/* ==========================================
   IT Helpdesk Chatbot — Design System
   ========================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
    /* Colors — Dark Theme (default) */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2235;
    --bg-card: rgba(26, 34, 53, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-hover: rgba(255, 255, 255, 0.08);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-accent: #38bdf8;

    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --accent-glow: 0 0 20px rgba(59, 130, 246, 0.3);

    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(59, 130, 246, 0.3);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --sidebar-width: 280px;
    --header-height: 64px;
    --input-height: 80px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-glass: rgba(0, 0, 0, 0.02);
    --bg-hover: rgba(0, 0, 0, 0.04);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-accent: #2563eb;

    --border-color: rgba(0, 0, 0, 0.08);
    --border-accent: rgba(59, 130, 246, 0.2);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.08);
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---------- App Container ---------- */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ---------- Sidebar ---------- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-slow);
    z-index: 100;
}

.sidebar-header {
    padding: 28px 24px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.bot-avatar-large {
    width: 56px;
    height: 56px;
    margin: 0 auto 12px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--accent-glow);
    animation: float 3s ease-in-out infinite;
}

.bot-avatar-large svg {
    width: 30px;
    height: 30px;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.sidebar-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 8px 12px;
    margin-bottom: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item .nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 10px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--accent-glow);
}

.new-chat-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.4);
}

/* ---------- Chat Main ---------- */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
    background: var(--bg-primary);
}

/* ---------- Header ---------- */
.chat-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    z-index: 10;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
}

.menu-toggle:hover {
    background: var(--bg-hover);
}

.header-info {
    flex: 1;
}

.header-title {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-title h2 {
    font-size: 16px;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 4px rgba(34, 197, 94, 0.3); }
    50% { box-shadow: 0 0 12px rgba(34, 197, 94, 0.6); }
}

.header-status {
    font-size: 12px;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 4px;
}

.icon-btn {
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

/* ---------- Messages Container ---------- */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.messages-container::-webkit-scrollbar {
    width: 6px;
}

.messages-container::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.messages-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ---------- Message Bubbles ---------- */
.message {
    display: flex;
    gap: 12px;
    animation: messageIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 600;
}

.message.bot .message-avatar {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--accent-glow);
}

.message.user .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-accent);
}

.message-content {
    max-width: 75%;
    min-width: 120px;
}

.message-bubble {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    font-size: 14px;
    line-height: 1.7;
    word-wrap: break-word;
}

.message.bot .message-bubble {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top-left-radius: 4px;
    backdrop-filter: blur(8px);
}

.message.user .message-bubble {
    background: var(--accent-gradient);
    color: white;
    border-top-right-radius: 4px;
}

.message-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
    padding: 0 4px;
}

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

/* ---------- Bot Message Formatting ---------- */
.message-bubble h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.message-bubble ol, .message-bubble ul {
    margin: 8px 0;
    padding-left: 20px;
}

.message-bubble li {
    margin-bottom: 6px;
}

.message-bubble code {
    background: rgba(59, 130, 246, 0.15);
    color: var(--text-accent);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'Consolas', 'Monaco', monospace;
}

.message-bubble .step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: var(--accent-gradient);
    color: white;
    font-size: 12px;
    font-weight: 700;
    border-radius: 50%;
    margin-right: 8px;
    flex-shrink: 0;
}

.message-bubble .step {
    display: flex;
    align-items: flex-start;
    margin: 10px 0;
    padding: 10px 12px;
    background: var(--bg-glass);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-primary);
}

.message-bubble .step-text {
    flex: 1;
}

.message-bubble .warning-box {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin: 12px 0;
    padding: 12px 14px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-sm);
    color: var(--warning);
    font-size: 13px;
}

.message-bubble .warning-box .warning-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.message-bubble .escalation-box {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin: 12px 0;
    padding: 12px 14px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.25);
    border-radius: var(--radius-sm);
    color: var(--danger);
    font-size: 13px;
}

.message-bubble .success-box {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin: 12px 0;
    padding: 12px 14px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.25);
    border-radius: var(--radius-sm);
    color: var(--success);
    font-size: 13px;
}

/* ---------- Quick Replies ---------- */
.quick-replies {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.quick-reply-btn {
    padding: 8px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-full);
    color: var(--text-accent);
    font-size: 13px;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.quick-reply-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--accent-glow);
}

/* ---------- Category Cards ---------- */
.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.category-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-family);
    color: var(--text-primary);
    font-size: 14px;
    text-align: left;
}

.category-card:hover {
    border-color: var(--border-accent);
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.category-card .card-icon {
    font-size: 24px;
    width: 36px;
    text-align: center;
}

.category-card .card-label {
    font-weight: 500;
}

.category-card .card-desc {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ---------- Issue Cards ---------- */
.issue-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 10px;
}

.issue-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    color: var(--text-primary);
    font-size: 13px;
    text-align: left;
    width: 100%;
}

.issue-btn:hover {
    border-color: var(--border-accent);
    background: var(--bg-hover);
    transform: translateX(4px);
}

.issue-btn .issue-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--bg-tertiary);
    color: var(--text-accent);
    font-size: 11px;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ---------- Typing Indicator ---------- */
.typing-indicator {
    display: flex;
    gap: 12px;
    animation: messageIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.typing-dots {
    display: flex;
    gap: 4px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    border-top-left-radius: 4px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.2s infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* ---------- Navigation Buttons ---------- */
.nav-buttons {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.back-btn, .start-over-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 13px;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.back-btn:hover, .start-over-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ---------- Input Area ---------- */
.input-area {
    padding: 12px 24px 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 800px;
    margin: 0 auto;
    padding: 4px 4px 4px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    transition: border-color var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#userInput {
    flex: 1;
    padding: 10px 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-family);
    outline: none;
}

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

.send-btn {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--accent-glow);
}

.send-btn:active {
    transform: scale(0.95);
}

.input-hint {
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ---------- Welcome Message ---------- */
.welcome-section {
    text-align: center;
    padding: 20px 0 8px;
}

.welcome-section .welcome-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.welcome-section h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 6px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-section p {
    color: var(--text-secondary);
    font-size: 14px;
    max-width: 420px;
    margin: 0 auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

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

    .menu-toggle {
        display: flex;
    }

    .messages-container {
        padding: 16px;
    }

    .input-area {
        padding: 8px 12px 12px;
    }

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

    .category-cards {
        grid-template-columns: 1fr;
    }
}

/* ---------- Overlay (mobile sidebar) ---------- */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    display: block;
}

/* ---------- Utility Animations ---------- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.fade-in {
    animation: fadeIn 0.4s ease;
}