.playlist-view-section {
    margin-top: var(--cal-spacing-lg);
    text-align: center;
}

.view-playlist-btn {
    background: var(--playlist-gradient);
    color: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    font-size: var(--cal-font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--cal-spacing-sm);
    box-shadow: var(--cal-shadow-button);
    min-height: 56px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

@media (min-width: 768px) {
    .view-playlist-btn {
        padding: var(--cal-spacing-md) var(--cal-spacing-xl);
        font-size: 1.1em;
    }
}

.view-playlist-btn:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-button-hover);
}

@media (hover: none) {
    .view-playlist-btn:active {
        opacity: 0.85;
        transform: scale(0.98) translate3d(0, 0, 0);
    }
}

.playlist-count {
    opacity: 0.9;
    font-size: 0.95em;
}

/* ================================================================
   7. PLAYLIST MODAL
   ================================================================ */
.playlist-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    overflow-y: auto;
    padding: var(--cal-spacing-2xl) var(--cal-spacing-lg);
    transform: translate3d(0, 0, 0);
}

.playlist-modal.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.playlist-modal-close {
    position: fixed;
    top: var(--cal-spacing-lg);
    right: var(--cal-spacing-lg);
    background: var(--cal-white);
    border: none;
    border-radius: var(--cal-radius-xl);
    width: 40px;
    height: 40px;
    font-size: 1.5em;
    cursor: pointer;
    z-index: 10001;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--cal-shadow-md);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .playlist-modal-close {
        width: 50px;
        height: 50px;
        font-size: 2em;
    }
}

.playlist-modal-close:hover {
    transform: rotate(90deg) scale(1.1) translate3d(0, 0, 0);
    background: #ff4444;
    color: var(--cal-white);
}

@media (hover: none) {
    .playlist-modal-close:active {
        opacity: 0.85;
        transform: scale(0.95) translate3d(0, 0, 0);
    }
}

.playlist-modal-header {
    text-align: center;
    color: var(--cal-white);
    margin-bottom: var(--cal-spacing-xl);
    width: 100%;
    max-width: 800px;
}

.playlist-modal-header h2 {
    font-size: 1.8em;
    margin-bottom: var(--cal-spacing-sm);
}

@media (min-width: 768px) {
    .playlist-modal-header h2 {
        font-size: 2.5em;
    }
}

.playlist-modal-theme {
    font-size: var(--cal-font-size-base);
    opacity: 0.9;
    margin-bottom: var(--cal-spacing-md);
}

@media (min-width: 768px) {
    .playlist-modal-theme {
        font-size: 1.2em;
    }
}

.votes-info {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--cal-radius-sm);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    margin-top: var(--cal-spacing-md);
}

.votes-remaining {
    font-size: 1em;
}

@media (min-width: 768px) {
    .votes-remaining {
        font-size: 1.1em;
    }
}

.votes-remaining strong {
    color: var(--playlist-vote);
    font-size: 1.2em;
}

.playlist-modal-content {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

/* ================================================================
   8. SONG CARDS
   ================================================================ */
.song-card {
    background: var(--cal-white);
    border-radius: var(--cal-radius-md);
    padding: var(--cal-spacing-lg);
    margin-bottom: var(--cal-spacing-md);
    box-shadow: var(--cal-shadow-lg);
    transition: all var(--cal-transition-base);
    transform: translate3d(0, 0, 0);
}

.song-card:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-xl);
}

.song-card.own-song {
    border: 3px solid var(--cal-primary);
    background: var(--playlist-card-gradient);
}

.song-main {
    display: flex;
    flex-direction: column;
    gap: var(--cal-spacing-md);
    margin-bottom: var(--cal-spacing-md);
}

@media (min-width: 768px) {
    .song-main {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--cal-spacing-lg);
    }
}

.song-info {
    flex: 1;
}

.song-info .song-title {
    font-size: 1.1em;
    margin-bottom: 5px;
}

@media (min-width: 768px) {
    .song-info .song-title {
        font-size: 1.2em;
    }
}

