:root {
    --bg-color: #fff0f6;
    --surface-color: rgba(255, 255, 255, 0.7);
    --surface-bright: rgba(255, 255, 255, 0.9);
    --text-primary: #2d3436;
    --text-secondary: #4b4b4b;
    --accent-gradient: linear-gradient(135deg, #f783ac 0%, #da77f2 50%, #845ef7 100%);
    --accent-color: #845ef7;
    --border-color: #2d3436; 
    --border-width: 4px; /* Increased for more brutalism */
    --radius-lg: 0px; 
    --radius-md: 0px;
    --spacing: 2.5rem;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-brutal: 'Space Grotesk', sans-serif;
    --shadow-brutal: 10px 10px 0px 0px #2d3436;
    --glass-blur: blur(15px);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(247, 131, 172, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(132, 94, 247, 0.25) 0%, transparent 50%),
        linear-gradient(45deg, rgba(255, 255, 255, 0.3) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.3) 50%, rgba(255, 255, 255, 0.3) 75%, transparent 75%, transparent);
    background-size: 100% 100%, 100% 100%, 60px 60px;
    color: var(--text-primary);
    line-height: 1.5;
    padding: 4rem 2rem;
    min-height: 100vh;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
}

/* Navbar */
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    border: var(--border-width) solid var(--border-color);
    box-shadow: 6px 6px 0px 0px #2d3436;
    padding: 1rem 2rem;
    margin-bottom: 4rem;
    position: sticky;
    top: 2rem;
    z-index: 1000;
}

.nav-brand a {
    font-family: var(--font-brutal);
    font-size: 1.5rem;
    font-weight: 900;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-brand a span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-item {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-family: var(--font-brutal);
    text-transform: uppercase;
    font-size: 0.9rem;
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
}

.nav-item:hover {
    border-bottom: 3px solid var(--accent-color);
    transform: translateY(-2px);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-left: 1.5rem;
    border-left: 2px solid var(--border-color);
}

.username {
    font-weight: 900;
    font-size: 0.8rem;
    background: #2d3436;
    color: white;
    padding: 0.2rem 0.6rem;
}

.logout-link {
    color: #e03131;
    font-weight: 900;
    text-decoration: none;
    font-size: 0.8rem;
    text-transform: uppercase;
}

header {
    margin-bottom: 5rem;
    text-align: left;
    padding: 2rem;
    border: var(--border-width) solid var(--border-color);
    background: white;
    box-shadow: var(--shadow-brutal);
    display: inline-block;
}

.hero-title {
    font-family: var(--font-brutal);
    font-size: 6rem;
    font-weight: 900;
    text-transform: uppercase;
    line-height: 0.85;
    margin-bottom: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(6px 6px 0px #2d3436);
}

.hero-subtitle {
    font-family: var(--font-brutal);
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    background: #da77f2;
    color: white;
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border: var(--border-width) solid var(--border-color);
}

.grid-layout, .grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.panel {
    background: var(--surface-color);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--border-width) solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-brutal);
    transition: all 0.15s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: var(--accent-gradient);
}

.panel:hover {
    transform: translate(-6px, -6px);
    box-shadow: 16px 16px 0px 0px #2d3436;
}

.panel-title {
    font-family: var(--font-brutal);
    font-size: 2.25rem;
    font-weight: 900;
    margin-bottom: 2.5rem;
    text-transform: uppercase;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    color: var(--text-primary);
}

.control-group {
    margin-bottom: 2rem;
}

.control-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 800;
    text-transform: uppercase;
}

.slider {
    width: 100%;
    height: 12px;
    background: white;
    border: var(--border-width) solid var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 30px;
    height: 30px;
    background: var(--accent-color);
    border: var(--border-width) solid var(--border-color);
    cursor: pointer;
    box-shadow: 4px 4px 0px var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    font-family: var(--font-brutal);
    padding: 1.5rem 1rem;
    text-align: left;
    color: white;
    background: var(--border-color);
    font-size: 0.95rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.data-table td {
    padding: 1.5rem 1rem;
    border-bottom: var(--border-width) solid var(--border-color);
    font-size: 1.1rem;
    font-weight: 600;
}

.btn {
    font-family: var(--font-brutal);
    background: var(--accent-gradient);
    color: #fff;
    border: var(--border-width) solid var(--border-color);
    padding: 1.25rem 2.5rem;
    cursor: pointer;
    font-weight: 900;
    text-transform: uppercase;
    font-size: 1.1rem;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    box-shadow: 6px 6px 0px var(--border-color);
    display: inline-block;
}

.btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0px var(--border-color);
}

.btn:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0px var(--border-color);
}

.btn:disabled {
    background: #ced4da;
    background-image: none;
    color: #495057;
    cursor: not-allowed;
    box-shadow: 4px 4px 0px var(--border-color);
}

.form-group {
    margin-bottom: 2rem;
}

.form-group label {
    display: block;
    font-size: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.form-control {
    width: 100%;
    padding: 1.25rem 1.5rem;
    background-color: white;
    border: var(--border-width) solid var(--border-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
}

.form-control:focus {
    outline: none;
    box-shadow: 6px 6px 0px var(--accent-color);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 900;
    text-transform: uppercase;
    background: #b2f2bb;
    color: #2b8a3e;
    border: var(--border-width) solid var(--border-color);
    box-shadow: 4px 4px 0px var(--border-color);
    margin-top: 1.5rem;
}

.math-explanation {
    background: rgba(255, 255, 255, 0.5);
    padding: 2rem;
    border: var(--border-width) solid var(--border-color);
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 1.5rem;
    color: var(--text-primary);
    box-shadow: inset 4px 4px 0px rgba(0,0,0,0.05);
}

.command-block {
    background: #2d3436;
    color: #a5d8ff;
    padding: 1.5rem;
    border: var(--border-width) solid var(--accent-color);
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
    margin-top: 1.5rem;
    box-shadow: 6px 6px 0px var(--accent-color);
}

.command-input {
    background: transparent;
    border: none;
    color: white;
    width: 100%;
    font-family: inherit;
    font-size: 1.2rem;
    outline: none;
}

.command-input::placeholder {
    color: #adb5bd;
}

@media (max-width: 640px) {
    body {
        padding: 1.5rem 1rem;
    }
    .hero-title {
        font-size: 3rem;
    }
    .panel {
        padding: 1.5rem;
    }
}