/**
 * Styles Frontend - Student Subject Uploader
 * Inspiré du design moderne de ResiDentaire
 */

/* === VARIABLES CSS === */
:root {
    --ssu-primary: #00A8E6;
    --ssu-primary-dark: #0089C7;
    --ssu-secondary: #00BCD4;
    --ssu-success: #4CAF50;
    --ssu-warning: #FF9800;
    --ssu-error: #F44336;
    --ssu-info: #2196F3;
    
    --ssu-text-primary: #2C3E50;
    --ssu-text-secondary: #7F8C8D;
    --ssu-text-light: #BDC3C7;
    
    --ssu-bg-primary: #FFFFFF;
    --ssu-bg-secondary: #F8F9FA;
    --ssu-bg-tertiary: #E9ECEF;
    
    --ssu-border: #E1E5E9;
    --ssu-border-light: #F1F3F4;
    --ssu-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --ssu-shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.12);
    
    --ssu-radius: 8px;
    --ssu-radius-large: 12px;
    --ssu-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --ssu-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* === RESET ET BASE === */
.ssu-container * {
    box-sizing: border-box;
}

.ssu-container {
    font-family: var(--ssu-font-family);
    color: var(--ssu-text-primary);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* === FORMULAIRE PRINCIPAL === */
.ssu-upload-form {
    background: var(--ssu-bg-primary);
    border-radius: var(--ssu-radius-large);
    box-shadow: var(--ssu-shadow);
    padding: 32px;
    margin: 20px 0;
    position: relative;
    overflow: hidden;
}

.ssu-upload-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--ssu-primary), var(--ssu-secondary));
}

/* === HEADER === */
.ssu-form-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--ssu-border-light);
}

.ssu-form-title {
    color: var(--ssu-text-primary);
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 12px 0;
    letter-spacing: -0.5px;
}

.ssu-form-subtitle {
    color: var(--ssu-text-secondary);
    font-size: 16px;
    margin: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* === ZONE DE DRAG & DROP === */
.ssu-file-drop-zone {
    border: 2px dashed var(--ssu-border);
    border-radius: var(--ssu-radius);
    padding: 40px 20px;
    text-align: center;
    background: var(--ssu-bg-secondary);
    transition: var(--ssu-transition);
    cursor: pointer;
    position: relative;
    margin-bottom: 24px;
}

.ssu-file-drop-zone:hover,
.ssu-file-drop-zone.dragover {
    border-color: var(--ssu-primary);
    background: rgba(0, 168, 230, 0.05);
    transform: translateY(-2px);
}

.ssu-file-drop-zone.has-file {
    border-color: var(--ssu-success);
    background: rgba(76, 175, 80, 0.05);
}

.ssu-file-drop-zone.error {
    border-color: var(--ssu-error);
    background: rgba(244, 67, 54, 0.05);
}

.ssu-file-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    color: var(--ssu-primary);
    transition: var(--ssu-transition);
}

.ssu-file-drop-zone:hover .ssu-file-icon {
    transform: scale(1.1);
    color: var(--ssu-primary-dark);
}

.ssu-file-input {
    display: none;
}

.ssu-file-label {
    display: block;
    cursor: pointer;
}

.ssu-file-text {
    font-size: 16px;
    color: var(--ssu-text-primary);
    margin-bottom: 8px;
    font-weight: 500;
}

.ssu-file-subtext {
    font-size: 14px;
    color: var(--ssu-text-secondary);
    margin-bottom: 16px;
}

.ssu-file-types {
    font-size: 12px;
    color: var(--ssu-text-light);
    font-style: italic;
}

/* === INFORMATIONS FICHIER === */
.ssu-file-info {
    display: none;
    background: var(--ssu-bg-secondary);
    border-radius: var(--ssu-radius);
    padding: 16px;
    margin-top: 16px;
    border-left: 4px solid var(--ssu-success);
}

.ssu-file-info.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.ssu-file-name {
    font-weight: 600;
    color: var(--ssu-text-primary);
    margin-bottom: 4px;
}

.ssu-file-size {
    font-size: 14px;
    color: var(--ssu-text-secondary);
}

.ssu-file-remove {
    background: none;
    border: none;
    color: var(--ssu-error);
    cursor: pointer;
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--ssu-transition);
    float: right;
}

.ssu-file-remove:hover {
    background: rgba(244, 67, 54, 0.1);
}

/* === BARRE DE PROGRESSION UPLOAD === */
.ssu-upload-progress {
    display: none;
    margin: 16px 0;
}

.ssu-upload-progress.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.ssu-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--ssu-bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.ssu-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ssu-primary), var(--ssu-secondary));
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.ssu-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-image: linear-gradient(
        -45deg,
        rgba(255, 255, 255, 0.2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.2) 75%,
        transparent 75%,
        transparent
    );
    background-size: 20px 20px;
    animation: progressStripes 1s linear infinite;
}

