/* ============================================
   Custom Properties
   ============================================ */
:root {
    --color-bg-dark: #0b0f1a;
    --color-bg-section: #101627;
    --color-bg-card: #161d30;
    --color-bg-card-hover: #1c2540;
    --color-accent: #00bcd4;
    --color-accent-glow: rgba(0, 188, 212, 0.25);
    --color-accent-secondary: #7c4dff;
    --color-text: #e0e6f0;
    --color-text-muted: #8892a8;
    --color-text-heading: #ffffff;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-timeline-line: rgba(0, 188, 212, 0.2);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: #4dd0e1;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(11, 15, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-text-heading);
    letter-spacing: -0.5px;
}

.nav-logo:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 20%, rgba(0, 188, 212, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 60%, rgba(124, 77, 255, 0.08) 0%, transparent 50%),
        var(--color-bg-dark);
    animation: heroShift 12s ease-in-out infinite alternate;
}

@keyframes heroShift {
    0% {
        background-position: 0% 0%, 100% 100%;
    }
    100% {
        background-position: 100% 100%, 0% 0%;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 750px;
}

.hero-greeting {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.hero-name {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    color: var(--color-text-heading);
    line-height: 1.05;
    letter-spacing: -2px;
    margin-bottom: 20px;
}

.hero-tagline {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
    background: var(--color-accent);
    color: var(--color-bg-dark);
}

.hero-btn:hover {
    background: #4dd0e1;
    color: var(--color-bg-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-accent-glow);
}

.hero-btn--outline {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.hero-btn--outline:hover {
    background: var(--color-accent);
    color: var(--color-bg-dark);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: bounce 2s ease-in-out infinite;
}

.hero-scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ============================================
   Sections (General)
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(odd) {
    background: var(--color-bg-section);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    color: var(--color-text-heading);
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -1px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--color-accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ============================================
   Fade-in Animation
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   About Section
   ============================================ */
.about-content {
    max-width: 1050px;
    margin: 0 auto;
}

.about-top {
    display: flex;
    align-items: center;
    gap: 48px;
    margin-bottom: 8px;
}

.about-photo {
    flex-shrink: 0;
}

.about-photo img {
    width: 380px;
    height: 460px;
    object-fit: cover;
    object-position: top;
    border-radius: var(--radius);
    border: 2px solid var(--color-border);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.about-bio {
    text-align: left;
}

.about-side-photos {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-side-photos img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: var(--radius);
    border: 2px solid var(--color-border);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
    transition: all var(--transition);
}

.about-side-photos img:hover {
    border-color: var(--color-accent);
    transform: scale(1.03);
}

.about-text {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.highlight-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-align: center;
    transition: all var(--transition);
}

.highlight-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.highlight-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 4px;
}

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

/* ============================================
   Skills Section
   ============================================ */
.impact-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.stat-card {
    text-align: center;
    padding: 36px 20px;
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.08), rgba(124, 77, 255, 0.06));
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.stat-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.stat-number {
    display: block;
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--color-text-heading);
    letter-spacing: -1px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-top: 6px;
    display: block;
}

.skill-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skill-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all var(--transition);
}

.skill-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.skill-icon {
    color: var(--color-accent);
    margin-bottom: 16px;
    line-height: 1;
}

.skill-icon svg {
    display: block;
}

.skill-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 16px;
}

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

.tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 188, 212, 0.1);
    color: var(--color-accent);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(0, 188, 212, 0.15);
    transition: all var(--transition);
}

.tag:hover {
    background: rgba(0, 188, 212, 0.2);
    border-color: var(--color-accent);
}

/* ============================================
   Experience Timeline
   ============================================ */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-timeline-line);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 24px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-bg-dark);
    border: 3px solid var(--color-accent);
    z-index: 1;
    transition: all var(--transition);
}

.timeline-item:hover .timeline-marker {
    background: var(--color-accent);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.timeline-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all var(--transition);
}

.timeline-card:hover {
    border-color: var(--color-accent);
    transform: translateX(4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.timeline-date {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    background: rgba(0, 188, 212, 0.1);
    padding: 4px 12px;
    border-radius: 50px;
    margin-bottom: 12px;
}

.timeline-role {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.timeline-details {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-details li {
    position: relative;
    padding-left: 20px;
    font-size: 0.92rem;
    color: var(--color-text);
    line-height: 1.6;
}

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

/* ============================================
   Education Section
   ============================================ */
.education-card {
    max-width: 800px;
    margin: 0 auto;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px;
    transition: all var(--transition);
}

.education-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.education-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}

.education-degree {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.education-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    background: rgba(0, 188, 212, 0.1);
    padding: 4px 14px;
    border-radius: 50px;
    white-space: nowrap;
}

.education-school {
    font-size: 1.05rem;
    color: var(--color-text);
    margin-bottom: 4px;
}

.education-emphasis {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.education-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.education-detail-item {
    font-size: 0.95rem;
    color: var(--color-text);
}

.education-detail-item strong {
    color: var(--color-text-heading);
}

.education-coursework {
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.education-coursework strong {
    display: block;
    color: var(--color-text-heading);
    margin-bottom: 12px;
    font-size: 0.95rem;
}

/* ============================================
   Passions Section
   ============================================ */
.passions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.passion-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    transition: all var(--transition);
}

.passion-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.passion-icon {
    color: var(--color-accent);
    margin-bottom: 16px;
    line-height: 1;
}

.passion-icon svg {
    display: block;
    margin: 0 auto;
}

.passion-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 12px;
}

.passion-desc {
    font-size: 0.92rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    text-align: center;
}

.contact-text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 28px;
    color: var(--color-text);
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--color-accent);
    color: var(--color-text-heading);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.contact-icon {
    color: var(--color-accent);
    line-height: 1;
    display: flex;
    align-items: center;
}

.contact-label {
    font-size: 0.95rem;
    font-weight: 500;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-dark);
}

.footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(11, 15, 26, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        gap: 0;
        padding: 20px 0;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

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

    .nav-links a {
        display: block;
        padding: 14px 24px;
        font-size: 1rem;
    }

    .nav-links a::after {
        display: none;
    }

    .about-top {
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }

    .about-bio {
        text-align: center;
    }

    .about-photo img {
        width: 100%;
        max-width: 300px;
        height: 360px;
    }

    .about-side-photos {
        flex-direction: row;
        justify-content: center;
    }

    .about-side-photos img {
        width: 150px;
        height: 150px;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }

    .impact-stats {
        grid-template-columns: 1fr;
    }

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

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

    .timeline {
        padding-left: 30px;
    }

    .timeline-marker {
        left: -30px;
        width: 12px;
        height: 12px;
    }

    .timeline-card {
        padding: 24px;
    }

    .education-card {
        padding: 28px;
    }

    .education-header {
        flex-direction: column;
    }

    .section {
        padding: 70px 0;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-name {
        letter-spacing: -1px;
    }

    .hero-links {
        flex-direction: column;
        align-items: center;
    }

    .stat-number {
        font-size: 2rem;
    }

    .section-title {
        margin-bottom: 40px;
    }
}