:root {
    --bg-color: #f8fafc;
    --container-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --number-bg: #f1f5f9;
    --number-text: #0f172a;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

.dark-mode {
    --bg-color: #0f172a;
    --container-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --number-bg: #334155;
    --number-text: #f1f5f9;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 20px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);
    width: 90%;
    max-width: 500px;
}

.header {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

h1 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 2rem;
    font-weight: 800;
}

.description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.numbers-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 2.5rem 0;
}

.number {
    width: 55px;
    height: 55px;
    border-radius: 16px;
    background-color: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--number-text);
    box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.06);
}

#generate-btn {
    background-color: var(--accent-color);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    width: 100%;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.5);
}

#generate-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

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

.partnership-section {
    margin-top: 3rem;
    padding-top: 1rem;
    text-align: left;
}

.divider {
    border: 0;
    border-top: 1px solid var(--number-bg);
    margin-bottom: 2rem;
}

.partnership-section h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

#inquiry-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border-radius: 10px;
    border: 1px solid var(--number-bg);
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    box-sizing: border-box;
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.submit-btn {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 0.8rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.submit-btn:hover {
    background-color: var(--accent-color);
    color: white;
}