:root {
    --bg-page: #f0f2f5;
    --bg-card: #ffffff;
    --text-primary: #333;
    --text-heading: #1a73e8;
    --number-bg: #e8f0fe;
    --number-border: #d2e3fc;
    --number-color: #1967d2;
    --btn-bg: #1a73e8;
    --btn-hover: #1867c0;
    --btn-shadow: rgba(26, 115, 232, 0.2);
    --btn-hover-shadow: rgba(26, 115, 232, 0.3);
    --card-shadow: rgba(0, 0, 0, 0.12);
    --toggle-bg: #e2e8f0;
    --toggle-color: #555;
    --toggle-hover: #d0d7e2;
}

body.dark {
    --bg-page: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #e2e8f0;
    --text-heading: #60a5fa;
    --number-bg: #1e3a5f;
    --number-border: #2d5a8e;
    --number-color: #93c5fd;
    --btn-bg: #2563eb;
    --btn-hover: #1d4ed8;
    --btn-shadow: rgba(37, 99, 235, 0.3);
    --btn-hover-shadow: rgba(37, 99, 235, 0.5);
    --card-shadow: rgba(0, 0, 0, 0.4);
    --toggle-bg: #334155;
    --toggle-color: #e2e8f0;
    --toggle-hover: #475569;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 2rem 1rem;
    box-sizing: border-box;
    gap: 1.5rem;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--bg-card);
    border-radius: 12px;
    box-shadow: 0 8px 30px var(--card-shadow);
    padding: 2rem;
    text-align: center;
    width: 90%;
    max-width: 400px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

h1 {
    color: var(--text-heading);
    font-size: 2rem;
    margin: 0;
    transition: color 0.3s;
}

.theme-toggle {
    position: absolute;
    right: 0;
    background-color: var(--toggle-bg);
    color: var(--toggle-color);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.2s;
}

.theme-toggle:hover {
    background-color: var(--toggle-hover);
    transform: scale(1.1);
}

.lotto-display {
    margin: 2rem 0;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.lotto-number {
    background-color: var(--number-bg);
    border: 1px solid var(--number-border);
    border-radius: 50%;
    color: var(--number-color);
    font-size: 1.5rem;
    font-weight: bold;
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s, background-color 0.3s, color 0.3s;
}

.lotto-number:hover {
    transform: translateY(-5px);
}

.generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px var(--btn-shadow);
}

.generate-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 6px 16px var(--btn-hover-shadow);
}

/* 제휴 문의 폼 */
:root {
    --input-bg: #f8fafc;
    --input-border: #cbd5e1;
    --input-focus: #1a73e8;
    --label-color: #555;
}

body.dark {
    --input-bg: #0f172a;
    --input-border: #334155;
    --input-focus: #60a5fa;
    --label-color: #94a3b8;
}

.form-container {
    text-align: left;
}

.disqus-container {
    margin-top: 2rem;
}

.form-title {
    color: var(--text-heading);
    font-size: 1.4rem;
    margin: 0 0 1.5rem 0;
    text-align: center;
    transition: color 0.3s;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--label-color);
    transition: color 0.3s;
}

.form-group input,
.form-group textarea {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    padding: 0.65rem 0.85rem;
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s, background-color 0.3s, color 0.3s;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--input-focus);
}

.submit-btn {
    width: 100%;
    margin-top: 0.5rem;
}

.form-success {
    text-align: center;
    color: #16a34a;
    font-weight: 600;
    margin-top: 1rem;
}

body.dark .form-success {
    color: #4ade80;
}

.hidden {
    display: none;
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .lotto-number {
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
}