:root {
    --primary: #00c6ff;
    --secondary: #0072ff;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --border-glass: rgba(255, 255, 255, 0.15);
}

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

body {
    font-family: 'Be Vietnam Pro', sans-serif;
    color: white;
    background-color: #050505;
    overflow-x: hidden;
}

/* ===== VIDEO NỀN ===== */
.video-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
}

.bg-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.overlay-dark {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0.7), rgba(0,0,0,0.9));
}

/* ===== BỐ CỤC CHÍNH (GRID) ===== */
.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 20px 80px 20px;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr; /* Cột trái nhỏ hơn cột phải một chút */
    gap: 60px;
    align-items: flex-start;
}

/* ===== LEFT INFO ===== */
.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.3);
    margin-bottom: 20px;
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.gradient-text {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: rgba(255,255,255,0.7);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 30px;
}

/* Thông tin liên hệ */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 25px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

    .info-item:last-child {
        margin-bottom: 0;
    }

    .info-item i {
        font-size: 32px;
        color: var(--primary);
    }

    .info-item h4 {
        font-size: 1rem;
        color: rgba(255,255,255,0.6);
        margin-bottom: 4px;
        font-weight: 400;
    }

    .info-item p {
        font-size: 1.1rem;
        font-weight: 600;
    }

/* Mạng xã hội */
.social-links {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.glass-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: white;
    font-size: 24px;
    text-decoration: none;
    transition: 0.3s;
}

    .glass-icon:hover {
        background: var(--primary);
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0, 198, 255, 0.4);
    }

/* Bản đồ Dark Mode Trick */
.map-container {
    padding: 10px;
    height: 250px;
    overflow: hidden;
}

    .map-container iframe {
        width: 100%;
        height: 100%;
        border: none;
        border-radius: 12px;
        /* TRICK BIẾN MAP THÀNH MÀU ĐEN CỰC XỊN */
        filter: invert(90%) hue-rotate(180deg) grayscale(20%) contrast(1.2);
        transition: 0.3s;
    }

        .map-container iframe:hover {
            filter: invert(0%);
        }
/* Rê chuột vào hiện màu thật */

/* ===== RIGHT FORM ===== */
.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(25px);
    border: 1px solid var(--border-glass);
    border-radius: 24px;
    padding: 50px 40px;
    box-shadow: 0 25px 50px rgba(0,0,0,0.4);
}

    .glass-card h2 {
        font-size: 2rem;
        margin-bottom: 30px;
        text-align: center;
    }

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: rgba(255,255,255,0.5);
    z-index: 2;
    transition: 0.3s;
}

.top-icon {
    top: 22px;
    transform: translateY(0);
}
/* Icon cho textarea */

.input-group input, .input-group textarea {
    width: 100%;
    padding: 16px 16px 16px 48px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(0, 0, 0, 0.4);
    color: white;
    font-size: 16px;
    outline: none;
    transition: 0.3s;
}

.input-group textarea {
    min-height: 150px;
    resize: none;
    padding-top: 20px;
}

.input-group label {
    position: absolute;
    left: 48px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255,255,255,0.5);
    pointer-events: none;
    transition: 0.3s;
}

.textarea-group label {
    top: 22px;
    transform: translateY(0);
}

/* Hiệu ứng Focus Input (Giống Form Login) */
.input-group input:focus, .input-group textarea:focus,
.input-group input:valid, .input-group textarea:valid {
    background: rgba(0, 0, 0, 0.6);
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(0, 198, 255, 0.2);
}

    .input-group input:focus ~ label, .input-group input:valid ~ label,
    .input-group textarea:focus ~ label, .input-group textarea:valid ~ label {
        top: -10px;
        left: 15px;
        font-size: 12px;
        padding: 0 8px;
        background: #0c0e12;
        color: var(--primary);
        border-radius: 4px;
    }

    .input-group input:focus ~ .input-icon, .input-group textarea:focus ~ .input-icon,
    .input-group input:valid ~ .input-icon, .input-group textarea:valid ~ .input-icon {
        color: var(--primary);
    }

/* ===== BUTTON & ALERT ===== */
.btn-liquid {
    width: 100%;
    padding: 16px;
    border-radius: 14px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    margin-top: 10px;
    transition: 0.3s;
}

    .btn-liquid:hover {
        transform: translateY(-3px);
        box-shadow: 0 15px 30px rgba(0, 114, 255, 0.4);
    }

.alert-success {
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid rgba(0, 255, 204, 0.3);
    color: #00ffcc;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

/* ===== ANIMATION ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    animation: fadeUp 0.8s ease forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* CSS Loader */
.loading .btn-text {
    opacity: 0;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
    /* Gộp thành 1 cột dọc */
    .glass-card {
        padding: 40px 20px;
    }
}