/* 
=====================================================
PERSONAL PORTFOLIO - STYLESHEET
=====================================================
A clean, professional design system with muted 
corporate aesthetics. Uses CSS custom properties 
for easy theming and maintenance.

TABLE OF CONTENTS:
1. CSS Variables & Reset
2. Typography
3. Layout Utilities
4. Header & Navigation
5. Hero Section
6. About Section
7. Experience/Timeline Section
8. Contact Section
9. Footer
10. Animations
11. Media Queries
=====================================================
*/

/* 
=====================================================
1. CSS VARIABLES & RESET
=====================================================
*/
:root {
    /* Color Palette - Muted Corporate */
    --color-bg: #FAFAF9;
    --color-bg-alt: #F5F4F2;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #5C5C5C;
    --color-text-muted: #8A8A8A;
    --color-accent: #2C3E50;
    --color-accent-hover: #1A252F;
    --color-accent-light: #E8ECF0;
    --color-border: #E5E5E3;
    --color-border-dark: #D1D1CF;

    /* Typography Scale */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;
    --text-6xl: 4.5rem;

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    --header-height: 80px;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

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

ul, ol {
    list-style: none;
}

button {
    background: none;
    border: none;
    cursor: pointer;
}

/* 
=====================================================
2. TYPOGRAPHY
=====================================================
*/
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-text-primary);
}

.section-label {
    display: block;
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

/* 
=====================================================
3. LAYOUT UTILITIES
=====================================================
*/
.section-container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* 
=====================================================
4. HEADER & NAVIGATION
=====================================================
*/
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(250, 250, 249, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: border-color var(--transition-base), background var(--transition-base);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-accent);
    transition: opacity var(--transition-fast);
}

.nav-logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: var(--space-2) var(--space-5);
    background: var(--color-accent);
    color: var(--color-surface) !important;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast) !important;
}

.nav-cta:hover {
    background: var(--color-accent-hover) !important;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 32px;
    height: 32px;
    padding: 4px;
}

.nav-toggle-bar {
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
    transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child {
    transform: translateY(-4px) rotate(-45deg);
}

/* 
=====================================================
5. HERO SECTION
=====================================================
*/
.hero {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100vh;
    padding: var(--header-height) var(--space-6) var(--space-16);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
    text-align: center;
}

.hero-greeting {
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.2s;
}

.hero-name {
    font-size: clamp(var(--text-4xl), 8vw, var(--text-6xl));
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-3);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.35s;
}

.hero-role {
    font-family: var(--font-display);
    font-size: clamp(var(--text-xl), 3vw, var(--text-2xl));
    font-weight: 400;
    font-style: italic;
    color: var(--color-accent);
    margin-bottom: var(--space-6);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.5s;
}

.hero-tagline {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 540px;
    margin: 0 auto var(--space-10);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.65s;
}

.hero-cta {
    display: inline-block;
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-surface);
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), transform var(--transition-fast);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.8s;
}

.hero-cta:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    opacity: 0;
    animation: fadeIn 0.6s ease forwards;
    animation-delay: 1.2s;
}

.hero-scroll-indicator span {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(180deg, var(--color-text-muted) 0%, transparent 100%);
    animation: scrollPulse 2s ease-in-out infinite;
}

/* 
=====================================================
6. ABOUT SECTION
=====================================================
*/
.about {
    padding: var(--space-24) 0;
    background: var(--color-surface);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: center;
}

@media (min-width: 900px) {
    .about-grid {
        grid-template-columns: 380px 1fr;
        gap: var(--space-16);
    }
}

/* About Image */
.about-image-wrapper {
    position: relative;
    justify-self: center;
}

.about-image {
    position: relative;
    width: 280px;
    height: 350px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    overflow: hidden;
    z-index: 1;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    width: 100%;
    height: 100%;
    color: var(--color-text-muted);
}

.about-image-placeholder svg {
    width: 64px;
    height: 64px;
    opacity: 0.5;
}

.about-image-placeholder span {
    font-size: var(--text-sm);
    font-weight: 500;
}

.about-image-accent {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    width: 100%;
    height: 100%;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-md);
    opacity: 0.3;
}

/* About Content */
.about-heading {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    margin-bottom: var(--space-6);
}

.about-text {
    margin-bottom: var(--space-8);
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

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

/* About Highlights */
.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.about-highlights li {
    text-align: center;
}

.highlight-number {
    display: block;
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.highlight-label {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 
=====================================================
7. EXPERIENCE / TIMELINE SECTION
=====================================================
*/
.experience {
    padding: var(--space-24) 0;
    background: var(--color-bg);
}

.experience-header {
    max-width: var(--container-narrow);
    margin-bottom: var(--space-12);
}

.experience-heading {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    margin-bottom: var(--space-6);
}

.experience-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.expand-toggle {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    transition: opacity var(--transition-fast);
}

.expand-toggle:hover {
    opacity: 0.7;
}

.control-divider {
    color: var(--color-border-dark);
}

/* Timeline */
.timeline {
    position: relative;
    max-width: var(--container-narrow);
}

/* Timeline Item */
.timeline-item {
    display: grid;
    grid-template-columns: 24px 1fr;
    gap: var(--space-6);
    padding-bottom: var(--space-8);
}

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

/* Timeline Marker */
.timeline-marker {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--color-surface);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    flex-shrink: 0;
    transition: background var(--transition-fast);
}

.timeline-item[data-expanded="true"] .timeline-dot {
    background: var(--color-accent);
}

