/* ========================================
   VARIABLES CSS - THÈME PREMIUM
   ======================================== */
:root {
    /* Palette de couleurs */
    --color-primary: #0A2463;
    --color-primary-light: #1E3A8A;
    --color-primary-dark: #06182E;
    --color-surface: #F8FAFC;
    --color-surface-elevated: #FFFFFF;
    --color-surface-dark: #2C3E50;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #64748B;
    --color-text-inverse: #FFFFFF;
    --color-accent: #FF6B35;
    --color-accent-hover: #E85D2F;
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    /* Typographie */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-md: 15px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 24px;
    --line-height: 1.5;
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 3rem;
    
    /* Bordures et ombres */
    --border-radius: 10px;
    --border-radius-sm: 6px;
    --border-radius-lg: 16px;
    --border-radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Tailles */
    --header-height: 72px;
    --input-height: auto;
    --avatar-size: 32px;
}

/* ========================================
   RESET ET BASE
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    height: 100%;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height);
    color: var(--color-text-primary);
    background: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%);
    height: 100%;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   HEADER PREMIUM
   ======================================== */
#app-header {
    background: var(--color-surface-elevated);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    max-width: none;
    width: 100%;
    margin: 0 auto;
    height: var(--header-height);
}

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

.logo-container {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.logo-icon {
    color: var(--color-text-inverse);
}

.header-titles {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.header-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.header-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

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

/* Bouton secondaire */
.btn-secondary {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--color-border-light);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

/* Indicateur de connexion */
.connection-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--border-radius-full);
    background: var(--color-success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    animation: pulse 2s infinite;
}

.connection-status.offline .status-dot {
    background: var(--color-error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

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

/* ========================================
   LAYOUT PRINCIPAL - PLEINE LARGEUR
   ======================================== */
#app {
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height));
    width: 100%;
    max-width: none;
    margin: 0 auto;
    background: var(--color-surface-elevated);
    position: relative;
}

/* ========================================
   ZONE DE CHAT
   ======================================== */
#chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-2xl) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    scroll-behavior: smooth;
    position: relative;
}

/* Scrollbar personnalisée */
#chat-container::-webkit-scrollbar {
    width: 6px;
}

#chat-container::-webkit-scrollbar-track {
    background: transparent;
}

#chat-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--border-radius-full);
}

#chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* ========================================
   MESSAGES - DESIGN PREMIUM
   ======================================== */
.message {
    display: flex;
    gap: var(--spacing-md);
    max-width: 85%;
    animation: messageSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    animation-fill-mode: forwards;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message-bot {
    align-self: flex-start;
}

.message-user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-error {
    align-self: center;
    max-width: 90%;
}

/* Avatar */
.message-avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    min-width: var(--avatar-size);
    border-radius: var(--border-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow);
}

.message-user .message-avatar {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
}

/* Wrapper du message */
.message-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Header du message */
.message-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-sm);
}

.message-sender {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.message-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* Contenu du message */
.message-content {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--border-radius);
    word-wrap: break-word;
    white-space: pre-wrap;
    position: relative;
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

.message-bot .message-content {
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.95) 0%, rgba(255, 255, 255, 0.95) 100%);
    border-bottom-left-radius: 6px;
    box-shadow: var(--shadow);
}

.message-user .message-content {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-text-inverse);
    border-bottom-right-radius: 6px;
    border: none;
    box-shadow: var(--shadow-md);
}

.message-error .message-content {
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
    color: var(--color-error);
    text-align: center;
    border-color: var(--color-error);
}

/* Bouton copier (apparaît au hover) */
.message:hover .copy-btn {
    opacity: 1;
}

.copy-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.copy-btn:hover {
    background: var(--color-surface-elevated);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ========================================
   INDICATEUR DE FRAPPE
   ======================================== */
.typing-indicator {
    padding: 0 var(--spacing-xl);
    animation: fadeIn 0.3s ease;
}

.typing-indicator.hidden {
    display: none;
}

.typing-dots {
    display: flex;
    gap: 6px;
    padding: var(--spacing-md);
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--color-text-secondary);
    border-radius: var(--border-radius-full);
    animation: typingBounce 1.4s infinite;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* ========================================
   SUGGESTIONS RAPIDES
   ======================================== */
.quick-suggestions {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(10, 36, 99, 0.03) 0%, rgba(30, 58, 138, 0.05) 100%);
    border-radius: var(--border-radius-lg);
    margin: 0 var(--spacing-xl) var(--spacing-xl);
    border: 1px dashed var(--color-border);
    animation: fadeIn 0.5s ease;
}

