/* style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Manrope', sans-serif;
    background-color: #f0f4fa;
    color: #1a2639;
    line-height: 1.5;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 30px;
}

/* New theme: Slate Blue / Silver / White */
:root {
    --primary: #1e2b3c;
    --primary-light: #2c3e5c;
    --accent: #4f7eb3;
    --accent-light: #6c9bd2;
    --silver: #e9edf2;
    --white: #ffffff;
    --text-dark: #1e2b3c;
    --text-soft: #4a5b73;
    --border-light: #d0dae8;
    --gradient-1: linear-gradient(145deg, #eef2f8, #ffffff);
}

/* modern elements */
.card-modern {
    background: var(--white);
    border-radius: 32px;
    box-shadow: 0 15px 35px -10px rgba(30, 43, 60, 0.1);
    border: 1px solid var(--border-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 8px 18px -6px var(--accent);
}

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--accent);
    color: white;
}

/* header */
.header {
    background: var(--white);
    padding: 18px 0;
    border-bottom: 2px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -1px;
}

.logo span {
    color: var(--accent);
    background: #eef2f8;
    padding: 6px 14px;
    border-radius: 60px;
    margin-left: 6px;
}

/* header buttons are now LINKS (Đăng Ký, Đăng Nhập) */
.header-actions {
    display: flex;
    gap: 15px;
}

/* Hero Section */
.hero {
    padding: 70px 0 80px;
    background: var(--gradient-1);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.9fr;
    gap: 50px;
    align-items: center;
}

.hero h1 {
    font-size: 3.6rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--primary);
    margin-bottom: 25px;
}

.hero h1 .highlight {
    color: var(--accent);
    border-bottom: 4px solid var(--accent);
    display: inline-block;
    padding-bottom: 5px;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-soft);
    margin-bottom: 35px;
    max-width: 550px;
}

.stats-modern {
    display: flex;
    gap: 40px;
}

.stat-item {
    text-align: left;
}

.stat-num {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--accent);
}

.hero-media {
    background: var(--primary);
    border-radius: 40px;
    padding: 25px;
    box-shadow: 0 30px 35px -15px var(--primary);
    border: 3px solid var(--accent);
}

.hero-media img {
    width: 100%;
    border-radius: 24px;
    display: block;
}

/* LINK GROUP 1 - placed in hero (SODO exact link) */
.hero-link-block {
    margin-top: 35px;
    display: flex;
    align-items: center;
    gap: 25px;
    flex-wrap: wrap;
}

.link-sodo-hero {
    background: var(--primary);
    color: white;
    padding: 16px 38px;
    border-radius: 60px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.3rem;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    border: 2px solid var(--accent);
    transition: 0.2s;
}

.link-sodo-hero:hover {
    background: var(--accent);
    color: var(--primary);
    transform: scale(1.02);
}

/* LINK GROUP 2 - naked URL in stats section */
.naked-link-area {
    margin: 30px 0;
    background: var(--white);
    border-radius: 60px;
    padding: 20px 30px;
    display: inline-flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 10px 20px -8px #b0c4de;
}

.naked-url-link {
    font-family: 'Courier New', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    border-bottom: 2px dashed var(--accent);
    padding-bottom: 3px;
}

.naked-url-link:hover {
    color: var(--accent);
    border-bottom-color: var(--primary);
}

/* LINK GROUP 3 - general anchor in features */
.general-link-feature {
    display: inline-block;
    background: var(--accent-light);
    color: white;
    padding: 14px 32px;
    border-radius: 60px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 20px;
    border: 1px solid var(--primary);
}

.general-link-feature:hover {
    background: var(--primary);
}

/* rest of sections (no links) */
.features-section {
    padding: 60px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 40px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    border-radius: 32px;
    padding: 35px;
    box-shadow: 0 15px 30px -10px rgba(0,0,0,0.05);
    border: 1px solid var(--border-light);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: #eef2f8;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--accent);
    margin-bottom: 25px;
}

/* game strip */
.game-strip {
    background: var(--white);
    border-radius: 70px;
    padding: 40px;
    margin: 40px 0;
}

.game-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

.game-tag {
    background: #eef2f8;
    padding: 14px 28px;
    border-radius: 60px;
    font-weight: 600;
    color: var(--primary);
}

/* 2FA section */
.security-show {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 60px 0;
}

.security-card {
    background: var(--primary);
    color: white;
    border-radius: 40px;
    padding: 40px;
}

.security-card.light {
    background: var(--white);
    color: var(--primary);
    border: 1px solid var(--border-light);
}

/* app */
.app-download {
    background: linear-gradient(145deg, var(--primary), #152433);
    border-radius: 60px;
    padding: 50px;
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 60px 0;
}

.qr-box {
    width: 140px;
    height: 140px;
    background: var(--white);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--primary);
}

/* footer */
.footer {
    background: var(--primary);
    color: #cbd5e1;
    padding: 60px 0 30px;
    margin-top: 80px;
    border-radius: 60px 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer a {
    color: #cbd5e1;
    text-decoration: none;
}

.footer a:hover {
    color: var(--accent-light);
}

.footer-logo {
    font-size: 2.2rem;
    font-weight: 800;
    color: white;
    margin-bottom: 20px;
}

.copyright {
    border-top: 1px solid #334155;
    padding-top: 30px;
    text-align: center;
}

@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .security-show { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}