/* ===== VARIABLES & RESET ===== */
:root {
    --bg-primary: #1f3b2c;        /* xanh lá đậm vừa */
    --bg-secondary: #2c4a3a;
    --card-bg: rgba(44, 74, 58, 0.7);
    --text-light: #f0f7e8;
    --text-soft: #d0e0cf;
    --accent: #f5b342;              /* vàng mật ong */
    --accent-light: #f8d49a;
    --border: #3d6b4f;
    --shadow: 0 25px 40px -15px #0f1f15;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-light);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    width: 100%;
}

/* ===== HEADER ===== */
.header {
    padding: 24px 0;
    background: rgba(31, 59, 44, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-size: 2.4rem;
    font-weight: 800;
    background: linear-gradient(145deg, #d4ed9a, #f5b342);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    width: fit-content;
    letter-spacing: -0.02em;
}

/* ===== HERO ===== */
.hero {
    padding: 60px 0 40px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    background: linear-gradient(145deg, #e5ffc7, #ffd966);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}

.description {
    background: var(--card-bg);
    backdrop-filter: blur(4px);
    border-radius: 32px;
    padding: 28px 32px;
    margin-bottom: 32px;
    font-size: 1.1rem;
    color: var(--text-soft);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.inline-link {
    color: var(--accent-light);
    font-weight: 700;
    text-decoration: none;
    border-bottom: 2px solid var(--accent);
    transition: 0.2s;
}

.inline-link:hover {
    color: #ffe484;
    border-bottom-color: #ffe484;
}

.hero-actions {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.btn {
    padding: 16px 40px;
    border-radius: 60px;
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: 0.3s;
    border: none;
    cursor: pointer;
    background: linear-gradient(145deg, #3b6e4b, #2c5e3a);
    color: white;
    box-shadow: 0 15px 25px -8px #1f3b2c;
    border: 1px solid #5b8c5a;
}

.btn:hover {
    transform: translateY(-4px);
    background: linear-gradient(145deg, #4b815b, #3b6e4b);
    box-shadow: 0 25px 35px -8px #0f2a18;
}

.url-chip {
    background: #2c4a3a;
    padding: 12px 30px;
    border-radius: 60px;
    border: 1px dashed var(--accent);
    font-size: 1rem;
    backdrop-filter: blur(4px);
}

.url-chip a {
    color: var(--accent-light);
    text-decoration: none;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 2px;
    font-weight: 500;
}

.url-chip a:hover {
    color: #ffd966;
    border-bottom-color: #ffd966;
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.shape {
    position: absolute;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle at 30% 30%, #4f7b5f, #1f3b2c);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    animation: drift 10s infinite alternate ease-in-out;
    opacity: 0.5;
    filter: blur(10px);
}

@keyframes drift {
    0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; transform: translate(0, 0) rotate(0deg); }
    100% { border-radius: 50% 50% 50% 50% / 60% 40% 60% 40%; transform: translate(25px, -20px) rotate(8deg); }
}

.leaf-icon {
    position: relative;
    font-size: 8rem;
    color: #e5ffc7;
    filter: drop-shadow(0 10px 15px #1f3b2c);
    z-index: 2;
}

/* ===== CARDS ===== */
.cards-section {
    padding: 80px 0;
}

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

.card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border-radius: 40px;
    padding: 40px 28px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-12px);
    background: #2f5240;
    border-color: var(--accent);
    box-shadow: 0 30px 50px -15px #0f2f1b;
}

.card-icon {
    background: #3d6b4f;
    width: 70px;
    height: 70px;
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
    color: var(--accent-light);
    font-size: 2.2rem;
    box-shadow: 0 10px 18px -6px #1f3b2c;
}

.card h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(145deg, #d0f0c0, #ffd966);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card p {
    color: var(--text-soft);
    font-size: 1rem;
    flex: 1;
}

/* ===== FOOTER ===== */
.footer {
    background: #153020;
    border-top: 2px solid #3d6b4f;
    padding: 32px 0 24px;
    text-align: center;
    margin-top: 60px;
}

.footer-name {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(145deg, #d4ed9a, #f5b342);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.footer-copyright {
    color: #b0cfb0;
    font-size: 0.95rem;
    border-top: 1px dashed #3d6b4f;
    padding-top: 20px;
    max-width: 750px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-actions {
        justify-content: center;
    }
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
    .hero-text h1 {
        font-size: 2.5rem;
    }
    .shape {
        width: 220px;
        height: 220px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .btn, .url-chip {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}