.suggestions-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

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

.suggestion-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    font-weight: 500;
}

.suggestion-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   BOUTON SCROLL TO BOTTOM
   ======================================== */
.scroll-to-bottom {
    position: absolute;
    bottom: 100px;
    right: var(--spacing-xl);
    width: 44px;
    height: 44px;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    z-index: 50;
}

.scroll-to-bottom.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
}

.scroll-to-bottom:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* ========================================
   FORMULAIRE DE SAISIE PREMIUM
   ======================================== */
#chat-form {
    background: var(--color-surface-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.input-container {
    max-width: 900px;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(10, 36, 99, 0.1);
    background: var(--color-surface-elevated);
}

#user-input {
    flex: 1;
    padding: var(--spacing-sm) 0;
    border: none;
    background: transparent;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: var(--line-height);
    resize: none;
    min-height: 24px;
    max-height: 120px;
    color: var(--color-text-primary);
}

#user-input:focus {
    outline: none;
}

#user-input::placeholder {
    color: var(--color-text-secondary);
}

#user-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--color-border-light);
    color: var(--color-text-primary);
}

#send-button {
    width: 40px;
    height: 40px;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow);
}

#send-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

#send-button:active:not(:disabled) {
    transform: translateY(0);
}

#send-button:disabled {
    background: var(--color-border);
    cursor: not-allowed;
    opacity: 0.6;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.input-hint,
.char-counter {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* ========================================
   STYLES MARKDOWN - IMAGES ET FORMATAGE
   ======================================== */
.message-image-wrapper {
    margin: var(--spacing-lg) 0;
    display: flex;
    justify-content: center;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.message-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    cursor: zoom-in;
    transition: transform var(--transition-base);
}

.message-image:hover {
    transform: scale(1.02);
}

.image-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    font-style: italic;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--color-error);
}

.message-heading {
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text-primary);
}

.message-bot .message-heading {
    color: var(--color-primary);
}

.message-user .message-heading {
    color: var(--color-text-inverse);
}

.message-paragraph {
    margin: var(--spacing-md) 0;
    line-height: 1.7;
}

.message-list {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-2xl);
}

.message-list-item {
    margin: var(--spacing-sm) 0;
    line-height: 1.6;
}

.message-content strong {
    font-weight: 700;
    color: inherit;
}

/* ========================================
   MODAL LIGHTBOX
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    z-index: 1001;
    animation: modalZoomIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.modal-close {
    position: absolute;
    top: -50px;
    right: 0;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-full);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

#modal-image {
    max-width: 100%;
    max-height: 85vh;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

.modal-caption {
    margin-top: var(--spacing-md);
    text-align: center;
    color: white;
    font-size: var(--font-size-sm);
}

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    min-width: 300px;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-surface-elevated);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-success);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: toastSlideIn 0.3s ease;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

.toast-icon {
    font-size: var(--font-size-xl);
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

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

.hidden {
    display: none !important;
}

/* ========================================
   RESPONSIVE - MOBILE
   ======================================== */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
        --spacing-xl: var(--spacing-lg);
        --spacing-2xl: var(--spacing-xl);
    }

    .header-content {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .header-subtitle,
    .btn-text {
        display: none;
    }

    .btn-secondary {
        padding: var(--spacing-sm);
    }

    #chat-container {
        padding: var(--spacing-lg);
        gap: var(--spacing-lg);
    }

    .message {
        max-width: 90%;
    }

    .quick-suggestions {
        margin: 0 var(--spacing-lg) var(--spacing-lg);
    }

    .suggestions-grid {
        grid-template-columns: 1fr;
    }

    #chat-form {
        padding: var(--spacing-lg);
    }

    .input-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .toast-container {
        right: var(--spacing-lg);
        left: var(--spacing-lg);
    }

    .toast {
        min-width: auto;
    }
}

/* ========================================
   RESPONSIVE - DESKTOP
   ======================================== */
@media (min-width: 1200px) {
    .message {
        max-width: 75%;
    }
}

/* ========================================
   ACCESSIBILITÉ
   ======================================== */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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