/* ==========================================
   Sina Shahandeh Personal Website
   Earthy, Scientific, Elegant Design
   ========================================== */

/* CSS Variables - Earthy Color Palette */
:root {
    /* Primary earthy colors */
    --color-earth-dark: #2C3E2D;
    /* Deep forest green */
    --color-earth: #4A6741;
    /* Sage green */
    --color-earth-light: #6B8E6B;
    /* Muted green */
    --color-sand: #D4C5A9;
    /* Warm sand */
    --color-sand-light: #E8DFC8;
    /* Light sand */
    --color-cream: #F5F1E8;
    /* Cream background */
    --color-paper: #FDFBF7;
    /* Paper white */
    --color-terracotta: #B5704F;
    /* Terracotta accent */
    --color-terracotta-light: #D4956B;
    /* Light terracotta */
    --color-stone: #7D7567;
    /* Stone gray */
    --color-charcoal: #3D3D3D;
    /* Dark text */
    --color-ink: #1A1A1A;
    /* Darkest text */

    /* Functional colors */
    --bg-primary: var(--color-paper);
    --bg-secondary: var(--color-cream);
    --bg-accent: var(--color-sand-light);
    --text-primary: var(--color-charcoal);
    --text-secondary: var(--color-stone);
    --text-accent: var(--color-earth);
    --accent-primary: var(--color-earth);
    --accent-secondary: var(--color-terracotta);

    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
    --font-serif-body: 'Lora', Georgia, 'Times New Roman', serif;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 8rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-reveal: 800ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(44, 62, 45, 0.05);
    --shadow-md: 0 4px 12px rgba(44, 62, 45, 0.08);
    --shadow-lg: 0 12px 40px rgba(44, 62, 45, 0.12);

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

/* ==========================================
   Dark Theme Variables
   ========================================== */
[data-theme="dark"] {
    /* Dark earthy palette - warm and sophisticated */
    --color-earth-dark: #8FB88B;
    /* Soft sage for dark mode */
    --color-earth: #9DC499;
    /* Lighter sage */
    --color-earth-light: #B8D4B4;
    /* Very light sage */
    --color-sand: #5C5344;
    /* Dark warm brown */
    --color-sand-light: #4A4339;
    /* Darker brown */
    --color-cream: #1E1C19;
    /* Deep warm black */
    --color-paper: #151311;
    /* Deepest background */
    --color-terracotta: #D4956B;
    /* Warm terracotta (brighter) */
    --color-terracotta-light: #E5A87A;
    /* Light terracotta */
    --color-stone: #9A9285;
    /* Light stone */
    --color-charcoal: #E8E4DC;
    /* Light text */
    --color-ink: #F5F1E8;
    /* Lightest text */

    /* Dark functional colors */
    --bg-primary: #151311;
    --bg-secondary: #1E1C19;
    --bg-accent: #2A2722;
    --text-primary: #E8E4DC;
    --text-secondary: #9A9285;
    --text-accent: #9DC499;
    --accent-primary: #9DC499;
    --accent-secondary: #D4956B;

    /* Dark shadows - softer glow effect */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.35);
}

/* Smooth theme transition */
body,
body *:not(.theme-toggle):not(.theme-toggle *) {
    transition: background-color 0.4s ease,
        color 0.4s ease,
        border-color 0.4s ease,
        box-shadow 0.4s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 17px;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

::selection {
    background-color: var(--color-sand);
    color: var(--color-earth-dark);
}

[data-theme="dark"]::selection {
    background-color: var(--color-earth);
    color: var(--bg-primary);
}

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

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

a:hover {
    color: var(--accent-secondary);
}

/* ==========================================
   Typography
   ========================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-ink);
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
}

h4 {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
}

p {
    margin-bottom: var(--space-md);
}

.lead {
    font-size: 1.375rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-earth-dark);
    font-family: var(--font-serif-body);
}

strong {
    font-weight: 600;
    color: var(--color-earth-dark);
}

/* ==========================================
   Container & Layout
   ========================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-2xl) 0;
    position: relative;
}

/* ==========================================
   Navigation
   ========================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: all var(--transition-base);
    background: transparent;
}

.nav.scrolled {
    background: rgba(253, 251, 247, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: var(--space-sm) 0;
}

[data-theme="dark"] .nav.scrolled {
    background: rgba(21, 19, 17, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-earth-dark);
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
}

.nav-logo:hover {
    color: var(--accent-secondary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

.nav-links a {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-secondary);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--color-earth-dark);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-earth-dark);
    transition: all var(--transition-fast);
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--color-sand);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    overflow: hidden;
    margin-left: var(--space-md);
}

