/* ===========================
   Design System Variables
   Colors are now in colors.css
   =========================== */
:root {
    /* Grid System */
    --max-width: 1320px;
    --content-width: 1200px;
    --grid-columns: 12;
    --grid-gap: 32px;
    
    /* Spacing Scale (8px base) - Assembly Line Style */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 72px;
    --space-xxxl: 112px;
    --space-huge: 160px;
    
    /* Typography */
    --font-primary: "Charter", Georgia, serif;
    --font-display: "Charter", Georgia, serif;
    --font-serif: "Charter", Georgia, serif;
    
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.5rem;     /* 24px */
    --font-size-2xl: 2rem;      /* 32px */
    --font-size-3xl: 3rem;      /* 48px */
    --font-size-4xl: 4rem;      /* 64px */
    
    --line-height-tight: 1.25;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.75;
    
    /* Border Radius - Assembly Line Style */
    --border-radius-sm: 3px;
    --border-radius-md: 4px;
    --border-radius-lg: 6px;
    --border-radius-xl: 8px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================
   Reset & Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Ensure text is selectable */
body, p, h1, h2, h3, h4, h5, h6, span, a, li, div {
    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden; /* Prevent horizontal scroll from full-bleed */
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-secondary);
    background-color: var(--color-background);
    min-height: 100vh;
    overflow-x: hidden;
    font-weight: 400;
    letter-spacing: 0.01em;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: var(--line-height-tight);
    letter-spacing: -0.015em;
    color: var(--color-text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: all var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===========================
   Navigation - Assembly Line Style
   =========================== */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    /* background-color: rgba(254, 253, 251, 0.95); */
    background-color: #FFFFFF;
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color-light);
    z-index: 1000;
    padding: 0;
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-nav.nav-hidden {
    transform: translateY(-100%);
}

.main-nav.nav-visible {
    transform: translateY(0);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xxl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

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

.nav-brand {
    font-size: 1.125rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--color-text-primary);
}

.nav-meta {
    display: none; /* Hide time/location in main nav */
}

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

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

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--space-xs) 0;
    white-space: nowrap;
    letter-spacing: 0.01em;
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.nav-link.active {
    color: var(--color-text-primary);
    font-weight: 400;
}

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

/* Language Switcher */
.lang-switcher {
    position: relative;
}

.lang-button {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-button:hover {
    background: var(--color-warm-gray-50);
    border-color: var(--color-warm-gray-300);
}

.lang-button::after {
    content: '▼';
    font-size: 10px;
    color: var(--color-text-muted);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--color-warm-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.lang-switcher.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.lang-option:first-child {
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

.lang-option:hover {
    background: var(--color-warm-gray-50);
    color: var(--color-text-primary);
}

.lang-option.active {
    background: var(--color-warm-gray-100);
    color: var(--color-text-primary);
    font-weight: 500;
}

/* User Icon */
.user-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-warm-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-icon:hover {
    background: var(--color-warm-gray-200);
}

.user-icon svg {
    width: 18px;
    height: 18px;
    fill: var(--color-text-secondary);
}

.nav-number {
    display: none;
}

/* ===========================
   Research Page Hero Layout
   =========================== */
.research-hero-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-xxl);
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
}

.research-hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.research-hero-content .page-title {
    text-align: left;
    margin-bottom: var(--space-sm);
}

.research-hero-content .page-description {
    text-align: left;
    max-width: 100%;
    margin-bottom: var(--space-md);
}

/* Research Focus Inline */
.research-focus-inline {
    margin-top: var(--space-lg);
}

.focus-section-title {
    font-size: var(--font-size-xl);
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.focus-item {
    padding: var(--space-md);
    background: var(--color-warm-gray-50);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius-sm);
}

.focus-title {
    font-size: var(--font-size-base);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-text-primary);
}

.focus-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

/* Right Sidebar */
.research-hero-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    position: sticky;
    top: 100px;
}

.research-hero-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    padding: var(--space-lg);
    /* background: var(--color-warm-white); */
    background: #FFFFFF;
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius-lg);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Social Links */
.research-social-links {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    padding: var(--space-md);
    background: var(--color-warm-white);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius-lg);
}

.social-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-warm-gray-50);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.social-icon:hover {
    background: var(--color-text-primary);
    transform: translateY(-2px);
}

.social-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--color-text-secondary);
    transition: fill var(--transition-fast);
}

.social-icon:hover svg {
    fill: var(--color-warm-white);
}

@media (max-width: 768px) {
    .research-hero-layout {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .research-hero-sidebar {
        position: static;
    }
    
    .research-hero-stats {
        flex-direction: row;
        justify-content: space-around;
    }
    
    .stat-value {
        font-size: var(--font-size-2xl);
    }
    
    .research-social-links {
        justify-content: center;
    }
    
    .focus-grid {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Layout Components - Assembly Line Style
   =========================== */
/* .main-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-xxxl) var(--space-xxl);
    padding-top: calc(var(--space-xxxl) + 72px);
    min-height: 100vh;
} */

.main-container {
    max-width: none;
    width: 100%;
    margin: 0 auto;
    padding-left: clamp(16px, 3vw, 56px);
    padding-right: clamp(16px, 3vw, 56px);
  }

