/* --- GLOBAL CONFIG --- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;600;800&display=swap');

:root {
    --bg: #030303;
    --primary: #00ffaa;
    --secondary: #bd00ff;
    --text: #ffffff;
    --glass: rgba(255, 255, 255, 0.03);
    --border: rgba(255, 255, 255, 0.08);
    --transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; cursor: none; }
body { 
    background-color: var(--bg); color: var(--text); 
    font-family: 'Plus Jakarta Sans', sans-serif; 
    line-height: 1.6; overflow-x: hidden;
}

/* --- CUSTOM CURSOR (HIỆU ỨNG 5 SAO) --- */
.cursor-dot { width: 6px; height: 6px; background: var(--primary); border-radius: 50%; position: fixed; pointer-events: none; z-index: 10001; }
.cursor-outline { 
    width: 40px; height: 40px; border: 1.5px solid var(--primary); border-radius: 50%; 
    position: fixed; pointer-events: none; z-index: 10000; transition: transform 0.15s ease-out; 
}

/* --- BÀI 1: HEADER STICKY & NAV --- */
header {
    position: fixed; width: 100%; top: 0; z-index: 1000;
    padding: 35px 10%; display: flex; justify-content: space-between; align-items: center;
    transition: var(--transition);
}
header.scrolled { padding: 18px 10%; background: rgba(3, 3, 3, 0.8); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); }

.logo { font-size: 26px; font-weight: 800; letter-spacing: -1.5px; }
.logo span { color: var(--primary); }

.nav-links { display: flex; list-style: none; gap: 45px; }
.nav-links a { 
    color: #fff; text-decoration: none; font-size: 13px; font-weight: 600; 
    text-transform: uppercase; letter-spacing: 2.5px; opacity: 0.4; transition: 0.4s;
}
.nav-links a.active, .nav-links a:hover { opacity: 1; color: var(--primary); text-shadow: 0 0 15px var(--primary); }

/* --- BÀI 2 & 3: HERO & REVEAL ANIMATION --- */
section { min-height: 100vh; padding: 140px 10%; display: flex; flex-direction: column; justify-content: center; }
.reveal { opacity: 0; transform: translateY(80px); filter: blur(10px); transition: 1.2s cubic-bezier(0.2, 1, 0.3, 1); }
.reveal.active { opacity: 1; transform: translateY(0); filter: blur(0); }

.hero-h1 { font-size: 11vw; line-height: 0.85; font-weight: 800; text-transform: uppercase; margin-bottom: 20px; }
.outline-txt { -webkit-text-stroke: 1.5px #fff; color: transparent; }

/* --- BÀI 5: BENTO GRID LAYOUT --- */
.bento-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 280px; gap: 20px; margin-top: 60px;
}
.bento-card {
    background: var(--glass); border: 1px solid var(--border); border-radius: 40px;
    padding: 50px; transition: 0.5s; position: relative; overflow: hidden;
}
.bento-card:hover { border-color: var(--primary); background: rgba(0, 255, 170, 0.04); transform: translateY(-10px); }
.bento-card h3 { font-size: 2rem; margin-bottom: 15px; color: var(--primary); }
.span-2 { grid-column: span 2; }
.row-2 { grid-row: span 2; }

/* --- BÀI 4: CONTACT FORM --- */
.contact-container { max-width: 850px; }
.input-group { position: relative; margin-bottom: 60px; }
.input-group input, .input-group textarea {
    width: 100%; background: transparent; border: none; border-bottom: 2px solid #222;
    padding: 15px 0; color: #fff; font-size: 1.4rem; outline: none; transition: 0.4s;
}
.input-group label { position: absolute; left: 0; top: 15px; color: #444; font-size: 1.2rem; transition: 0.4s; pointer-events: none; }
.input-group input:focus ~ label, .input-group input:valid ~ label { top: -35px; font-size: 0.9rem; color: var(--primary); }
.input-group input:focus { border-color: var(--primary); }

.btn-premium {
    padding: 22px 70px; background: var(--primary); border: none; border-radius: 100px;
    font-weight: 800; letter-spacing: 2px; text-transform: uppercase; cursor: pointer; transition: 0.4s;
}
.btn-premium:hover { transform: scale(1.05); box-shadow: 0 0 40px rgba(0, 255, 170, 0.4); }
/* --- HIỆU ỨNG CHO HÌNH ẢNH SỨ MỆNH --- */
section img {
    transition: var(--transition); /* Sử dụng biến transition bạn đã có */
    filter: grayscale(30%) brightness(0.8); /* Làm ảnh hơi tối và bớt màu để tạo vẻ huyền bí */
    border: 1px solid var(--border);
    position: relative;
}

section img:hover {
    filter: grayscale(0%) brightness(1.1); /* Ảnh sáng rõ và có màu lại khi hover */
    transform: scale(1.02) translateY(-5px); /* Phóng to nhẹ và nhích lên trên */
    border-color: var(--primary); /* Đổi màu viền sang xanh lá */
    box-shadow: 0 20px 40px rgba(0, 255, 170, 0.2), 
                0 0 20px rgba(0, 255, 170, 0.1); /* Đổ bóng phát sáng màu xanh */
    z-index: 10;
}