:root {
    --bg-color: #0b0c0e;
    --card-bg: #16171b;
    --card-border: #252830;
    --text-primary: #FFFFFF;
    --text-secondary: #9CA3AF;
    --input-bg: #101114;
    --accent-color: #3B82F6;
    --accent-hover: #2563EB;
    --youtube-color: #FF0000;
}

* {
    box-sizing: border-box;
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

img { max-width: 100%; object-fit: cover; }

/* BACKGROUND HÀO QUANG CHUYỂN ĐỘNG */
.animated-bg {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1; overflow: hidden; background: #0b0c0e; pointer-events: none;
}
.glow-orb {
    position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.22;
    animation: orbFloat 16s infinite alternate ease-in-out;
}
.glow-orb-1 { width: 550px; height: 550px; background: #3B82F6; top: -120px; left: -100px; }
.glow-orb-2 { width: 650px; height: 650px; background: #7E22CE; bottom: -150px; right: -150px; animation-delay: -5s; }
.glow-orb-3 { width: 450px; height: 450px; background: #1D4ED8; top: 35%; left: 35%; animation-delay: -10s; }

@keyframes orbFloat {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(70px, 50px) scale(1.1); }
    100% { transform: translate(-50px, 90px) scale(0.95); }
}

/* NAVBAR */
.web-navbar {
    height: 60px; background-color: rgba(22, 23, 27, 0.85);
    backdrop-filter: blur(12px); border-bottom: 1px solid var(--card-border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 40px; position: sticky; top: 0; z-index: 1000;
}

.brand-logo {
    display: flex; align-items: center; gap: 12px;
    font-weight: 800; font-size: 16px; letter-spacing: 1.5px; cursor: pointer;
}
.brand-logo img {
    width: 32px; height: 32px; border-radius: 50%;
    border: 1px solid var(--accent-color); object-fit: cover;
}

.nav-links { display: flex; gap: 15px; }
.nav-btn {
    background: transparent; border: none; color: var(--text-secondary);
    font-size: 13px; font-weight: 600; padding: 8px 16px; border-radius: 8px;
    cursor: pointer; transition: all 0.2s ease; display: flex; align-items: center; gap: 8px;
}
.nav-btn:hover, .nav-btn.active {
    color: var(--text-primary); background-color: rgba(255, 255, 255, 0.06);
}
.nav-btn.active { border-bottom: 2px solid var(--accent-color); }

.search-bar {
    display: flex; align-items: center; background-color: var(--input-bg);
    border: 1px solid var(--card-border); border-radius: 20px; padding: 6px 14px; width: 240px;
}
.search-bar:focus-within { border-color: var(--accent-color); }
.search-icon { color: var(--text-secondary); font-size: 12px; margin-right: 8px; }
.search-bar input { background: transparent; border: none; outline: none; color: var(--text-primary); font-size: 12px; width: 100%; }

/* PAGE CONTAINER & TRANSITIONS */
.page-container {
    flex: 1; max-width: 1100px; width: 100%; margin: 0 auto; padding: 40px 20px;
}

.page-section {
    display: none; opacity: 0; transform: translateY(20px);
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.page-section.active { display: block; opacity: 1; transform: translateY(0); }

/* HERO BANNER */
.hero-card {
    text-align: center; padding: 70px 30px;
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.15) 0%, transparent 100%);
    border: 1px solid var(--card-border); border-radius: 20px; margin-bottom: 40px;
}
.hero-badge {
    display: inline-block; background-color: rgba(59, 130, 246, 0.2);
    color: var(--accent-color); font-size: 11px; font-weight: 800;
    letter-spacing: 1.5px; padding: 6px 16px; border-radius: 15px; margin-bottom: 18px;
}
.hero-headline { font-size: 38px; font-weight: 800; line-height: 1.25; margin-bottom: 14px; }
.hero-subtext { font-size: 15px; color: var(--text-secondary); max-width: 680px; margin: 0 auto 28px auto; line-height: 1.6; }
.hero-actions { display: flex; justify-content: center; gap: 15px; }

.btn-primary {
    background-color: var(--accent-color); color: #FFF; border: none;
    padding: 12px 28px; border-radius: 10px; font-weight: 700; font-size: 14px;
    cursor: pointer; transition: all 0.2s ease; display: flex; align-items: center; gap: 8px;
}
.btn-primary:hover { background-color: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35); }

.btn-secondary {
    background-color: var(--card-bg); color: var(--text-primary); border: 1px solid var(--card-border);
    padding: 12px 28px; border-radius: 10px; font-weight: 700; font-size: 14px;
    cursor: pointer; transition: all 0.2s ease; display: flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { background-color: var(--card-border); transform: translateY(-2px); }

/* ABOUT US SECTION & CARDS */
.section-container { margin-bottom: 40px; }
.section-title { font-size: 24px; font-weight: 800; margin-bottom: 6px; }
.section-desc { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }

.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.about-card {
    background-color: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 14px; padding: 24px; display: flex; flex-direction: column; gap: 8px;
    transition: all 0.25s ease;
}
.about-card:hover { transform: translateY(-4px); border-color: var(--accent-color); }
.about-icon {
    width: 44px; height: 44px; border-radius: 10px; background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent-color); display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 4px;
}
.about-card-title { font-size: 16px; font-weight: 700; }

