/* =============================================================================
   GMP AI Assistant - Unified Design System
   Style: Accessible & Ethical (Healthcare/Pharmaceutical Focus)
   Colors: Calm Cyan + Health Green
   Typography: Figtree (headings) + Noto Sans SC (body)
   ============================================================================= */

/* -----------------------------------------------------------------------------
   CSS VARIABLES / DESIGN TOKENS
   ----------------------------------------------------------------------------- */
:root {
    /* Primary Colors - Healthcare Cyan Palette */
    --primary-50: #ecfeff;
    --primary-100: #cffafe;
    --primary-200: #a5f3fc;
    --primary-300: #67e8f9;
    --primary-400: #22d3ee;
    --primary-500: #06b6d4;
    --primary-600: #0891b2;
    --primary-700: #0e7490;
    --primary-800: #155e75;
    --primary-900: #164e63;

    /* Accent - Health Green */
    --accent-50: #ecfdf5;
    --accent-100: #d1fae5;
    --accent-400: #34d399;
    --accent-500: #10b981;
    --accent-600: #059669;
    --accent-700: #047857;

    /* Semantic Colors */
    --success-color: #059669;
    --success-bg: #d1fae5;
    --success-text: #065f46;

    --warning-color: #d97706;
    --warning-bg: #fef3c7;
    --warning-text: #78350f;

    --error-color: #dc2626;
    --error-bg: #fee2e2;
    --error-text: #991b1b;

    --info-color: #0891b2;
    --info-bg: #ecfeff;
    --info-text: #164e63;

    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-heading: 'Figtree', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

    /* Focus Ring */
    --focus-ring: 0 0 0 3px rgba(8, 145, 178, 0.4);
    --focus-ring-offset: 0 0 0 2px white;

    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 200ms ease-out;
    --transition-slow: 300ms ease-out;
}

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

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

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gray-100);
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.3;
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-700);
}

a:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--radius-sm);
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-600);
    color: white;
    padding: var(--space-2) var(--space-4);
    z-index: 100;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* -----------------------------------------------------------------------------
   ICONS (SVG)
   ----------------------------------------------------------------------------- */
.icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-lg {
    width: 24px;
    height: 24px;
}

.icon-xl {
    width: 32px;
    height: 32px;
}

/* -----------------------------------------------------------------------------
   BUTTONS
   ----------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring-offset), var(--focus-ring);
}

.btn:disabled,
.btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--primary-600);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-700);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

.btn-accent {
    background: var(--accent-600);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-accent:hover:not(:disabled) {
    background: var(--accent-700);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-600);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
}

/* Button Loading State */
.btn .spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

/* -----------------------------------------------------------------------------
   FORMS
   ----------------------------------------------------------------------------- */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label,
.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.form-input,
.form-textarea,
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
    width: 100%;
    height: 44px;
    padding: 0 var(--space-4);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--gray-700);
    background: white;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-textarea,
.form-group textarea {
    height: auto;
    min-height: 80px;
    padding: var(--space-3) var(--space-4);
    resize: vertical;
}

.form-input:focus,
.form-textarea:focus,
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
}

.form-input::placeholder,
.form-textarea::placeholder,
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group small {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.form-row-flex {
    display: flex;
    gap: var(--space-4);
    align-items: flex-end;
}

.form-row-flex .form-group {
    margin-bottom: 0;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--gray-600);
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-600);
    cursor: pointer;
}

.char-count {
    font-size: 0.75rem;
    color: var(--gray-400);
    text-align: right;
}

/* -----------------------------------------------------------------------------
   ALERTS
   ----------------------------------------------------------------------------- */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: 0.875rem;
    border-left: 4px solid;
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

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

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

.alert-warning {
    background: var(--warning-bg);
    color: var(--warning-text);
    border-left-color: var(--warning-color);
}

.alert-info {
    background: var(--info-bg);
    color: var(--info-text);
    border-left-color: var(--info-color);
}

/* -----------------------------------------------------------------------------
   AUTHENTICATION PAGES
   ----------------------------------------------------------------------------- */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--gray-50) 100%);
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-10);
    border: 1px solid var(--gray-100);
}

.auth-card-wide {
    max-width: 520px;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    border-radius: var(--radius-xl);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    color: white;
}

.auth-logo svg {
    width: 32px;
    height: 32px;
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.auth-footer {
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

.auth-footer p {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: var(--space-2);
}

.auth-footer a {
    color: var(--primary-600);
    font-weight: 600;
}

.auth-footer a:hover {
    color: var(--primary-700);
    text-decoration: underline;
}

/* -----------------------------------------------------------------------------
   ERROR PAGE
   ----------------------------------------------------------------------------- */
.error-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: var(--gray-50);
}

.error-card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-12);
    text-align: center;
    max-width: 480px;
    border: 1px solid var(--gray-100);
}

.error-code {
    font-size: 6rem;
    font-weight: 800;
    color: var(--primary-600);
    line-height: 1;
    margin-bottom: var(--space-4);
    font-family: var(--font-heading);
}

.error-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.error-card p {
    color: var(--gray-500);
    margin-bottom: var(--space-8);
}

