:root {
    --bg-color: #f0f2f5;
    --bg-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill='%23d9d9d9' fill-opacity='0.1'%3E%3Crect x='0' y='0' width='100' height='100'/%3E%3C/g%3E%3C/svg%3E");
    --container-bg: #ffffff;
    --container-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    --title-color: #333333;
    --text-color: #333333;
    --number-bg: #f7f7f7;
    --number-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.1);
    --btn-bg: #4a90e2;
    --btn-bg-hover: #357abd;
    --btn-color: #ffffff;
    --theme-btn-bg: #1f2937;
    --theme-btn-bg-hover: #111827;
    --theme-btn-color: #ffffff;
}

body.dark-mode {
    --bg-color: #0f172a;
    --bg-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='%2394a3b8' fill-opacity='0.08'%3E%3Ccircle cx='40' cy='40' r='3'/%3E%3C/g%3E%3C/svg%3E");
    --container-bg: #111827;
    --container-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
    --title-color: #f3f4f6;
    --text-color: #e5e7eb;
    --number-bg: #1f2937;
    --number-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.35);
    --btn-bg: #0ea5e9;
    --btn-bg-hover: #0284c7;
    --btn-color: #ffffff;
    --theme-btn-bg: #f3f4f6;
    --theme-btn-bg-hover: #d1d5db;
    --theme-btn-color: #111827;
}

body {
    background-color: var(--bg-color);
    background-image: var(--bg-image);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--container-shadow);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    color: var(--title-color);
    margin-bottom: 2rem;
}

h2 {
    color: var(--title-color);
    margin: 0 0 1rem;
    font-size: 1.2rem;
}

#generate {
    background-color: var(--btn-bg);
    color: var(--btn-color);
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 12px 0 rgba(74, 144, 226, 0.5);
}

#generate:hover {
    background-color: var(--btn-bg-hover);
    transform: translateY(-2px);
}

#generate:active {
    transform: translateY(0);
}

#numbers {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.number {
    width: 60px;
    height: 60px;
    background-color: var(--number-bg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: var(--number-shadow);
    transition: transform 0.2s ease;
}

.number:hover {
    transform: scale(1.1);
}

#theme-toggle {
    background-color: var(--theme-btn-bg);
    color: var(--theme-btn-color);
    border: none;
    padding: 0.65rem 1.2rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#theme-toggle:hover {
    background-color: var(--theme-btn-bg-hover);
    transform: translateY(-1px);
}

.divider {
    border: 0;
    border-top: 1px solid rgba(148, 163, 184, 0.35);
    margin: 0 0 1.5rem;
}

.partner-section {
    text-align: left;
}

.partner-form {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.partner-form label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
}

.partner-form input,
.partner-form textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 0.75rem 0.9rem;
    border-radius: 8px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    background-color: var(--number-bg);
    color: var(--text-color);
    font: inherit;
}

.partner-form textarea {
    resize: vertical;
}

.partner-form input:focus,
.partner-form textarea:focus {
    outline: 2px solid rgba(74, 144, 226, 0.45);
    outline-offset: 1px;
}

.submit-btn {
    margin-top: 0.5rem;
    background-color: var(--btn-bg);
    color: var(--btn-color);
    border: none;
    border-radius: 8px;
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.submit-btn:hover {
    background-color: var(--btn-bg-hover);
    transform: translateY(-1px);
}

.comments-section {
    text-align: left;
}

#disqus_thread {
    margin-top: 0.75rem;
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
    }
    .number {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}