/* 
    Color Palette: Graphite-Copper
    --color-background: #121212 (เกือบดำ)
    --color-surface: #1E1E1E (เทาเข้ม)
    --color-primary: #D97706 (ทองแดงเข้ม/อำพัน)
    --color-secondary: #FBBF24 (ทองแดงสว่าง/เหลือง)
    --color-text-primary: #F3F4F6 (ขาวนวล)
    --color-text-secondary: #9CA3AF (เทาอ่อน)
*/

:root {
    --color-background: #121212;
    --color-surface: #1E1E1E;
    --color-primary: #D97706;
    --color-secondary: #FBBF24;
    --color-text-primary: #F3F4F6;
    --color-text-secondary: #9CA3AF;
    --font-family-sans: 'Helvetica Neue', Arial, sans-serif;
    --shadow-subtle: 0 4px 12px rgba(0, 0, 0, 0.25);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.7;
    font-size: 16px;
}

h1, h2, h3, h4 {
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
    font-weight: 700;
}

h1 {
    font-size: clamp(48px, 9vw, 70px);
    font-weight: 900;
}

h2 {
    font-size: clamp(32px, 6vw, 56px);
}

h3 {
    font-size: clamp(20px, 4vw, 24px);
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

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

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

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

ul {
    list-style: none;
}

/* --- Layout & Containers --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto;
    color: var(--color-text-secondary);
}

.text-center {
    text-align: center;
}

/* --- Header (MANDATORY) --- */
.site-header {
    position: relative;
    width: 100%;
    padding: 15px 10px;
    background-color: var(--color-surface);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 28px;
    font-weight: 900;
    z-index: 100;
    color: var(--color-text-primary);
}

.hamburger {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 24px;
    cursor: pointer;
    z-index: 100;
    display: none;
}

.hamburger .line {
    width: 100%;
    height: 3px;
    background-color: var(--color-text-primary);
    margin: 5px 0;
    transition: 0.3s;
}

.menu-checkbox {
    display: none;
}

.desktop-nav {
    display: block;
}

.desktop-nav .nav-list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.desktop-nav a {
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 16px;
}
.desktop-nav a:hover {
    color: var(--color-primary);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 70px; /* Adjust based on header height */
    left: 0;
    right: 0;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
    z-index: 99;
    background-color: var(--color-surface);
}

.mobile-nav ul {
    list-style: none;
    padding: 20px;
    margin: 0;
}

.mobile-nav li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.mobile-nav a {
    color: var(--color-text-primary);
    display: block;
    width: 100%;
    font-size: 18px;
}

@media (max-width: 768px) {
    .desktop-nav { display: none; }
    .hamburger { display: block; }
    .mobile-nav { display: block; }
    #menu-toggle:checked ~ .mobile-nav { max-height: 400px; }
    #menu-toggle:checked ~ .hamburger .line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    #menu-toggle:checked ~ .hamburger .line:nth-child(2) { opacity: 0; }
    #menu-toggle:checked ~ .hamburger .line:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
    border-radius: 0; /* Sharp style */
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-background);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-background);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

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

/* --- Hero Section (Circle Image) --- */
.hero-circle-image {
    padding: 100px 0;
}
.hero-container {
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    gap: 40px;
}
.hero-content {
    text-align: center;
}
.hero-title {
    color: var(--color-text-primary);
}
.hero-subtitle {
    font-size: clamp(16px, 3vw, 20px);
    margin: 20px auto 30px;
    max-width: 60ch;
}
.hero-image-wrapper {
    display: flex;
    justify-content: center;
}
.hero-image-circle {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: 50%;
    border: 8px solid var(--color-surface);
    box-shadow: var(--shadow-subtle);
}

@media (min-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr 1fr;
        gap: 80px;
    }
    .hero-content {
        text-align: left;
    }
    .hero-subtitle {
        margin-left: 0;
        margin-right: 0;
    }
    .hero-image-circle {
        width: 400px;
        height: 400px;
    }
}

