:root {
    --bg-color: #f6f3ed;
    --text-color: #111;
    --desc-color: #333;
    --sub-color: #666;
    --card-bg: rgba(255, 255, 255, 0.35);
    --card-border: rgba(0, 0, 0, 0.08);
    --toggle-bg: rgba(255, 255, 255, 0.4);
    --mandala-light-opacity: 0.05;
    --mandala-dark-opacity: 0;
    --toggle-border: rgba(0, 0, 0, 0.08);
    --toggle-icon-color: #111;
    --transition-speed: 0.5s;
}

.dark-theme {
    --bg-color: #121212;
    --text-color: #f6f3ed;
    --desc-color: #ccc;
    --sub-color: #aaa;
    --card-bg: rgba(30, 30, 30, 0.45);
    --card-border: rgba(255, 255, 255, 0.08);
    --toggle-bg: rgba(30, 30, 30, 0.5);
    --mandala-light-opacity: 0;
    --mandala-dark-opacity: 0.025;
    --toggle-border: rgba(255, 255, 255, 0.1);
    --toggle-icon-color: #f6f3ed;
}

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

html,
body {
    min-height: 100vh;
    overflow-x: hidden;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Background Mandala - Light Theme */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: url("/static/images/mandala-monochrome.png") center/cover;
    opacity: var(--mandala-light-opacity);
    filter: grayscale(100%);
    mix-blend-mode: normal;
    z-index: -2;
    transition: opacity var(--transition-speed) ease;
}

/* Background Mandala - Dark Theme */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    background: url("/static/images/mandala-monochrome.png") center/cover;
    opacity: var(--mandala-dark-opacity);
    filter: invert(1) grayscale(100%);
    mix-blend-mode: normal;
    z-index: -2;
    transition: opacity var(--transition-speed) ease;
}

.container {
    max-width: 1100px;
    height: 100vh;
    margin: auto;
    padding: 40px 40px 24px 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 30px;
    right: 30px;
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow var(--transition-speed) ease;
    z-index: 1001;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.theme-toggle:hover {
    transform: scale(1.05);
}

.theme-toggle svg {
    fill: var(--toggle-icon-color);
    width: 20px;
    height: 20px;
    transition: transform 0.5s ease, fill var(--transition-speed) ease;
}

.theme-toggle:hover svg {
    transform: rotate(30deg);
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

body.dark-theme .theme-toggle .sun-icon {
    display: block;
}

body.dark-theme .theme-toggle .moon-icon {
    display: none;
}

/* What I Build Section */
.section {
    margin-top: 140px;
}

.section h2 {
    font-size: 3rem;
    margin-bottom: 25px;
    transition: color var(--transition-speed) ease;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--card-border);
    padding: 25px;
    border-radius: 16px;
    transition: background var(--transition-speed) ease, border var(--transition-speed) ease, transform 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
}

.card h3 {
    margin-bottom: 10px;
}

.card p {
    color: var(--desc-color);
    line-height: 1.6;
    transition: color var(--transition-speed) ease;
}

footer {
    padding: 20px 0 10px 0;
    text-align: center;
    color: var(--sub-color);
    transition: color var(--transition-speed) ease;
}



@media (max-width: 768px) {
    .container {
        padding: 30px 20px 20px 20px;
    }
}