/**
 * Eli Gorelick Portfolio Styles
 * Clean, professional, modern
 */

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

/* Base */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 8px;
    background: var(--accent);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: var(--radius);
    z-index: 10000;
    font-weight: var(--font-weight-bold);
}

.skip-link:focus {
    top: 8px;
    box-shadow: var(--ring);
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(14, 22, 38, 0.95);
    backdrop-filter: blur(12px) saturate(180%);
    border-bottom: 1px solid var(--line);
    transition: box-shadow var(--transition-base) var(--easing-smooth);
}

header.scrolled {
    box-shadow: var(--shadow-md);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: var(--space-lg);
}

.brand {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--text);
    text-decoration: none;
    transition: color var(--transition-fast) var(--easing-smooth);
}

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

.brand:focus-visible {
    outline: none;
    box-shadow: var(--ring);
    border-radius: 4px;
}

/* Nav */
nav ul {
    list-style: none;
    display: flex;
    gap: var(--space-lg);
}

nav a {
    color: var(--muted);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast) var(--easing-smooth);
    position: relative;
}

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

nav a:focus-visible {
    outline: none;
    color: var(--accent);
    box-shadow: var(--ring);
    border-radius: 4px;
    padding: 4px 8px;
    margin: -4px -8px;
}

nav a[aria-current="page"] {
    color: var(--accent);
}

nav a[aria-current="page"]::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

/* Social icons */
.social-icons {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.social-icons a {
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    transition: all var(--transition-fast) var(--easing-smooth);
}

.social-icons a:hover {
    color: var(--text);
    background: var(--surface);
}

.social-icons a:focus-visible {
    outline: none;
    box-shadow: var(--ring);
}

/* Mobile menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition-base) var(--easing-smooth);
}

/* Hero */
.hero {
    padding: var(--space-4xl) 0 var(--space-3xl);
}

.hero h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
    max-width: 800px;
}

.hero-subtext {
    font-size: var(--font-size-md);
    color: var(--muted);
    line-height: var(--line-height-normal);
    margin-bottom: var(--space-xl);
    max-width: 600px;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast) var(--easing-smooth);
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--ring);
}

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

.btn-primary:hover {
    background: #2E5FA8;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--line);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-small {
    padding: 8px 16px;
    font-size: var(--font-size-xs);
}

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-md);
}

.btn-project {
    background: linear-gradient(135deg, var(--accent) 0%, #2E5FA8 100%);
    color: white;
    font-weight: var(--font-weight-bold);
    gap: 6px;
}

.btn-project:hover {
    background: linear-gradient(135deg, #2E5FA8 0%, var(--accent) 100%);
    transform: translateY(-2px);
}

.btn-project svg {
    transition: transform var(--transition-fast) var(--easing-smooth);
}

.btn-project:hover svg {
    transform: translate(2px, -2px);
}

@media (prefers-reduced-motion: reduce) {
    .btn:hover {
        transform: none;
    }
    .btn-project:hover svg {
        transform: none;
    }
}

/* Sections */
section {
    padding: var(--space-3xl) 0;
}

section h2 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-xl);
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: var(--space-lg);
    transition: transform var(--transition-fast) var(--easing-smooth);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card:focus-visible {
    outline: none;
    box-shadow: var(--ring);
}

.card h3 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-sm);
}

.card-description {
    color: var(--muted);
    margin-bottom: var(--space-md);
    line-height: var(--line-height-normal);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.project-logo {
    border-radius: 8px;
    border: 1px solid var(--line);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: var(--space-md);
}

.card-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.card-featured {
    border-width: 2px;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 20px;
    transition: all var(--transition-fast) var(--easing-smooth);
}

.tag:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    border-radius: 12px;
}

.status-live {
    background: #10B981;
    color: white;
}

/* Featured section */
.featured-section {
    background: var(--surface);
}

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

/* About section */
.about-section {
    background: var(--surface);
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

@media (max-width: 1024px) {
    .two-col {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.about-section p {
    max-width: 80ch;
    color: var(--muted);
    line-height: var(--line-height-normal);
}

/* Skills */
.skills-group {
    margin-bottom: var(--space-lg);
}

.skills-group h3 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
}

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

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

.contact-section h2 {
    margin-bottom: var(--space-lg);
}

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

footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: var(--font-size-xs);
    transition: color var(--transition-fast) var(--easing-smooth);
}

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

.copyright {
    color: var(--muted);
    font-size: var(--font-size-xs);
}

/* Reveal on scroll */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--transition-base) var(--easing-smooth),
                transform var(--transition-base) var(--easing-smooth);
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal-on-scroll {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* Mobile responsive */
@media (max-width: 768px) {
    :root {
        --font-size-xl: 32px;
        --font-size-lg: 24px;
        --font-size-md: 18px;
        --space-4xl: 64px;
        --space-3xl: 48px;
    }

    header .container {
        flex-wrap: wrap;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: var(--space-md) 0;
        gap: var(--space-sm);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .social-icons {
        order: -1;
    }

    .hero-ctas {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

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

    .card {
        padding: var(--space-md);
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-xl: 28px;
        --font-size-lg: 22px;
        --space-4xl: 48px;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .hero {
        padding: var(--space-3xl) 0 var(--space-2xl);
    }

    .social-icons {
        gap: 8px;
    }

    .social-icons a {
        width: 36px;
        height: 36px;
    }

    .btn-project span {
        font-size: 13px;
    }

    .btn-project svg {
        width: 14px;
        height: 14px;
    }

    section {
        padding: var(--space-2xl) 0;
    }

    .card-tags {
        gap: 6px;
    }

    .tag {
        font-size: 12px;
        padding: 3px 10px;
    }
}

/* Tablet landscape optimization */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        padding: 0 var(--space-xl);
    }

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