/* ==========================================================================
   Design Tokens
   ========================================================================== */
:root {
    --bg-dark: #0b0f19;
    --bg-card: rgba(22, 28, 45, 0.45);
    --text-primary: #f0f4f8;
    --text-secondary: #8b9cb8;
    --accent-primary: #00e5ff;
    --accent-secondary: #4facfe;
    --accent-gradient: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    --glass-border: rgba(255, 255, 255, 0.07);
    --glass-border-hover: rgba(0, 229, 255, 0.25);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 0.3s;
    --duration-normal: 0.5s;
    --duration-slow: 0.8s;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 50px;
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.15);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, .logo {
    font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--duration-fast) ease;
}

ul { list-style: none; }

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    background: var(--accent-primary);
    color: var(--bg-dark);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    z-index: 9999;
    transition: top var(--duration-fast) ease;
}
.skip-link:focus {
    top: 1rem;
}

/* Focus outline for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
}

/* ==========================================================================
   Background Ambient Effects
   ========================================================================== */
.background-effects {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    will-change: transform;
}

.orb-1 {
    top: -15%;
    left: -15%;
    width: 55vw;
    height: 55vw;
    background: radial-gradient(circle, rgba(79,172,254,0.3), transparent 70%);
    animation: orb-float 25s ease-in-out infinite alternate;
}

.orb-2 {
    bottom: -20%;
    right: -15%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(0,229,255,0.2), transparent 70%);
    animation: orb-float 20s ease-in-out infinite alternate-reverse;
}

.orb-3 {
    top: 40%;
    left: 50%;
    width: 30vw;
    height: 30vw;
    background: radial-gradient(circle, rgba(79,172,254,0.1), transparent 70%);
    animation: orb-float 30s ease-in-out infinite alternate;
}

@keyframes orb-float {
    0%   { transform: translate(0, 0) scale(1); }
    50%  { transform: translate(20px, -20px) scale(1.05); }
    100% { transform: translate(-15px, 15px) scale(0.95); }
}

/* ==========================================================================
   Glass Card Utility
   ========================================================================== */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: border-color var(--duration-fast) ease,
                box-shadow var(--duration-fast) ease;
}

.glass-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 0;
    z-index: 1000;
    transition: background var(--duration-fast) ease,
                padding var(--duration-fast) ease,
                backdrop-filter var(--duration-fast) ease;
}

.navbar.scrolled {
    background: rgba(11, 15, 25, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--glass-border);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.logo-dot {
    color: var(--accent-primary);
}

/* Hamburger (mobile) */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
    z-index: 1001;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--duration-fast) ease,
                opacity var(--duration-fast) ease;
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}
.hamburger.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Nav links - mobile first: full-screen overlay */
.nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100dvh;
    background: rgba(11, 15, 25, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-fast) ease,
                visibility var(--duration-fast) ease;
}

.nav-links.open {
    opacity: 1;
    visibility: visible;
}

.nav-links a {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
    transition: color var(--duration-fast) ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    transition: width var(--duration-fast) var(--ease-out-expo);
    border-radius: 2px;
}

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

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

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    min-height: 100dvh;
    display: flex;
    align-items: center;
    padding: 80px 0 2rem;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 1.25rem;
}

.greeting {
    font-size: 0.95rem;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.name {
    font-size: clamp(2.2rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    word-break: break-word;
}

.title {
    font-size: clamp(1.1rem, 3.5vw, 2rem);
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    font-weight: 400;
    font-family: 'Inter', sans-serif;
}

.hero-summary {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
}

/* Hero Avatar */
.hero-avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    object-fit: cover;
    border: 3px solid transparent;
    background:
        linear-gradient(var(--bg-dark), var(--bg-dark)) padding-box,
        var(--accent-gradient) border-box;
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.2),
                0 0 60px rgba(79, 172, 254, 0.1);
    animation: avatar-pulse 4s ease-in-out infinite;
}