/* DÒNG TÊN SUBTITLE ĐINỊ QUỐC TUẤN */
.about-card-subtitle {
    font-size: 13px; color: var(--accent-color); font-weight: 700; letter-spacing: 0.5px;
}

.about-card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* UPCOMING PROJECTS (GAME & PLUGINS) */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.project-card {
    background-color: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 16px; overflow: hidden; display: flex; flex-direction: column; transition: all 0.3s ease;
}
.project-card:hover { transform: translateY(-5px); border-color: var(--accent-color); box-shadow: 0 12px 35px rgba(0,0,0,0.6); }

.project-banner-wrapper { position: relative; width: 100%; height: 170px; background-color: #101114; overflow: hidden; }
.project-banner { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
.project-card:hover .project-banner { transform: scale(1.04); }

.project-banner-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, #1f222a 0%, #101114 100%);
}

.project-badge {
    position: absolute; top: 12px; right: 12px; padding: 4px 10px; border-radius: 12px;
    font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.5px; color: #FFF;
}
.project-badge.game { background-color: #E11D48; }
.project-badge.plugin { background-color: #3B82F6; }

.project-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.project-title { font-size: 18px; font-weight: 800; }
.project-desc { font-size: 12px; color: var(--text-secondary); line-height: 1.5; flex: 1; }

.project-link-btn {
    background-color: var(--accent-color); color: #FFF; text-decoration: none;
    padding: 10px; border-radius: 8px; font-weight: 700; font-size: 12px;
    text-align: center; display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: background-color 0.2s;
}
.project-link-btn:hover { background-color: var(--accent-hover); }
.project-link-btn.secondary { background-color: var(--btn-bg); border: 1px solid var(--card-border); color: var(--text-primary); }
.project-link-btn.secondary:hover { background-color: var(--card-border); }

/* APPS STORE GRID */
.section-header { margin-bottom: 30px; }
.section-header h2 { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.section-header p { color: var(--text-secondary); font-size: 14px; }

.apps-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.app-card {
    background-color: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 16px; padding: 24px; display: flex; flex-direction: column; gap: 14px; transition: all 0.3s ease;
}
.app-card:hover { transform: translateY(-5px); border-color: var(--accent-color); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5); }
.app-card-top { display: flex; align-items: center; gap: 14px; }
.app-card-icon { width: 52px; height: 52px; border-radius: 12px; object-fit: cover; background-color: var(--input-bg); border: 1px solid var(--card-border); }
.app-card-title { font-size: 18px; font-weight: 700; }
.app-card-category { font-size: 11px; color: var(--accent-color); font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.app-card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.5; flex: 1; }
.app-card-btn { background-color: var(--accent-color); color: #FFF; text-align: center; text-decoration: none; padding: 10px; border-radius: 8px; font-weight: 700; font-size: 13px; display: block; }
.app-card-btn:hover { background-color: var(--accent-hover); }
.app-card-btn.disabled { background-color: #333336; color: #777; cursor: not-allowed; pointer-events: none; }

/* MODAL STYLES */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
    background-color: rgba(0, 0, 0, 0.75); backdrop-filter: blur(8px);
    z-index: 9000; display: flex; justify-content: center; align-items: center;
    opacity: 0; visibility: hidden; transition: all 0.3s ease;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-card {
    background-color: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 20px; width: 480px; max-width: 90%; padding: 30px;
    position: relative; box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
    display: flex; flex-direction: column; gap: 20px;
}
.modal-close-btn { position: absolute; top: 20px; right: 20px; background: none; border: none; color: var(--text-secondary); font-size: 24px; cursor: pointer; }
.modal-close-btn:hover { color: #EF4444; }
.modal-title { font-size: 20px; font-weight: 800; display: flex; align-items: center; gap: 10px; }

.contact-info-list { display: flex; flex-direction: column; gap: 14px; background-color: var(--input-bg); border: 1px solid var(--card-border); border-radius: 12px; padding: 16px; }
.contact-item { display: flex; align-items: center; gap: 14px; }
.contact-item .icon { font-size: 18px; color: var(--accent-color); width: 24px; text-align: center; }
.contact-item .label { font-size: 11px; color: var(--text-secondary); font-weight: 600; }
.contact-item .val { font-size: 13px; font-weight: 700; color: var(--text-primary); }
.contact-item .link { font-size: 13px; font-weight: 700; color: var(--accent-color); text-decoration: none; }
.contact-item .link:hover { text-decoration: underline; }

.youtube-cta-btn {
    background-color: var(--youtube-color); color: #FFFFFF; text-decoration: none;
    padding: 14px; border-radius: 10px; font-weight: 800; font-size: 13px;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    transition: all 0.2s ease; box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}
.youtube-cta-btn:hover { background-color: #CC0000; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255, 0, 0, 0.5); }

.web-footer { height: 50px; border-top: 1px solid var(--card-border); display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--text-secondary); margin-top: auto; }