/* ============================================
   CSS VARIABLES & THEME CONFIGURATION
   ============================================ */

:root {
    /* Colors */
    --black: #000000;
    --white: #FFFFFF;
    --black-02: #282828;
    --gray: #f6f7f8;
    --text-color-gray: #5f6980;

    /* Light Mode (Default) */
    --bg-primary: #f6f7f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #ffffff;
    --text-primary: #000000;
    --text-secondary: #5f6980;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.08);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    --navbar-bg: rgba(255, 255, 255, 0.8);
    --card-bg: #ffffff;
    --skill-bg: #f0f0f0;
    --tag-bg: #f0f0f0;
    --tag-text: #282828;

    /* Retro Typography */
    --font-display: 'Space Mono', monospace;
    --font-body: 'Space Mono', monospace;
    --font-retro: 'VT323', monospace;

    /* Spacing */
    --section-padding: 120px;
    --container-max-width: 1200px;
    --container-padding: 40px;

    /* Transitions */
    --transition-fast: 200ms ease;
    --transition-medium: 300ms ease;
    --transition-slow: 400ms ease;
    --transition-reveal: 800ms cubic-bezier(0.165, 0.840, 0.440, 1);

    /* Border Radius */
    --radius-pill: 50px;
    --radius-card: 16px;
    --radius-button: 8px;
    --radius-toggle: 20px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
    --navbar-bg: rgba(20, 20, 20, 0.8);
    --card-bg: #1a1a1a;
    --skill-bg: #2a2a2a;
    --tag-bg: #2a2a2a;
    --tag-text: #e0e0e0;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
}

/* Reduced Motion */

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-section {
    margin-top: 32px;
}

.contact-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contact-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-button);
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-slow),
                border-color var(--transition-slow);
    will-change: transform, box-shadow;
}

.contact-link:hover {
    transform: translateY(-3px);
    box-shadow: 4px 4px 0 var(--text-primary);
    border-color: var(--text-primary);
}

.contact-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ============================================
   EDUCATION SECTION
   ============================================ */

.education-section {
    margin-top: 32px;
}

.education-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.education-card {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--card-bg);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-slow),
                border-color var(--transition-slow);
    will-change: transform, box-shadow;
}

.education-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px var(--shadow-hover);
}

.education-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.icon-text {
    font-family: var(--font-retro);
    font-size: 20px;
    font-weight: 400;
    letter-spacing: 0.05em;
}

.education-info {
    flex: 1;
}

.education-info h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.education-school {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.education-date {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-family: var(--font-display);
    font-weight: 700;
}

.education-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive adjustments for education */
@media (max-width: 767px) {
    .education-card {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }

    .education-icon {
        width: 48px;
        height: 48px;
    }

    .education-info h4 {
        font-size: 15px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-title {
    font-size: 42px;
    margin-bottom: 16px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-weight: 700;
}

/* ============================================
   LAYOUT
   ============================================ */

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

/* ============================================
   NAVIGATION - FLOATING NAVBAR
   ============================================ */

.navbar {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    box-shadow: 0 4px 20px var(--shadow-color);
    padding: 12px 24px;
    transition: background-color var(--transition-slow), 
                border-color var(--transition-slow),
                box-shadow var(--transition-slow),
                opacity 600ms ease, 
                transform 600ms ease;
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
}

.navbar.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 50%;
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 18px;
    transition: transform var(--transition-fast);
    will-change: transform;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-text {
    line-height: 1;
}

/* Navigation Links - Desktop */
.nav-links {
    display: flex;
    list-style: none;
    gap: 28px;
}

.nav-link {
    position: relative;
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 14px;
    padding: 4px 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: opacity var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transform: translateX(-50%) scaleX(0);
    transition: transform var(--transition-medium);
    will-change: transform;
}

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-link:hover {
    opacity: 0.7;
}

/* Navigation Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

/* Theme Toggle */
.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                transform var(--transition-fast);
    will-change: transform;
}

.theme-toggle:hover {
    background: var(--skill-bg);
    transform: scale(1.05);
}

.toggle-icons {
    position: relative;
    width: 22px;
    height: 22px;
}

.icon-sun,
.icon-moon {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: opacity var(--transition-medium),
                transform var(--transition-medium);
    will-change: opacity, transform;
}

.icon-sun {
    opacity: 1;
    transform: rotate(0deg);
}

.icon-moon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

/* Burger Menu */
.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.burger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-medium),
                opacity var(--transition-medium);
    will-change: transform, opacity;
}

.burger-menu.active .burger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.burger-menu.active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger-menu.active .burger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Panel */
.mobile-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-medium),
                padding var(--transition-medium),
                opacity var(--transition-medium);
    will-change: max-height, opacity;
}

.mobile-menu.active {
    max-height: 300px;
    padding: 20px 24px;
    opacity: 1;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 16px;
    padding: 8px 0;
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: opacity var(--transition-fast);
}

.mobile-nav-link:hover {
    opacity: 0.7;
}

/* ============================================
   HERO SECTION WITH SPACE ANIMATION
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--bg-primary);
    position: relative;
    padding: 0 24px;
    overflow: hidden;
}

/* Space Animation Canvas */
.space-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-name {
    font-family: var(--font-retro);
    font-size: 120px;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1;
    letter-spacing: 0.05em;
}

.hero-tagline {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-top: 16px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-secondary);
    animation: bounce 1.5s ease infinite;
    will-change: transform;
    z-index: 1;
}

