/* ===== CSS Variables ===== */
:root {
    --color-bg: #fdfcfa;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-accent: #2d5a27;
    --color-accent-light: #d4e5d1;
    --color-highlight: #e8f5e6;
    --color-border: #e5e5e5;
    --color-header-bg: rgba(253, 252, 250, 0.95);
    --color-header-bg-scroll: rgba(253, 252, 250, 0.98);
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-strong: rgba(0, 0, 0, 0.15);
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --max-width: 1200px;
    --border-radius: 16px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Dark Mode ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #121212;
        --color-text: #f0f0f0;
        --color-text-muted: #a0a0a0;
        --color-accent: #4a9a42;
        --color-accent-light: #2a4a26;
        --color-highlight: #1a2a18;
        --color-border: #333333;
        --color-header-bg: rgba(18, 18, 18, 0.95);
        --color-header-bg-scroll: rgba(18, 18, 18, 0.98);
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-shadow-strong: rgba(0, 0, 0, 0.5);
    }
}

/* Manual dark mode toggle */
[data-theme="dark"] {
    --color-bg: #121212;
    --color-text: #f0f0f0;
    --color-text-muted: #a0a0a0;
    --color-accent: #4a9a42;
    --color-accent-light: #2a4a26;
    --color-highlight: #1a2a18;
    --color-border: #333333;
    --color-header-bg: rgba(18, 18, 18, 0.95);
    --color-header-bg-scroll: rgba(18, 18, 18, 0.98);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-strong: rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --color-bg: #fdfcfa;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-accent: #2d5a27;
    --color-accent-light: #d4e5d1;
    --color-highlight: #e8f5e6;
    --color-border: #e5e5e5;
    --color-header-bg: rgba(253, 252, 250, 0.95);
    --color-header-bg-scroll: rgba(253, 252, 250, 0.98);
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-strong: rgba(0, 0, 0, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem var(--spacing-lg);
    background: var(--color-header-bg);
    backdrop-filter: blur(10px);
    max-width: var(--max-width);
    margin: 0 auto;
    transition: var(--transition);
}

.header-logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 48px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(45, 90, 39, 0.15));
    cursor: pointer;
    transition: var(--transition);
}

.logo-img:hover {
    transform: scale(1.05) rotate(5deg);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-cta {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.75rem;
    background: var(--color-text);
    color: var(--color-bg);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.header-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.header-cta:hover::before {
    left: 100%;
}

.header-cta:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(45, 90, 39, 0.3);
}

/* ===== Dark Mode Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    margin-right: var(--spacing-sm);
}

.theme-toggle:hover {
    border-color: var(--color-text);
    background: var(--color-shadow);
    transform: translateY(-2px);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--color-text);
    transition: var(--transition);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon,
html:not([data-theme]) .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon,
html:not([data-theme]) .theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme]) .theme-toggle .sun-icon {
        display: block;
    }

    html:not([data-theme]) .theme-toggle .moon-icon {
        display: none;
    }
}

/* ===== Hero Section ===== */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    padding-top: var(--spacing-lg);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    line-height: 1.2;
    max-width: 900px;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-title em {
    font-style: italic;
    color: var(--color-accent);
}

.hero-title .highlight {
    background: linear-gradient(180deg, transparent 60%, var(--color-accent-light) 60%);
    padding: 0 0.35rem;
    color: var(--color-accent);
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
}

.hero-title .highlight:hover {
    background: linear-gradient(180deg, transparent 50%, var(--color-accent-light) 50%);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 650px;
    line-height: 1.75;
    font-weight: 400;
}

/* ===== Projects Section ===== */
.projects {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    padding-bottom: var(--spacing-xl);
}

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

.section-label {
    display: inline-flex;
    align-items: center;
    padding: 0.6rem 1.5rem;
    background: transparent;
    border: 1.5px solid var(--color-text);
    border-radius: 50px;
    font-family: var(--font-serif);
    font-size: 1rem;
    cursor: default;
    transition: var(--transition);
}

.section-label:hover {
    background: var(--color-text);
    color: var(--color-bg);
    transform: translateY(-2px);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 2rem;
}

