* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #1a0b2e, #2d1b4e, #0f051d);
    color: #e0d4f6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 550px;
}

.card {
    background: rgba(35, 18, 59, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(167, 119, 235, 0.3);
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), 0 0 20px rgba(167, 119, 235, 0.15);
}

h1 {
    font-size: 1.5rem;
    text-align: center;
    color: #f3e8ff;
    margin-bottom: 10px;
    line-height: 1.4;
    text-shadow: 0 0 10px rgba(216, 180, 254, 0.4);
}

.subtitle {
    text-align: center;
    font-size: 0.9rem;
    color: #c4b5fd;
    margin-bottom: 25px;
    line-height: 1.4;
}

.subtitle span {
    font-size: 0.8rem;
    color: #a78bfa;
    font-style: italic;
}

.input-group {
    margin-bottom: 18px;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: #ddd6fe;
    margin-bottom: 6px;
}

input[type="text"],
textarea {
    width: 100%;
    padding: 12px 15px;
    background: rgba(15, 5, 29, 0.6);
    border: 1px solid rgba(167, 119, 235, 0.3);
    border-radius: 10px;
    color: #fff;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: #c084fc;
    box-shadow: 0 0 10px rgba(192, 132, 252, 0.4);
    background: rgba(20, 8, 38, 0.9);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #9333ea, #7e22ce);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(147, 51, 234, 0.4);
    margin-top: 10px;
}

.submit-btn:hover {
    background: linear-gradient(135deg, #a855f7, #9333ea);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.6);
    transform: translateY(-2px);
}

.footer-tag {
    text-align: center;
    font-size: 0.8rem;
    color: #8b5cf6;
    font-weight: bold;
    letter-spacing: 1px;
}
/* Style cho thanh chuyển đổi ngôn ngữ */
.lang-switcher {
    display: flex;
    justify-content: flex-end;
    gap: 6px;
    margin-bottom: 15px;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #bfa1ff;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    background: rgba(191, 161, 255, 0.2);
    border-color: #bfa1ff;
}

.lang-btn.active {
    background: #bfa1ff;
    color: #1a102f;
    border-color: #bfa1ff;
}
.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
    margin-bottom: 25px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 28px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: linear-gradient(135deg, #a855f7, #ec4899);
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(168, 85, 247, 0.4);
}

.footer-tag {
    text-align: center;
    font-size: 0.8rem;
    color: #cbd5e1;
}
.social-links a svg {
    margin-right: 8px;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.social-links a:hover svg {
    transform: scale(1.15);
}