/* ============================================
   Seizmic HR Bot — "Industrial Intelligence"
   Brand: sage green #86a397 + burgundy #5d0b0d
   Aesthetic: Dark mode, engineering precision
   ============================================ */

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

:root {
    /* Brand colors — derived from seizmicinc.com */
    --brand: #86a397;
    --brand-light: #a3beb2;
    --brand-lighter: #c5d8ce;
    --brand-dark: #6b8a7d;
    --brand-muted: rgba(134, 163, 151, 0.12);
    --brand-glow: rgba(134, 163, 151, 0.25);
    --burgundy: #5d0b0d;
    --burgundy-light: #8a1f22;

    /* Surfaces */
    --bg-deepest: #0b1214;
    --bg-deep: #111b1e;
    --bg-surface: #182124;
    --bg-raised: #1f2d31;
    --bg-hover: #263538;
    --bg-active: #2e3f43;

    /* Text */
    --text-primary: #e0ebe6;
    --text-secondary: #8fa8a0;
    --text-muted: #5c7670;
    --text-on-brand: #0b1214;

    /* Semantic */
    --danger: #c0392b;
    --danger-light: #e74c3c;
    --danger-bg: rgba(192, 57, 43, 0.12);
    --success: #27ae60;
    --success-bg: rgba(39, 174, 96, 0.12);
    --warning: #d4a017;
    --warning-bg: rgba(212, 160, 23, 0.12);

    /* Borders */
    --border: rgba(134, 163, 151, 0.1);
    --border-strong: rgba(134, 163, 151, 0.2);

    /* Radius — engineering precision, not fluffy */
    --radius: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    /* Shadows */
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-brand: 0 0 20px rgba(134, 163, 151, 0.15);

    /* Typography — Sora for headings, DM Sans for body */
    --font-display: 'Sora', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Layout */
    --nav-height: 52px;
    --sidebar-width: 272px;
}

html, body {
    height: 100%;
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-deep);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--brand);
    text-decoration: none;
    transition: color 0.15s;
}

a:hover {
    color: var(--brand-light);
}

::selection {
    background: var(--brand);
    color: var(--text-on-brand);
}

/* Scrollbar — thin, brand-tinted */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--brand-dark); }

/* ============================================
   TOP NAVIGATION
   ============================================ */
.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    padding: 0 20px;
    background: var(--bg-deepest);
    border-bottom: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.nav-brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--brand);
}

.nav-brand::before {
    content: '◆';
    margin-right: 8px;
    font-size: 10px;
    vertical-align: 1px;
    opacity: 0.6;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius);
    transition: all 0.15s;
    letter-spacing: 0.01em;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    text-decoration: none;
}

.nav-links a.active {
    color: var(--brand);
    background: var(--brand-muted);
}

.nav-user {
    color: var(--text-muted);
    font-size: 12px;
    font-family: var(--font-mono);
    padding-left: 12px;
    margin-left: 8px;
    border-left: 1px solid var(--border);
}

.nav-logout {
    color: var(--text-muted) !important;
    font-size: 13px !important;
}

/* ============================================
   FLASH MESSAGES
   ============================================ */
.flash {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 13px;
    margin: 12px 20px;
    border-left: 3px solid;
}

.flash-error {
    background: var(--danger-bg);
    color: var(--danger-light);
    border-left-color: var(--danger);
}

.flash-success {
    background: var(--success-bg);
    color: var(--success);
    border-left-color: var(--success);
}

.flash-info {
    background: var(--brand-muted);
    color: var(--brand-light);
    border-left-color: var(--brand);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 18px;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-body);
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    gap: 6px;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--brand);
    color: var(--text-on-brand);
    border-color: var(--brand);
}

.btn-primary:hover {
    background: var(--brand-dark);
    border-color: var(--brand-dark);
    box-shadow: var(--shadow-brand);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-strong);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--brand-dark);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger-light);
    border-color: rgba(192, 57, 43, 0.3);
}

.btn-danger:hover {
    background: var(--danger);
    color: #fff;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: var(--font-display);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    font-family: var(--font-body);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: all 0.15s;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px var(--brand-muted);
    background: var(--bg-raised);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235c7670' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.card h3 {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ============================================
   TABLES
   ============================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.08em;
}