.scroll-chevron {
    width: 32px;
    height: 32px;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 80px;
    align-items: start;
    max-width: 1100px;
    margin: 0 auto;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 600px;
}

.skills-section {
    margin-top: 24px;
}

.skills-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-item {
    padding: 10px 20px;
    background: var(--skill-bg);
    border-radius: var(--radius-pill);
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: transform var(--transition-fast),
                background-color var(--transition-slow);
    will-change: transform;
}

.skill-item:hover {
    transform: translateY(-2px);
}

.about-visual {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-card {
    padding: 36px;
    background: var(--card-bg);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-slow),
                border-color var(--transition-slow);
    will-change: transform, box-shadow;
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px var(--shadow-hover);
}

.card-icon {
    width: 48px;
    height: 48px;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.card-icon .icon-text {
    font-size: 28px;
}

.about-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.about-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   PROJECTS SECTION - THINNER LINKS
   ============================================ */

.projects {
    padding: var(--section-padding) 0;
    background: var(--bg-primary);
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.project-link {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    transition: padding var(--transition-medium),
                background-color var(--transition-fast);
    will-change: padding;
}

.project-link:first-child {
    border-top: 1px solid var(--border-color);
}

.project-link:hover {
    padding: 32px 24px;
    background: var(--card-bg);
}

.project-number {
    font-family: var(--font-retro);
    font-size: 24px;
    color: var(--text-secondary);
    min-width: 40px;
    flex-shrink: 0;
}

.project-info {
    flex: 1;
    min-width: 0;
}

.project-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
}

.project-link:hover .project-title {
    color: var(--text-primary);
}

.project-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.project-tags-inline {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.project-tags-inline .tag {
    padding: 4px 10px;
    background: var(--tag-bg);
    border-radius: var(--radius-button);
    font-size: 10px;
    font-weight: 700;
    color: var(--tag-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: background-color var(--transition-slow);
}

.project-arrow {
    font-family: var(--font-retro);
    font-size: 32px;
    color: var(--text-secondary);
    transition: transform var(--transition-fast),
                color var(--transition-fast);
    flex-shrink: 0;
}

.project-link:hover .project-arrow {
    transform: translateX(8px);
    color: var(--text-primary);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    padding: 40px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text,
.footer-year {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */

.reveal-text {
    opacity: 0;
    transform: translateY(60px);
    transition: opacity var(--transition-reveal),
                transform var(--transition-reveal);
    will-change: opacity, transform;
}

.reveal-text.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for child elements */
.reveal-text:nth-child(1) { transition-delay: 0ms; }
.reveal-text:nth-child(2) { transition-delay: 100ms; }
.reveal-text:nth-child(3) { transition-delay: 200ms; }
.reveal-text:nth-child(4) { transition-delay: 300ms; }
.reveal-text:nth-child(5) { transition-delay: 400ms; }
.reveal-text:nth-child(6) { transition-delay: 500ms; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Large Desktop */
@media (min-width: 1400px) {
    .about-grid {
        grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
        gap: 100px;
        max-width: 1300px;
    }

    .about-text {
        font-size: 17px;
        max-width: 700px;
    }
}

/* Tablet */
@media (max-width: 1023px) {
    :root {
        --section-padding: 80px;
        --container-padding: 24px;
    }

    .hero-name {
        font-size: 90px;
    }

    .section-title {
        font-size: 36px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
        max-width: 100%;
    }

    .about-text {
        max-width: 100%;
    }

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

    /* Project links responsive */
    .project-link {
        gap: 24px;
        padding: 24px 0;
    }

    .project-link:hover {
        padding: 24px 16px;
    }

    .project-number {
        font-size: 20px;
        min-width: 32px;
    }

    .project-title {
        font-size: 18px;
    }

    .project-tags-inline {
        display: none;
    }
}

/* Mobile */
@media (max-width: 767px) {
    :root {
        --section-padding: 60px;
        --container-padding: 20px;
    }

    /* Navbar */
    .navbar {
        width: calc(100% - 40px);
        padding: 10px 16px;
    }

    .nav-links {
        display: none;
    }

    .burger-menu {
        display: flex;
    }

    .nav-container {
        gap: 16px;
    }

    /* Hero */
    .hero-name {
        font-size: 70px;
    }

    .hero-greeting {
        font-size: 16px;
    }

    .hero-tagline {
        font-size: 14px;
    }

    /* About */
    .section-title {
        font-size: 32px;
    }

    .about-text {
        font-size: 14px;
    }

    .about-visual {
        flex-direction: column;
    }

    .about-card {
        padding: 24px;
    }

    /* Projects - thinner on mobile */
    .project-link {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 20px 0;
    }

    .project-link:hover {
        padding: 20px 12px;
    }

    .project-number {
        font-size: 18px;
        order: -1;
    }

    .project-title {
        font-size: 16px;
    }

    .project-description {
        font-size: 13px;
    }

    .project-arrow {
        display: none;
    }

    .section-subtitle {
        font-size: 14px;
    }

    /* Contact */
    .contact-links {
        flex-direction: column;
    }

    .contact-link {
        justify-content: center;
    }

    /* Footer */
    .footer .container {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

/* Small Mobile */
@media (max-width: 374px) {
    .hero-name {
        font-size: 56px;
    }

    .section-title {
        font-size: 28px;
    }

    .skill-item {
        padding: 8px 16px;
        font-size: 12px;
    }
}