  
.page {
    display: none;
    animation: fadeIn var(--transition-slow);
}

.page.active {
    display: block;
}

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

/* ===========================
   Hero Section - Simplified
   =========================== */
.hero {
    text-align: center;
    padding: var(--space-xxl) 0;
    max-width: 900px;
    margin: 0 auto var(--space-huge);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 500;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    max-width: 700px;
    margin: 0 auto;
}

/* ===========================
   Four Card Layout (Homepage)
   =========================== */
.home-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
    margin: var(--space-xxxl) 0;
}

.home-card {
    background: var(--color-warm-white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    transition: all var(--transition-base);
    cursor: pointer;
    min-height: 400px;
}

.home-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-warm-gray-300);
}

.card-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: var(--space-sm);
}

.home-card[data-category="research"] .card-icon {
    background: linear-gradient(135deg, #9CAF88 0%, #7B9BB0 100%);
}

.home-card[data-category="photography"] .card-icon {
    background: linear-gradient(135deg, #D4A59A 0%, #C17767 100%);
}

.home-card[data-category="reading"] .card-icon {
    background: linear-gradient(135deg, #7B9BB0 0%, #9CAF88 100%);
}

.home-card[data-category="development"] .card-icon {
    background: linear-gradient(135deg, #C17767 0%, #D4A59A 100%);
}

.card-category {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    font-weight: 500;
}

.card-title {
    font-size: var(--font-size-2xl);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    line-height: var(--line-height-tight);
}

.card-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.4;
    flex: 1;
}

.card-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color-light);
}

.card-stat {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
}

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

.stat-value {
    color: var(--color-text-primary);
    font-weight: 500;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    font-weight: 500;
    margin-top: var(--space-md);
}

.card-link::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.home-card:hover .card-link::after {
    transform: translateX(4px);
}

/* ===========================
   Page Hero (Inner Pages)
   =========================== */
.page-hero {
    text-align: center;
    margin-bottom: var(--space-xxxl);
    padding: var(--space-xxl) 0;
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: 500;
    margin-bottom: var(--space-md);
}

.page-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* ===========================
   Content Sections
   =========================== */
.content-section {
    margin-bottom: var(--space-xxxl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 500;
    margin-bottom: var(--space-xl);
    text-align: center;
}

/* ===========================
   Cards Grid
   =========================== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.content-card {
    /* background: var(--color-warm-white); */
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    transition: all var(--transition-base);
}

.content-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-warm-gray-300);
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-text-primary);
    color: var(--color-warm-white);
    border: 1px solid var(--color-text-primary);
}

.btn-primary:hover {
    background: var(--color-warm-gray-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--color-warm-gray-50);
    border-color: var(--color-warm-gray-300);
}

/* ===========================
   Footer - Assembly Line Style
   =========================== */
.main-footer {
    border-top: 1px solid var(--border-color-light);
    padding: var(--space-xxl) 0;
    margin-top: var(--space-huge);
    background-color: var(--color-warm-white);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xxl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left span {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    letter-spacing: 0.01em;
}

.footer-link {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    letter-spacing: 0.01em;
}

.footer-link:hover {
    color: var(--color-text-primary);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1200px) {
    :root {
        --font-size-4xl: 3rem;
        --font-size-3xl: 2.25rem;
    }
    
    .home-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2.25rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
    }
    
    .nav-container {
        padding: 0 var(--space-md);
    }
    
    .nav-meta {
        display: none;
    }
    
    .nav-links {
        gap: var(--space-md);
    }
    
    .nav-link .nav-text {
        font-size: var(--font-size-sm);
    }
    
    .main-container {
        padding: var(--space-xxl) var(--space-md);
        padding-top: calc(var(--space-xxl) + 70px);
    }
    
    .hero {
        padding: var(--space-lg) 0;
    }
    
    .home-cards {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .home-card {
        min-height: 320px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--space-sm);
    }
    
    .main-container {
        padding: var(--space-lg) var(--space-sm);
        padding-top: calc(var(--space-lg) + 70px);
    }
}

/* ===========================
   Utility & Effects
   =========================== */

/* Smooth reveal on scroll */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Selection color */
::selection {
    background-color: var(--color-accent-sage);
    color: var(--color-warm-white);
}

::-moz-selection {
    background-color: var(--color-accent-sage);
    color: var(--color-warm-white);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-warm-gray-50);
}

::-webkit-scrollbar-thumb {
    background: var(--color-warm-gray-300);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-warm-gray-400);
}

/* Full Bleed Layout - Assembly Line Style */

/* Break out of centered max-width container to fill viewport width */
.full-bleed {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
}

/* Ensure cards grid respects padding on full bleed sections */
.full-bleed .hero-cards-4 {
    padding: 0 var(--space-xxl);
    max-width: 1600px;
    margin: 0 auto;
}

.full-bleed .latest-section {
    padding-left: var(--space-xxl);
    padding-right: var(--space-xxl);
    max-width: 1600px;
    margin: 0 auto;
}

/* Responsive padding for full bleed sections */
@media (max-width: 1024px) {
    .full-bleed .hero-cards-4,
    .full-bleed .latest-section {
        padding-left: var(--space-xl);
        padding-right: var(--space-xl);
    }
}

@media (max-width: 640px) {
    .full-bleed .hero-cards-4,
    .full-bleed .latest-section {
        padding-left: var(--space-lg);
        padding-right: var(--space-lg);
    }
}