/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f8f8f8;
    --color-text: #282828;
    --color-text-secondary: #504945;
    --color-text-tertiary: #676767;
    --color-accent: #282828;
    --color-accent-light: #f0f0f0;
    --color-border: #e5e5e5;
    --color-card-bg: #fff;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 960px;
    --nav-height: 64px;
    --radius: 8px;
    --transition: 0.2s ease;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-serif);
    font-size: 17px;
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-text);
}

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

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 96px 0;
}

.section-alt {
    background-color: var(--color-bg-alt);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 48px;
    color: var(--color-text);
    position: relative;
    padding-bottom: 12px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-accent);
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: border-color var(--transition), background var(--transition);
}

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

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

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

.nav-links {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: -0.01em;
    transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition), opacity var(--transition);
}

/* ========================================
   Hero
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
}

.hero-content {
    max-width: 600px;
}

.hero-greeting {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.highlight {
    color: var(--color-accent);
    font-weight: 500;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

.hero-links {
    display: flex;
    gap: 16px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.social-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

/* ========================================
   Metrics
   ======================================== */
.metrics {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--color-border);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 48px;
}

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

.metric-number {
    display: block;
    font-family: var(--font-sans);
    font-size: 2.75rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1;
    color: var(--color-text);
    margin-bottom: 8px;
}

.metric-label {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-text-tertiary);
    letter-spacing: 0.01em;
}

.logos-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.logos-label {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

.logos-list {
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-tertiary);
    opacity: 0.75;
    transition: opacity var(--transition);
    white-space: nowrap;
}

.logo-item:hover {
    opacity: 1;
}

.logo-icon {
    flex-shrink: 0;
}

.google-letters {
    font-size: 17px;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.deloitte-dot {
    color: #86BC25;
    font-weight: 700;
}

.gt-mark {
    color: #B3A369;
    font-weight: 700;
    letter-spacing: -0.02em;
}

@media (max-width: 768px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .logos-strip {
        flex-direction: column;
        gap: 16px;
    }

    .logos-list {
        gap: 24px;
    }
}

/* ========================================
   About
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding-top: 4px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.detail-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.detail-value {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
}

/* ========================================
   Experience Timeline
   ======================================== */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 8px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-accent);
}

.timeline-item:first-child .timeline-marker {
    background: var(--color-accent);
}

.timeline-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.timeline-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.timeline-company {
    font-size: 0.95rem;
    color: var(--color-accent);
    font-weight: 500;
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-bottom: 8px;
    display: block;
}

.timeline-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ========================================
   Publications
   ======================================== */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.publication-card {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
}

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

.publication-card:last-child {
    border-bottom: none;
}

.publication-year {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    padding-top: 2px;
}

.publication-info h3 {
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
    line-height: 1.4;
}

.publication-info h3 a {
    color: var(--color-text);
    transition: color 0.2s ease;
}

.publication-info h3 a:hover {
    color: #2563eb;
}

.publication-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.publication-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-accent-light);
    padding: 3px 10px;
    border-radius: 100px;
    margin-right: 6px;
}

/* ========================================
   Projects
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--transition);
}

.project-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.project-icon {
    color: var(--color-accent);
    margin-bottom: 16px;
}

.project-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.project-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.project-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

/* ========================================
   Blog
   ======================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.blog-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--transition);
}

.blog-card:hover {
    border-color: var(--color-accent);
}

.blog-date {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    display: block;
    margin-bottom: 8px;
}

.blog-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.blog-card h3 a {
    color: var(--color-text);
}

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

.blog-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.blog-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-accent-light);
    padding: 2px 8px;
    border-radius: 100px;
    margin-right: 4px;
}

.blog-card-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    border-style: dashed;
}

.blog-coming-soon {
    text-align: center;
    color: var(--color-text-tertiary);
}

.blog-coming-soon svg {
    margin: 0 auto 8px;
}

.blog-coming-soon p {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ========================================
   Contact
   ======================================== */
.contact-content {
    max-width: 480px;
}

.contact-description {
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition);
}

