/* filename: frontend/style.css */
/* ══════════════════════════════════════════════════════════════════
   QueryBridge – Conversational Database Agent
   Custom Design System (No Bootstrap)
   ══════════════════════════════════════════════════════════════════ */

/* ── CSS Variables ──────────────────────────────────────────────── */
:root {
    /* Palette */
    --bg-primary: #0f0f1a;
    --bg-secondary: #161625;
    --bg-tertiary: #1e1e32;
    --bg-card: rgba(30, 30, 50, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.03);

    --text-primary: #e8e8f0;
    --text-secondary: #9d9db8;
    --text-muted: #6b6b85;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    --border-color: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(99, 102, 241, 0.3);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --sidebar-width: 280px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

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

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ── Scrollbar ──────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }

/* ══════════════════════════════════════════════════════════════════
   SIDEBAR
   ══════════════════════════════════════════════════════════════════ */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    overflow-y: auto;
    transition: transform var(--transition-slow);
    z-index: 100;
}

.sidebar-header {
    margin-bottom: 28px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    color: var(--accent-primary);
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    padding-left: 38px;
}

/* ── Sidebar sections ─────────────────────────────────────────── */
.sidebar-section {
    margin-bottom: 24px;
}

.sidebar-section-title {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 10px;
    padding-left: 4px;
}

/* ── Quick prompts ────────────────────────────────────────────── */
.quick-prompt {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.825rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.quick-prompt:hover {
    background: var(--bg-glass);
    border-color: var(--border-color);
    color: var(--text-primary);
    transform: translateX(4px);
}

.prompt-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

/* ── Settings ─────────────────────────────────────────────────── */
.setting-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting-item label {
    font-size: 0.75rem;
    color: var(--text-muted);
    padding-left: 4px;
}

.setting-item input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.setting-item input:focus {
    border-color: var(--accent-primary);
}

/* ── Sidebar footer ───────────────────────────────────────────── */
.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 4px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    animation: pulse-dot 2s infinite;
}

.status-dot.connected {
    background: var(--success);
    animation: none;
}

.status-dot.error {
    background: var(--error);
    animation: none;
}

.status-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ── Sidebar toggle ───────────────────────────────────────────── */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 200;
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--accent-primary);
}

/* ══════════════════════════════════════════════════════════════════
   MAIN CHAT AREA
   ══════════════════════════════════════════════════════════════════ */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-width: 0;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
}

/* ── Welcome card ─────────────────────────────────────────────── */
.welcome-card {
    text-align: center;
    padding: 48px 32px;
    margin: auto 0;
    animation: fadeIn 0.6s ease;
}

.welcome-icon {
    margin-bottom: 20px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.welcome-card h2 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.welcome-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    max-width: 480px;
    margin: 0 auto;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

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

/* ── Message bubbles ──────────────────────────────────────────── */
.message {
    display: flex;
    gap: 12px;
    animation: slideIn 0.35s ease;
    max-width: 100%;
}

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

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--accent-gradient);
    color: white;
}

.message.system .message-avatar {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
}

.message-content {
    max-width: 75%;
    min-width: 0;
}

.message-bubble {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    line-height: 1.65;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

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

.message.system .message-bubble {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    backdrop-filter: blur(10px);
}

.message-time {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 6px;
    padding: 0 4px;
}

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

/* ── SQL block ────────────────────────────────────────────────── */
.sql-block {
    margin-top: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.sql-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.sql-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-primary);
}

.sql-copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.7rem;
    font-family: var(--font-sans);
    padding: 2px 8px;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.sql-copy-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.sql-code {
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #c4b5fd;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* ── Data table ───────────────────────────────────────────────── */
.data-table-wrapper {
    margin-top: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.data-table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.data-table-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--success);
}

.data-table-count {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.data-table-container {
    overflow-x: auto;
    max-height: 320px;
    overflow-y: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.data-table th {
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 9px 14px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    white-space: nowrap;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background: rgba(99, 102, 241, 0.04);
    color: var(--text-primary);
}

/* ── Cached badge ─────────────────────────────────────────────── */
.cached-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 20px;
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--success);
    margin-top: 8px;
}

/* ── Typing indicator ─────────────────────────────────────────── */
.typing-indicator {
    display: flex;
    gap: 12px;
    animation: fadeIn 0.3s ease;
}

.typing-dots {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: 4px;
    backdrop-filter: blur(10px);
}

.typing-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-primary);
    animation: typingBounce 1.4s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

/* ── Error message ────────────────────────────────────────────── */
.error-bubble {
    background: rgba(239, 68, 68, 0.08) !important;
    border-color: rgba(239, 68, 68, 0.2) !important;
    color: #fca5a5 !important;
}

/* ══════════════════════════════════════════════════════════════════
   INPUT AREA
   ══════════════════════════════════════════════════════════════════ */
.input-area {
    padding: 16px 24px 20px;
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 8px 8px 8px 18px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 120px;
    padding: 6px 0;
}

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

.send-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--accent-gradient);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px var(--accent-glow);
}

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

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.input-hint {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 8px;
}

.input-hint kbd {
    display: inline-block;
    padding: 1px 5px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 0.6rem;
}

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

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 8px 0 32px rgba(0, 0, 0, 0.5);
    }

    .sidebar-toggle {
        display: flex;
    }

    .chat-container {
        padding: 16px 12px;
        padding-top: 60px;
    }

    .input-area {
        padding: 12px 12px 16px;
    }

    .message-content {
        max-width: 88%;
    }
}

@media (max-width: 480px) {
    .welcome-card {
        padding: 32px 16px;
    }

    .welcome-card h2 {
        font-size: 1.35rem;
    }
}