@import url('./base.css');

/* === DIFFICULTY-SPECIFIC VARIABLES === */
:root {
    /* Difficulty-specific colors using existing palette */
    --color-easy: var(--color-text-accent);
    --color-medium: #d29922;
    --color-hard: #f85149;
}

body {
    margin: 0;
    font-family: var(--font-family-mono);
    background-color: var(--color-bg-body);
    color: var(--color-text-primary);
    min-height: 100vh;
    background: 
        radial-gradient(circle at 30% 50%, rgba(0, 255, 136, 0.1), transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(255, 107, 53, 0.1), transparent 50%),
        var(--color-bg-body);
}

/* === HEADER === */
.header {
    width: 100%;
    background: transparent;
    padding: 12px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-text {
    font-size: 24px;
    margin: 0;
    color: var(--color-text-accent);
    font-weight: bold;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: transparent;
    color: var(--color-text-primary);
    text-decoration: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    font-weight: 500;
    font-family: var(--font-family-mono);
    font-size: 12px;
    transition: all 0.2s ease;
}

.back-button:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-accent);
}

/* === MAIN CONTENT === */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

.title-section {
    text-align: center;
    margin-bottom: 60px;
}

.main-title {
    font-size: 48px;
    font-weight: 700;
    margin: 0 0 20px 0;
    background: linear-gradient(135deg, var(--color-text-accent), var(--color-connection-selected));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 18px;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* === DIFFICULTY CARDS === */
.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.difficulty-card {
    background: var(--color-bg-component);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-large);
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.difficulty-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.difficulty-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    background-color: var(--color-bg-hover);
}

.difficulty-card:hover::before {
    opacity: 1;
}

.difficulty-card.easy {
    border-color: var(--color-easy);
}

.difficulty-card.easy:hover {
    border-color: var(--color-easy);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.3);
}

.difficulty-card.medium {
    border-color: var(--color-medium);
}

.difficulty-card.medium:hover {
    border-color: var(--color-medium);
    box-shadow: 0 10px 30px rgba(210, 153, 34, 0.3);
}

.difficulty-card.hard {
    border-color: var(--color-hard);
}

.difficulty-card.hard:hover {
    border-color: var(--color-hard);
    box-shadow: 0 10px 30px rgba(248, 81, 73, 0.3);
}

.difficulty-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.difficulty-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    background: var(--color-bg-dark);
    border: 1px solid var(--color-border-panel);
}

.difficulty-card.easy .difficulty-icon {
    color: var(--color-easy);
    border-color: var(--color-easy);
}

.difficulty-card.medium .difficulty-icon {
    color: var(--color-medium);
    border-color: var(--color-medium);
}

.difficulty-card.hard .difficulty-icon {
    color: var(--color-hard);
    border-color: var(--color-hard);
}

.difficulty-title {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
    color: var(--color-text-white);
}

.difficulty-description {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 25px;
    line-height: 1.5;
}

.difficulty-features {
    list-style: none;
    padding: 0;
    margin: 0 0 25px 0;
}

.difficulty-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--color-text-primary);
}

.difficulty-features li::before {
    content: '✓';
    font-weight: bold;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 12px;
    background: var(--color-bg-dark);
    border: 1px solid var(--color-border);
}

.difficulty-card.easy .difficulty-features li::before {
    color: var(--color-easy);
    border-color: var(--color-easy);
}

.difficulty-card.medium .difficulty-features li::before {
    color: var(--color-medium);
    border-color: var(--color-medium);
}

.difficulty-card.hard .difficulty-features li::before {
    color: var(--color-hard);
    border-color: var(--color-hard);
}

.difficulty-stats {
    background: var(--color-bg-dark);
    border: 1px solid var(--color-border-panel);
    border-radius: var(--radius-medium);
    padding: 16px;
    margin-bottom: 25px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-white);
}

.select-button {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: var(--radius-medium);
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-family-mono);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--color-button);
    color: var(--color-text-white);
}

.select-button:hover {
    background: var(--color-bg-accent);
    transform: translateY(-2px);
}

.select-button:disabled {
    background: var(--color-button-disabled);
    cursor: not-allowed;
    transform: none;
}

.difficulty-card.easy .select-button {
    border: 1px solid var(--color-easy);
}

.difficulty-card.easy .select-button:hover {
    border-color: var(--color-easy);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.difficulty-card.medium .select-button {
    border: 1px solid var(--color-medium);
}

.difficulty-card.medium .select-button:hover {
    border-color: var(--color-medium);
    box-shadow: 0 0 10px rgba(210, 153, 34, 0.3);
}

.difficulty-card.hard .select-button {
    border: 1px solid var(--color-hard);
}

.difficulty-card.hard .select-button:hover {
    border-color: var(--color-hard);
    box-shadow: 0 0 10px rgba(248, 81, 73, 0.3);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .difficulty-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .main-title {
        font-size: 36px;
    }

    .difficulty-card {
        padding: 20px;
    }

    .main-container {
        padding: 40px 16px;
    }
}

/* === ANIMATIONS === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.difficulty-card {
    animation: fadeInUp 0.6s ease forwards;
}

.difficulty-card:nth-child(1) {
    animation-delay: 0.1s;
}

.difficulty-card:nth-child(2) {
    animation-delay: 0.2s;
}

.difficulty-card:nth-child(3) {
    animation-delay: 0.3s;
}