:root {
    --bg: #fafafa;
    --bg-alt: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #888888;
    --accent: #111111;
    --accent-light: #f0f0f0;
    --border: #e5e5e5;
    --radius: 10px;
    --nav-height: 72px;
    --container-max: 1100px;
    --transition: 0.3s ease;
    --nav-bg: rgba(250, 250, 250, 0.85);
}

[data-theme="dark"] {
    --bg: #0f0f0f;
    --bg-alt: #1a1a1a;
    --text: #e5e5e5;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent: #e5e5e5;
    --accent-light: #222222;
    --border: #2a2a2a;
    --nav-bg: rgba(15, 15, 15, 0.85);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    line-height: 1.3;
    font-weight: 600;
    color: var(--text);
}

strong {
    font-weight: 600;
}

/* ==================== Container ==================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==================== Navbar ==================== */
.navbar {
    height: var(--nav-height);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: transform var(--transition);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
    letter-spacing: -0.5px;
}

.logo .dot {
    color: var(--text-muted);
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color var(--transition);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
    position: relative;
}

.theme-toggle:hover {
    border-color: var(--text-muted);
    color: var(--text);
}

.theme-toggle .fa-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: block;
}

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

.bar {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

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

.hero-content {
    max-width: 640px;
    padding: 80px 0;
}

.greeting {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
    letter-spacing: 0.5px;
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.role-container {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-weight: 500;
    display: flex;
    gap: 6px;
    align-items: baseline;
}

.role-wrapper {
    position: relative;
    display: inline-block;
    height: 1.4em;
    overflow: hidden;
    vertical-align: bottom;
}

.role-text {
    display: block;
    color: var(--text);
    font-weight: 600;
    line-height: 1.4;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    position: absolute;
    top: 0;
    left: 0;
    white-space: nowrap;
}

.role-text.active {
    opacity: 1;
    transform: translateY(0);
    position: relative;
}

.hero-description {
    font-size: 1.05rem;
    max-width: 520px;
    margin-bottom: 32px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
}

.btn {
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg);
    border: 1px solid var(--accent);
}

.btn-primary:hover {
    opacity: 0.8;
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--text);
}

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

.social-hero a {
    color: var(--text-muted);
    font-size: 1.25rem;
    transition: color var(--transition);
    text-decoration: none;
}

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

/* ==================== Sections ==================== */
.section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 2rem;
    margin-bottom: 48px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ==================== About ==================== */
.about-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 60px;
    align-items: start;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stat-box {
    background: var(--bg-alt);
    padding: 20px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: border-color var(--transition);
    min-width: 160px;
}

.stat-box:hover {
    border-color: var(--text-muted);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.about-text p {
    margin-bottom: 16px;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.about-text strong {
    color: var(--text);
}

/* ==================== Skills ==================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

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

.skill-category:hover {
    border-color: var(--text-muted);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.category-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.category-icon {
    font-size: 1rem;
    color: var(--text-muted);
}

.exp-badge {
    margin-left: auto;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--accent-light);
    color: var(--text-secondary);
    padding: 3px 10px;
    border-radius: 20px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background: var(--accent-light);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

/* ==================== Timeline ==================== */
.timeline {
    max-width: 700px;
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 7px;
    width: 2px;
    height: calc(100% - 16px);
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 3px solid var(--text-muted);
    z-index: 1;
}

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

.timeline-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.timeline-date {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.company {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.timeline-list {
    list-style: none;
}

.timeline-list li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 6px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--border);
}

.timeline-list li strong {
    color: var(--text);
}

/* ==================== Contact ==================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-intro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-item i {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: 4px;
    width: 20px;
    text-align: center;
}

.contact-item span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item a,
.contact-item p {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
}

.contact-item a:hover {
    text-decoration: underline;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition);
}

.social-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* ==================== Form ==================== */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--text);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.submit-btn {
    padding: 12px 28px;
    background: var(--accent);
    border: none;
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background var(--transition);
    align-self: flex-start;
}

.submit-btn:hover {
    background: #333;
}

/* ==================== Footer ==================== */
footer {
    padding: 32px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* ==================== Reveal Animation ==================== */
[data-reveal] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].active {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .section {
        padding: 72px 0;
    }

    .section-title {
        font-size: 1.6rem;
        margin-bottom: 36px;
    }

    .hero-content {
        padding: 48px 0;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        right: -100%;
        width: 100%;
        height: calc(100vh - var(--nav-height));
        background: var(--bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: right var(--transition), background var(--transition);
        border-top: 1px solid var(--border);
    }

    .nav-links.active {
        right: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active .bar:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

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

    .about-stats {
        flex-direction: row;
    }

    .stat-box {
        flex: 1;
        min-width: unset;
        padding: 16px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .btn {
        text-align: center;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .about-stats {
        flex-direction: column;
    }
}