/* KidsChat CSS - Modern, Kid-Friendly Design */

:root {
    /* Colors */
    --primary: #6C63FF;
    --primary-dark: #5A52D5;
    --primary-light: #8B85FF;
    --secondary: #FF6B6B;
    --success: #4CAF50;
    --warning: #FFB800;
    --danger: #FF5252;

    /* Backgrounds */
    --bg-primary: #F8F9FE;
    --bg-secondary: #FFFFFF;
    --bg-chat: #F0F2FF;
    --bg-user-message: #6C63FF;
    --bg-assistant-message: #FFFFFF;

    /* Text */
    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --text-light: #B2BEC3;
    --text-on-primary: #FFFFFF;

    /* Borders */
    --border-color: #E8ECF4;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

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

    /* Typography */
    --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-sm: 13px;
    --font-size-md: 15px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;

    /* Sidebar */
    --sidebar-width: 300px;
}

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

html, body {
    height: 100%;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

/* ===== LOGIN PAGE ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-md);
    overflow: hidden;
}

.login-container {
    width: 100%;
    max-width: 400px;
    position: relative;
}

.login-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-header .logo {
    font-size: 64px;
    margin-bottom: var(--spacing-sm);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.login-header h1 {
    font-size: var(--font-size-xl);
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.login-header p {
    color: var(--text-secondary);
}

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

.login-form label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.login-form label .icon {
    font-size: 18px;
}

.login-form input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-md);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.1);
}

.login-form input::placeholder {
    color: var(--text-light);
}

.error-message {
    background: #FFF5F5;
    color: var(--danger);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    text-align: center;
}

.login-button {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: background 0.2s, transform 0.1s;
}

.login-button:hover {
    background: var(--primary-dark);
}

.login-button:active {
    transform: scale(0.98);
}

.login-button:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Floating decorations */
.login-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.floating-emoji {
    position: absolute;
    font-size: 32px;
    top: -50px;
    left: var(--x);
    animation: float 4s ease-in-out infinite;
    animation-delay: var(--delay);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.8;
    }
    50% {
        transform: translateY(20px) rotate(10deg);
        opacity: 1;
    }
}

/* ===== CHAT PAGE ===== */
.chat-page {
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 44px;
    height: 44px;
    background: var(--bg-chat);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: var(--font-size-md);
}

.user-status {
    font-size: var(--font-size-sm);
    color: var(--success);
}

.new-chat-btn {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.1s;
}

.new-chat-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Conversations List */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.conversation-item {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: var(--spacing-xs);
}

.conversation-item:hover {
    background: var(--bg-chat);
}

.conversation-item.active {
    background: var(--primary);
    color: white;
}

.conversation-item.active .conversation-date,
.conversation-item.active .conversation-preview {
    color: rgba(255, 255, 255, 0.8);
}

.conversation-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-preview {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-date {
    font-size: 11px;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
}

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

.empty-conversations .icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.logout-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    transition: background 0.2s, color 0.2s;
}

.logout-btn:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Chat Header */
.chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.chat-title {
    flex: 1;
}

.chat-title .title-text {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.action-btn {
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    transition: background 0.2s;
}

.action-btn:hover {
    background: var(--bg-chat);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--bg-chat);
}

/* Welcome Message */
.welcome-message {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 500px;
    margin: auto;
}

.welcome-icon {
    font-size: 72px;
    margin-bottom: var(--spacing-md);
    animation: bounce 2s infinite;
}

.welcome-message h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.welcome-message p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.suggestion-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.suggestion-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Messages */
.message {
    display: flex;
    margin-bottom: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

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

.message.user {
    justify-content: flex-end;
}

.message.assistant {
    justify-content: flex-start;
}

.message-bubble {
    max-width: 75%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    word-wrap: break-word;
}

.message.user .message-bubble {
    background: var(--bg-user-message);
    color: white;
    border-bottom-right-radius: var(--spacing-xs);
}

.message.assistant .message-bubble {
    background: var(--bg-assistant-message);
    box-shadow: var(--shadow-sm);
    border-bottom-left-radius: var(--spacing-xs);
}

.message-time {
    font-size: 11px;
    margin-top: var(--spacing-xs);
    opacity: 0.7;
}

.message.user .message-time {
    text-align: right;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
}

.typing-indicator .dot {
    width: 8px;
    height: 8px;
    background: var(--text-light);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator .dot:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator .dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* Input Area */
.input-area {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.message-form {
    max-width: 800px;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--bg-chat);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm);
}

.input-wrapper textarea {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: none;
    font-size: var(--font-size-md);
    font-family: inherit;
    resize: none;
    min-height: 24px;
    max-height: 120px;
    outline: none;
}

.input-wrapper textarea::placeholder {
    color: var(--text-light);
}

.send-btn {
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.1s;
}

.send-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.send-btn:disabled {
    background: var(--text-light);
    cursor: not-allowed;
}

.send-icon {
    font-size: 18px;
}

.input-info {
    display: flex;
    justify-content: flex-end;
    padding: var(--spacing-xs) var(--spacing-md);
}

.char-count {
    font-size: 11px;
    color: var(--text-light);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    text-align: center;
}

.loading-spinner,
.loading-spinner-large {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner-large {
    width: 48px;
    height: 48px;
    border-width: 4px;
    margin-bottom: var(--spacing-md);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 100;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .menu-toggle {
        display: block;
    }

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

    .messages-container {
        padding: var(--spacing-md);
    }

    .message-bubble {
        max-width: 85%;
    }

    .input-area {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .suggestions {
        flex-direction: column;
    }

    .suggestion-btn {
        width: 100%;
    }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s;
}

.sidebar-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-light);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}