:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #000000;
    --secondary-bg: #f5f5f5;
    --border-color: #e0e0e0;
    --input-bg: #ffffff;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #ffffff;
    --accent-color: #ffffff;
    --secondary-bg: #111111;
    --border-color: #333333;
    --input-bg: #0a0a0a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    padding: 2rem 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.hero {
    text-align: center;
    padding: 4rem 0 2rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.7;
    margin-bottom: 3rem;
}

.tabs {
    display: inline-flex;
    background: var(--secondary-bg);
    padding: 0.5rem;
    border-radius: 50px;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.8rem 2rem;
    border: none;
    background: transparent;
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    border-radius: 50px;
    transition: var(--transition);
    opacity: 0.6;
}

.tab-btn.active {
    background: var(--bg-color);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.waitlist-form {
    display: none;
    background: var(--secondary-bg);
    padding: 3rem;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

.waitlist-form.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

input, textarea, select {
    width: 100%;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--text-color);
}

textarea {
    height: 120px;
    resize: vertical;
}

.btn-primary {
    width: 100%;
    padding: 1.2rem;
    background: var(--accent-color);
    color: var(--bg-color);
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--secondary-bg);
}

.hidden {
    display: none;
}

#success-message {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--secondary-bg);
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

.success-icon {
    margin-bottom: 1.5rem;
}

.btn-secondary {
    margin-top: 2rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.8rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
}

footer {
    padding: 4rem 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.5;
}

@media (max-width: 600px) {
    h1 { font-size: 2.5rem; }
    .form-grid { grid-template-columns: 1fr; }
    .waitlist-form { padding: 1.5rem; }
}