/* ===================================
   YAP WEN MIN - Personal Website
   Premium, Minimalist, Editorial Design
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-black: #0a0a0a;
    --color-white: #ffffff;
    --color-cream: #f8f7f4;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-400: #a3a3a3;
    --color-gray-600: #525252;
    --color-gray-800: #262626;

    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    --space-3xl: 8rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Layout */
    --max-width: 1400px;
    --nav-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-weight: 300;
    line-height: 1.7;
    color: var(--color-black);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--color-black);
    color: var(--color-white);
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
}

.lead {
    font-size: 1.25rem;
    line-height: 1.8;
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-base);
}

.nav.scrolled {
    border-bottom-color: var(--color-gray-200);
}

.nav-inner {
    max-width: var(--max-width);
    height: 100%;
    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: 500;
    letter-spacing: 0.05em;
}

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

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    position: relative;
    padding: var(--space-xs) 0;
}

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

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

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 1px;
    background-color: var(--color-black);
    transition: var(--transition-base);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 999;
    flex-direction: column;
    gap: var(--space-md);
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    font-size: 1.25rem;
    font-family: var(--font-serif);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-cream) 100%);
}

.hero-content {
    max-width: 900px;
}

.hero-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-gray-600);
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
}

.hero-title {
    font-size: clamp(3rem, 10vw, 7rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.4s;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    color: var(--color-gray-600);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.6s;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.8s;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.2s;
}

.hero-scroll span {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-gray-400);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, var(--color-black) 0%, transparent 100%);
    animation: scrollLine 2s ease infinite;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid var(--color-black);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-gray-800);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-black);
}

.btn-secondary:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* Sections */
.section {
    padding: var(--space-3xl) 0;
}

.section-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-2xl);
}

.section-label {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-gray-400);
    padding-top: 0.5rem;
}

.section-label span:first-child {
    color: var(--color-black);
    font-weight: 500;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-lg);
    max-width: 800px;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-xl);
    max-width: 600px;
}

/* About Section */
.about {
    background-color: var(--color-cream);
}

.about-text {
    max-width: 700px;
    margin-bottom: var(--space-xl);
}

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

.about-text strong {
    font-weight: 500;
}

.about-stats {
    display: flex;
    gap: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-gray-200);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-number {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 500;
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-gray-600);
}

/* Achievements Section */
.achievements {
    background-color: var(--color-white);
}

.achievements .section-content {
    margin-bottom: var(--space-xl);
}

/* Hero Image */
.achievements-hero {
    position: relative;
    width: 100%;
    margin-bottom: var(--space-2xl);
}

.achievements-hero img {
    width: 100%;
    height: auto;
    display: block;
}

.achievements-hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-xl) var(--space-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-stat {
    font-family: var(--font-serif);
    font-size: 4rem;
    font-weight: 500;
    color: var(--color-white);
    line-height: 1;
}

.hero-stat-label {
    font-size: 0.875rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.8);
    margin-top: var(--space-xs);
}

/* Awards Grid */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.achievement-card {
    background-color: var(--color-cream);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.achievement-card:hover {
    border-color: var(--color-black);
    transform: translateY(-4px);
}

.achievement-card.featured {
    background-color: var(--color-black);
    color: var(--color-white);
}

.achievement-card.featured .achievement-card-badge {
    background-color: var(--color-white);
    color: var(--color-black);
}

.achievement-card.featured p {
    color: rgba(255,255,255,0.7);
}

.achievement-card-badge {
    display: inline-block;
    width: fit-content;
    padding: 0.25rem 0.625rem;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background-color: var(--color-black);
    color: var(--color-white);
}

.achievement-card-badge.gold {
    background-color: #c9a227;
}

.achievement-card-badge.silver {
    background-color: #71717a;
}

.achievement-card h3 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 500;
    line-height: 1.3;
}

.achievement-card p {
    font-size: 0.8125rem;
    color: var(--color-gray-600);
    margin-top: auto;
}

/* Leadership Section */
.leadership-section {
    border-top: 1px solid var(--color-gray-200);
    padding-top: var(--space-xl);
}

.leadership-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--space-lg);
    text-align: center;
}

.leadership-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.leadership-grid.expanded {
    grid-template-columns: repeat(3, 1fr);
}

.leadership-card {
    text-align: center;
    padding: var(--space-lg);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

.leadership-card:hover {
    border-color: var(--color-black);
    background-color: var(--color-cream);
}

.leadership-role {
    display: block;
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-gray-400);
    margin-bottom: var(--space-xs);
}

.leadership-org {
    font-family: var(--font-serif);
    font-size: 1.0625rem;
    line-height: 1.4;
}

.leadership-section + .leadership-section {
    margin-top: var(--space-xl);
}

/* Impact Gallery */
.impact-gallery {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 300px 300px auto;
    gap: var(--space-md);
}

/* First image (policy proposal) - larger, spans 2 rows */
.impact-gallery .gallery-item:nth-child(1) {
    grid-column: 1;
    grid-row: 1 / 3;
}