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

.data-table tr:hover td {
    background: var(--bg-raised);
}

.data-table td strong {
    color: var(--text-primary);
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 700;
    font-family: var(--font-mono);
    border-radius: var(--radius);
    background: var(--brand-muted);
    color: var(--brand);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.text-muted {
    color: var(--text-muted);
}

/* ============================================
   LOGIN PAGE
   ============================================ */
.page-login {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-deepest);
    position: relative;
    overflow: hidden;
}

/* Subtle engineering grid pattern */
.page-login::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.4;
    mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
}

/* Subtle brand glow */
.page-login::after {
    content: '';
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--brand-glow) 0%, transparent 70%);
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    box-shadow: var(--shadow-lg);
}

.login-logo {
    text-align: center;
    margin-bottom: 36px;
}

.login-logo-mark {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    background: var(--brand);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 22px;
    color: var(--text-on-brand);
    letter-spacing: -0.02em;
}

.login-logo h1 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 4px;
    letter-spacing: 0.02em;
}

.login-card .form-group input {
    background: var(--bg-raised);
    border-color: var(--border);
}

.login-card .btn-primary {
    margin-top: 8px;
    padding: 12px;
    font-size: 14px;
}

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

.chat-layout {
    display: flex;
    height: 100vh;
    padding-top: var(--nav-height);
}

/* -- Sidebar -- */
.chat-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-deepest);
    display: flex;
    flex-direction: column;
    padding: 16px 12px;
    border-right: 1px solid var(--border);
}

.chat-sidebar .btn {
    margin-bottom: 12px;
    flex-shrink: 0;
    font-size: 13px;
}

.sidebar-label {
    font-family: var(--font-display);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    padding: 8px 10px 6px;
}

.sidebar-sessions {
    flex: 1;
    overflow-y: auto;
}

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--text-muted);
    font-size: 13px;
    transition: all 0.15s;
    margin-bottom: 1px;
    border-left: 2px solid transparent;
}

.session-item:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
    border-left-color: var(--border-strong);
}

.session-item.active {
    background: var(--brand-muted);
    color: var(--brand-light);
    border-left-color: var(--brand);
}

.session-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-date {
    font-size: 10px;
    font-family: var(--font-mono);
    color: var(--text-muted);
    margin-left: 8px;
    flex-shrink: 0;
}

.sidebar-stats {
    padding-top: 12px;
    border-top: 1px solid var(--border);
    text-align: center;
    flex-shrink: 0;
}

.sidebar-stats small {
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* -- Welcome Screen -- */
.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    padding: 40px 20px;
}

.welcome-icon {
    width: 64px;
    height: 64px;
    background: var(--brand-muted);
    border: 1px solid var(--brand-dark);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    position: relative;
}

.welcome-icon::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 12px;
    border: 1px solid var(--brand-muted);
}

.welcome-icon svg {
    width: 28px;
    height: 28px;
    color: var(--brand);
}

.chat-welcome h2 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.chat-welcome p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 400px;
}

.welcome-suggestions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    max-width: 440px;
}

.suggestion-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-family: var(--font-body);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    width: 100%;
}

.suggestion-btn::before {
    content: '→';
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 14px;
    flex-shrink: 0;
    transition: all 0.2s;
}

.suggestion-btn:hover {
    background: var(--brand-muted);
    border-color: var(--brand-dark);
    color: var(--brand-light);
}

.suggestion-btn:hover::before {
    color: var(--brand);
    transform: translateX(2px);
}

/* -- Message Bubbles -- */
.message {
    display: flex;
    gap: 12px;
    max-width: 800px;
    animation: msgIn 0.25s ease-out;
}

@keyframes msgIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

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

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

.message-avatar {
    width: 30px;
    height: 30px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    font-family: var(--font-display);
    flex-shrink: 0;
    letter-spacing: 0.02em;
}

.message-user .message-avatar {
    background: var(--brand);
    color: var(--text-on-brand);
}

.message-assistant .message-avatar {
    background: var(--bg-raised);
    color: var(--brand);
    border: 1px solid var(--border);
}

.message-content {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.7;
    max-width: 640px;
}

.message-user .message-content {
    background: var(--brand);
    color: var(--text-on-brand);
}

.message-assistant .message-content {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-left: 2px solid var(--brand-dark);
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

