/* ===== CSS Variables ===== */
:root {
    --primary: #0ea5e9;
    --accent: #22d3ee;
    --secondary: #1e293b;
    --bg: #0f172a;
    --bg-deep: #0a0e17;
    --surface: #1e293b;
    --surface-alt: #1a2332;
    --text: #e2e8f0;
    --heading: #f8fafc;
    --gray: #94a3b8;
    --white: #ffffff;
    --border: #334155;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glow: 0 0 24px rgba(34, 211, 238, 0.35);
    --gradient-primary: linear-gradient(135deg, #0ea5e9, #22d3ee);
    --gradient-accent: linear-gradient(135deg, #22d3ee, #0ea5e9);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0ea5e9 100%);
    --radius: 8px;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--heading);
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color 0.3s ease;
}

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

ul {
    list-style: none;
}

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

/* ===== Animation ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Navbar ===== */
.navbar {
    background-color: var(--bg-deep);
    color: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--secondary);
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
}

.navbar .logo i {
    margin-right: 0.5rem;
    color: var(--accent);
}

.navbar .nav-links {
    display: flex;
    gap: 1.5rem;
}

.navbar .nav-links a {
    color: var(--white);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
    background-color: var(--secondary);
    color: var(--accent);
}

.navbar .hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--white);
}

/* ===== Hero Section ===== */
.hero {
    background: url('images/hero-background.jpg') center/cover;
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
    height: 70vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 2rem;
    animation: fadeIn 0.8s ease;
        /* ✅ เพิ่มบรรทัดนี้เข้าไป! */
    box-shadow: inset 0 0 0 2000px rgba(10, 14, 23, 0.5);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    color: var(--text);
}

.hero .btn {
    background-color: var(--primary);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.hero .btn:hover {
    background-color: var(--accent);
    box-shadow: var(--glow);
}

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

.hero .btn-outline:hover {
    background-color: var(--white);
    color: var(--bg-deep);
}

/* ===== Cards ===== */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 3rem 2rem;
}

.card {
    background:
        linear-gradient(var(--surface), var(--surface)) padding-box,
        linear-gradient(135deg, rgba(14, 165, 233, 0.35), rgba(34, 211, 238, 0.15)) border-box;
    border: 1px solid transparent;
    color: var(--text);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeIn 0.8s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow);
}

.card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.card h3 {
    margin-bottom: 0.5rem;
    color: var(--heading);
}

.card p {
    color: var(--gray);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    background-color: var(--primary);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.btn:hover {
    background-color: var(--accent);
    box-shadow: var(--glow);
    transform: translateY(-2px);
}

.btn-gradient {
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.4);
}

.btn-gradient:hover {
    background: var(--gradient-accent);
    box-shadow: var(--glow);
}

.btn-accent {
    background: var(--gradient-accent);
    color: var(--white);
    border: none;
    box-shadow: 0 4px 14px rgba(34, 211, 238, 0.4);
}

.btn-accent:hover {
    background: var(--gradient-primary);
    box-shadow: var(--glow);
}

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

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

/* ===== Footer ===== */
.footer {
    background-color: var(--bg-deep);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: auto;
    border-top: 1px solid var(--secondary);
}

.footer .social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer .social-links a {
    color: var(--white);
    font-size: 1.5rem;
    transition: color 0.3s ease;
}

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

.footer p {
    font-size: 0.9rem;
    color: var(--gray);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background-color: var(--bg-deep);
        position: absolute;
        top: 60px;
        left: 0;
        padding: 1rem;
    }

    .navbar .nav-links.show {
        display: flex;
    }

    .navbar .hamburger {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .cards-container {
        grid-template-columns: 1fr;
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.75rem 1rem;
    }

    .navbar .logo {
        font-size: 1.2rem;
    }

    .hero {
        padding: 3rem 1rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }
}

/* ===== Additional Sections ===== */
.section {
    padding: 3rem 2rem;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--heading);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.news-item i {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.news-item h3 {
    margin-bottom: 0.5rem;
}

.news-item p {
    margin-bottom: 1rem;
    color: var(--gray);
}

.coming-soon {
    background-color: var(--surface);
}

.badge {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

.testimonial {
    text-align: left;
}

.testimonial i {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.testimonial h4 {
    margin-top: 1rem;
    color: var(--heading);
}

.testimonial span {
    color: var(--gray);
    font-size: 0.9rem;
}

.partners {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    padding: 1rem 0;
}

.partner-logo {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: bold;
    color: var(--heading);
    box-shadow: var(--shadow);
}

.partner-logo i {
    color: var(--accent);
    font-size: 1.5rem;
}

/* ===== Utilities ===== */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}