.theme-toggle:hover {
    background: var(--color-sand-light);
    border-color: var(--color-earth);
    transform: scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Sun and Moon Icons */
.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    position: absolute;
    width: 20px;
    height: 20px;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-toggle .sun-icon {
    color: var(--color-terracotta);
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.theme-toggle .moon-icon {
    color: var(--color-earth);
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

/* Dark theme icon states */
[data-theme="dark"] .theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: var(--color-sand);
}

[data-theme="dark"] .theme-toggle {
    border-color: var(--color-sand);
}

[data-theme="dark"] .theme-toggle:hover {
    background: var(--color-sand-light);
    border-color: var(--color-terracotta);
}

/* Sun rays animation */
.theme-toggle .sun-icon .sun-ray {
    transform-origin: center;
    transition: transform 0.4s ease;
}

.theme-toggle:hover .sun-icon .sun-ray {
    transform: scale(1.15);
}

/* Nav actions container */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: var(--space-2xl) var(--space-lg);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(212, 197, 169, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(107, 142, 107, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(181, 112, 79, 0.08) 0%, transparent 70%),
        linear-gradient(180deg, var(--color-cream) 0%, var(--bg-primary) 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%234A6741' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

/* Dark theme hero background */
[data-theme="dark"] .hero-bg {
    background:
        radial-gradient(ellipse at 20% 20%, rgba(157, 196, 153, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(212, 149, 107, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(157, 196, 153, 0.04) 0%, transparent 70%),
        linear-gradient(180deg, #1E1C19 0%, #151311 100%);
}

[data-theme="dark"] .hero-bg::before {
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239DC499' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.6;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
}

.hero-portrait {
    margin-bottom: var(--space-xl);
}

.portrait-placeholder {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-sand) 0%, var(--color-sand-light) 100%);
    border: 4px solid var(--color-paper);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-earth);
    letter-spacing: 0.05em;
}

[data-theme="dark"] .portrait-placeholder {
    background: linear-gradient(135deg, #3A3632 0%, #2A2722 100%);
    border-color: var(--bg-secondary);
    color: var(--color-earth);
}

.hero-title {
    font-family: var(--font-serif);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    color: var(--color-ink);
}

.title-line {
    display: inline;
}

.title-suffix {
    font-weight: 400;
    font-style: normal;
    font-size: 0.55em;
    color: var(--color-stone);
    vertical-align: baseline;
}

.hero-subtitle {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-stone);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.hero-tagline {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-style: italic;
    color: var(--color-earth-light);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--color-earth);
    color: var(--color-paper);
}

.btn-primary:hover {
    background: var(--color-earth-dark);
    color: var(--color-paper);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--color-earth);
    color: var(--color-paper);
    transform: translateY(-2px);
}

.hero-social {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
}

.hero-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-sand-light);
    color: var(--color-earth);
    transition: all var(--transition-base);
}

.hero-social a:hover {
    background: var(--color-earth);
    color: var(--color-paper);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-social svg {
    width: 20px;
    height: 20px;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-stone);
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-stone), transparent);
}

/* ==========================================
   Section Headers
   ========================================== */
.section-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-terracotta);
    font-weight: 500;
}

.section-title {
    font-family: var(--font-serif);
    font-weight: 500;
    color: var(--color-earth-dark);
    margin: 0;
}

.section-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--color-sand), transparent);
}

/* ==========================================
   About Section
   ========================================== */
.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.about-text p {
    font-size: 1.0625rem;
    color: var(--text-primary);
}

.about-text .highlight {
    font-family: var(--font-serif-body);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-earth);
    border-left: 3px solid var(--color-terracotta);
    padding-left: var(--space-md);
    margin-top: var(--space-lg);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.stat {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-earth);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ==========================================
   Experience Section
   ========================================== */
.experience-category {
    margin-bottom: var(--space-2xl);
}

.category-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    color: var(--color-earth-dark);
    margin-bottom: var(--space-sm);
}

.category-subtitle {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-stone);
    margin-bottom: var(--space-xl);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--color-sand), var(--color-sand-light), transparent);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--space-xl) + 4px);
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-sand);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--color-sand-light);
    transition: all var(--transition-base);
}

.timeline-item:hover .timeline-marker {
    background: var(--color-earth);
    box-shadow: 0 0 0 3px var(--color-earth-light);
}

.timeline-item.featured .timeline-marker {
    background: var(--color-terracotta);
    box-shadow: 0 0 0 3px var(--color-terracotta-light);
}

.timeline-content {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.timeline-title {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    color: var(--color-earth);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.acquisition-badge {
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-terracotta);
    color: var(--color-paper);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.timeline-role {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-top: var(--space-xs);
}

.timeline-meta {
    text-align: right;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.timeline-location,
.timeline-date {
    display: block;
}

.timeline-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.achievements {
    list-style: none;
    margin: 0;
    padding: 0;
}

.achievements li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-terracotta);
}