.ssu-progress-text {
    text-align: center;
    margin-top: 8px;
    font-size: 14px;
    color: var(--ssu-text-secondary);
    font-weight: 500;
}

/* === CHAMPS DU FORMULAIRE === */
.ssu-form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

@media (min-width: 768px) {
    .ssu-form-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .ssu-form-group.full-width {
        grid-column: 1 / -1;
    }
}

.ssu-form-group {
    position: relative;
}

.ssu-form-label {
    display: block;
    font-weight: 600;
    color: var(--ssu-text-primary);
    margin-bottom: 8px;
    font-size: 14px;
    letter-spacing: 0.2px;
}

.ssu-form-label.required::after {
    content: ' *';
    color: var(--ssu-error);
}

.ssu-form-input,
.ssu-form-select,
.ssu-form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--ssu-border);
    border-radius: var(--ssu-radius);
    font-size: 16px;
    font-family: inherit;
    transition: var(--ssu-transition);
    background: var(--ssu-bg-primary);
    color: var(--ssu-text-primary);
}

.ssu-form-input:focus,
.ssu-form-select:focus,
.ssu-form-textarea:focus {
    outline: none;
    border-color: var(--ssu-primary);
    box-shadow: 0 0 0 3px rgba(0, 168, 230, 0.1);
}

.ssu-form-input.error,
.ssu-form-select.error,
.ssu-form-textarea.error {
    border-color: var(--ssu-error);
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
}

.ssu-form-textarea {
    min-height: 100px;
    resize: vertical;
}

.ssu-form-help {
    font-size: 12px;
    color: var(--ssu-text-light);
    margin-top: 4px;
}

.ssu-form-error {
    color: var(--ssu-error);
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

.ssu-form-error.show {
    display: block;
    animation: slideDown 0.2s ease-out;
}

/* === BOUTONS === */
.ssu-form-actions {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--ssu-border-light);
}

.ssu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border: none;
    border-radius: var(--ssu-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--ssu-transition);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    min-width: 140px;
}

.ssu-btn-primary {
    background: linear-gradient(135deg, var(--ssu-primary), var(--ssu-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(0, 168, 230, 0.3);
}

.ssu-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 168, 230, 0.4);
}

.ssu-btn-secondary {
    background: var(--ssu-bg-secondary);
    color: var(--ssu-text-primary);
    border: 2px solid var(--ssu-border);
}

.ssu-btn-secondary:hover:not(:disabled) {
    background: var(--ssu-bg-tertiary);
    border-color: var(--ssu-primary);
}

.ssu-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.ssu-btn-loading {
    position: relative;
    color: transparent !important;
}

.ssu-btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* === BARRE DE PROGRESSION SOUMISSION === */
.ssu-submission-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.ssu-submission-overlay.show {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.ssu-submission-progress {
    background: var(--ssu-bg-primary);
    border-radius: var(--ssu-radius-large);
    padding: 40px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: scaleIn 0.3s ease-out;
}

.ssu-submission-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    color: var(--ssu-primary);
    animation: pulse 2s infinite;
}

.ssu-submission-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--ssu-text-primary);
    margin-bottom: 16px;
}

.ssu-submission-steps {
    margin: 24px 0;
}

.ssu-step {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px 0;
    color: var(--ssu-text-secondary);
    transition: var(--ssu-transition);
}

.ssu-step.active {
    color: var(--ssu-primary);
    font-weight: 600;
}

.ssu-step.completed {
    color: var(--ssu-success);
}

.ssu-step-icon {
    width: 20px;
    height: 20px;
    border: 2px solid currentColor;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--ssu-transition);
}

.ssu-step.active .ssu-step-icon {
    border-width: 3px;
    animation: pulse 1.5s infinite;
}

.ssu-step.completed .ssu-step-icon {
    background: var(--ssu-success);
    border-color: var(--ssu-success);
    color: white;
}

.ssu-step.completed .ssu-step-icon::after {
    content: '✓';
    font-size: 12px;
    font-weight: bold;
}

/* === MESSAGES ET NOTIFICATIONS === */
.ssu-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--ssu-bg-primary);
    border-radius: var(--ssu-radius);
    padding: 16px 20px;
    box-shadow: var(--ssu-shadow-hover);
    z-index: 10000;
    max-width: 400px;
    opacity: 0;
    transform: translateX(100%);
    transition: var(--ssu-transition);
    border-left: 4px solid var(--ssu-info);
}

