* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

:root {
    --bg: #f7f8fb;
    --surface: #ffffff;
    --text: #0f172a;
    --muted: #6b7284;
    --accent: #0ea5e9;
    --accent-rgb: 14, 165, 233;
    --border: rgba(15, 23, 42, 0.08);
    --radius: 14px;
    --card-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
    --transition: 0.35s cubic-bezier(.2,.9,.3,1);
    --gradient-primary: linear-gradient(135deg, #0ea5e9, #2563eb);
    --gradient-surface: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.82));
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

body::before,
body::after {
    content: "";
    position: fixed;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.45;
    pointer-events: none;
    z-index: 0;
}

body::before {
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.25), transparent 60%);
    top: -140px;
    left: -180px;
}

body::after {
    background: radial-gradient(circle, rgba(37, 99, 235, 0.16), transparent 60%);
    bottom: -140px;
    right: -180px;
}

body.dark-mode {
    --bg: #0b0d13;
    --surface: #0f1117;
    --text: #e6edf7;
    --muted: #9aa3b5;
    --accent: #38bdf8;
    --accent-rgb: 56, 189, 248;
    --border: rgba(255, 255, 255, 0.06);
    --gradient-surface: linear-gradient(180deg, rgba(15,17,23,0.9), rgba(15,17,23,0.78));
    --card-shadow: 0 18px 48px rgba(0,0,0,0.42);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), rgba(var(--accent-rgb), 0.6));
    z-index: 1000;
    transition: width 0.1s ease;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    background: var(--gradient-surface);
    border-bottom: 1px solid var(--border);
}

.topbar .inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.logo {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.01em;
    color: var(--text);
}

.topnav {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.topnav a {
    color: var(--muted);
    text-decoration: none;
    padding: 0.5rem 0.8rem;
    border-radius: 999px;
    transition: background var(--transition), color var(--transition);
    border: 1px solid transparent;
}

.topnav a:hover {
    color: var(--text);
    background: rgba(var(--accent-rgb), 0.08);
    border-color: rgba(var(--accent-rgb), 0.12);
}

header {
    max-width: 1100px;
    margin: 0 auto;
    padding: 5rem 1.5rem 3rem;
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-grid {
    display: grid;
    gap: 1.6rem;
    align-items: center;
}

.hero-main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--muted);
    background: rgba(var(--accent-rgb), 0.05);
    font-size: 0.9rem;
}

.pill-accent {
    color: #0a4d7a;
    background: rgba(var(--accent-rgb), 0.12);
    border-color: rgba(var(--accent-rgb), 0.18);
}

.pill-soft {
    background: rgba(17, 24, 39, 0.02);
}

.pill-ghost {
    background: transparent;
}

header h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

header p {
    font-size: clamp(1rem, 2vw, 1.1rem);
    color: var(--muted);
    line-height: 1.7;
    max-width: 640px;
}

.hero-actions {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
}

.profile-wrap {
    display: flex;
    justify-content: center;
    margin: 0.5rem auto;
    position: relative;
}

.profile-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    border: 3px solid rgba(255,255,255,0.06);
    box-shadow: 0 14px 34px rgba(0,0,0,0.12);
    filter: grayscale(12%) contrast(1.02);
    transition: transform 0.6s cubic-bezier(.22,1,.36,1), box-shadow 0.6s cubic-bezier(.22,1,.36,1), filter 0.4s ease;
    animation: fadeInUp 0.8s ease backwards 0.2s, float 6s ease-in-out infinite;
}

.profile-circle-wrapper::after {
    content: '';
    position: absolute;
    inset: -10px;
    border-radius: 50%;
    pointer-events: none;
    background: conic-gradient(from 120deg, rgba(var(--accent-rgb),0.18), rgba(58,123,213,0.14));
    filter: blur(14px);
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 0.6s cubic-bezier(.22,1,.36,1), transform 0.6s cubic-bezier(.22,1,.36,1);
}

.profile-circle-wrapper:hover::after { opacity: 1; transform: scale(1); }

.profile-circle:hover {
    transform: translateY(-8px) scale(1.05);
    filter: none;
    box-shadow: 0 24px 60px rgba(2,6,23,0.16), 0 10px 30px rgba(var(--accent-rgb), 0.18);
}

.hero-card {
    background: var(--gradient-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.6rem;
    box-shadow: var(--card-shadow);
    display: grid;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

.hero-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(200px 160px at 20% 20%, rgba(var(--accent-rgb),0.12), transparent);
    opacity: 0.6;
    pointer-events: none;
}

.hero-card__eyebrow {
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
    font-size: 0.78rem;
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.75rem;
}

.meta-item {
    padding: 0.85rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(var(--accent-rgb), 0.03);
}

.meta-label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
    margin-bottom: 0.25rem;
}

.meta-item p {
    margin: 0;
    color: var(--text);
    font-weight: 600;
}

section {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
    background: var(--gradient-surface);
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    transition: transform 0.6s cubic-bezier(.2,.9,.3,1), box-shadow 0.45s cubic-bezier(.2,.9,.3,1), opacity 0.6s cubic-bezier(.2,.9,.3,1);
    opacity: 0;
    transform: translateY(18px) scale(0.997);
    overflow: hidden;
}

section:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow), 0 12px 36px rgba(16,24,40,0.12);
    border-color: rgba(var(--accent-rgb), 0.2);
}