.achievements li:last-child {
    margin-bottom: 0;
}

/* Board Grid */
.board-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.board-card {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-earth);
    transition: all var(--transition-base);
}

.board-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.board-card h4 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-earth-dark);
    margin-bottom: var(--space-xs);
}

.board-role {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-terracotta);
    margin-bottom: var(--space-md);
}

.board-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Education Grid */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.education-card {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
}

.education-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-earth), var(--color-terracotta));
}

.degree {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-sand);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.education-card h4 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-earth-dark);
    margin-bottom: var(--space-xs);
}

.institution {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.years {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.education-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Competencies */
.competencies {
    background: var(--color-earth-dark);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--space-xl);
}

.competencies .category-title {
    color: var(--color-paper);
    margin-bottom: var(--space-lg);
}

.competency-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.competency-card {
    background: rgba(255, 255, 255, 0.08);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.competency-card h4 {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-terracotta-light);
    margin-bottom: var(--space-sm);
}

.competency-card p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    line-height: 1.6;
}

/* Dark theme competencies - inverted style */
[data-theme="dark"] .competencies {
    background: linear-gradient(135deg, #2C3E2D 0%, #1E2B1F 100%);
}

[data-theme="dark"] .competencies .category-title {
    color: #F5F1E8;
}

[data-theme="dark"] .competency-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.08);
}

/* ==========================================
   Writings Section
   ========================================== */
.writings {
    background: var(--bg-secondary);
}

.writings-intro {
    font-family: var(--font-serif-body);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-stone);
    margin-bottom: var(--space-xl);
}

.writings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-lg);
}

.writing-card {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.writing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.writing-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-terracotta);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.writing-card h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

.writing-card h3 a {
    color: var(--color-earth-dark);
    transition: color var(--transition-fast);
}

.writing-card h3 a:hover {
    color: var(--color-earth);
}

.writing-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    flex: 1;
    margin-bottom: var(--space-md);
}

.read-more {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-terracotta);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    align-self: flex-start;
}

.read-more:hover {
    color: var(--color-earth);
}

.writings-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ==========================================
   Contact Section
   ========================================== */
.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-family: var(--font-serif-body);
    font-size: 1.375rem;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

a.contact-item:hover {
    background: var(--color-earth);
}

a.contact-item:hover .contact-label,
a.contact-item:hover .contact-value {
    color: var(--color-paper);
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-value {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    color: var(--color-earth-dark);
}

.contact-social {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--color-earth);
    color: var(--color-paper);
    transform: translateY(-2px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--color-earth-dark);
    padding: var(--space-xl) 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.footer-name {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    color: var(--color-paper);
}

.footer-divider {
    color: var(--color-stone);
}

.footer-year {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-stone);
}

.footer-note {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-stone);
    margin: 0;
}

/* ==========================================
   Reveal Animations
   ========================================== */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition:
        opacity var(--transition-reveal),
        transform var(--transition-reveal);
}

/* Animation states - starts visible, animates when scrolled into view */
.reveal.hidden {
    opacity: 0;
    transform: translateY(30px);
}

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

/* Stagger children */
.reveal:nth-child(2) {
    transition-delay: 100ms;
}

.reveal:nth-child(3) {
    transition-delay: 200ms;
}

.reveal:nth-child(4) {
    transition-delay: 300ms;
}

.reveal:nth-child(5) {
    transition-delay: 400ms;
}

.reveal:nth-child(6) {
    transition-delay: 500ms;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .about-stats {
        max-width: 500px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-primary);
        padding: var(--space-lg);
        gap: var(--space-md);
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
        margin-left: var(--space-sm);
    }

    .theme-toggle .sun-icon,
    .theme-toggle .moon-icon {
        width: 18px;
        height: 18px;
    }

    .hero {
        padding: var(--space-xl) var(--space-md);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .section {
        padding: var(--space-xl) 0;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .timeline {
        padding-left: var(--space-lg);
    }

    .timeline::before {
        left: 4px;
    }

    .timeline-marker {
        left: calc(-1 * var(--space-lg) + 1px);
    }

    .timeline-header {
        flex-direction: column;
    }

    .timeline-meta {
        text-align: left;
    }

    .board-grid,
    .education-grid,
    .writings-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-social {
        flex-direction: column;
        align-items: center;
    }

    .social-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .portrait-placeholder {
        width: 120px;
        height: 120px;
        font-size: 2.5rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .section-line {
        width: 100%;
    }

    .stat-number {
        font-size: 2rem;
    }

    .competency-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {

    .nav,
    .scroll-indicator,
    .hero-cta,
    .hero-social,
    .writings-cta,
    .contact-social {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: var(--space-lg);
    }

    .section {
        padding: var(--space-lg) 0;
        break-inside: avoid;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}