:root {
    --bg: #c9d1d5;
    --accent: #0f4c81;
    --muted: #6b7280;
    --card: #ffffff;
    --soft: #f3f7fb;
    --radius: 12px;
    --max-width: 1100px;
}

/* Reset */
* {
    box-sizing: border-box
}

body {
    padding-top: 50px;
    margin: 0;
    font-family: Inter, sans-serif;
    background: var(--soft);
    color: #0c243c;
    line-height: 1.45;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
    height: auto;
}

.container {
    max-width: var(--max-width);
    margin: auto;
    padding: 28px;
    position: static;
}

/* NAVBAR */
header.nav {
    background: #0f243a;
    position: fixed;
    top: 0;
    box-shadow: 0 2px 8px rgba(10, 25, 47, 0.06);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    /* để header nổi trên nội dung */
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand .logo {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    background: #0c243c;
    font-weight: 700;
    font-family: "Playfair Display";
}

.brand h1 {
    font-size: 20px;
    margin: 0;
    font-weight: 600;
    color: aliceblue;
    font-family: andele Mono, monospace;
}

nav.main-menu {
    display: flex;
    gap: 20px;
}

nav.main-menu a {
    font-size: 15px;
    color: aliceblue;
    padding: 8px 4px;
    border-radius: 10px;
    border: 2px solid #0f243a;
}

nav.main-menu a:hover {
    color: #7E8C9C;
}

.btn-cta {
    background: var(--accent);
    color: #55c2c3;
    padding: 9px 14px;
    border-radius: 10px;
    font-weight: 600;
    border: #2a9df4 2px solid;
}

/* HERO */
.hero {
    padding: 40px 0 20px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 36px;
    align-items: start;
}

.hero h2 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 44px;
    margin: 6px 0 12px;
    justify-content: center;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero p.lead {
    color: var(--muted);
    margin: 0 0 18px;
}

.hero-card {
    background: var(--card);
    border-radius: 14px;
    padding: 6px;
    overflow: hidden;
    align-self: center;
}

.hero-img {
     
    object-fit: cover;
    width: 100%;
    border-radius: 10px;
    box-shadow: #5f5f5f 0px 4px 8px -2px;
}

.mini-cta {
    display: flex;
    margin-top: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid #ddd;
    font-weight: 600;
    color: var(--accent);
    justify-content: center;
    align-items: center;
}

/* SECTION CARDS */
.section {
    padding: 44px 0;
}

.section .section-title {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 20px;
    color: var(--accent);
}

.card-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.card {
    background: var(--card);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.336);
}

.card .thumb {
    height: 140px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 12px;
    background: #f2f4f6;
}

.card h4 {
    margin: 0;
    font-size: 16px;
}

.card p {
    color: var(--muted);
    font-size: 14px;
    margin: 8px 0 0;
}

/* Feature */
.feature {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 28px;
    align-items: center;
}

.feature .feature-img {
    height: 260px;
    border-radius: 12px;
    overflow: hidden;
    background: #eee;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.336);

}

.btn-row {
    display: flex;
    gap: 12px;
    margin-top: 14px;
}

.btn {
    background: #0c243c;
    color: #fff;
    padding: 10px 14px;
    border-radius: 8px;
    font-weight: 600;
}

.btn.secondary {
    background: #fff;
    color: #0b1220;
    border: 1px solid #ddd;
}

/* Testimonials */
.testi-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.testimonial {
    background: #fff;
    padding: 12px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.39);
    font-size: 14px;
}

.testimonial p {
    margin: 0;
    color: var(--muted);
}

.testimonial .meta {
    margin-top: 10px;
    font-size: 13px;
    color: var(--muted);
    font-weight: 600;
}

/* Final CTA */
.final-cta {
    background: linear-gradient(90deg, #0f4c81, #2a9df4);
    color: white;
    border-radius: 12px;
    margin: 40px auto;
    display: flex;
    align-items: center;
    flex-direction: column;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.39);
    position: static;
}
.final-cta h3 {
    font-size: 28px;
    margin: 0 0 12px;
    text-align: center;
}
.final-cta p {
    font-size: 16px;
    margin: 0 0 20px;
    text-align: center;
    color: #b1b1b1;
}

/* Footer */
footer {
    padding: 20px;
    color: var(--muted);
    font-size: 14px;
    background-color: #0c243c;
    padding: 20px;
    flex-direction: row;
    text-align: center;
    color: aliceblue;
}

/* MODAL */
.modal {
    display: none;
    /* mặc định ẩn */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.3s ease;
}

.modal-content h3 {
    margin-top: 0;
    color: var(--accent);
}

.modal-content label {
    display: block;
    margin: 10px 0 4px;
    font-size: 14px;
}

.modal-content input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 6px;
    margin-bottom: 10px;
}

.modal-content button {
    width: 100%;
    margin-top: 8px;
}

.close {
    float: right;
    font-size: 20px;
    cursor: pointer;
    color: #888;
}

.close:hover {
    color: #000;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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


/* Responsive */
@media (max-width:980px) {

    .hero-grid,
    .feature {
        grid-template-columns: 1fr;
    }

    .card-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .testi-row {
        grid-template-columns: 1fr;
    }

    nav.main-menu {
        display: none;
    }

    .menu-toggle {
        display: block;
        font-size: 22px;
    }
}

html {
    scroll-behavior: smooth;
}

.main-body {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: auto;
}


/* Responsive design */
@media (max-width: 768px) {
    .social-container {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .social-box {
        flex-direction: column;
    }

    .social-box .icon {
        width: 100%;
        padding: 15px 0;
    }
}

.radio-group {
    margin: 10px 0;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    cursor: pointer;
    font-size: 15px;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: #0f4c81;
    /* màu xanh CLB */
    cursor: pointer;
}

.container-clb {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.box {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    flex-direction: column;
    /* xếp theo cột */
    justify-content: space-between;
    display: flex;
    flex: 1 1 calc(33.333% - 20px); /* 3 cột trên PC */
    min-width: 280px; /* không nhỏ hơn 280px */
}
@media (max-width: 768px) {
    .box {
        flex: 1 1 100%;
    }
}

.box:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.box h2 {
    margin-top: 0;
    font-size: 1.5em;
    color: #0f4c81;
    text-align: center;
}

.box p {
    margin: 12px 0;
    line-height: 1.5;
}

.box img {
    margin-top: auto;
    /* ép hình xuống cuối */
    border-radius: 8px;
    max-width: 100%;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.section-title-clb {
    font-size: 30px;
    font-weight: 700;
    margin: 0 10px;
    color: var(--accent);
    text-align: center;
}

.social-section {
  max-width: 1000px;
  margin: 50px auto;
  padding: 20px;
  text-align: center;
}

.social-section h2 {
  font-size: 1.8em;
  margin-bottom: 15px;
  color: #0f4c81;
}

.social-container {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 25px;
}

.social-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  padding: 15px 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  margin-top: 20px;
}

.social-box:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

.social-box i {
  font-size: 1.8em;
  width: 40px;
  text-align: center;
}

.facebook i { color: #1877f2; }
.tiktok i   { color: #000; }
.instagram i { color: #e4405f; }
.youtube i  { color: #ff0000; }
.linkedin i { color: #0077b5; }

.social-box a {
  text-decoration: none;
  color: #333;
  font-weight: bold;
  font-size: 1.1em;
}