:root {
    --navy-deep: #060b1a;
    --navy: #0b1330;
    --navy-card: #101c40;
    --navy-border: #1e3a66;
    --blue-light: #4fc3f7;
    --blue-glow: #7fdbff;
    --text: #eaf2ff;
    --text-muted: #8fa4c9;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Arial', sans-serif;
    background: radial-gradient(circle at top, var(--navy) 0%, var(--navy-deep) 70%);
    color: var(--text);
    text-align: center;
    margin: 0;
    padding: 40px 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

h2 {
    font-size: 26px;
    color: var(--blue-glow);
    margin-bottom: 24px;
    text-shadow: 0 0 12px rgba(79, 195, 247, 0.35);
}

form,
#thankYouScreen {
    background: linear-gradient(160deg, var(--navy-card) 0%, var(--navy) 100%);
    padding: 32px 28px;
    border-radius: 16px;
    border: 1px solid var(--navy-border);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45), 0 0 30px rgba(79, 195, 247, 0.08);
    text-align: center;
    width: 350px;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 6px;
    align-self: flex-start;
}

input {
    width: 100%;
    padding: 12px 14px;
    margin-bottom: 16px;
    border: 1px solid var(--navy-border);
    border-radius: 8px;
    background-color: rgba(6, 11, 26, 0.6);
    color: var(--text);
    font-size: 16px;
    transition: all 0.25s ease;
    text-align: center;
}

input::placeholder {
    color: #5b6d94;
}

input:focus {
    outline: none;
    border-color: var(--blue-light);
    box-shadow: 0 0 12px rgba(79, 195, 247, 0.55);
    background-color: rgba(6, 11, 26, 0.85);
}

button {
    width: 100%;
    padding: 13px;
    background: linear-gradient(135deg, var(--blue-light), #2196f3);
    border: none;
    border-radius: 8px;
    color: #061021;
    font-size: 17px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    margin-top: 8px;
    box-shadow: 0 4px 14px rgba(79, 195, 247, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 195, 247, 0.5);
}

button + button {
    margin-top: 12px;
    background: transparent;
    color: var(--blue-glow);
    border: 1px solid var(--navy-border);
    box-shadow: none;
}

button + button:hover {
    border-color: var(--blue-light);
    box-shadow: 0 0 12px rgba(79, 195, 247, 0.25);
}

.logo {
    width: 66%;
    height: auto;
    margin-bottom: 18px;
    filter: drop-shadow(0 0 10px rgba(79, 195, 247, 0.25));
}

#responseMessage {
    margin-top: 16px;
    font-size: 15px;
    font-weight: 600;
    color: var(--blue-glow);
    display: none; /* Başlangıçta gizli */
    padding: 10px;
    border-radius: 8px;
    background-color: rgba(79, 195, 247, 0.1);
    border: 1px solid var(--blue-light);
    width: 100%;
    text-align: center;
    transition: all 0.3s ease-in-out;
}

/* Başarılı mesaj için yeşil renk */
#responseMessage.success {
    color: #4ade80;
    background-color: rgba(74, 222, 128, 0.1);
    border-color: #4ade80;
}

/* Hata mesajı için kırmızı renk */
#responseMessage.error {
    color: #f87171;
    background-color: rgba(248, 113, 113, 0.1);
    border-color: #f87171;
}