/* ==========================================================================
   Design Tokens
   ========================================================================== */

:root {
    --ink: #111111;
    --paper: #ffffff;
    --accent: #111111;
    --accent-light: #444444;
    --muted: #777777;
    --card: #f5f5f5;
    --white: #ffffff;

    --font-serif: 'DM Serif Display', serif;
    --font-sans: 'Outfit', sans-serif;

    --radius-sm: 14px;
    --radius-md: 20px;
    --radius-pill: 100px;

    --max-width: 1200px;
    --transition: 0.3s ease;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.6;
    font-weight: 400;
    overflow-x: hidden;
}

/* Accessibility: visible focus ring */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--ink);
    color: var(--paper);
    border-radius: var(--radius-pill);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    z-index: 200;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 1rem;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 1.25rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid rgba(17, 17, 17, 0.06);
    transition: background var(--transition);
}

.navbar.scrolled { background: rgba(255, 255, 255, 0.95); }

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    color: var(--ink);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links { display: flex; gap: 2rem; align-items: center; }

.nav-links a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color var(--transition);
}

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

.nav-links .cta-link {
    background: var(--ink);
    color: var(--paper);
    padding: 0.6rem 1.4rem;
    border-radius: var(--radius-pill);
    transition: background var(--transition), transform 0.2s;
}

.nav-links .cta-link:hover {
    background: var(--accent);
    color: var(--white);
    transform: translateY(-1px);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2.5rem 4rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero-content { max-width: 800px; }

.hero-tag {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hero-tag::before {
    content: '';
    width: 2rem;
    height: 2px;
    background: var(--accent);
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.8rem, 6vw, 5rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--ink);
    margin-bottom: 1.75rem;
}

.hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--muted);
    max-width: 540px;
    line-height: 1.75;
    margin-bottom: 2.5rem;
    font-weight: 300;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn svg { width: 16px; height: 16px; }

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

.btn-primary:hover {
    background: var(--accent);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(17, 17, 17, 0.2);
}

.btn-outline {
    background: transparent;
    color: var(--ink);
    border: 1.5px solid rgba(26, 26, 26, 0.2);
}

.btn-outline:hover {
    border-color: var(--ink);
    transform: translateY(-2px);
}

/* ==========================================================================
   Shared Section Styles
   ========================================================================== */

.section {
    padding: 6rem 2.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-tag {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-desc {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 560px;
    line-height: 1.7;
    font-weight: 300;
    margin-bottom: 3rem;
}

/* ==========================================================================
   About
   ========================================================================== */

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
    font-weight: 300;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.stat {
    padding: 1.5rem;
    background: var(--card);
    border-radius: 16px;
    text-align: center;
}

.stat-num {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}

/* ==========================================================================
   Skills
   ========================================================================== */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--card);
    border-radius: var(--radius-md);
    padding: 2.25rem;
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    opacity: 0;
    transition: opacity var(--transition);
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(26, 26, 26, 0.08);
}

.skill-card:hover::after { opacity: 1; }

.skill-icon {
    width: 48px;
    height: 48px;
    background: var(--paper);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    font-size: 1.4rem;
}

.skill-card h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
}

.skill-card p {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.65;
    font-weight: 300;
}

/* ==========================================================================
   Experience
   ========================================================================== */

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.experience-card {
    background: var(--card);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}

.experience-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(26, 26, 26, 0.08);
}

.experience-header {
    padding: 1.75rem;
    color: var(--white);
    position: relative;
}

.experience-date {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: rgba(26, 26, 26, 0.35);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-pill);
    display: inline-block;
    margin-bottom: 0.75rem;
}

.experience-header h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    margin-bottom: 0.25rem;
}

.experience-company {
    font-size: 0.88rem;
    font-weight: 300;
    opacity: 0.9;
}

.experience-body { padding: 1.75rem; }

.experience-highlights {
    list-style: none;
    margin-bottom: 1.25rem;
}

.experience-highlights li {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.65;
    font-weight: 300;
    padding-left: 1rem;
    margin-bottom: 0.5rem;
    position: relative;
}

.experience-highlights li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
}

.experience-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.experience-tags span {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.3rem 0.75rem;
    background: var(--paper);
    border-radius: var(--radius-pill);
    color: var(--muted);
}

/* ==========================================================================
   Contact
   ========================================================================== */

.contact-section {
    text-align: center;
    padding: 6rem 2.5rem 8rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

.contact-section .section-desc { margin: 0 auto 2.5rem; }

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.contact-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.75rem;
    border-radius: var(--radius-pill);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--ink);
    border: 1.5px solid rgba(26, 26, 26, 0.15);
    transition: all var(--transition);
}

.contact-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.contact-links a svg { width: 16px; height: 16px; }

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    text-align: center;
    padding: 2rem;
    font-size: 0.8rem;
    color: var(--muted);
    border-top: 1px solid rgba(26, 26, 26, 0.06);
}

/* ==========================================================================
   Divider
   ========================================================================== */

.divider {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2.5rem;
}

.divider hr {
    border: none;
    height: 1px;
    background: rgba(26, 26, 26, 0.08);
}

/* ==========================================================================
   Animations
   ========================================================================== */

.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .fade-up {
        opacity: 1;
        transform: none;
        transition: none;
    }

    html { scroll-behavior: auto; }

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

/* ==========================================================================
   Responsive — Tablet & Mobile
   ========================================================================== */

@media (max-width: 768px) {
    .navbar { padding: 1rem 1.5rem; }
    .nav-links { gap: 1rem; }
    .nav-links a:not(.cta-link) { display: none; }

    .hero { padding: 7rem 1.5rem 3rem; }

    .section { padding: 4rem 1.5rem; }

    .about-grid { grid-template-columns: 1fr; gap: 2rem; }

    .stats-row { grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
    .stat { padding: 1rem; }
    .stat-num { font-size: 1.5rem; }

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

    .contact-section { padding: 4rem 1.5rem 6rem; }
}