/* ============================================================
   Connect Vietnam – Main Stylesheet
   Colors: Primary #047283 | Teal #098ba0 | Accent #61c091
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&display=swap&subset=vietnamese');

/* Fallback nếu Google Fonts không load được */


:root {
    --primary:        #047283;
    --primary-dark:   #035e6c;
    --primary-light:  #098ba0;
    --accent:         #61c091;
    --accent2:        #00c4a0;
    --stats-bg:       #064e5a;
    --dark:           #1C2B3A;
    --text:           #374151;
    --text-light:     #6B7280;
    --border:         #E5E7EB;
    --bg-light:       #F8FFFE;
    --white:          #FFFFFF;
    --radius:         12px;
    --radius-lg:      20px;
    --shadow:         0 4px 20px rgba(4,114,131,.1);
    --shadow-lg:      0 8px 40px rgba(4,114,131,.18);
    --transition:     .3s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: 'Be Vietnam Pro', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ── Typography ── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; color: var(--dark); }
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
p  { font-size: .95rem; }

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

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

/* ── Layout ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

section { padding: 5rem 0; }

.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header h2 { margin-bottom: .75rem; }
.section-header p { color: var(--text-light); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ── Buttons ── */
.btn {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .8rem 1.8rem;
    border-radius: 50px; font-weight: 600; font-size: .9rem;
    cursor: pointer; border: 2px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--accent2); color: var(--white);
    border-color: var(--accent2);
}
.btn-primary:hover { background: var(--primary); border-color: var(--primary); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,196,160,.35); }

.btn-outline {
    background: transparent; color: var(--white);
    border-color: rgba(255,255,255,.7);
}
.btn-outline:hover { background: rgba(255,255,255,.15); border-color: var(--white); color: var(--white); }

.btn-primary-outline {
    background: transparent; color: var(--primary);
    border-color: var(--primary);
}
.btn-primary-outline:hover { background: var(--primary); color: var(--white); }

/* ── Navbar ── */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 1rem 0;
    transition: all var(--transition);
}
.navbar.scrolled {
    background: rgba(4,78,90,.97);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0,0,0,.2);
    padding: .7rem 0;
}
.navbar .container {
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    display: flex; align-items: center; gap: .75rem;
    color: var(--white); font-weight: 700; font-size: 1.05rem;
}
.nav-logo img { height: 40px; filter: brightness(10); }
.nav-links {
    display: flex; align-items: center; gap: 2rem;
    list-style: none;
}
.nav-links a {
    color: rgba(255,255,255,.9); font-size: .875rem; font-weight: 500;
    transition: color var(--transition);
}
.nav-links a:hover { color: var(--accent); }
.nav-cta { display: flex; gap: .75rem; }
.hamburger {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: .25rem;
}
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: all var(--transition); }

/* ── Hero ── */
.hero {
    position: relative; min-height: 100vh;
    display: flex; align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    display: grid; grid-template-columns: 1fr 1fr;
}
.hero-bg img {
    width: 100%; height: 100%; object-fit: cover;
}
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(4,78,90,.82) 0%, rgba(4,114,131,.72) 60%, rgba(0,0,0,.5) 100%);
}
.hero-content {
    position: relative; z-index: 2;
    width: 100%; padding: 8rem 0 4rem;
}
.hero-content .container { text-align: center; }
.hero-logo {
    display: flex; flex-direction: column; align-items: center; gap: .5rem;
    margin-bottom: 2rem;
}
.hero-logo img {
    height: 160px;
    filter: brightness(0) invert(1);
}
.hero-logo-text {
    color: var(--white); font-size: .75rem; font-weight: 600;
    letter-spacing: .2em; opacity: .9;
}
.hero h1 {
    color: var(--white); font-size: clamp(1.6rem, 3.5vw, 2.6rem);
    font-weight: 800; letter-spacing: .05em;
    margin-bottom: 1rem; text-transform: uppercase;
}
.hero-subtitle {
    color: rgba(255,255,255,.92); font-size: 1rem; font-weight: 500;
    margin-bottom: .5rem;
}
.hero-desc {
    color: rgba(255,255,255,.8); font-size: .9rem;
    max-width: 600px; margin: 0 auto 2.5rem;
}
.hero-buttons { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* ── Vision Section ── */
.vision { background: var(--white); }
.vision-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 2rem;
}
.vision-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    position: relative; overflow: hidden;
    transition: box-shadow var(--transition);
}
.vision-card:hover { box-shadow: var(--shadow-lg); }
.vision-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--primary) 100%);
}
.vision-icon {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, rgba(97,192,145,.15), rgba(9,139,160,.15));
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--primary);
}
.vision-card h3 { margin-bottom: 1.25rem; color: var(--dark); }
.vision-list { list-style: none; }
.vision-list li {
    display: flex; gap: .75rem;
    margin-bottom: .9rem; font-size: .875rem; color: var(--text);
    align-items: flex-start;
}
.vision-list li::before {
    content: '✓';
    flex-shrink: 0; width: 20px; height: 20px;
    background: rgba(97,192,145,.2); color: var(--accent);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: .7rem; font-weight: 700; margin-top: .15rem;
    line-height: 1;
}