.ssu-toast.show {
    opacity: 1;
    transform: translateX(0);
}

.ssu-toast.success {
    border-left-color: var(--ssu-success);
}

.ssu-toast.error {
    border-left-color: var(--ssu-error);
}

.ssu-toast.warning {
    border-left-color: var(--ssu-warning);
}

.ssu-toast-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.ssu-toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.ssu-toast-text {
    flex: 1;
    font-size: 14px;
    line-height: 1.4;
}

.ssu-toast-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--ssu-text-primary);
}

.ssu-toast-message {
    color: var(--ssu-text-secondary);
}

.ssu-toast-close {
    background: none;
    border: none;
    color: var(--ssu-text-light);
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--ssu-transition);
}

.ssu-toast-close:hover {
    background: var(--ssu-bg-tertiary);
    color: var(--ssu-text-secondary);
}

/* === CONTENEUR DE TYPES === */
.ssu-subject-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.ssu-type-card {
    background: var(--ssu-bg-secondary);
    border: 2px solid var(--ssu-border);
    border-radius: var(--ssu-radius);
    padding: 20px;
    text-align: center;
    transition: var(--ssu-transition);
    cursor: pointer;
    position: relative;
}

.ssu-type-card:hover {
    border-color: var(--ssu-primary);
    transform: translateY(-2px);
    box-shadow: var(--ssu-shadow);
}

.ssu-type-card.selected {
    border-color: var(--ssu-primary);
    background: rgba(0, 168, 230, 0.05);
}

.ssu-type-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    color: var(--ssu-primary);
}

.ssu-type-title {
    font-weight: 600;
    color: var(--ssu-text-primary);
    margin-bottom: 8px;
}

.ssu-type-description {
    font-size: 14px;
    color: var(--ssu-text-secondary);
    line-height: 1.4;
}

/* === VALIDATION EN TEMPS RÉEL === */
.ssu-validation-indicator {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.ssu-form-group.validating .ssu-validation-indicator {
    display: flex;
    background: var(--ssu-info);
    animation: pulse 1s infinite;
}

.ssu-form-group.valid .ssu-validation-indicator {
    display: flex;
    background: var(--ssu-success);
}

.ssu-form-group.invalid .ssu-validation-indicator {
    display: flex;
    background: var(--ssu-error);
}

.ssu-form-group.valid .ssu-validation-indicator::after {
    content: '✓';
}

.ssu-form-group.invalid .ssu-validation-indicator::after {
    content: '✗';
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .ssu-container {
        padding: 16px;
    }
    
    .ssu-upload-form {
        padding: 24px 20px;
    }
    
    .ssu-form-title {
        font-size: 24px;
    }
    
    .ssu-file-drop-zone {
        padding: 30px 15px;
    }
    
    .ssu-btn {
        width: 100%;
        margin-bottom: 12px;
    }
    
    .ssu-form-actions {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    
    .ssu-subject-types {
        grid-template-columns: 1fr;
    }
    
    .ssu-submission-progress {
        padding: 30px 20px;
    }
    
    .ssu-toast {
        left: 20px;
        right: 20px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .ssu-form-title {
        font-size: 20px;
    }
    
    .ssu-file-icon {
        width: 40px;
        height: 40px;
    }
    
    .ssu-file-text {
        font-size: 14px;
    }
    
    .ssu-submission-title {
        font-size: 20px;
    }
}

/* === ANIMATIONS === */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes pulse {
    0%, 100% { 
        opacity: 1;
        transform: scale(1);
    }
    50% { 
        opacity: 0.7;
        transform: scale(1.05);
    }
}

@keyframes progressStripes {
    from { background-position: 0 0; }
    to { background-position: 20px 0; }
}

/* === THÈME SOMBRE === */
@media (prefers-color-scheme: dark) {
    :root {
        --ssu-text-primary: #E8EAED;
        --ssu-text-secondary: #9AA0A6;
        --ssu-text-light: #5F6368;
        
        --ssu-bg-primary: #202124;
        --ssu-bg-secondary: #303134;
        --ssu-bg-tertiary: #3C4043;
        
        --ssu-border: #3C4043;
        --ssu-border-light: #303134;
        --ssu-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        --ssu-shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
    
    .ssu-file-drop-zone {
        background: var(--ssu-bg-tertiary);
    }
    
    .ssu-toast {
        background: var(--ssu-bg-secondary);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }
}

/* === ACCESSIBILITÉ === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.ssu-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* === FOCUS VISIBLE === */
.ssu-btn:focus-visible,
.ssu-form-input:focus-visible,
.ssu-form-select:focus-visible,
.ssu-form-textarea:focus-visible,
.ssu-type-card:focus-visible {
    outline: 2px solid var(--ssu-primary);
    outline-offset: 2px;
}

/* === PRINT === */
@media print {
    .ssu-upload-form {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .ssu-toast,
    .ssu-submission-overlay {
        display: none !important;
    }
}