/* Right column images */
.impact-gallery .gallery-item:nth-child(2) {
    grid-column: 2;
    grid-row: 1;
}

.impact-gallery .gallery-item:nth-child(2) img {
    object-position: center 70%;
}

.impact-gallery .gallery-item:nth-child(3) {
    grid-column: 2;
    grid-row: 2;
}

.impact-gallery .gallery-item:nth-child(3) img {
    object-position: center 80%;
}

/* Bottom row - natural aspect ratio */
.impact-gallery .gallery-item:nth-child(4),
.impact-gallery .gallery-item:nth-child(5) {
    grid-row: 3;
    aspect-ratio: 16/9;
}

.impact-gallery .gallery-item:nth-child(4) {
    grid-column: 1;
}

.impact-gallery .gallery-item:nth-child(5) {
    grid-column: 2;
}

.gallery-item {
    position: relative;
    overflow: hidden;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 100%);
    color: var(--color-white);
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.gallery-item:hover .gallery-caption {
    transform: translateY(0);
}

.gallery-tag {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background-color: var(--color-white);
    color: var(--color-black);
    margin-bottom: var(--space-xs);
}

.gallery-caption p {
    font-size: 0.875rem;
    line-height: 1.4;
    margin: 0;
}

@media (max-width: 768px) {
    .impact-gallery {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
        height: auto;
    }
    .impact-gallery .gallery-item {
        grid-column: 1 !important;
        grid-row: auto !important;
        aspect-ratio: 4/3;
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 600px) {
    .hero-stat {
        font-size: 3rem;
    }

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

    .leadership-grid,
    .leadership-grid.expanded {
        grid-template-columns: 1fr;
    }
}

/* Focus Areas / Work Section */
.focus-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.focus-card {
    padding: var(--space-xl);
    background-color: var(--color-cream);
    transition: transform var(--transition-base);
}

.focus-card:hover {
    transform: translateY(-4px);
}

.focus-number {
    font-family: var(--font-serif);
    font-size: 0.875rem;
    color: var(--color-gray-400);
    display: block;
    margin-bottom: var(--space-md);
}

.focus-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.focus-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

/* Publications Section */
.publications {
    background-color: var(--color-cream);
}

.publications-list {
    display: flex;
    flex-direction: column;
}

.publication-item {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-gray-200);
    transition: background-color var(--transition-base);
}

.publication-item:first-child {
    padding-top: 0;
}

.publication-item:hover {
    background-color: rgba(0, 0, 0, 0.02);
    margin: 0 calc(var(--space-md) * -1);
    padding-left: var(--space-md);
    padding-right: var(--space-md);
}

.publication-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.publication-source {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.publication-date {
    font-size: 0.75rem;
    color: var(--color-gray-400);
    letter-spacing: 0.05em;
}

.publication-title {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.publication-title a {
    display: inline-flex;
    align-items: baseline;
    gap: var(--space-sm);
    transition: color var(--transition-base);
}

.publication-title a:hover {
    color: var(--color-gray-600);
}

.arrow-icon {
    width: 1em;
    height: 1em;
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

.publication-title a:hover .arrow-icon {
    transform: translate(4px, -4px);
}

.publication-excerpt {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    max-width: 600px;
}

/* Quote Section */
.quote-section {
    background-color: var(--color-black);
    color: var(--color-white);
    text-align: center;
}

.featured-quote {
    max-width: 900px;
    margin: 0 auto;
}

.featured-quote p {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-style: italic;
    line-height: 1.6;
}

/* Contact Section */
.contact-intro {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-xl);
    max-width: 500px;
}

.contact-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 1rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 400;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.contact-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.contact-btn.linkedin {
    background-color: #0A66C2;
    color: var(--color-white);
}

.contact-btn.linkedin:hover {
    background-color: #004182;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(10, 102, 194, 0.3);
}

.contact-btn.email {
    background-color: var(--color-black);
    color: var(--color-white);
}

.contact-btn.email:hover {
    background-color: var(--color-gray-800);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

@media (max-width: 480px) {
    .contact-buttons {
        flex-direction: column;
    }

    .contact-btn {
        justify-content: center;
    }
}

/* Footer */
.footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-gray-200);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright,
.footer-location {
    font-size: 0.875rem;
    color: var(--color-gray-400);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes scrollLine {
    0%, 100% {
        transform: scaleY(1);
        transform-origin: top;
    }
    50% {
        transform: scaleY(0.5);
        transform-origin: top;
    }
}

/* Scroll Animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

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

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

    .section-label {
        flex-direction: row;
        gap: var(--space-md);
    }

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

@media (max-width: 768px) {
    :root {
        --nav-height: 70px;
    }

    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: var(--space-2xl) var(--space-md);
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .btn {
        width: 100%;
    }

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

    .about-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .footer-inner {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

    .publication-item:hover {
        margin: 0;
        padding-left: 0;
        padding-right: 0;
    }
}

/* Print Styles */
@media print {
    .nav,
    .hero-scroll,
    .hero-cta,
    .contact-links {
        display: none;
    }

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