/* -----------------------------------------------------------------------------
   DASHBOARD - NAVBAR
   ----------------------------------------------------------------------------- */
.dashboard-nav {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-4) var(--space-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.nav-logo svg {
    width: 22px;
    height: 22px;
}

.nav-brand h1 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-user-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-user-avatar {
    width: 36px;
    height: 36px;
    background: var(--primary-100);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-700);
    font-weight: 600;
    font-size: 0.875rem;
}

.nav-user-name {
    font-size: 0.875rem;
    color: var(--gray-700);
    font-weight: 500;
}

.nav-logout {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    color: var(--gray-500);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-logout:hover {
    background: var(--error-bg);
    color: var(--error-color);
}

.nav-logout:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* -----------------------------------------------------------------------------
   DASHBOARD - MODULE TABS
   ----------------------------------------------------------------------------- */
.module-tabs-wrapper {
    background: white;
    padding: var(--space-4) var(--space-8) 0;
    border-bottom: 1px solid var(--gray-200);
}

.module-tabs {
    display: flex;
    gap: var(--space-1);
    max-width: 1400px;
    overflow-x: auto;
    scrollbar-width: thin;
}

.module-tab {
    padding: var(--space-3) var(--space-5);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    transition: all var(--transition-fast);
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    white-space: nowrap;
}

.module-tab:hover:not(.locked) {
    color: var(--gray-700);
    background: var(--gray-50);
}

.module-tab:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.module-tab.active {
    color: var(--primary-700);
    background: var(--primary-50);
}

.module-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-600);
}

.module-tab.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.module-tab.locked:hover {
    opacity: 0.7;
    background: transparent;
}

.module-tab .icon {
    width: 18px;
    height: 18px;
}

/* -----------------------------------------------------------------------------
   DASHBOARD - MAIN CONTENT
   ----------------------------------------------------------------------------- */
.main-content {
    padding: var(--space-8);
    max-width: 1600px;
    margin: 0 auto;
}

.module-content {
    display: none;
}

.module-content.active {
    display: block;
}

/* -----------------------------------------------------------------------------
   DASHBOARD - EMPTY/LOCKED MODULES
   ----------------------------------------------------------------------------- */
.empty-module,
.locked-module {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--space-16);
    text-align: center;
    box-shadow: var(--shadow-md);
    max-width: 640px;
    margin: 0 auto;
    border: 1px solid var(--gray-100);
}

.empty-module-icon,
.locked-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto var(--space-6);
    background: var(--primary-50);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
}

.empty-module-icon svg,
.locked-icon svg {
    width: 48px;
    height: 48px;
}

.empty-module h2,
.locked-module h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.empty-module p,
.locked-module p {
    color: var(--gray-500);
    margin-bottom: var(--space-2);
}

.locked-module .btn-group {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    margin-top: var(--space-6);
}

/* -----------------------------------------------------------------------------
   DASHBOARD - CHAT MODULE
   ----------------------------------------------------------------------------- */
.chat-module {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 600px;
    max-height: 700px;
    border: 1px solid var(--gray-100);
}

.chat-header {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    padding: var(--space-5) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: white;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.chat-header h2 svg {
    width: 20px;
    height: 20px;
}

.chat-messages {
    flex: 1;
    padding: var(--space-6);
    overflow-y: auto;
    background: var(--gray-50);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.message {
    display: flex;
    gap: var(--space-3);
    max-width: 85%;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message-avatar svg {
    width: 20px;
    height: 20px;
}

.message.user .message-avatar {
    background: var(--primary-600);
    color: white;
}

.message.assistant .message-avatar {
    background: var(--gray-200);
    color: var(--gray-600);
}

.message-content {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-xl);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.message.user .message-content {
    background: var(--primary-600);
    color: white;
    border-radius: var(--radius-xl) var(--radius-sm) var(--radius-xl) var(--radius-xl);
}

.message.assistant .message-content {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm) var(--radius-xl) var(--radius-xl) var(--radius-xl);
}

/* Message body wrapper for content + metadata + copy button */
.message-body {
    flex: 1;
    position: relative;
}

/* Copy button */
.copy-btn {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--space-2);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    color: var(--gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
}

.message:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: white;
    color: var(--primary-600);
    border-color: var(--primary-300);
}

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

/* Message metadata (time, tokens) */
.message-metadata {
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: var(--space-2);
    padding-left: var(--space-4);
    display: flex;
    gap: var(--space-2);
}


.chat-input-area {
    padding: var(--space-4) var(--space-6);
    background: white;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--space-3);
    align-items: flex-end;
}

.chat-input-area textarea {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    resize: none;
    min-height: 44px;
    max-height: 120px;
    font-family: inherit;
    line-height: 1.5;
}

.chat-input-area textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--focus-ring);
}

.chat-input-area .btn {
    height: 44px;
}

/* -----------------------------------------------------------------------------
   DASHBOARD - EVALUATION MODULE
   ----------------------------------------------------------------------------- */
.evaluation-module {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: var(--space-6);
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    min-height: 600px;
    border: 1px solid var(--gray-100);
}

