:root {
    --color-bg: #0b0f19;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    --color-text: #f0f4f8;
    --color-text-muted: #9aa3b2;
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-secondary: rgba(255, 255, 255, 0.1);
    --color-border: rgba(255, 255, 255, 0.1);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
    --max-width: 1100px;
    --transition: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.background-glow {
    position: fixed;
    top: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, transparent 65%);
    pointer-events: none;
    z-index: -1;
}

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

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Header & Navigation */
.site-header {
    position: sticky;
    top: 0;
    background: rgba(11, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    position: relative;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.nav-toggle:hover {
    background: var(--color-surface);
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition);
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
}

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

.nav-links a.active {
    border-bottom-color: var(--color-primary);
}

/* Hero */
.hero {
    padding: 110px 0 80px;
    text-align: center;
}

.hero-greeting {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-description {
    max-width: 620px;
    margin: 0 auto 34px;
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 26px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
    border: 1px solid transparent;
}

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

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

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

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Page Sections */
.page-section {
    padding: 100px 0 110px;
}

.page-header {
    text-align: center;
    margin-bottom: 52px;
}

.page-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.page-subtitle {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto;
}

/* About Page */
.about-content {
    max-width: 760px;
    margin: 0 auto;
}

.about-intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 36px;
    line-height: 1.8;
}

.about-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.about-list li {
    display: flex;
    gap: 18px;
    padding: 22px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: background var(--transition), transform var(--transition);
}

.about-list li:hover {
    background: var(--color-surface-hover);
    transform: translateY(-3px);
}

.about-icon {
    font-size: 1.75rem;
    line-height: 1;
    flex-shrink: 0;
}

.about-list strong {
    display: block;
    font-size: 1.05rem;
    margin-bottom: 6px;
    color: var(--color-text);
}

.about-list p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.project-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow);
    height: 100%;
}

.project-card:hover {
    transform: translateY(-5px);
    background: var(--color-surface-hover);
    box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35);
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 18px;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.project-description {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 18px;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 22px;
}

.tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: #c7d2fe;
    background: rgba(99, 102, 241, 0.15);
    padding: 5px 11px;
    border-radius: 999px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition), color var(--transition);
}

.project-link:hover {
    gap: 12px;
    color: #818cf8;
}

.project-link svg {
    width: 18px;
    height: 18px;
}

/* Contact Page */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 860px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow);
}

.contact-card:hover {
    background: var(--color-surface-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35);
}

.contact-card-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.contact-card-body {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.contact-card-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-card-value {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    word-break: break-word;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 28px 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 640px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(11, 15, 25, 0.96);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        padding: 8px 0;
        transform: translateY(-10px);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    }

    .nav-links.open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        padding: 14px 24px;
        border-bottom: none;
        border-left: 3px solid transparent;
    }

    .nav-links a.active {
        border-bottom-color: transparent;
        border-left-color: var(--color-primary);
        background: var(--color-surface);
    }

    .hero {
        padding: 70px 0 50px;
    }

    .page-section {
        padding: 60px 0 80px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .project-card {
        padding: 22px;
    }

    .about-list li {
        flex-direction: column;
        gap: 12px;
    }

    .contact-cards {
        grid-template-columns: 1fr;
    }
}