/* ── Stats Section ── */
.stats {
    background: var(--stats-bg);
    padding: 5rem 0;
}
.stats .section-header h2 { color: var(--white); }
.stats .section-header p { color: rgba(255,255,255,.7); }

.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 2rem; text-align: center;
}
.stat-item { padding: 1.5rem 1rem; }
.stat-icon {
    width: 56px; height: 56px; margin: 0 auto 1rem;
    background: rgba(97,192,145,.2);
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    color: var(--accent);
}
.stat-number {
    font-size: clamp(2rem, 4vw, 3rem); font-weight: 800;
    color: var(--white); line-height: 1; margin-bottom: .5rem;
}
.stat-label { color: rgba(255,255,255,.75); font-size: .875rem; }

/* ── Activities Section ── */
.activities { background: var(--bg-light); }
.activities-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}
.activity-card {
    background: var(--white); border-radius: var(--radius-lg);
    padding: 2rem 1.75rem; text-align: left;
    border: 1px solid var(--border);
    transition: all var(--transition);
    cursor: default;
}
.activity-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.activity-icon {
    width: 52px; height: 52px; margin-bottom: 1.25rem;
    background: linear-gradient(135deg, rgba(97,192,145,.15), rgba(9,139,160,.1));
    border-radius: 14px; display: flex; align-items: center; justify-content: center;
    color: var(--primary);
}
.activity-card h3 { font-size: 1.05rem; margin-bottom: .75rem; color: var(--dark); }
.activity-card p { font-size: .85rem; color: var(--text-light); line-height: 1.6; }

/* ── Ecosystem Section ── */
.ecosystem { background: var(--white); }

.eco-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.eco-card {
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
    transition: all var(--transition);
    box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.eco-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 48px rgba(0,0,0,.12);
    border-color: transparent;
}

/* Illustration header */
.eco-card-header {
    position: relative; height: 180px;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.eco-card-glow {
    position: absolute; inset: -30%;
    border-radius: 50%;
    filter: blur(40px);
}
.eco-card-icon {
    position: relative; z-index: 1;
    width: 72px; height: 72px;
    color: rgba(255,255,255,.9);
    filter: drop-shadow(0 4px 16px rgba(0,0,0,.2));
}
.eco-card-live {
    position: absolute; top: 1rem; right: 1rem;
    background: rgba(255,255,255,.2); backdrop-filter: blur(8px);
    color: #fff; font-size: .72rem; font-weight: 600;
    padding: .3rem .75rem; border-radius: 50px;
    border: 1px solid rgba(255,255,255,.3);
}
.eco-card-soon {
    position: absolute; top: 1rem; right: 1rem;
    background: rgba(0,0,0,.2); backdrop-filter: blur(8px);
    color: rgba(255,255,255,.8); font-size: .72rem; font-weight: 600;
    padding: .3rem .75rem; border-radius: 50px;
    border: 1px solid rgba(255,255,255,.15);
}

/* Card body */
.eco-card-body { padding: 1.75rem; }
.eco-card-body h3 { font-size: 1.1rem; color: var(--dark); margin-bottom: .65rem; }
.eco-card-body p  { font-size: .875rem; color: var(--text-light); line-height: 1.65; margin-bottom: 1.5rem; }

.eco-link-btn {
    display: inline-flex; align-items: center; gap: .4rem;
    padding: .6rem 1.4rem; border-radius: 50px;
    color: #fff; font-size: .85rem; font-weight: 600;
    text-decoration: none; transition: all var(--transition);
    box-shadow: 0 4px 14px rgba(0,0,0,.15);
}
.eco-link-btn:hover { opacity: .88; transform: translateY(-1px); color: #fff; }

