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

:root {
    /* Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fafafa;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --divider: #d2d2d7;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.06);
    --shadow: rgba(0, 0, 0, 0.08);
    --toggle-bg: #f0f0f2;
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #161618;
    --text-primary: #f5f5f7;
    --text-secondary: #98989d;
    --accent: #0a84ff;
    --accent-hover: #409cff;
    --divider: #38383a;
    --card-bg: #1c1c1e;
    --card-border: rgba(255, 255, 255, 0.08);
    --shadow: rgba(0, 0, 0, 0.3);
    --toggle-bg: #2c2c2e;
}

@font-face {
    font-family: 'JetBrains Mono';
    src: url('./fonts/JetBrainsMono-VariableFont_wght.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'JetBrains Mono';
    src: url('./fonts/JetBrainsMono-VariableFont_wght.ttf') format('truetype');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

body {
    font-family: 'JetBrains Mono', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .header {
    background: rgba(0, 0, 0, 0.72);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 52px;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 24px;
}

.nav-left, .nav-center, .nav-right {
    display: flex;
    align-items: center;
}

.nav-center {
    gap: 40px;
    flex: 1;
    justify-content: center;
}

.nav-logo {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    opacity: 1;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--toggle-bg);
    border: none;
    border-radius: 50%;
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: block;
}

/* Sections */
.section {
    min-height: 100vh;
    padding: 140px 0 80px;
    display: flex;
    align-items: center;
}

.section-title {
    font-size: 44px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 56px;
    text-align: center;
}

/* Home Section */
.section-home {
    background-color: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
}

.hero-title {
    font-size: clamp(40px, 7vw, 72px);
    font-weight: 600;
    letter-spacing: -0.03em;
    text-align: center;
    line-height: 1.1;
    margin-bottom: 20px;
}

.highlight {
    background: linear-gradient(135deg, var(--accent), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 22px);
    color: var(--text-secondary);
    text-align: center;
    font-weight: 400;
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    padding: 12px 28px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    font-family: inherit;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--divider);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

/* Projects Section */
.section-projects {
    background-color: var(--bg-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    justify-content: center;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--shadow);
}

.project-image {
    width: 100%;
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-emoji {
    font-size: 48px;
}

.project-body {
    padding: 20px;
}

.project-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.project-description {
    color: var(--text-secondary);
    font-size: 12px;
    line-height: 1.6;
    margin-bottom: 14px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}

.tag {
    font-size: 11px;
    padding: 4px 10px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 100px;
    border: 1px solid var(--card-border);
}

.project-links {
    display: flex;
    gap: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--card-border);
}

.project-link {
    font-size: 12px;
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

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

/* About Section */
.section-about {
    background-color: var(--bg-secondary);
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
}

.about-text {
    font-size: 17px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.8;
}

/* Footer */
.footer {
    background-color: var(--bg-primary);
    padding: 32px;
    text-align: center;
    border-top: 1px solid var(--divider);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.footer p {
    color: var(--text-secondary);
    font-size: 12px;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Responsive */
@media (max-width: 900px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .nav-center {
        gap: 20px;
    }

    .nav-link {
        font-size: 12px;
    }

    .section-title {
        font-size: 32px;
        margin-bottom: 32px;
    }

    .section {
        padding: 120px 0 60px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
}