/* ============================================
   CSS Variables
   ============================================ */
:root {
    --color-bg-primary: #1f2121;
    --color-bg-secondary: #262828;
    --color-text-primary: #f5f5f5;
    --color-text-secondary: #a7a9a9;
    --color-accent: #32b8c6;
    --color-accent-hover: #2da6b2;
    --color-border: rgba(167, 169, 169, 0.3);
    --color-code-comment: #62708d;
    --duration-normal: 250ms;
    --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   Navigation
   ============================================ */
nav {
    position: sticky;
    top: 0;
    background-color: rgba(31, 33, 33, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 2rem;
    z-index: 1000;
}

nav .container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    font-family: 'Monaco', 'Courier New', monospace;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--duration-normal) var(--ease-standard);
    cursor: pointer;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--duration-normal) var(--ease-standard);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-menu-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-standard);
}

.mobile-menu-backdrop.active {
    display: block;
    opacity: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(50, 184, 198, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    animation: fadeInUp 0.8s var(--ease-standard);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.terminal-line {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--color-code-comment);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.terminal-prompt {
    color: var(--color-accent);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 3rem);
    font-weight: 700;
    margin: 1rem 0;
    line-height: 1.2;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-highlight {
    font-size: clamp(1.8rem, 4vw, 2rem);
    color: var(--color-accent);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin: 1.5rem 0 2.5rem;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    border: 2px solid var(--color-accent);
    border-radius: 8px;
    color: var(--color-accent);
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-standard);
    position: relative;
    overflow: hidden;
}

.social-link svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.social-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--color-accent);
    transition: left var(--duration-normal) var(--ease-standard);
    z-index: -1;
}

.social-link:hover {
    color: var(--color-bg-primary);
    transform: translateY(-4px);
}

.social-link:hover::before {
    left: 0;
}

/* ============================================
   About Section
   ============================================ */
.about {
    padding: 6rem 2rem;
    border-top: 1px solid var(--color-border);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.section-header::before {
    content: '//';
    color: var(--color-code-comment);
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 1.2rem;
    font-weight: 600;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.about-content {
    max-width: 700px;
    margin-bottom: 2rem;
}

.about-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.expertise-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.expertise-item {
    padding: 1rem;
    border-left: 2px solid var(--color-accent);
    background-color: rgba(50, 184, 198, 0.05);
    border-radius: 4px;
    transition: all var(--duration-normal) var(--ease-standard);
}

.expertise-item:hover {
    background-color: rgba(50, 184, 198, 0.1);
    transform: translateX(4px);
}

.expertise-label {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.expertise-text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
    padding: 6rem 2rem;
    border-top: 1px solid var(--color-border);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    max-width: 800px;
}

.skill-category {
    background-color: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-standard);
}

.skill-category:hover {
    border-color: var(--color-accent);
    background-color: rgba(50, 184, 198, 0.05);
    transform: translateY(-4px);
}

.skill-category-title {
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category-title::before {
    content: '▸';
    color: var(--color-accent);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.skill-tag {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background-color: rgba(167, 169, 169, 0.15);
    color: var(--color-text-primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--duration-normal) var(--ease-standard);
    border: 1px solid transparent;
}

.skill-tag:hover {
    background-color: rgba(50, 184, 198, 0.15);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ============================================
   Footer
   ============================================ */
footer {
    border-top: 1px solid var(--color-border);
    padding: 4rem 2rem;
    text-align: center;
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-cta {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.footer-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.footer-social {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    border: 2px solid var(--color-accent);
    border-radius: 8px;
    color: var(--color-accent);
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-standard);
    position: relative;
    overflow: hidden;
}

.footer-social svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.footer-social::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--color-accent);
    transition: left var(--duration-normal) var(--ease-standard);
    z-index: -1;
}

.footer-social:hover {
    color: var(--color-bg-primary);
    transform: translateY(-3px);
}

.footer-social:hover::before {
    left: 0;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-code-comment);
    font-size: 0.85rem;
    font-family: 'Monaco', 'Courier New', monospace;
}

/* ============================================
   Responsive Media Queries
   ============================================ */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    nav {
        padding: 1rem 1.5rem;
    }

    nav .container {
        padding: 0;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--color-bg-primary);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 5rem 2rem 2rem;
        gap: 0;
        border-left: 1px solid var(--color-border);
        transition: right var(--duration-normal) var(--ease-standard);
        z-index: 1000;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
    }

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

    .nav-links li {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links a {
        display: block;
        padding: 1.25rem 0;
        font-size: 1rem;
        width: 100%;
    }

    .hero {
        min-height: auto;
        padding: 6rem 1.5rem 4rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-cta {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: 1.25rem;
    }

    .social-link {
        width: 48px;
        height: 48px;
        min-width: 48px;
        min-height: 48px;
    }

    .social-link svg {
        width: 24px;
        height: 24px;
    }

    .about,
    .skills,
    footer {
        padding: 4rem 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .container {
        padding: 0 1.5rem;
    }
}

@media (max-width: 480px) {
    nav {
        padding: 1rem;
    }

    .nav-logo {
        font-size: 1rem;
    }

    .hero {
        padding: 5rem 1rem 3rem;
    }

    .hero-title {
        font-size: 1.75rem;
        margin: 0.75rem 0;
    }

    .hero-title-highlight {
        font-size: 1.25rem;
        margin-bottom: 1.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.7;
        margin: 1.25rem 0 2rem;
    }

    .terminal-line {
        font-size: 0.9rem;
        margin-bottom: 0.4rem;
    }

    .hero-cta {
        gap: 1rem;
        margin-top: 2rem;
    }

    .social-link {
        width: 52px;
        height: 52px;
        min-width: 52px;
        min-height: 52px;
    }

    .social-link svg {
        width: 26px;
        height: 26px;
    }

    .about,
    .skills,
    footer {
        padding: 3rem 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .about-text {
        font-size: 0.95rem;
        line-height: 1.75;
        margin-bottom: 1.25rem;
    }

    .expertise-list {
        grid-template-columns: 1fr;
        gap: 1.25rem;
        margin-top: 1.5rem;
    }

    .expertise-item {
        padding: 1.25rem;
    }

    .expertise-label {
        font-size: 0.8rem;
        margin-bottom: 0.6rem;
    }

    .expertise-text {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .skill-category {
        padding: 1.25rem;
    }

    .skill-category-title {
        font-size: 0.85rem;
        margin-bottom: 1.25rem;
    }

    .skill-tag {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .footer-cta {
        font-size: 1.2rem;
        margin-bottom: 1.25rem;
    }

    .footer-subtitle {
        font-size: 0.9rem;
        line-height: 1.7;
        margin-bottom: 1.75rem;
    }

    .footer-links {
        flex-direction: column;
        align-items: center;
        gap: 1.25rem;
        margin-bottom: 1.75rem;
    }

    .footer-social {
        width: 52px;
        height: 52px;
        min-width: 52px;
        min-height: 52px;
    }

    .footer-social svg {
        width: 26px;
        height: 26px;
    }

    .footer-bottom {
        padding-top: 1.75rem;
        font-size: 0.8rem;
    }
}