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

.message-content li {
    margin-bottom: 4px;
}

.message-content strong {
    font-weight: 600;
    color: var(--brand-light);
}

.message-assistant .message-content strong {
    color: var(--brand-light);
}

.message-user .message-content strong {
    color: #fff;
}

.message-content .source-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--brand-muted);
    color: var(--brand);
    font-size: 11px;
    font-weight: 600;
    font-family: var(--font-mono);
    padding: 2px 8px;
    border-radius: var(--radius);
    margin-top: 6px;
    margin-right: 4px;
    letter-spacing: 0.02em;
}

.message-content .source-tag::before {
    content: '◇';
    font-size: 8px;
    opacity: 0.6;
}

.message-user .message-content .source-tag {
    background: rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.9);
}

/* -- Message feedback -- */
.message-feedback {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.feedback-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3px 8px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 12px;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 4px;
}

.feedback-btn:hover {
    border-color: var(--brand-dark);
    color: var(--brand);
    background: var(--brand-muted);
}

.feedback-btn.active {
    border-color: var(--brand);
    color: var(--brand);
    background: var(--brand-muted);
}

/* -- Typing Indicator -- */
.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 4px 0;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--brand-dark);
    animation: pulse 1.4s infinite;
}

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

@keyframes pulse {
    0%, 60%, 100% { opacity: 0.25; transform: scale(0.85); }
    30% { opacity: 1; transform: scale(1); }
}

/* -- Chat Input -- */
.chat-input-area {
    padding: 16px 24px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-deep);
    flex-shrink: 0;
}

.input-row {
    display: flex;
    gap: 8px;
    align-items: flex-end;
    max-width: 800px;
    margin: 0 auto;
}

.input-row textarea {
    flex: 1;
    resize: none;
    padding: 12px 16px;
    font-size: 14px;
    font-family: var(--font-body);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--text-primary);
    line-height: 1.5;
    max-height: 160px;
    transition: all 0.15s;
}

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

.input-row textarea:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px var(--brand-muted);
    background: var(--bg-raised);
}

.btn-send {
    width: 42px;
    height: 42px;
    padding: 0;
    background: var(--brand);
    color: var(--text-on-brand);
    border: none;
    border-radius: var(--radius-md);
    flex-shrink: 0;
    transition: all 0.15s;
    cursor: pointer;
}

.btn-send:hover {
    background: var(--brand-dark);
    box-shadow: var(--shadow-brand);
}

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

.input-hint {
    text-align: center;
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

/* ============================================
   DOCUMENTS PAGE
   ============================================ */
.page-documents {
    padding-top: var(--nav-height);
}

.content-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 24px;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

/* Upload tabs */
.upload-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-display);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s;
    margin-bottom: -1px;
    letter-spacing: 0.02em;
}

.tab-btn:hover {
    color: var(--text-secondary);
}

.tab-btn.active {
    color: var(--brand);
    border-bottom-color: var(--brand);
}

/* Document stats bar */
.doc-stats {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    flex: 1;
}

.stat-card .stat-value {
    font-family: var(--font-mono);
    font-size: 24px;
    font-weight: 700;
    color: var(--brand);
    line-height: 1;
}

.stat-card .stat-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-top: 4px;
    font-family: var(--font-display);
}

/* Category badges */
.badge-hr { background: rgba(134, 163, 151, 0.15); color: var(--brand); }
.badge-sop { background: rgba(212, 160, 23, 0.15); color: var(--warning); }
.badge-safety { background: rgba(192, 57, 43, 0.15); color: var(--danger-light); }
.badge-benefits { background: rgba(39, 174, 96, 0.15); color: var(--success); }
.badge-training { background: rgba(134, 163, 200, 0.15); color: #8fa7c8; }
.badge-general { background: var(--bg-raised); color: var(--text-secondary); }

/* ============================================
   SETUP PAGE
   ============================================ */
.page-setup {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-deepest);
    position: relative;
}

.page-setup::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.3;
    mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .chat-sidebar {
        display: none;
    }

    .chat-messages {
        padding: 16px;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .content-container {
        padding: 16px;
    }

    .page-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .nav-links {
        gap: 2px;
    }

    .nav-user {
        display: none;
    }

    .data-table th:nth-child(3),
    .data-table td:nth-child(3),
    .data-table th:nth-child(4),
    .data-table td:nth-child(4) {
        display: none;
    }

    .doc-stats {
        flex-direction: column;
        gap: 8px;
    }

    .welcome-suggestions {
        padding: 0 8px;
    }

    .chat-welcome h2 {
        font-size: 20px;
    }
}