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

body {
    margin: 0;
    color: #ffffff;
    font-family: Arial, sans-serif;
    background:
        radial-gradient(circle at top center, rgba(0, 200, 255, 0.12), transparent 28%),
        radial-gradient(circle at 20% 30%, rgba(0, 132, 255, 0.10), transparent 30%),
        radial-gradient(circle at 80% 20%, rgba(0, 255, 200, 0.08), transparent 25%),
        linear-gradient(180deg, #030814 0%, #050b18 35%, #07101f 70%, #04070f 100%);
    background-attachment: fixed;
}
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        linear-gradient(rgba(0, 180, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 180, 255, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: linear-gradient(to bottom, rgba(255,255,255,0.35), rgba(255,255,255,0.08));
}
/* VARIABLES */
:root {
    --tech-blue: #74e2fb;
    --tech-blue-light: #69e8ff;
    --tech-blue-deep: #95caff;
    --bg-dark: #050816;
    --bg-card: #0d1322;
    --text-gray: #9fb3c8;
}

/* HEADER */
/* HEADER */
.header{
    background:#000;
    padding:15px 0;
}

.nav{
    max-width:1100px;
    margin:auto;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:0 20px;
}

.nav a{
    color:white;
    text-decoration:none;
    font-size:14px;
    white-space:nowrap;   /* không cho xuống dòng */
    transition:0.2s;
}

.nav a:hover{
    color:#ff6a00;
}

/* HERO */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;

    max-width: 1100px;   /* 🔥 thêm */
    margin: 0 auto;      /* 🔥 thêm */

    padding: 80px 20px;  /* 🔥 đồng bộ */
}

.hero-content {
    max-width: 480px;
}

.hero h1 {
    font-size: 32px;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 20px;

    background: linear-gradient(90deg, #ffffff, #bbbbbb);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 16px;
    color: #9a9a9a;
    margin-bottom: 30px;
    max-width: 420px;
}
.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.hero-image img {
    width: 400px;
    padding: 10px;
    border-radius: 20px;
}

/* BUTTON */
.btn {
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
    white-space: nowrap;

    display: inline-flex; /* 🔥 quan trọng */
    align-items: center;
    justify-content: center;

    text-align: center;
    align-items: center;
    justify-content: center;
    cursor: pointer
}
.btn.primary,
.btn.secondary {
    background: rgba(7, 14, 24, 0.72);
    color: #ecfdff;
    border: 1.5px solid rgba(0, 217, 255, 0.35);
    box-shadow: 0 0 0 rgba(0,0,0,0);
    text-decoration: none;
}

.btn.primary:hover,
.btn.secondary:hover {
    border-color: rgba(99, 233, 255, 0.95);
    box-shadow: 0 0 22px rgba(0, 217, 255, 0.22);
}

.divider {
    width: 420px;
    height: 4px;
    margin: 30px auto;
    background: linear-gradient(
        to right,
        transparent,
        rgba(0, 217, 255, 0.95),
        transparent
    );
    box-shadow: 0 0 18px rgba(0, 217, 255, 0.18);
}
/* INTRO */
.intro {
    padding: 5px 10px;
    text-align: center;
}

.intro h2 {
    margin-bottom: 40px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto 36px;
}

.feature-item {
    min-height: 118px;
    padding: 24px 20px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;

    color: #eefbff;
    font-size: 18px;
    line-height: 1.5;

    background:
        linear-gradient(145deg, rgba(11, 20, 35, 0.88), rgba(8, 14, 24, 0.80)),
        radial-gradient(circle at top left, rgba(0, 229, 255, 0.10), transparent 40%);
    border: 1px solid rgba(84, 210, 255, 0.22);
    box-shadow:
        0 10px 30px rgba(0, 20, 40, 0.35),
        inset 0 1px 0 rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
}

.feature-item:hover {
    transform: translateY(-6px);
    border-color: rgba(86, 214, 255, 0.55);
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.08),
        0 16px 36px rgba(0, 20, 40, 0.55),
        0 0 28px rgba(0, 229, 255, 0.18);
}

/* AUDIENCE */
.audience {
    padding: 80px 60px;
    text-align: center;
}

.audience-list {
    margin-top: 30px;
    display: grid;
    gap: 15px;
}

.audience-item {
    background: var(--bg-card);
    padding: 15px;
    border-radius: 10px;
}

/* VERSIONS */
.versions {
    padding: 5px 10px;
    text-align: center;
}

.version-list {
    display: flex;
    gap: 20px;
    margin-top: 40px;
    flex-wrap: wrap;
    justify-content: center;
}

