:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
    --btn-bg: #2563eb;
    --btn-hover: #1d4ed8;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --input-border: #e2e8f0;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --card-bg: #1e293b;
    --btn-bg: #3b82f6;
    --btn-hover: #60a5fa;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --input-border: #334155;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

main {
    max-width: 500px;
    width: 90%;
    padding: 3rem 2rem;
    background-color: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s;
}

.site-header {
    margin-bottom: 2.5rem;
}

.site-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.site-header p {
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.95rem;
    line-height: 1.5;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

#theme-btn {
    background: var(--card-bg);
    border: 1px solid var(--input-border);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 9999px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

input, textarea, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--input-border);
    border-radius: 10px;
    background-color: var(--card-bg);
    color: var(--text-color);
    box-sizing: border-box;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--btn-bg);
    ring: 2px solid var(--btn-bg);
}

textarea {
    height: 120px;
    resize: none;
}

#submit-btn {
    width: 100%;
    padding: 1rem;
    background-color: var(--btn-bg);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: transform 0.1s, background-color 0.2s;
    margin-top: 1rem;
}

#submit-btn:hover {
    background-color: var(--btn-hover);
}

#submit-btn:active {
    transform: scale(0.98);
}

.site-footer {
    margin-top: 2.5rem;
    font-size: 0.75rem;
    opacity: 0.5;
}