.hero-avatar--initials {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-primary);
    background: 
        linear-gradient(var(--bg-dark), var(--bg-dark)) padding-box,
        var(--accent-gradient) border-box;
    animation: avatar-pulse 4s ease-in-out infinite;
}

@keyframes avatar-pulse {
    0%, 100% { box-shadow: 0 0 30px rgba(0, 229, 255, 0.2), 0 0 60px rgba(79, 172, 254, 0.1); }
    50%      { box-shadow: 0 0 40px rgba(0, 229, 255, 0.35), 0 0 80px rgba(79, 172, 254, 0.15); }
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.3rem;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--glass-border);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: transform var(--duration-fast) ease,
                box-shadow var(--duration-fast) ease,
                background var(--duration-fast) ease;
    min-width: 180px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-dark);
    box-shadow: 0 4px 20px rgba(0, 229, 255, 0.25);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 229, 255, 0.35);
}

.btn-secondary {
    background: transparent;
    border: 1.5px solid rgba(0, 229, 255, 0.4);
    color: var(--accent-primary);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    background: rgba(0, 229, 255, 0.08);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ==========================================================================
   Sections Global
   ========================================================================== */
section {
    padding: 4rem 0;
    overflow: hidden;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    position: relative;
    display: table;
    margin: 0 auto 2.5rem;
    padding-bottom: 0.75rem;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 40px;
    height: 3px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-section .glass-card {
    max-width: 800px;
    margin: 0 auto;
}

.about-section p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-section p:last-of-type {
    margin-bottom: 0;
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.skill-card {
    text-align: center;
    padding: 1.5rem 1rem;
}

.skill-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(0, 229, 255, 0.08);
    border: 1px solid rgba(0, 229, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    transition: background var(--duration-fast) ease,
                transform var(--duration-fast) ease;
}

.skill-card:hover .skill-icon-wrap {
    background: rgba(0, 229, 255, 0.15);
    transform: scale(1.1);
}

.skill-icon-wrap i {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.skill-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
}

.skill-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   Journey / Timeline Section
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 24px;
}

.timeline::before {
    content: '';
    position: absolute;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-primary), transparent);
    top: 0;
    bottom: 0;
    left: 7px;
}

.timeline-item {
    position: relative;
    padding-left: 32px;
    padding-bottom: 2rem;
}

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

.timeline-dot {
    position: absolute;
    width: 14px;
    height: 14px;
    left: -24px;
    top: 6px;
    background: var(--bg-dark);
    border: 3px solid var(--accent-primary);
    border-radius: 50%;
    z-index: 1;
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.timeline-content {
    padding: 1.25rem;
}

.timeline-content .date {
    display: inline-block;
    padding: 3px 12px;
    background: rgba(0, 229, 255, 0.08);
    color: var(--accent-primary);
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    letter-spacing: 0.3px;
}

.timeline-content h3 {
    font-size: 1.15rem;
    margin-bottom: 0.25rem;
    font-weight: 700;
}

.timeline-content h4 {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.timeline-content .location {
    font-weight: 400;
    opacity: 0.7;
}

.timeline-content ul {
    list-style: none;
    padding-left: 0;
    color: var(--text-secondary);
}

.timeline-content li {
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    padding-left: 1.2rem;
    position: relative;
    line-height: 1.6;
}

.timeline-content li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 0.8rem;
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--duration-fast) ease;
}

.project-card:hover::before {
    opacity: 1;
}

.project-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-content h3 {
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
    font-weight: 700;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex-grow: 1;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.project-tags span {
    background: rgba(0, 229, 255, 0.06);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--accent-primary);
    border: 1px solid rgba(0, 229, 255, 0.12);
    letter-spacing: 0.3px;
}

/* ==========================================================================
   Education Section
   ========================================================================== */
.education-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    max-width: 700px;
    margin: 0 auto;
}

