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

:root {
    /* Colors */
    --color-bg: #0a0a0f;
    --color-bg-alt: #0f0f1a;
    --color-surface: #13131f;
    --color-surface-2: #1a1a2e;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    --color-text: #e8e8f0;
    --color-text-secondary: #9999b3;
    --color-text-muted: #666680;

    --color-accent: #7c6af7;
    --color-accent-hover: #9180ff;
    --color-accent-light: rgba(124, 106, 247, 0.15);
    --color-accent-glow: rgba(124, 106, 247, 0.3);

    --color-green: #10b981;
    --color-yellow: #f59e0b;
    --color-red: #ef4444;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --container-max: 1100px;
    --nav-height: 72px;

    /* Effects */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-accent: 0 0 40px rgba(124, 106, 247, 0.15);

    --transition: all 0.2s ease;
    --transition-slow: all 0.35s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* =========================================================
   Layout Utilities
   ========================================================= */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.375rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--color-accent-glow);
}

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

.btn-secondary:hover {
    border-color: var(--color-border-hover);
    background: rgba(255,255,255,0.04);
    transform: translateY(-1px);
}

/* =========================================================
   Navigation
   ========================================================= */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-slow);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

.nav-logo {
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: var(--transition);
}

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

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

.nav-cta {
    margin-left: auto;
}

@media (max-width: 640px) {
    .nav-links {
        display: none;
    }
}

/* =========================================================
   Section Base
   ========================================================= */
.section {
    padding: var(--space-4xl) 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
    padding-top: calc(var(--nav-height) + var(--space-4xl));
    padding-bottom: var(--space-4xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 106, 247, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

@media (max-width: 900px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
}

.hero-greeting {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-accent);
    letter-spacing: 0.08em;
    margin-bottom: var(--space-sm);
}

.hero-name {
    font-size: clamp(2.5rem, 7vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
}

.hero-bio {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.75;
    max-width: 520px;
    margin-bottom: var(--space-xl);
}

.hero-contact {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    transition: var(--transition);
}

a.contact-item:hover {
    color: var(--color-accent);
}

.contact-item svg {
    flex-shrink: 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

/* Code Window */
.code-window {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-accent);
}

.code-window-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.75rem var(--space-lg);
    background: var(--color-surface-2);
    border-bottom: 1px solid var(--color-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red { background: var(--color-red); }
.dot-yellow { background: var(--color-yellow); }
.dot-green { background: var(--color-green); }

.code-window-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-left: var(--space-sm);
}

.code-window-body {
    padding: var(--space-xl);
    overflow-x: auto;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-keyword { color: #c792ea; }
.code-var     { color: #82aaff; }
.code-prop    { color: #89ddff; }
.code-string  { color: #c3e88d; }
.code-comment { color: #546e7a; font-style: italic; }

/* =========================================================
   Projects
   ========================================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-slow);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.project-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-card--featured {
    border-color: rgba(124, 106, 247, 0.3);
    background: linear-gradient(135deg, var(--color-surface) 0%, rgba(124, 106, 247, 0.05) 100%);
}

.project-card--featured:hover {
    border-color: rgba(124, 106, 247, 0.5);
    box-shadow: var(--shadow-lg), var(--shadow-accent);
}

.project-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.project-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
}

.project-icon {
    color: var(--color-text-muted);
}

.project-card-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    flex: 1;
}

.project-title {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.project-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    flex: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: auto;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.tech-badge {
    font-family: var(--font-mono);
    font-size: 0.725rem;
    color: var(--color-text-muted);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.tech-badge:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-light);
}

/* =========================================================
   Timeline / Experience
   ========================================================= */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 120px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--color-border);
}

.timeline-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
    position: relative;
}

.timeline-item:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 116px;
    top: calc(var(--space-xl) + 0.5rem);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-bg-alt);
    box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-meta {
    padding-top: 0.125rem;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    display: block;
    text-align: right;
    padding-right: var(--space-xl);
}

.timeline-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.timeline-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.timeline-company {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding-left: 0;
}

.timeline-list li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
    padding-left: var(--space-md);
    position: relative;
}

.timeline-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-text-muted);
}

.timeline-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

@media (max-width: 640px) {
    .timeline::before {
        display: none;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .timeline-item::before {
        display: none;
    }

    .timeline-date {
        text-align: left;
        padding-right: 0;
    }
}

/* =========================================================
   Skills
   ========================================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.skill-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: var(--transition-slow);
}

.skill-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md), 0 0 24px var(--color-accent-light);
}

.skill-card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--color-accent-light);
    border: 1px solid rgba(124, 106, 247, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.skill-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.skill-card-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* =========================================================
   Education
   ========================================================= */
.education-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .education-layout {
        grid-template-columns: 1fr;
    }
}

.education-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.education-date {
    font-family: var(--font-mono);
    font-size: 0.775rem;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.education-degree {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.education-institution {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.education-coursework {
    font-size: 0.825rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-md);
}

.certifications {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.cert-group {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.cert-group--inprogress {
    border-color: rgba(245, 158, 11, 0.25);
    background: linear-gradient(135deg, var(--color-surface), rgba(245, 158, 11, 0.04));
}

.cert-group-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.cert-target {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-yellow);
    margin-left: var(--space-xs);
}

.cert-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.cert-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.cert-item svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

.cert-group--inprogress .cert-item svg {
    color: var(--color-yellow);
    animation: spin 3s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

/* =========================================================
   Footer
   ========================================================= */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

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

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

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

.footer-link:hover {
    color: var(--color-accent);
}

/* =========================================================
   Scroll Animations
   ========================================================= */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* =========================================================
   Selection
   ========================================================= */
::selection {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

/* =========================================================
   Scrollbar
   ========================================================= */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-surface-2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}