:root {
    --bg-primary: #121418;
    --bg-secondary: #1C1E22;
    --bg-card: #202124;
    --bg-hover: #222222;
    --border-color: #27272A;
    --border-alt: #313236;
    --text-primary: #D4D4D4;
    --text-secondary: #999999;
    --text-muted: #6B7280;
    --accent: #F55036;
}

* {
    color-scheme: dark;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    margin: 0;
    padding: 0;
}

/* Common Components */
input {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

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

input:focus {
    border-color: var(--accent);
    outline: none;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--bg-primary);
    font-weight: 500;
    transition: background-color 0.2s;
    border-radius: 6px;
}

.btn-primary:hover {
    background-color: #e74a2f;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.link-primary {
    color: var(--accent);
    text-decoration: none;
}

.link-primary:hover {
    text-decoration: underline;
}

/* Message Styles */
.error-message {
    background-color: rgba(245, 80, 54, 0.1);
    border: 1px solid rgba(245, 80, 54, 0.3);
    color: #ff6b5b;
    display: none;
    border-radius: 6px;
}

.error-message.show {
    display: block;
}

.success-message {
    background-color: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #4ade80;
    display: none;
    border-radius: 6px;
}

.success-message.show {
    display: block;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

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

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

/* ══════════════════════════════════════════════════════════
   RESPONSIVE — Mobile sidebar overlay + hamburger toggle
   ════════════════════════════════════════════════════════ */

/* Hamburger button (hidden on desktop, shown on mobile) */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 60;
    background: rgba(24, 24, 27, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(63, 63, 70, 0.6);
    border-radius: 12px;
    padding: 10px;
    color: #d4d4d8;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.mobile-menu-btn:hover {
    background: rgba(39, 39, 42, 0.95);
    color: #ffffff;
}

.mobile-menu-btn svg {
    width: 22px;
    height: 22px;
}

/* Sidebar overlay backdrop */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
        z-index: 45 !important;
        opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
}

/* ── Mobile breakpoint (below 768px) ──────────────────── */
@media (max-width: 767px) {

    /* Show hamburger */
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Show overlay when sidebar is open */
    .sidebar-overlay.active {
        display: block;
    }

    /* Sidebar → off-canvas drawer */
    .app-sidebar {
        position: fixed !important;
        top: 0;
        left: 0;
        bottom: 0;
        width: 300px !important;
        max-width: 85vw;
        z-index: 50 !important;
        padding-top: 60px;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    /* Main content takes full width */
    .app-main {
        width: 100% !important;
        margin-left: 0 !important;
    }

    /* Chat/Agent header: add left padding for hamburger */
    .app-header {
        padding-left: 64px !important;
    }

    /* Chat messages area: less padding on mobile */
    .app-messages {
        padding-left: 16px !important;
        padding-right: 16px !important;
    }

    /* Chat input area */
    .app-input-area {
        padding-left: 16px !important;
        padding-right: 16px !important;
    }

    /* Admin pages: mobile tweaks */
    .admin-content {
        padding: 16px !important;
    }

    .admin-header {
        padding-left: 64px !important;
        padding-right: 16px !important;
    }

    /* Signup: stack name fields vertically */
    .signup-name-grid {
        grid-template-columns: 1fr !important;
    }

    /* Profile: stack columns vertically */
    .profile-grid {
        grid-template-columns: 1fr !important;
    }

    /* Admin stats: 2-col on mobile */
    .admin-stats-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    /* Intent training: search below title */
    .intent-header-flex {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 12px !important;
    }

    .intent-search-input {
        width: 100% !important;
    }

    /* User management filters: stack */
    .filters-flex {
        flex-direction: column !important;
    }

    /* Hide table columns on small screens */
    .hide-mobile {
        display: none !important;
    }
}

/* ── Tablet (768-1023px) ───────────────────────────────── */
@media (min-width: 768px) and (max-width: 1023px) {
    .app-sidebar {
        width: 260px !important;
    }

    .admin-stats-grid {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}