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

:root {
    --primary: #6c63ff;
    --primary-dark: #5548e0;
    --accent: #ff6b6b;
    --success: #6bcb77;
    --warning: #ffd93d;
    --bg: #f0f4ff;
    --surface: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --border: #e0e7ff;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 20px rgba(108, 99, 255, 0.12);
    --shadow-nav: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 24px rgba(108, 99, 255, 0.2);
    --shadow-modal: 0 20px 60px rgba(0, 0, 0, 0.2);
    --gradient-brand: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --transition-btn: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
    --color-error-bg: #fff0f0;
    --color-success-bg: #e8fdf0;
    --color-success-text: #2d7a3a;
}

body {
    font-family: "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

.view {
    display: none;
    min-height: 100vh;
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.interactive-card {
    background: var(--surface);
    border: 3px solid transparent;
    box-shadow: var(--shadow);
    transition: var(--transition-btn);

    &:hover {
        transform: translateY(-4px) scale(1.02);
        border-color: var(--primary);
        box-shadow: var(--shadow-hover);
    }
}

.error-msg {
    background: var(--color-error-bg);
    color: var(--accent);
    border: 1px solid #ffd0d0;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.9rem;
    display: none;
}

a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;

    &:hover {
        text-decoration: underline;
    }
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}


hr {
    margin: 20px 0; 
    border-color: var(--border);
}

@media (max-width: 768px) {
    button {
        width: 100%;
        justify-content: center;
    }
}