:root {
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
}

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

body {
    font-family: 'Inter', 'Prompt', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Effects */
.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(129, 140, 248, 0.08) 0%, transparent 25%);
    z-index: -1;
    pointer-events: none;
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 500;
    font-family: 'Prompt', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(56, 189, 248, 0.4);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: rgba(56, 189, 248, 0.05);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    /* ไล่จากขาว (ซ้าย) ไปฟ้า (ขวา) */
    background: linear-gradient(to right, rgba(41, 63, 72, 0.05), rgba(56, 189, 248, 0.1));

    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    /* Expand max width slightly for better spacing */
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
}

.logo-icon {
    color: var(--primary);
}

/* Navigation Groups (Desktop) */
.nav-desktop-group {
    display: flex;
    gap: 2rem;
    flex: 1;
    align-items: center;
}

.nav-desktop-group.left {
    padding-left: 2rem;
    justify-content: flex-start;
}

.nav-desktop-group.right {
    padding-right: 2rem;
    justify-content: flex-end;
}

/* Shared Link Styles */
.nav-desktop-group a,
.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-desktop-group a:hover,
.nav-links a:hover {
    color: var(--text-main);
}

.nav-links {
    display: none;
}

.mobile-toggle {
    display: none;
    color: var(--text-main);
    cursor: pointer;
}

/* Hero Section */
.hero-section {
    padding-top: 10rem;
    padding-bottom: 6rem;
    text-align: center;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    max-width: 900px;
    margin: 2rem auto;
    border-radius: 1.5rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.content-article {
    max-width: 800px;
    margin: 4rem auto;
}

.content-article h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.content-article p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.content-article ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-muted);
}

.content-article li {
    margin-bottom: 0.5rem;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(56, 189, 248, 0.1);
    color: var(--primary);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: 50px;
    font-size: 0.75rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

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

/* Features */
.features-section {
    padding: 3rem 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 1rem;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
}

.icon-box {
    width: 50px;
    height: 50px;
    background: rgba(56, 189, 248, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-muted);
}

/* FAQ Section */
.faq-section {
    padding: 6rem 0;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
}

.faq-icon {
    transition: transform 0.3s ease;
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: rgba(0, 0, 0, 0.2);
}

.faq-answer p {
    padding: 1.5rem;
    padding-top: 0;
    color: var(--text-muted);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    /* Approximate max-height needed */
}

/* Footer */
.site-footer {
    padding: 4rem 0 2rem;
    background: rgba(15, 23, 42, 0.4);
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-about h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.footer-about p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 400px;
    margin-bottom: 1.5rem;
}

.footer-links h4 {
    font-size: 1rem;
    margin-bottom: 1.25rem;
    color: var(--text-main);
}

.footer-links ul {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

.social-links {
    display: flex;
    gap: 1rem;
}

.social-icon {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.3s;
}

.social-icon:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive */
/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .nav-desktop-group {
        display: none;
    }

    .nav-links {
        display: block;
        /* Prepare for transform transition */
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(15px);
        padding: 2rem;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transform: translateY(-150%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .mobile-toggle {
        display: block;
    }

    .hero-section {
        padding-top: 8rem;
        padding-bottom: 4rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
        /* Reduced for better mobile fit */
    }

    .hero-btns {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .features-section,
    .faq-section {
        padding: 4rem 0;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
        text-align: center;
    }

    .footer-about p {
        margin: 0 auto 1.5rem;
    }

    .social-links {
        justify-content: center;
    }
}

/* Step Flow Design */
.steps-flow-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 3rem;
    position: relative;
    padding: 2rem 0;
}

.step-item {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-indicator {
    width: 60px;
    height: 60px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    position: relative;
    transition: all 0.3s ease;
}

.step-number {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(56, 189, 248, 0.3);
}

.step-item i {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.step-item h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    color: var(--text-main);
}

.step-item p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.5;
}

/* Connecting Line */
.steps-flow-container::before {
    content: '';
    position: absolute;
    top: 50px;
    /* Center of indicator offset */
    left: 10%;
    right: 10%;
    height: 2px;
    background: rgba(255, 255, 255, 0.05);
    z-index: 0;
}

.step-item:hover .step-indicator {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}

@media (max-width: 768px) {
    .steps-flow-container {
        flex-direction: column;
        gap: 4rem;
    }

    .steps-flow-container::before {
        left: 30px;
        /* Align with indicator */
        top: 0;
        bottom: 0;
        width: 2px;
        height: 100%;
    }

    .step-item {
        display: flex;
        text-align: left;
        align-items: center;
        gap: 1.5rem;
    }

    .step-indicator {
        margin: 0;
        flex-shrink: 0;
    }
}


/* 4ข้อดี */
.features-grid {
    display: grid;
    /* ปรับให้มี 2 คอลัมน์ ขนาดเท่ากัน (1fr 1fr) */
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    /* ระยะห่างระหว่างกล่อง */
    max-width: 800px;
    /* กำหนดความกว้างรวมเพื่อให้กล่องไม่แบนเกินไป */
    margin: 0 auto;
    /* จัดกลุ่มกล่องทั้งหมดให้อยู่กลางหน้าจอ */
}

/* ปรับแต่งเพิ่มเติมสำหรับหน้าจอมือถือ */
@media (max-width: 600px) {
    .features-grid {
        /* พอมือถือจอแคบ ให้เหลือคอลัมน์เดียว */
        grid-template-columns: 1fr;
    }
}

/* 4ข้อดี */

/* Contact Info List */
.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    margin-bottom: 1rem;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(56, 189, 248, 0.05);
    border: 1px solid rgba(56, 189, 248, 0.1);
    border-radius: 12px;
    transition: background 0.2s;
}

.contact-info-item:hover {
    background: rgba(56, 189, 248, 0.1);
}

.contact-info-icon {
    width: 40px;
    height: 40px;
    background: rgba(56, 189, 248, 0.15);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-info-icon svg {
    width: 18px;
    height: 18px;
}

.contact-info-item {
    display: grid;
    /* แบ่งเป็น 2 คอลัมน์: คอลัมน์ไอคอน (ขนาดพอดีตัว) และ คอลัมน์ข้อความ (พื้นที่ที่เหลือ) */
    grid-template-columns: auto 1fr;
    gap: 0.75rem;
    /* ระยะห่างระหว่างไอคอนกับกลุ่มข้อความ */
    align-items: start;
    /* ให้ไอคอนอยู่ระดับเดียวกับบรรทัดแรก */
    margin-bottom: 1.25rem;
}

.contact-info-icon {
    /* ปรับแต่งไอคอนให้ดูเด่น */
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 2px;
    /* ช่วยขยับไอคอนให้ตรงกับกึ่งกลางของคำว่า 'โทรศัพท์' */
}

.contact-info-text {
    display: flex;
    flex-direction: column;
    /* ให้ 'โทรศัพท์' กับ 'เบอร์โทร' เรียงกันลงมา */
    gap: 0.15rem;
    /* ระยะห่างระหว่างหัวข้อกับเบอร์โทร */
}

.contact-info-text strong {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.2;
}

.contact-info-text span a {
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    word-break: break-all;
}

/* Table responsive on mobile */
@media (max-width: 768px) {
    table {
        min-width: 480px;
    }

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

    .hero-section h2 {
        font-size: 1.5rem;
    }

    .feature-card {
        padding: 1.5rem;
    }
}