.evaluation-form {
    padding: var(--space-6);
    background: var(--gray-50);
    border-right: 1px solid var(--gray-200);
    overflow-y: auto;
}

.evaluation-form h2 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.evaluation-actions {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.collapsible {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
    overflow: hidden;
}

.collapsible-header {
    padding: var(--space-3) var(--space-4);
    background: white;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition-fast);
}

.collapsible-header:hover {
    background: var(--gray-50);
}

.collapsible-header:focus-visible {
    outline: none;
    box-shadow: inset var(--focus-ring);
}

.collapsible-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.collapsible-icon {
    color: var(--gray-400);
    transition: transform var(--transition-fast);
    width: 16px;
    height: 16px;
}

.collapsible-icon.expanded {
    transform: rotate(90deg);
}

.collapsible-content {
    display: none;
    padding: var(--space-4);
    border-top: 1px solid var(--gray-100);
}

.collapsible-content.show {
    display: block;
}

.evaluation-results {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
}

.result-tabs {
    display: flex;
    gap: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--space-6);
}

.result-tab {
    padding: var(--space-3) 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.result-tab:hover {
    color: var(--gray-700);
}

.result-tab:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.result-tab.active {
    color: var(--primary-600);
    border-bottom-color: var(--primary-600);
}

.result-content {
    flex: 1;
    overflow-y: auto;
}

.score-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.score-badge {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
}

.score-low {
    background: var(--error-bg);
    color: var(--error-text);
}

.score-mid {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.score-high {
    background: var(--success-bg);
    color: var(--success-text);
}

.score-perfect {
    background: var(--primary-100);
    color: var(--primary-700);
    border: 1px solid var(--primary-200);
}

.comment-box {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
    border-left: 3px solid var(--primary-500);
}

.comment-box strong {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.comment-box p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* -----------------------------------------------------------------------------
   LOADING STATES
   ----------------------------------------------------------------------------- */
.loading-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
    text-align: center;
}

.loading-state.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--space-4);
}

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

.empty-state {
    text-align: center;
    padding: var(--space-16);
    color: var(--gray-400);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

/* -----------------------------------------------------------------------------
   FOOTER
   ----------------------------------------------------------------------------- */
.app-footer {
    margin-top: var(--space-8);
    padding: var(--space-6) 0;
    text-align: center;
    color: var(--gray-400);
    font-size: 0.8125rem;
}

.app-footer a {
    color: var(--gray-500);
    text-decoration: none;
}

.app-footer a:hover {
    color: var(--primary-600);
}

/* -----------------------------------------------------------------------------
   RESPONSIVE
   ----------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .evaluation-module {
        grid-template-columns: 1fr;
    }

    .evaluation-form {
        border-right: none;
        border-bottom: 1px solid var(--gray-200);
    }
}

@media (max-width: 768px) {
    .dashboard-nav {
        padding: var(--space-4);
    }

    .main-content {
        padding: var(--space-4);
    }

    .module-tabs-wrapper {
        padding: var(--space-3) var(--space-4) 0;
    }

    .module-tabs {
        gap: 0;
    }

    .module-tab {
        padding: var(--space-2) var(--space-3);
        font-size: 0.8125rem;
    }

    .nav-brand h1 {
        display: none;
    }

    .nav-user-name {
        display: none;
    }
}

@media (max-width: 640px) {
    .auth-card {
        padding: var(--space-6);
    }

    .form-row,
    .form-row-flex {
        flex-direction: column;
        grid-template-columns: 1fr;
    }

    .auth-card-wide {
        max-width: 420px;
    }

    .chat-module {
        min-height: 500px;
        max-height: 600px;
    }

    .evaluation-form,
    .evaluation-results {
        padding: var(--space-4);
    }

    .empty-module,
    .locked-module {
        padding: var(--space-8);
    }
}

/* ========================================
   参考文献展示区域
   ======================================== */
.message-references {
    margin-top: var(--space-2);
    padding-top: var(--space-2);
    border-top: 1px solid var(--gray-200);
    font-size: 0.85rem;
    color: var(--gray-500);
}

.references-label {
    font-weight: 500;
    margin-right: var(--space-1);
}

.reference-item {
    margin-right: var(--space-2);
    cursor: default;
}

.reference-item.clickable {
    color: var(--primary);
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    transition: color 0.2s ease;
}

.reference-item.clickable:hover {
    color: var(--primary-dark);
}

/* ========================================
   参考原文 Modal
   ======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--space-4);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.reference-modal {
    background: white;
    border-radius: var(--radius-lg);
    max-width: 700px;
    width: 100%;
    max-height: calc(100vh - var(--space-8));
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
    color: var(--gray-400);
    border-radius: var(--radius);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

.modal-body {
    padding: var(--space-5);
    overflow-y: auto;
    flex: 1;
}

.ref-source {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px dashed var(--gray-200);
}

.ref-content {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--gray-800);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.modal-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
}

/* Mobile responsive */
@media (max-width: 640px) {
    .modal-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .reference-modal {
        max-height: calc(100vh - var(--space-4));
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--space-3) var(--space-4);
    }
}