:root {
    --brand-yellow: #fde047;
    --brand-purple: #a855f7;
    --brand-orange: #f97316;
    --bg: #202124;
    --surface: #292a2d;
    --border: #3c4043;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --hover-bg: #35363a;
    --font-ui: system-ui, -apple-system, sans-serif;
    --font-code: 'Fira Code', monospace;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.landing-screen{
    width: 90%;
    max-width: 1000px;
    min-height: 560px;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 48px;
    box-shadow: 0 18px 40px rgb(0 0 0 / 40%);
    display: flex;
    align-items: stretch;
    gap: 64px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.difficulty-section {
    flex: 2;
    display: flex;
    flex-direction: column;
}

.difficulty-stack {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.difficulty-button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hover-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.difficulty-button:hover {
    border-color: var(--brand-purple);
    background: rgb(204 71 253 / 8%);
}

.level-section {
    flex: 3;
    display: flex;
    flex-direction: column;
}

.level-stack {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 12px;
}

.level-button {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hover-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.level-button:hover {
    border-color: var(--brand-yellow);
    background: rgb(253 224 71 / 8%);
}

.start-section {
    display: flex;
    justify-content: flex-end;
    margin-top: 20px;
  }

.start-button {
    background: var(--hover-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 15px;
    font-weight: 600;
    padding: 10px 32px;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.start-button:hover {
    border-color: var(--brand-orange);
    background: rgb(249 116 22 / 17.7%);
}