/* =====================================================
   LLM-BioEval Global Layout System
   ===================================================== */

/* Layout Variables */
:root {
    /* Container Widths */
    --container-standard: 1500px;
    --container-article: 850px;
    --container-wide: 1800px;
    
    /* Consistent Spacing */
    --spacing-page-top: 60px;
    --spacing-section: 48px;
    --spacing-component: 32px;
    --spacing-element: 24px;
    --spacing-small: 16px;
    
    /* Consistent Padding */
    --padding-container: 48px;
    --padding-container-mobile: 24px;
    
    /* Header Heights */
    --navbar-height: 64px;
    --hero-padding-top: 120px;
    --hero-padding-bottom: 80px;
}

/* =====================================================
   Base Container System
   ===================================================== */

/* Standard Container - Used for most content */
.container-standard {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* Article Container - Used for readable content */
.container-article {
    max-width: var(--container-article);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* Wide Container - Used for dashboards/tables */
.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* Full Width Container - Edge to edge with padding */
.container-full {
    width: 100%;
    padding: 0 var(--padding-container);
}

/* =====================================================
   Page Layout Structure
   ===================================================== */

/* Main Content Area - Ensures consistent spacing from navbar */
.page-content {
    padding-top: var(--spacing-page-top);
    min-height: calc(100vh - var(--navbar-height));
}

/* Page Header - Consistent across all pages */
.page-header {
    margin-bottom: var(--spacing-section);
}

.page-header h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.page-header .subtitle {
    font-size: 20px;
    color: var(--gray-600);
    line-height: 1.6;
    max-width: 700px;
}

/* =====================================================
   Hero Headers (Full Width)
   ===================================================== */

.hero-header {
    width: 100%;
    padding: var(--hero-padding-top) 0 var(--hero-padding-bottom);
    background: linear-gradient(135deg, 
        #f8fafc 0%, 
        #f1f5f9 25%, 
        #e2e8f0 50%, 
        #cbd5e1 100%);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 0;
}

.hero-header .hero-content {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* =====================================================
   Article Layout (Two Column)
   ===================================================== */

.article-container {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: var(--spacing-section) var(--padding-container);
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: var(--spacing-component);
    align-items: start;
}

.article-main {
    /* No max-width here, let the content define it */
}

.article-content {
    max-width: var(--container-article);
}

.article-sidebar {
    position: relative;
    top: auto;
    height: auto;
    max-height: none;
    overflow-y: visible;
}

/* =====================================================
   Section Layouts
   ===================================================== */

/* Standard Section */
.section {
    margin-bottom: var(--spacing-section);
}

.section-header {
    margin-bottom: var(--spacing-component);
}

/* Full Width Section Break */
.section-full {
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    padding: var(--spacing-section) 0;
    margin-bottom: var(--spacing-section);
}

.section-full .section-content {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* =====================================================
   Alignment Utilities
   ===================================================== */

/* Ensure navbar brand aligns with page content */
.navbar-inner {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: 0 var(--padding-container);
    height: var(--navbar-height);
    display: flex;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    height: 100%;
    line-height: 1;
}

/* Align footer with page content */
.footer .footer-content {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: 0 var(--padding-container);
}

/* =====================================================
   Responsive Adjustments
   ===================================================== */

@media (max-width: 1200px) {
    .article-container {
        grid-template-columns: 1fr;
    }
    
    .article-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --padding-container: var(--padding-container-mobile);
        --spacing-page-top: 40px;
        --spacing-section: 32px;
        --spacing-component: 24px;
        --hero-padding-top: 80px;
        --hero-padding-bottom: 60px;
    }
    
    .page-header h1 {
        font-size: 36px;
    }
    
    .page-header .subtitle {
        font-size: 18px;
    }
    
    .hero-header .hero-title {
        font-size: 40px;
    }
}

/* =====================================================
   Migration Helpers
   ===================================================== */

/* Map old container class to new system */
.container {
    max-width: var(--container-standard);
    margin: 0 auto;
    padding: var(--spacing-component) var(--padding-container);
}

/* Ensure main-content respects new spacing */
.main-content {
    min-height: calc(100vh - var(--navbar-height));
    padding: 0; /* Remove default padding, use page-content instead */
}

/* =============================
   Sidebar Footnotes
   ============================= */
.footnotes {
  font-size: 13px;
  color: var(--gray-600);
  border-left: 2px solid var(--gray-200);
  padding-left: 16px;
}
.footnote {
  margin-bottom: 12px;
  line-height: 1.5;
}
.footnote-number {
  font-weight: bold;
  color: var(--primary);
  margin-right: 4px;
}
.footnote-ref {
  cursor: pointer;
  color: var(--primary);
  font-size: 0.85em;
  vertical-align: super;
  margin-left: 2px;
}
.footnote-ref:hover {
  text-decoration: underline;
}
.footnote.active, .footnote-ref.active {
  background: #f3f4f6;
  border-radius: 4px;
}

/* Modern Form Controls and Dropdowns */
.modern-form-control {
    position: relative;
    display: inline-block;
    min-width: 200px;
}

.modern-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background: var(--bg-primary);
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    padding: 12px 16px;
    padding-right: 40px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
}

.modern-select:hover {
    border-color: var(--gray-300);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.modern-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.modern-select option {
    background: var(--bg-primary);
    color: var(--gray-700);
    padding: 8px 12px;
    font-size: 14px;
}

.modern-select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Modern Button Group */
.modern-button-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.modern-button {
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    border: 2px solid var(--gray-200);
    background: var(--bg-primary);
    color: var(--gray-600);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.modern-button:hover {
    border-color: var(--gray-300);
    background: var(--gray-50);
    color: var(--gray-700);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.modern-button.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.modern-button.active:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* Modern Form Container */
.modern-form-container {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
    padding: 16px;
    background: var(--gray-50);
    border-radius: 16px;
    border: 1px solid var(--gray-200);
}

.modern-form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
    display: block;
}

/* Modern Select Wrapper */
.modern-select-wrapper {
    position: relative;
    display: inline-block;
}

.modern-select-wrapper::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--gray-400);
    pointer-events: none;
    transition: all 0.2s ease;
}

.modern-select-wrapper:hover::after {
    border-top-color: var(--gray-500);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .modern-form-container {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .modern-form-control {
        min-width: 100%;
    }
    
    .modern-button-group {
        justify-content: center;
    }
    
    .modern-select {
        padding: 14px 16px;
        padding-right: 40px;
        font-size: 16px; /* Prevent zoom on iOS */
    }
}

/* Loading state for dropdowns */
.modern-select.loading {
    opacity: 0.7;
    cursor: wait;
}

.modern-select.loading::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid var(--gray-200);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}