.eco-badge-soon {
    display: inline-block; padding: .5rem 1.2rem;
    background: var(--bg-light); color: var(--text-light);
    border-radius: 50px; font-size: .82rem; font-weight: 600;
    border: 1px solid var(--border);
}

/* ── Team Section ── */
.team { background: var(--bg-light); }
.team-tabs {
    display: flex; justify-content: center; gap: 1rem;
    margin-bottom: 3rem;
}
.team-tab {
    padding: .65rem 1.8rem; border-radius: 50px; font-weight: 600;
    font-size: .875rem; cursor: pointer; border: 2px solid var(--primary);
    transition: all var(--transition);
}
.team-tab.active { background: var(--primary); color: var(--white); }
.team-tab:not(.active) { background: transparent; color: var(--primary); }
.team-tab:hover:not(.active) { background: var(--primary); color: var(--white); }

.team-grid {
    display: grid; grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}
.team-card { text-align: center; }
.team-avatar {
    width: 120px; height: 120px; border-radius: 50%;
    margin: 0 auto 1rem; overflow: hidden;
    border: 4px solid rgba(97,192,145,.4);
    transition: border-color var(--transition);
}
.team-card:hover .team-avatar { border-color: var(--primary); }
.team-avatar img { width: 100%; height: 100%; object-fit: cover; }
.team-card h3 { font-size: .9rem; color: var(--dark); margin-bottom: .3rem; }
.team-card .role { font-size: .78rem; color: var(--text-light); margin-bottom: .75rem; line-height: 1.4; }
.team-card a { font-size: .8rem; color: var(--primary); font-weight: 600; display: inline-flex; align-items: center; gap: .25rem; }
.team-card a:hover { color: var(--primary-dark); }

.team-pane { display: none; }
.team-pane.active { display: block; }

/* ── Footer ── */
.footer {
    background: var(--stats-bg);
    padding: 4rem 0 2rem;
    color: rgba(255,255,255,.8);
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem; margin-bottom: 3rem;
}
.footer-brand {}
.footer-brand .brand-logo {
    display: flex; align-items: center; gap: .75rem;
    margin-bottom: 1rem; color: var(--white); font-weight: 700;
}
.footer-brand .brand-logo img { height: 36px; filter: brightness(0) invert(1); }
.footer-brand p { font-size: .875rem; line-height: 1.7; margin-bottom: .5rem; }
.footer-brand a { color: var(--accent); font-size: .85rem; }
.footer-brand a:hover { color: var(--white); }
.footer-col h4 { color: var(--white); font-size: .95rem; margin-bottom: 1.25rem; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: .6rem; }
.footer-col a { color: rgba(255,255,255,.7); font-size: .85rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--accent); }
.social-links { display: flex; gap: .75rem; margin-top: 1.5rem; }
.social-link {
    width: 38px; height: 38px; border-radius: 50%;
    background: rgba(255,255,255,.1); color: var(--white);
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; transition: all var(--transition);
}
.social-link:hover { background: var(--accent2); color: var(--white); transform: translateY(-3px); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding-top: 1.5rem; text-align: center;
    font-size: .8rem; color: rgba(255,255,255,.5);
}

/* ── Utilities ── */
.text-primary { color: var(--primary); }
.text-accent  { color: var(--accent); }
.text-center  { text-align: center; }

/* ── Scroll animations ── */
.fade-up {
    opacity: 0; transform: translateY(30px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive ── */
@media (max-width: 1024px) {
    .activities-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid      { grid-template-columns: repeat(2, 1fr); }
    .team-grid       { grid-template-columns: repeat(3, 1fr); }
    .footer-grid     { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links, .nav-cta { display: none; }
    .hamburger { display: flex; }
    .nav-links.open {
        display: flex; flex-direction: column;
        position: fixed; top: 60px; left: 0; right: 0; bottom: 0;
        background: var(--stats-bg); padding: 2rem;
        gap: 1.5rem; z-index: 999;
    }
    .nav-links.open .nav-cta-mobile { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }

    .vision-grid { grid-template-columns: 1fr; }
    .eco-grid    { grid-template-columns: 1fr; }
    .team-grid   { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .hero-bg     { grid-template-columns: 1fr; }
    .hero-bg img:last-child { display: none; }
}

@media (max-width: 480px) {
    .activities-grid { grid-template-columns: 1fr; }
    .stats-grid      { grid-template-columns: 1fr; }
    .team-grid       { grid-template-columns: repeat(2, 1fr); }
    .hero-buttons    { flex-direction: column; align-items: center; }
}