.project-card {
    position: relative;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-image {
    aspect-ratio: 4/3;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px var(--color-shadow);
    transition: var(--transition);
}

.project-card:hover .project-image {
    box-shadow: 0 12px 40px var(--color-shadow-strong);
    transform: scale(1.02);
}

.project-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    width: 70%;
    max-width: 200px;
    transition: var(--transition);
}

.project-card:hover .project-preview {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.2);
}

.project-icon {
    font-size: 3rem;
    transition: var(--transition);
}

.project-card:hover .project-icon {
    transform: scale(1.1) rotate(5deg);
}

.project-ui {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.ui-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 3px;
    width: 70%;
    transition: var(--transition);
}

.project-card:hover .ui-bar {
    width: 80%;
    background: rgba(255, 255, 255, 0.8);
}

.ui-dots {
    display: flex;
    gap: 6px;
}

.ui-dots span {
    width: 10px;
    height: 10px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    transition: var(--transition);
}

.project-card:hover .ui-dots span {
    background: rgba(255, 255, 255, 0.9);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.ui-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
}

.ui-grid span {
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 4px;
    transition: var(--transition);
}

.project-card:hover .ui-grid span {
    background: rgba(255, 255, 255, 0.8);
}

.ui-wave {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 28px;
}

.ui-wave span {
    width: 8px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 2px;
    transition: var(--transition);
}

.project-card:hover .ui-wave span {
    animation: wave 1s ease-in-out infinite;
}

@keyframes wave {
    0%, 100% { height: 40%; }
    50% { height: 90%; }
}

.ui-wave span:nth-child(1) { height: 40%; animation-delay: 0s; }
.ui-wave span:nth-child(2) { height: 70%; animation-delay: 0.1s; }
.ui-wave span:nth-child(3) { height: 50%; animation-delay: 0.2s; }
.ui-wave span:nth-child(4) { height: 90%; animation-delay: 0.3s; }
.ui-wave span:nth-child(5) { height: 60%; animation-delay: 0.4s; }

.ui-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 32px;
}

.ui-chart span {
    width: 18px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 3px;
    transition: var(--transition);
}

.project-card:hover .ui-chart span {
    animation: chart-grow 0.6s ease-out;
}

@keyframes chart-grow {
    0% { transform: scaleY(0); }
    100% { transform: scaleY(1); }
}

.ui-chart span:nth-child(1) { height: 50%; }
.ui-chart span:nth-child(2) { height: 75%; }
.ui-chart span:nth-child(3) { height: 100%; }

.ui-molecule {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.ui-molecule span {
    width: 18px;
    height: 18px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    transition: var(--transition);
}

.project-card:hover .ui-molecule span {
    animation: orbit 2s infinite;
}

@keyframes orbit {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.ui-funnel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.ui-funnel span {
    height: 6px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 3px;
    transition: var(--transition);
}

.ui-funnel span:nth-child(1) { width: 100%; }
.ui-funnel span:nth-child(2) { width: 70%; }
.ui-funnel span:nth-child(3) { width: 40%; }

.project-content {
    padding: 0.5rem 0;
}

.project-card h3 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
    transition: var(--transition);
}

.project-card:hover h3 {
    color: var(--color-accent);
}

.project-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== Adventures Header ===== */
.adventures-header {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-lg);
    display: flex;
    justify-content: flex-end;
}

.adventures-decoration {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.arrow-doodle {
    width: 100px;
    height: 50px;
    color: var(--color-text);
    opacity: 0.7;
    animation: draw-arrow 2s ease-in-out infinite;
}

@keyframes draw-arrow {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 0.4; }
}

.adventures-text {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-style: italic;
    opacity: 0.9;
    letter-spacing: -0.02em;
}

/* ===== Timeline Section ===== */
.timeline {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    padding-bottom: var(--spacing-xl);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1.5fr 1fr auto;
    gap: var(--spacing-md);
    padding: 1.75rem 0;
    border-bottom: 1px solid var(--color-border);
    align-items: center;
    transition: var(--transition);
    opacity: 0;
    transform: translateX(-20px);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item:hover {
    padding-left: var(--spacing-sm);
    border-bottom-color: var(--color-accent);
}

