:root {
    --bg: #14121a;
    --card-bg: #1e1b28;
    --accent: #ff6b6b;
    --accent-hover: #ff8787;
    --text: #f4f2f8;
    --text-dim: #a9a3b8;
    --border: #322d40;
    --success: #6bff9e;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: radial-gradient(circle at top, #241f30, var(--bg));
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.card {
    width: 100%;
    max-width: 520px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 36px 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.hero {
    text-align: center;
    margin-bottom: 28px;
}

.hero h1 {
    margin: 0;
    font-size: 2.4rem;
    letter-spacing: 0.02em;
    background: linear-gradient(90deg, var(--accent), #ffd166);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.tagline {
    margin: 8px 0 0;
    color: var(--text-dim);
    font-size: 1rem;
}

h2 {
    margin: 0 0 8px;
    font-size: 1.3rem;
}

.subtext {
    color: var(--text-dim);
    font-size: 0.92rem;
    line-height: 1.5;
    margin: 0 0 20px;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
    margin-bottom: 8px;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 10px;
    background: #26212f;
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-size: 0.92rem;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.social-btn:hover {
    border-color: var(--accent);
}

.social-btn.selected {
    border-color: var(--accent);
    background: rgba(255, 107, 107, 0.12);
}

.icon {
    font-size: 1.1rem;
}

.selected-note {
    color: var(--success);
    font-size: 0.88rem;
    margin: 4px 0 18px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 12px;
}

label {
    font-size: 0.85rem;
    color: var(--text-dim);
}

input[type="email"] {
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #14121a;
    color: var(--text);
    font-size: 1rem;
}

input[type="email"]:focus {
    outline: none;
    border-color: var(--accent);
}

#submit-btn {
    margin-top: 6px;
    padding: 13px;
    border: none;
    border-radius: 10px;
    background: var(--accent);
    color: #1a1420;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.15s ease;
}

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

#submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-error {
    color: #ff8787;
    font-size: 0.88rem;
    margin: 0;
}

#thank-you-section {
    text-align: center;
}

.thank-you-message {
    font-size: 1.15rem;
    line-height: 1.5;
}

footer {
    margin-top: 28px;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.8rem;
}