.timeline-line {
    flex: 1;
    width: 2px;
    background: var(--color-border);
    margin-top: var(--space-2);
}

/* Timeline Content */
.timeline-content {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

.timeline-item[data-expanded="true"] .timeline-content {
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
    padding: var(--space-6);
    text-align: left;
    transition: background var(--transition-fast);
}

.timeline-header:hover {
    background: var(--color-bg);
}

.timeline-header-main {
    flex: 1;
}

.timeline-dates {
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.timeline-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

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

.timeline-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    margin-left: var(--space-4);
    transition: background var(--transition-fast);
}

.timeline-toggle svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
}

.timeline-item[data-expanded="true"] .timeline-toggle svg {
    transform: rotate(45deg);
}

/* Timeline Details (Expandable) */
.timeline-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.timeline-item[data-expanded="true"] .timeline-details {
    max-height: 600px;
    padding: 0 var(--space-6) var(--space-6);
}

.timeline-summary {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
}

.timeline-achievements {
    margin-bottom: var(--space-4);
}

.timeline-achievements li {
    position: relative;
    padding-left: var(--space-5);
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.timeline-achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--color-accent-light);
    border-radius: 50%;
}

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

/* Tags */
.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.tag {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-accent);
    background: var(--color-accent-light);
    border-radius: var(--radius-sm);
}

/* Experience CTA */
.experience-cta {
    max-width: var(--container-narrow);
    margin-top: var(--space-12);
    text-align: center;
}

.download-resume {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-surface);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.download-resume svg {
    width: 18px;
    height: 18px;
}

.download-resume:hover {
    background: var(--color-accent);
    color: var(--color-surface);
}

/* 
=====================================================
8. CONTACT SECTION
=====================================================
*/
.contact {
    padding: var(--space-24) 0;
    background: var(--color-surface);
    text-align: center;
}

.contact .section-container {
    max-width: var(--container-narrow);
}

.contact-heading {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    margin-bottom: var(--space-4);
}

.contact-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
}

.contact-email {
    font-family: var(--font-display);
    font-size: clamp(var(--text-xl), 3vw, var(--text-2xl));
    font-weight: 500;
    color: var(--color-accent);
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast);
}

.contact-email:hover {
    border-bottom-color: var(--color-accent);
}

.contact-social {
    display: flex;
    gap: var(--space-4);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-text-muted);
    background: var(--color-bg);
    border-radius: 50%;
    transition: color var(--transition-fast), background var(--transition-fast);
}

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

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

/* 
=====================================================
9. FOOTER
=====================================================
*/
.site-footer {
    padding: var(--space-8) 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.site-footer p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-align: center;
}

/* 
=====================================================
10. ANIMATIONS
=====================================================
*/
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes scrollPulse {
    0%, 100% { opacity: 0.5; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.1); }
}

/* Section reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 
=====================================================
11. MEDIA QUERIES
=====================================================
*/

/* Tablet */
@media (max-width: 900px) {
    :root {
        --header-height: 70px;
    }

    .about-highlights {
        gap: var(--space-4);
    }

    .highlight-number {
        font-size: var(--text-2xl);
    }
}

/* Mobile */
@media (max-width: 640px) {
    :root {
        --header-height: 64px;
    }

    .section-container {
        padding: 0 var(--space-4);
    }

    /* Mobile Navigation */
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: var(--space-4);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-cta {
        border-radius: 0 !important;
        text-align: center;
    }

    .nav-toggle {
        display: flex;
    }

    /* Hero Mobile */
    .hero {
        padding-bottom: var(--space-24);
    }

    .hero-scroll-indicator {
        display: none;
    }

    /* About Mobile */
    .about {
        padding: var(--space-16) 0;
    }

    .about-image {
        width: 220px;
        height: 275px;
    }

    .about-highlights {
        grid-template-columns: 1fr;
        gap: var(--space-4);
        text-align: left;
    }

    .about-highlights li {
        display: flex;
        align-items: baseline;
        gap: var(--space-3);
    }

    .highlight-number {
        font-size: var(--text-2xl);
        margin-bottom: 0;
    }

    /* Timeline Mobile */
    .experience {
        padding: var(--space-16) 0;
    }

    .timeline-item {
        grid-template-columns: 16px 1fr;
        gap: var(--space-4);
    }

    .timeline-dot {
        width: 10px;
        height: 10px;
    }

    .timeline-header {
        padding: var(--space-4);
    }

    .timeline-toggle {
        width: 28px;
        height: 28px;
    }

    .timeline-item[data-expanded="true"] .timeline-details {
        padding: 0 var(--space-4) var(--space-4);
    }

    /* Contact Mobile */
    .contact {
        padding: var(--space-16) 0;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .hero-greeting,
    .hero-name,
    .hero-role,
    .hero-tagline,
    .hero-cta,
    .hero-scroll-indicator {
        opacity: 1;
        animation: none;
    }
}

/* Print Styles */
@media print {
    .site-header,
    .hero-scroll-indicator,
    .nav-toggle,
    .experience-controls,
    .timeline-toggle,
    .contact-social {
        display: none !important;
    }

    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }

    .hero {
        min-height: auto;
        padding: 2cm 0;
    }

    .timeline-details {
        max-height: none !important;
        padding: 1em !important;
    }

    a {
        text-decoration: underline;
    }

    .contact-email::after {
        content: " (" attr(href) ")";
    }
}