.timeline-item:hover .timeline-role {
    color: var(--color-accent);
}

.timeline-role {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: -0.01em;
    transition: var(--transition);
}

.timeline-company {
    font-size: 1.05rem;
    color: var(--color-text-muted);
}

.timeline-year {
    font-size: 1rem;
    color: var(--color-text-muted);
    text-align: right;
    font-weight: 500;
}

/* ===== Back to Top ===== */
.back-to-top-container {
    display: flex;
    justify-content: center;
    padding: var(--spacing-lg) 0;
}

.back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.back-to-top:hover {
    border-color: var(--color-text);
    color: var(--color-text);
    background: var(--color-shadow);
}

.arrow-up {
    transition: var(--transition);
    font-size: 1.2rem;
}

.back-to-top:hover .arrow-up {
    transform: translateY(-3px);
}

/* ===== About Section ===== */
.about {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(180deg, transparent 0%, var(--color-highlight) 100%);
    border-radius: var(--border-radius);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-lg);
}

.about-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 400;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.about-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.about-text p {
    margin-bottom: var(--spacing-sm);
}

.doodle-decoration {
    margin-top: var(--spacing-md);
}

.squiggle {
    width: 120px;
    height: 24px;
    color: var(--color-text);
    opacity: 0.4;
    animation: squiggle 3s ease-in-out infinite;
}

@keyframes squiggle {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(5px); }
}

/* ===== Footer ===== */
.footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    padding-top: 0;
}

.footer-divider {
    height: 2px;
    background: repeating-linear-gradient(
        90deg,
        var(--color-text) 0,
        var(--color-text) 8px,
        transparent 8px,
        transparent 16px
    );
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
}

.footer-statement {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 10vw, 6.5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
}

.footer-statement em {
    font-style: italic;
    color: var(--color-accent);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1rem;
    position: relative;
    padding-bottom: 2px;
    transition: var(--transition);
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.footer-links a:hover {
    color: var(--color-accent);
}

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

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .about-title {
        grid-column: span 2;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 4rem;
    }
    
    .header {
        padding: 1.25rem var(--spacing-md);
    }
    
    .logo-img {
        height: 40px;
    }
    
    .header-cta {
        padding: 0.65rem 1.25rem;
        font-size: 0.85rem;
    }
    
    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .projects {
        padding: 0 var(--spacing-md);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .timeline {
        padding: 0 var(--spacing-md);
    }
    
    .timeline-item {
        grid-template-columns: 1fr;
        gap: 0.25rem;
        padding: 1.5rem 0;
    }
    
    .timeline-year {
        text-align: left;
    }
    
    .about {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .about-title {
        grid-column: span 1;
    }
    
    .adventures-header {
        justify-content: center;
        padding: var(--spacing-md);
    }
    
    .footer {
        padding: var(--spacing-md);
    }
    
    .footer-links {
        gap: var(--spacing-md);
    }
}

/* ===== Selection Styles ===== */
::selection {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

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

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* ===== Smooth Animations ===== */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger animation delays */
.hero-title { animation: fade-in-up 0.8s ease-out 0.1s backwards; }
.hero-description { animation: fade-in-up 0.8s ease-out 0.2s backwards; }
.section-label { animation: fade-in-up 0.8s ease-out 0.3s backwards; }

.project-card:nth-child(1) { animation: fade-in-up 0.8s ease-out 0.4s backwards; }
.project-card:nth-child(2) { animation: fade-in-up 0.8s ease-out 0.5s backwards; }
.project-card:nth-child(3) { animation: fade-in-up 0.8s ease-out 0.6s backwards; }
.project-card:nth-child(4) { animation: fade-in-up 0.8s ease-out 0.7s backwards; }
.project-card:nth-child(5) { animation: fade-in-up 0.8s ease-out 0.8s backwards; }
.project-card:nth-child(6) { animation: fade-in-up 0.8s ease-out 0.9s backwards; }

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}