/* --- Benefits Section (3 Columns) --- */
.benefits-grid-3col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}
.benefit-card {
    background-color: var(--color-surface);
    padding: 32px;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: var(--shadow-subtle);
}
.card-title {
    color: var(--color-secondary);
    margin-bottom: 16px;
}

@media (min-width: 768px) {
    .benefits-grid-3col {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* --- Checklist Section --- */
.checklist-section {
    background-color: var(--color-surface);
}
.checklist-grid-2col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
.checklist {
    padding: 0;
    margin: 0;
}
.checklist-item {
    padding-left: 36px;
    position: relative;
    font-size: 18px;
    margin-bottom: 16px;
}
.checklist-item::before {
    content: '✔';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-primary);
    font-size: 24px;
    line-height: 1;
}

@media (min-width: 768px) {
    .checklist-grid-2col {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

/* --- Accordion FAQ Section --- */
.accordion-container {
    max-width: 800px;
    margin: 0 auto;
}
.accordion-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.accordion-title {
    padding: 24px 0;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    display: block;
    position: relative;
    padding-right: 30px;
}
.accordion-title::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 28px;
    color: var(--color-primary);
    transition: transform 0.3s ease;
}
.accordion-item[open] > .accordion-title::after {
    transform: translateY(-50%) rotate(45deg);
}
.accordion-content {
    padding-bottom: 24px;
}
.accordion-content p {
    max-width: 100%;
}

/* --- Expert Block Section --- */
.expert-section {
    background-color: var(--color-surface);
}
.expert-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}
.expert-image {
    width: 100%;
    height: auto;
    object-fit: cover;
}
.expert-quote {
    font-size: clamp(20px, 4vw, 28px);
    font-style: italic;
    line-height: 1.4;
    border-left: 4px solid var(--color-primary);
    padding-left: 30px;
    margin-bottom: 24px;
}
.expert-cite {
    display: block;
    font-style: normal;
}
.expert-name {
    display: block;
    font-weight: 700;
    font-size: 18px;
    color: var(--color-text-primary);
}
.expert-title {
    display: block;
    color: var(--color-text-secondary);
}
@media (min-width: 768px) {
    .expert-container {
        grid-template-columns: 1fr 2fr;
    }
}

/* --- Testimonials Section --- */
.testimonials-list {
    display: grid;
    gap: 24px;
}
.testimonial-item {
    background-color: var(--color-surface);
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.testimonial-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.testimonial-author {
    font-weight: 700;
    font-size: 18px;
}
.testimonial-rating {
    color: var(--color-secondary);
}
.testimonial-text {
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* --- Program Page --- */
.page-header-section {
    padding: 60px 0;
    text-align: center;
    background-color: var(--color-surface);
}
.page-title {
    margin-bottom: 16px;
}
.page-subtitle {
    max-width: 800px;
    margin: 0 auto;
}
.program-intro {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 60px;
}
.program-intro-image {
    width: 100%;
}
@media (min-width: 992px) {
    .program-intro {
        grid-template-columns: 1fr 1fr;
    }
}
.large-accordion .accordion-title {
    font-size: 22px;
}
.large-accordion .accordion-content p {
    font-size: 16px;
}

/* --- Mission Page (Timeline) --- */
.timeline-intro {
    text-align: center;
    margin-bottom: 80px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
.timeline-container {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}
.timeline-container::after {
    content: '';
    position: absolute;
    width: 3px;
    background-color: var(--color-primary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1.5px;
}
.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
}
.timeline-item:nth-child(odd) {
    left: 0;
}
.timeline-item:nth-child(even) {
    left: 50%;
}
.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--color-background);
    border: 3px solid var(--color-primary);
    top: 25px;
    border-radius: 50%;
    z-index: 1;
}
.timeline-item:nth-child(even)::after {
    left: -10px;
}
.timeline-content {
    padding: 20px;
    background-color: var(--color-surface);
    position: relative;
    box-shadow: var(--shadow-subtle);
}
.timeline-date {
    font-size: 24px;
    font-weight: 900;
    color: var(--color-secondary);
    margin-bottom: 10px;
}
.timeline-item:nth-child(odd) .timeline-date { text-align: right; padding-right: 20px; }
.timeline-item:nth-child(even) .timeline-date { text-align: left; padding-left: 20px; }