.contact-link:hover {
    color: var(--color-accent);
}

.contact-link svg {
    flex-shrink: 0;
    color: var(--color-text-tertiary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
}

.footer p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

/* ========================================
   Hero Reveal Animation
   ======================================== */
.hero-reveal {
    opacity: 0;
    transform: translateY(30px);
    animation: heroReveal 0.8s ease forwards;
}

.hero-reveal:nth-child(1) { animation-delay: 0.1s; }
.hero-reveal:nth-child(2) { animation-delay: 0.25s; }
.hero-reveal:nth-child(3) { animation-delay: 0.4s; }
.hero-reveal:nth-child(4) { animation-delay: 0.55s; }
.hero-reveal:nth-child(5) { animation-delay: 0.7s; }

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

/* ========================================
   Resume Button
   ======================================== */
.hero-resume-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border: 1px solid var(--color-text);
    border-radius: 100px;
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: all 0.3s ease;
    margin-left: 8px;
}

.hero-resume-btn:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

.nav-resume {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* ========================================
   Dark Mode Toggle
   ======================================== */
.dark-mode-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    margin-left: 16px;
    flex-shrink: 0;
}

.dark-mode-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-text);
}

.icon-sun {
    display: none;
}

.darkmode .icon-moon {
    display: none;
}

.darkmode .icon-sun {
    display: block;
}

/* ========================================
   Dark Mode Colors
   ======================================== */
.darkmode {
    --color-bg: #1a1a1a;
    --color-bg-alt: #222222;
    --color-text: #e8e6e3;
    --color-text-secondary: #b8b4af;
    --color-text-tertiary: #8a8580;
    --color-accent: #e8e6e3;
    --color-accent-light: #2a2a2a;
    --color-border: #333333;
    --color-card-bg: #222222;
}

.darkmode .nav {
    background: rgba(26, 26, 26, 0.85);
}

.darkmode .nav-links {
    background: rgba(26, 26, 26, 0.98);
}

.darkmode .timeline-marker {
    background: var(--color-bg-alt);
}

.darkmode .timeline-item:first-child .timeline-marker {
    background: var(--color-accent);
}

.darkmode .google-letters span {
    color: var(--color-text-tertiary) !important;
}

.darkmode .deloitte-dot {
    color: #86BC25;
}

.darkmode .gt-mark {
    color: #B3A369;
}

/* ========================================
   Enhanced Hover Effects
   ======================================== */
.blog-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.publication-card {
    border-radius: var(--radius);
    padding-left: 12px;
    padding-right: 12px;
    margin: 0 -12px;
}

.publication-card:hover {
    background: var(--color-bg-alt);
}

.nav-links a {
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-text);
    transition: width 0.3s ease;
}

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

.social-link:hover {
    transform: scale(1.1);
}

.timeline-marker {
    transition: transform var(--transition);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
}

/* ========================================
   Personal Corner
   ======================================== */
.personal-corner {
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
}

.personal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.personal-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    display: block;
    margin-bottom: 12px;
}

.reading-title {
    font-size: 1.05rem;
    font-weight: 600;
    font-style: italic;
    margin-bottom: 4px;
}

.reading-author {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

.quote-text {
    font-size: 1.05rem;
    font-style: italic;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    min-height: 3.2em;
    transition: opacity 0.4s ease;
}

.quote-author {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    font-style: normal;
    transition: opacity 0.4s ease;
}

/* ========================================
   Scroll Animations
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 1.1rem;
    }

    .section {
        padding: 64px 0;
    }

    .section-title {
        margin-bottom: 32px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

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

    .publication-card {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .personal-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-links {
        flex-wrap: wrap;
    }

    .hero-resume-btn {
        margin-left: 0;
    }

    /* Mobile nav */
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links a {
        font-size: 1rem;
    }

    .dark-mode-toggle {
        margin-left: 8px;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }

    .container {
        padding: 0 16px;
    }

    .timeline {
        padding-left: 24px;
    }

    .timeline-marker {
        left: -24px;
    }
}