.edu-card {
    text-align: center;
    padding: 1.5rem;
}

.edu-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(0, 229, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.edu-icon i {
    font-size: 1.2rem;
    color: var(--accent-primary);
}

.edu-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
    font-weight: 700;
}

.edu-school {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.edu-meta {
    font-size: 0.82rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-card {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.contact-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.75rem;
}

.contact-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--duration-fast) ease;
}

.contact-btn:hover,
.contact-btn:focus-visible {
    background: rgba(0, 229, 255, 0.08);
    border-color: var(--glass-border-hover);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
    padding: 2rem 0;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    text-align: center;
}

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

.footer-tagline {
    font-size: 0.75rem;
    opacity: 0.5;
    margin-top: 0.3rem;
}

/* ==========================================================================
   Animations (Mobile First: fade-up only)
   ========================================================================== */
.anim-fade-in,
.anim-slide-up,
.anim-timeline {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--duration-slow) var(--ease-out-expo),
                transform var(--duration-slow) var(--ease-out-expo);
}

.anim-slide-up {
    transition-delay: calc(var(--delay, 0) * 80ms);
}

.anim-fade-in.visible,
.anim-slide-up.visible,
.anim-timeline.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .anim-fade-in,
    .anim-slide-up,
    .anim-timeline {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   Responsive: Tablet (min-width: 480px)
   ========================================================================== */
@media screen and (min-width: 480px) {
    .container {
        padding: 0 1.5rem;
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-actions {
        flex-direction: row;
    }

    .contact-links {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

/* ==========================================================================
   Responsive: Tablet / Desktop (min-width: 768px)
   ========================================================================== */
@media screen and (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }

    .glass-card {
        padding: 2rem;
    }

    /* Hide hamburger, show inline nav */
    .hamburger {
        display: none;
    }

    .nav-links {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        flex-direction: row;
        gap: 2rem;
        opacity: 1;
        visibility: visible;
    }

    .nav-links a {
        font-size: 0.95rem;
    }

    .nav-links a::after {
        left: 0;
        transform: none;
    }

    .logo {
        font-size: 1.8rem;
    }

    section {
        padding: 6rem 0;
    }

    .section-title {
        font-size: 2.2rem;
        margin-bottom: 3rem;
    }

    .section-title::after {
        width: 50px;
    }

    .hero-summary {
        font-size: 1.1rem;
    }

    .hero-avatar {
        width: 180px;
        height: 180px;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    /* Desktop Timeline - alternating sides */
    .timeline {
        padding-left: 0;
    }

    .timeline::before {
        left: 50%;
        transform: translateX(-50%);
    }

    .timeline-item {
        width: 50%;
        padding-left: 0;
        padding-right: 40px;
        padding-bottom: 2.5rem;
    }

    .timeline-item:nth-child(odd) {
        margin-left: 0;
        text-align: right;
    }

    .timeline-item:nth-child(odd) .timeline-content {
        margin-right: 0;
    }

    .timeline-item:nth-child(even) {
        margin-left: 50%;
        padding-right: 0;
        padding-left: 40px;
    }

    .timeline-dot {
        width: 18px;
        height: 18px;
        border-width: 3px;
    }

    .timeline-item:nth-child(odd) .timeline-dot {
        left: auto;
        right: -33px;
    }

    .timeline-item:nth-child(even) .timeline-dot {
        left: -33px;
    }

    .timeline-item:nth-child(odd) .timeline-content ul {
        text-align: left;
    }

    /* Desktop animations: slide from sides */
    .timeline-item:nth-child(odd).anim-timeline {
        transform: translateX(-30px);
        opacity: 0;
    }

    .timeline-item:nth-child(even).anim-timeline {
        transform: translateX(30px);
        opacity: 0;
    }

    .timeline-item.anim-timeline.visible {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ==========================================================================
   Responsive: Large Desktop (min-width: 1024px)
   ========================================================================== */
@media screen and (min-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .section-title {
        font-size: 2.5rem;
    }
}