@media (max-width: 768px) {
    .timeline-container::after { left: 10px; }
    .timeline-item { width: 100%; padding-left: 50px; padding-right: 10px; }
    .timeline-item:nth-child(even) { left: 0; }
    .timeline-item::after { left: 1px; }
    .timeline-item:nth-child(odd) .timeline-date,
    .timeline-item:nth-child(even) .timeline-date { text-align: left; padding-left: 0; }
}
.mission-image-section {
    padding-top: 80px;
}
.full-width-image {
    width: 100%;
    margin-bottom: 40px;
}
.mission-manifesto {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* --- Contact Page --- */
.contact-grid-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}
.contact-heading {
    margin-bottom: 24px;
    color: var(--color-primary);
}
.contact-item {
    margin-bottom: 20px;
}
.contact-item-title {
    font-size: 18px;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}
.contact-form .form-group {
    margin-bottom: 20px;
}
.contact-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--color-surface);
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--color-text-primary);
    font-size: 16px;
    border-radius: 0;
}
.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}
.form-submit-btn {
    width: 100%;
}
@media (min-width: 992px) {
    .contact-grid-container {
        grid-template-columns: 1fr 1.5fr;
        gap: 60px;
    }
}

/* --- Legal & Thank You Pages --- */
.legal-page .container, .thank-you-section .container {
    max-width: 800px;
}
.legal-page h2 {
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--color-primary);
}
.legal-page ul {
    list-style: disc;
    padding-left: 20px;
}
.thank-you-content {
    margin-top: 40px;
}
.thank-you-links {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

/* --- Footer --- */
.site-footer {
    background-color: var(--color-surface) !important;
    color: var(--color-text-secondary) !important;
    padding: 60px 0 0;
    font-size: 14px;
}
.footer-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}
.footer-column p, .footer-column a {
    color: var(--color-text-secondary) !important;
}
.footer-heading {
    font-size: 18px;
    color: var(--color-text-primary) !important;
    margin-bottom: 16px;
}
.footer-links {
    list-style: none;
    padding: 0;
}
.footer-links li {
    margin-bottom: 10px;
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    padding: 24px 0;
    margin-top: 40px;
}
@media (min-width: 768px) {
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1024px) {
    .footer-container {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* --- Cookie Banner --- */
#cookie-banner {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 9999;
    padding: 18px 24px;
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 16px;
    transform: translateY(0); transition: transform 0.4s ease;
    background-color: var(--color-surface);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.3);
}
#cookie-banner.hidden { transform: translateY(110%); }
#cookie-banner p { margin: 0; flex: 1; min-width: 200px; font-size: 14px; }
#cookie-banner a {
    text-decoration: underline;
}
.cookie-btns { display: flex; gap: 10px; flex-shrink: 0; flex-wrap: wrap; }
.cookie-btn-accept, .cookie-btn-decline {
    padding: 8px 16px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    border-radius: 0;
    transition: background-color 0.3s ease;
}
.cookie-btn-accept {
    background-color: var(--color-primary);
    color: var(--color-background);
}
.cookie-btn-decline {
    background-color: transparent;
    border: 1px solid var(--color-text-secondary);
    color: var(--color-text-secondary);
}
.cookie-btn-accept:hover { background-color: var(--color-secondary); }
.cookie-btn-decline:hover { background-color: var(--color-text-secondary); color: var(--color-background); }

@media (max-width: 600px) {
    #cookie-banner { flex-direction: column; align-items: flex-start; }
    .cookie-btns { width: 100%; }
    .cookie-btn-accept, .cookie-btn-decline { flex: 1; text-align: center; }
}