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

:root {
    --bg-color: #090f1c;
    --bg-elevated: #101a31;
    --card-bg: rgba(20, 33, 59, 0.72);
    --text-color: #e8eefc;
    --muted-text: #aeb8d1;
    --accent-color: #5dd6ff;
    --accent-strong: #2abdf1;
    --border-color: rgba(130, 159, 219, 0.25);
    --shadow: 0 20px 45px rgba(5, 8, 16, 0.35);
}

body.light {
    --bg-color: #f5f8ff;
    --bg-elevated: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.84);
    --text-color: #111b2f;
    --muted-text: #4f5f7e;
    --accent-color: #1c87d8;
    --accent-strong: #0f73bf;
    --border-color: rgba(57, 102, 165, 0.2);
    --shadow: 0 18px 42px rgba(20, 48, 88, 0.12);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", Arial, Helvetica, sans-serif;
    background: radial-gradient(circle at top right, #1a2746 0%, var(--bg-color) 38%);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.35s ease, color 0.35s ease;
}

body.light {
    background: radial-gradient(circle at top right, #d9ecff 0%, var(--bg-color) 34%);
}

a {
    color: inherit;
}

section {
    padding: 82px 20px;
}

.section-container {
    max-width: 1120px;
    margin: 0 auto;
}

.section-title {
    margin-bottom: 14px;
    font-size: clamp(1.75rem, 3vw, 2.15rem);
    line-height: 1.2;
}

.section-subtitle {
    color: var(--muted-text);
    margin-bottom: 28px;
    max-width: 760px;
}

.lead-text {
    margin-bottom: 12px;
    color: var(--muted-text);
}

#navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(16px);
    background: color-mix(in srgb, var(--bg-color) 78%, transparent);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.2px;
    color: var(--accent-color);
}

#primary-navigation {
    margin-left: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 18px;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted-text);
    font-size: 0.93rem;
    transition: color 0.25s ease;
}

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

#theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--bg-elevated);
    cursor: pointer;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 38px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-elevated);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background: var(--text-color);
}

.hero {
    position: relative;
    overflow: hidden;
    padding-top: 98px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 7% 10%, rgba(93, 214, 255, 0.18), transparent 35%),
        radial-gradient(circle at 86% 15%, rgba(32, 117, 245, 0.18), transparent 37%);
}

.hero-container {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 30px;
    align-items: center;
}

.hero-kicker {
    color: var(--accent-color);
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: 0.4px;
}

.hero-title {
    min-height: 72px;
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1.1;
    margin-bottom: 8px;
}

.type-cursor {
    display: inline-block;
    width: 10px;
    height: 1.1em;
    margin-left: 4px;
    vertical-align: -0.12em;
    background: var(--accent-color);
    animation: blink 0.9s steps(1) infinite;
}

@keyframes blink {
    0%, 48% { opacity: 1; }
    49%, 100% { opacity: 0; }
}

.hero-subtitle {
    min-height: 34px;
    margin-bottom: 14px;
    font-size: 1.12rem;
    color: var(--muted-text);
}

.hero-description {
    max-width: 640px;
    margin-bottom: 26px;
    color: var(--muted-text);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.btn {
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px solid transparent;
    font-weight: 600;
    font-size: 0.92rem;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-2px);
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-strong));
    color: #031425;
    box-shadow: 0 12px 28px rgba(28, 135, 216, 0.35);
}

.secondary-btn {
    border-color: var(--border-color);
    background: var(--bg-elevated);
}

.ghost-btn {
    border-color: var(--border-color);
    color: var(--muted-text);
}

.hero-image {
    justify-self: center;
}

.hero-image img {
    width: min(100%, 330px);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.skills-layout,
.projects-grid,
.edu-grid {
    display: grid;
    gap: 18px;
}

.skills-layout,
.edu-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(245px, 1fr));
}

.skills-card,
.project-card,
.timeline-item,
.edu-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(6px);
}

.skills-card h3,
.project-card h3,
.timeline-item h3,
.edu-card h3 {
    margin-bottom: 12px;
    font-size: 1.05rem;
}

.tag-list,
.project-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-list li,
.project-tags li {
    font-size: 0.78rem;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 5px 10px;
    color: var(--muted-text);
}

.project-card p,
.timeline-item p,
.edu-card p {
    margin-bottom: 12px;
    color: var(--muted-text);
}

.project-links {
    display: flex;
    gap: 14px;
}

.project-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.project-card {
    transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.project-card:hover,
.project-card:focus-within {
    transform: translateY(-4px);
    border-color: color-mix(in srgb, var(--accent-color) 46%, var(--border-color));
}

.timeline {
    display: grid;
    gap: 16px;
}

.timeline-meta {
    margin-bottom: 8px;
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 18px;
}

.contact-card {
    text-decoration: none;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 16px;
    box-shadow: var(--shadow);
    transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
    animation: contactGlow 3.8s ease-in-out infinite;
}

.contact-card:hover,
.contact-card:focus-visible {
    transform: translateY(-4px);
    border-color: color-mix(in srgb, var(--accent-color) 50%, var(--border-color));
}

.contact-label {
    font-size: 0.84rem;
    color: var(--muted-text);
    margin-bottom: 6px;
}

.contact-value {
    color: var(--text-color);
    font-size: 0.98rem;
    word-break: break-word;
}

.contact-cta {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 16px;
}

.contact-cta p {
    color: var(--muted-text);
}

@keyframes contactGlow {
    0%, 100% {
        box-shadow: var(--shadow);
    }
    50% {
        box-shadow: 0 16px 34px rgba(93, 214, 255, 0.16);
    }
}

footer {
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--muted-text);
    padding: 24px 20px 30px;
    font-size: 0.88rem;
}

.reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.75s ease, transform 0.75s ease;
    transition-delay: var(--delay, 0ms);
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 900px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }
}

@media (max-width: 780px) {
    .menu-toggle {
        display: flex;
        margin-left: auto;
    }

    #primary-navigation {
        position: absolute;
        top: 67px;
        left: 20px;
        right: 20px;
        background: var(--bg-elevated);
        border: 1px solid var(--border-color);
        border-radius: 14px;
        padding: 14px;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    }

    #primary-navigation.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-links {
        flex-direction: column;
        gap: 10px;
    }

    #theme-toggle {
        margin-left: 0;
    }

    .contact-cta {
        justify-content: center;
        text-align: center;
    }
}

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

    * {
        animation: none !important;
        transition: none !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}