.song-info .song-artist {
    margin-bottom: var(--cal-spacing-xs);
}

.song-author {
    font-size: var(--cal-font-size-sm);
    color: var(--cal-text-muted);
}

.song-actions {
    display: flex;
    gap: var(--cal-spacing-sm);
}

.listen-btn {
    background: var(--playlist-gradient);
    color: var(--cal-white);
    padding: var(--cal-spacing-sm) var(--cal-spacing-lg);
    border-radius: var(--cal-radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--cal-transition-base);
    white-space: nowrap;
    flex: 1;
    text-align: center;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .listen-btn {
        flex: 0;
    }
}

.listen-btn:hover {
    transform: translateY(-2px) translate3d(0, 0, 0);
    box-shadow: var(--cal-shadow-vote);
}

@media (hover: none) {
    .listen-btn:active {
        opacity: 0.85;
        transform: translate3d(0, 0, 0);
    }
}

.song-footer {
    border-top: 1px solid var(--playlist-border);
    padding-top: var(--cal-spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--cal-spacing-sm);
}

@media (min-width: 768px) {
    .song-footer {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

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

.vote-song-btn {
    background: var(--cal-white);
    border: 2px solid var(--playlist-border);
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-xs) var(--cal-spacing-md);
    cursor: pointer;
    transition: all var(--cal-transition-base);
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
    font-size: var(--cal-font-size-base);
    min-height: 36px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate3d(0, 0, 0);
}

.vote-song-btn:hover:not(.disabled) {
    border-color: var(--playlist-vote);
    transform: scale(1.05) translate3d(0, 0, 0);
}

@media (hover: none) {
    .vote-song-btn:active:not(.disabled) {
        opacity: 0.85;
        transform: scale(1.02) translate3d(0, 0, 0);
    }
}

.vote-song-btn.voted {
    background: var(--playlist-vote-gradient);
    border-color: var(--playlist-vote);
    color: var(--cal-white);
}

.vote-song-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.vote-count {
    font-size: var(--cal-font-size-base);
}

.vote-hint {
    color: var(--cal-text-light);
    font-size: 0.85em;
}

.no-songs {
    text-align: center;
    color: var(--cal-white);
    font-size: 1.1em;
    padding: 60px var(--cal-spacing-lg);
}

@media (min-width: 768px) {
    .no-songs {
        font-size: 1.3em;
    }
}

.no-songs p {
    opacity: 0.8;
}

/* ================================================================
   9. SUCCESS OVERLAY
   ================================================================ */
.success-overlay-playlist {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 10000;
    padding: var(--cal-spacing-lg);
    transform: translate3d(0, 0, 0);
}

.success-overlay-playlist[style*="display: block"],
.success-overlay-playlist[style*="display: flex"] {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

.success-content {
    background: var(--cal-white);
    border-radius: var(--cal-radius-lg);
    padding: var(--cal-spacing-xl) var(--cal-spacing-lg);
    text-align: center;
    max-width: 500px;
    width: 100%;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    transform: translate3d(0, 0, 0);
}

@media (min-width: 768px) {
    .success-content {
        padding: var(--cal-spacing-3xl);
    }
}

.success-icon {
    width: 60px;
    height: 60px;
    background: var(--playlist-gradient);
    color: var(--cal-white);
    border-radius: var(--cal-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    margin: 0 auto var(--cal-spacing-lg);
}

@media (min-width: 768px) {
    .success-icon {
        width: 80px;
        height: 80px;
        font-size: 3em;
    }
}

.success-content h3 {
    font-size: var(--cal-font-size-xl);
    margin-bottom: var(--cal-spacing-md);
    color: var(--cal-text);
}

@media (min-width: 768px) {
    .success-content h3 {
        font-size: var(--cal-font-size-2xl);
    }
}

.success-content p {
    color: var(--cal-text-muted);
    font-size: var(--cal-font-size-base);
}

@media (min-width: 768px) {
    .success-content p {
        font-size: 1.1em;
    }
}

/* ================================================================
   10. SPINNER
   ================================================================ */
.spinner-small {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: var(--cal-white);
    border-radius: var(--cal-radius-xl);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg) translate3d(0, 0, 0); }
}