:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fb;
    --text-primary: #1f2933;
    --text-secondary: #6b7280;
    --accent-color: #4361ee;
    --accent-soft: rgba(67, 97, 238, 0.12);
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.25s ease;
}

.dark-theme {
    --bg-primary: #0f1115;
    --bg-secondary: #151820;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-color: #4cc9f0;
    --accent-soft: rgba(76, 201, 240, 0.14);
    --card-bg: #1c1f2a;
    --border-color: #2a2f3a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.45);
}

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

body {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.75;
    transition: var(--transition);
    overflow-x: hidden;
    padding-bottom: 90px;
    font-size: 1.05rem;
}

/* Canvas */
canvas {
    position: fixed;
    inset: 0;
    z-index: -1;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.dark-theme header {
    background: rgba(15, 17, 21, 0.85);
}

.header-content {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 0;
}

/* Navigation */
.nav-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.nav-button:hover,
.nav-button.active {
    background: var(--accent-soft);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* Controls */
.controls {
    display: flex;
    gap: 12px;
    margin-left: auto;
}

.theme-toggle,
.lang-toggle {
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover,
.lang-toggle:hover {
    background: var(--accent-soft);
    color: var(--accent-color);
}

/* Sections */
section {
    padding: 70px 0;
}

.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 40px;
    color: var(--accent-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 72px;
    height: 3px;
    margin: 14px auto 0;
    background: var(--accent-color);
    border-radius: 2px;
}

/* About */
.about-text p {
    max-width: 900px;
    margin: 0 auto 22px;
    font-size: 1.15rem;
    color: var(--text-secondary);
}

/* Skills */
.skills {
    margin-top: 50px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 22px;
}

.skill-item {
    position: relative;
    padding: 22px 16px;
    text-align: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.skill-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.skill-icon {
    font-size: 2.4rem;
    color: var(--accent-color);
    margin-bottom: 14px;
}

.skill-name {
    font-weight: 600;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

.project-card {
    background: var(--card-bg);
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.project-image {
    height: 200px;
    background: linear-gradient(135deg, var(--accent-color), #3a0ca3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 3rem;
}

.project-info {
    padding: 22px;
}

.project-info h3 {
    font-size: 1.35rem;
    margin-bottom: 12px;
}

.project-info p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

/* Contact */
.contact-links {
    display: flex;
    justify-content: center;
    gap: 22px;
}

.contact-link {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.4rem;
    transition: var(--transition);
}

.contact-link:hover {
    background: var(--accent-soft);
    color: var(--accent-color);
    transform: translateY(-4px) scale(1.05);
}

/* Footer */
footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skill-item,
.project-card,
.contact-link {
    animation: fadeUp 0.6s ease both;
}

/* Responsive */
@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .header-content {
        flex-wrap: wrap;
    }

    .controls {
        width: 100%;
        justify-content: flex-end;
    }

    .footer-content {
        flex-direction: column;
        gap: 6px;
    }
}