/* ===== MOBILE DPI SCALING (Samsung Ultra fix) ===== */
html {
    font-size: clamp(18px, 1.2vw + 1.2vh, 22px);
}

* {
    box-sizing: border-box;
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
}

body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: clamp(16px, 4vw, 32px);
}

/* ===== FORM CONTAINER ===== */
.form-container {
    background: #ffffff;
    width: 100%;
    max-width: 560px;
    padding: clamp(24px, 5vw, 40px);
    border-radius: 16px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.25);
}

.form-container h2 {
    text-align: center;
    margin-bottom: 1.4em;
    color: #333;
    font-size: 1.6rem;
}

/* ===== LABELS ===== */
.form-group {
    margin-bottom: 1.2em;
}

.form-group label {
    display: block;
    margin-bottom: 0.35em;
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.required {
    color: red;
    margin-left: 4px;
    font-weight: bold;
}

/* ===== INPUT ===== */
.form-group input {
    width: 100%;
    padding: 0.8em 0.9em;
    border-radius: 10px;
    border: 1px solid #ccc;
    font-size: 1rem;
    transition: 0.25s;
}

.form-group input:focus {
    border-color: #667eea;
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

/* ===== BUTTON ===== */
button {
    width: 100%;
    padding: 0.9em;
    background: #667eea;
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.25s, transform 0.08s;
}

button:hover {
    background: #5a67d8;
}

button:active {
    transform: scale(0.97);
}

/* ===== ULTRA MOBILE (S25 / Pixel Pro / iPhone Pro Max) ===== */
@media (max-width: 480px) and (min-resolution: 300dpi) {
    html {
        font-size: 20px;
    }

    .form-container {
        max-width: 100%;
        padding: 26px 18px;
        border-radius: 14px;
    }

    .form-group input {
        padding: 0.9em;
        font-size: 1.05rem;
    }

    button {
        padding: 1em;
        font-size: 1.1rem;
    }
}

/* ===== SMALL MOBILE ===== */
@media (max-width: 380px) {
    html {
        font-size: 18px;
    }

    .form-container {
        padding: 22px 16px;
    }
}

/* ===== LARGE DESKTOP ===== */
@media (min-width: 1400px) {
    html {
        font-size: 22px;
    }
}