.version-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 15px;
    width: 280px;
    transition: 0.3s;
    position: relative;
}

.version-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(123, 30, 43, 0.5);
}

.version-card h3 {
    margin-bottom: 15px;
}

.version-card ul {
    list-style: none;
    margin-bottom: 15px;
}

.version-card ul li {
    margin-bottom: 8px;
    color: var(--text-gray);
}

.tagline {
    font-style: italic;
    color: var(--wine-red-light);
}

/* HIGHLIGHT (PLUS) */
.version-card.highlight {
    border: 2px solid var(--wine-red);
}

.badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--wine-red);
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 8px;
}

.info-section {
    padding: 5px 10px;
    display: flex;
    justify-content: center;
}

.experience-container {
    max-width: 700px;
    width: 100%;
    padding: 40px 40px;
    border-radius: 20px;
    background:
    linear-gradient(
        to bottom,
        rgba(252, 14, 46, 0.16) 0%,
        rgba(255, 12, 44, 0.08) 22%,
        rgba(255, 255, 255, 0.02) 55%,
        rgba(255, 255, 255, 0.01) 100%
    );
    border: 1px solid rgba(123, 30, 43, 0.25);
    box-shadow: 0 0 40px rgba(123, 30, 43, 0.1);
    backdrop-filter: blur(12px);
    text-align: center;
    position: relative;
}

.experience-container h2 {
    margin-bottom: 15px;
    background: linear-gradient(90deg, #ffffff, #cccccc);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}
.experience-container p {
    color: #aaaaaa;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 12px;
}

.experience-container p:last-child {
    margin-bottom: 0;
}
/* CTA */
.cta {
    position: relative;
    padding: 80px 60px;
    text-align: center;
    overflow: hidden;
    background:
        radial-gradient(circle at 50% 20%, rgba(0, 217, 255, 0.10), transparent 30%),
        radial-gradient(circle at 20% 80%, rgba(0, 132, 255, 0.08), transparent 28%),
        linear-gradient(180deg, #060b16 0%, #08101d 45%, #050914 100%);
    border-top: 1px solid rgba(0, 217, 255, 0.10);
}
.cta::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(rgba(0, 180, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 180, 255, 0.035) 1px, transparent 1px);
    background-size: 36px 36px;
    opacity: 0.45;
}

.cta::after {
    content: "";
    position: absolute;
    width: 420px;
    height: 420px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    background: radial-gradient(circle, rgba(0, 217, 255, 0.10), transparent 65%);
    filter: blur(12px);
}

.cta > * {
    position: relative;
    z-index: 1;
}
.cta h2 {
    margin-bottom: 40px;
    color: #ffffff;
    text-shadow: 0 0 18px rgba(0, 217, 255, 0.08);
}

/* FOOTER */
.footer {
    text-align: center;
    padding: 20px;
    border-top: 1px solid #222;
    color: var(--text-gray);
}

/* POPUP */
.order-popup {
    position: fixed;
    inset: 0;
    display: none;
    z-index: 999;
}

.order-popup.active {
    display: block;
}

/* overlay */
.popup-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
}

/* box */
.popup-box {
    position: relative;
    max-width: 400px;
    margin: 80px auto;
    background: linear-gradient(180deg, #7b1e2b, #1a1a1a);
    padding: 25px;
    border-radius: 12px;
    z-index: 2;
    text-align: center;
}

/* close */
.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 22px;
    cursor: pointer;
}

/* version */
.version-group {
    display: flex;
    justify-content: space-between;
    margin: 15px 0;
}

.version-btn {
    flex: 1;
    margin: 0 5px;
    padding: 10px;
    background: #111;
    color: #fff;
    border: 1px solid #444;
    cursor: pointer;
    border-radius: 6px;
    transition: 0.3s;
}

.version-btn.active {
    background: #a83244;
    border-color: #a83244;
}

/* info */
.selected-info {
    margin: 10px 0 20px;
    color: #fff;
    font-weight: 500;
}

/* form */
#orderForm input,
#orderForm textarea {
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
    border: none;
    border-radius: 6px;
}

.submit-btn {
    width: 100%;
    padding: 12px;
    background: #a83244;
    border: none;
    color: white;
    font-weight: bold;
    cursor: pointer;
    border-radius: 6px;
}
/* RESPONSIVE */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-image img {
        width: 100%;
        max-width: 300px;
    }

    .header {
        padding: 20px;
    }

    section {
        padding: 60px 20px;
    }

    .experience {
        padding: 4px 20px 10px;
    }

    .why {
        padding: 5px 20px 24px;
    }
}