/* Portfolio Design System */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&display=swap');

:root {
    /* Light Theme Defaults */
    --bg-color: #f5f7fa;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --card-bg: #ffffff;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --accent: #0984e3;
    --accent-hover: #74b9ff;
    --header-bg: rgba(255, 255, 255, 0.9);
    --border-color: #dfe6e9;
}

[data-theme="dark"] {
    /* Dark Theme Overrides */
    --bg-color: #121212;
    --text-primary: #dfe6e9;
    --text-secondary: #b2bec3;
    --card-bg: #1e1e1e;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --accent: #00cec9;
    --accent-hover: #81ecec;
    --header-bg: rgba(18, 18, 18, 0.9);
    --border-color: #2d3436;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Header --- */
header {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-primary);
    padding: 10px;
    border-radius: 50%;
}

.theme-toggle:hover {
    background: var(--border-color);
}

/* --- Hero --- */
.hero {
    padding: 100px 0 60px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Grid Section --- */
.section-title {
    font-size: 1.8rem;
    margin: 60px 0 30px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--accent);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--accent);
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 20px;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
    margin-top: auto;
}

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

/* --- Footer --- */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

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