.in-view {
    opacity: 1 !important;
    transform: none !important;
    transition-delay: calc(var(--i, 0) * 80ms);
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
    section { transform: none; opacity: 1; }
}

h2 {
    color: var(--text);
    margin-bottom: 1.5rem;
    display: inline-block;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid rgba(var(--accent-rgb), 0.2);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: -0.01em;
}

.about p {
    line-height: 1.7;
    margin-bottom: 1.2rem;
    color: var(--muted);
    font-size: 1.05rem;
}

.skills-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.skill-item {
    background: rgba(var(--accent-rgb), 0.02);
    border: 1px solid var(--border);
    padding: 1rem 1.2rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    position: relative;
}

.skill-item:hover {
    border-color: rgba(var(--accent-rgb), 0.32);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(var(--accent-rgb), 0.12);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.skill-title {
    font-weight: 700;
    color: var(--text);
    cursor: pointer;
    transition: color 0.3s ease;
}

.skill-title:hover { color: var(--accent); }

.skill-percentage {
    font-weight: 700;
    color: var(--accent);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(var(--accent-rgb), 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), rgba(var(--accent-rgb), 0.82));
    border-radius: 4px;
    width: 0%;
    transition: width 1.5s ease-out;
}

.skill-description {
    display: block;
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.5;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.skill-item:hover .skill-description,
.skill-item:focus-within .skill-description {
    opacity: 1;
    transform: translateY(0);
}

.projects-link,
.projects a,
.social-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 1.4rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    border: 1px solid rgba(var(--accent-rgb), 0.18);
    background: rgba(var(--accent-rgb), 0.08);
    color: var(--text);
    transition: transform 0.28s cubic-bezier(.22,.9,.35,1), box-shadow 0.28s ease, background 0.28s ease, color 0.28s ease;
    position: relative;
    overflow: hidden;
}

.projects-link.primary {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 14px 30px rgba(var(--accent-rgb), 0.4);
}

.projects-link.ghost {
    background: transparent;
    color: var(--text);
}

.projects-link:hover,
.projects a:hover,
.social-links a:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(var(--accent-rgb), 0.24);
    color: var(--text);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}

.project-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.2rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    text-decoration: none;
    color: var(--text);
}

.project-item:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--accent-rgb), 0.32);
    box-shadow: 0 10px 30px rgba(var(--accent-rgb), 0.14);
}

.project-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
}

.project-item p {
    margin: 0;
    color: var(--muted);
    line-height: 1.5;
    flex-grow: 1;
}

.project-item .project-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--muted);
}

.project-item .project-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.6rem;
    border-radius: 999px;
    background: rgba(var(--accent-rgb), 0.08);
}

.contact { max-width: 640px; margin: 2rem auto; }
.contact p { text-align: center; margin-bottom: 2rem; color: var(--muted); }

.form-group { margin-bottom: 1.4rem; }

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.9rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(var(--accent-rgb), 0.6);
    box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.14);
}

.submit-btn {
    width: 100%;
    padding: 0.95rem 1.4rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 12px 28px rgba(var(--accent-rgb), 0.32);
}

.submit-btn:hover { transform: translateY(-2px); }

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, rgba(var(--accent-rgb),0.4), rgba(var(--accent-rgb),0.1));
}

.timeline-item {
    position: relative;
    margin-left: 60px;
    margin-bottom: 1.8rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 10px;
    border: 1px solid var(--border);
    transition: transform 0.3s ease;
}

.timeline-item:hover { transform: translateX(10px); }

.timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 18px;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid var(--surface);
}

.timeline-item h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text);
    font-size: 1.1rem;
}

.timeline-date {
    color: var(--accent);
    font-weight: 700;
    margin: 0 0 0.5rem 0;
}

.timeline-item p {
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

footer {
    margin-top: 4rem;
    padding: 3rem 1rem;
    background: transparent;
    position: relative;
    z-index: 1;
    color: var(--muted);
    text-align: center;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.social-links a {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}

.theme-toggle {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: var(--surface);
    border-radius: 12px;
    color: var(--text);
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 1.3rem;
    box-shadow: var(--card-shadow);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
    transform: translateY(-2px);
    background: var(--accent);
    color: #fff;
}

@media (max-width: 900px) {
    header { padding: 4rem 1.25rem 3rem; }
    .hero-main { align-items: center; text-align: center; }
}

@media (max-width: 768px) {
    .topbar .inner { padding: 12px; }
    section { padding: 1.6rem; margin: 1.5rem 1rem; }
    .skills-list { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
    .social-links { flex-direction: column; align-items: stretch; padding: 0 1rem; }
    .social-links a { justify-content: center; }
}

@media (max-width: 540px) {
    header h1 { font-size: 2rem; }
    .profile-circle { width: 120px; height: 120px; }
    .projects-link, .projects a { width: 100%; justify-content: center; }
    .theme-toggle { bottom: 18px; right: 18px; width: 44px; height: 44px; }
}

@media (min-width: 960px) {
    header { text-align: left; }
    .hero-grid { grid-template-columns: 1.1fr 0.9fr; }
    .hero-main { align-items: flex-start; }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

button:focus,
input:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}