/* ===== CSS CUSTOM PROPERTIES (from DESIGN.md) ===== */
:root {
  --color-primary: #439600;
  --color-primary-hover: #357800;
  --color-secondary: #66C15C;
  --color-dark: #1A202C;
  --color-accent: #FFD700;
  --color-bg: #F8FAF5;
  --color-surface: #FFFFFF;
  --color-muted: #5A6570;
  --color-border: #E2E8F0;
  --color-text: #1A202C;

  --font-display: 'Fahkwang', sans-serif;
  --font-body: 'Kodchasan', sans-serif;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease-out;
}
a:hover { color: var(--color-primary-hover); }

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

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 32, 44, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: background 0.3s ease-out;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.header__logo-img {
  height: 40px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header__link {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color 0.2s;
}
.header__link:hover { color: #FFFFFF; }

.header__link--cta {
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 8px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
}
.header__link--cta:hover {
  background: var(--color-primary-hover);
  color: #FFFFFF;
}
.header__link--disabled {
  background: var(--color-muted);
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.7;
}

.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #FFFFFF;
  transition: all 0.3s;
}

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, var(--color-dark) 0%, #2D3748 100%);
  padding: calc(72px + var(--space-3xl)) 0 var(--space-3xl);
  text-align: center;
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.hero__grid-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 80px,
    rgba(67, 150, 0, 0.04) 80px,
    rgba(67, 150, 0, 0.04) 81px
  ),
  repeating-linear-gradient(
    0deg,
    transparent,
    transparent 80px,
    rgba(67, 150, 0, 0.04) 80px,
    rgba(67, 150, 0, 0.04) 81px
  );
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
}

.hero__subtitle {
  font-size: 18px;
  color: #A0AEC0;
  max-width: 620px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.hero__stat { text-align: center; }

.hero__stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-accent);
}

.hero__stat-label {
  display: block;
  font-size: 13px;
  color: #A0AEC0;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  padding: 14px 36px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease-out;
  text-align: center;
}

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

.btn--ghost {
  background: transparent;
  color: #FFFFFF;
  border: 1px solid rgba(255,255,255,0.3);
}
.btn--ghost:hover {
  border-color: rgba(255,255,255,0.6);
  color: #FFFFFF;
}

.btn--full { width: 100%; }

.btn--disabled {
  background: var(--color-muted);
  color: rgba(255,255,255,0.7);
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.7;
}

/* ===== BADGE ===== */
.badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge--accent {
  background: var(--color-accent);
  color: var(--color-dark);
}
.badge--closed {
  background: var(--color-muted);
  color: #FFFFFF;
}

/* ===== SECTIONS ===== */
.section {
  padding: var(--space-3xl) 0;
}

.section--dark {
  background: var(--color-dark);
  color: #FFFFFF;
}

.section--alt {
  background: var(--color-surface);
}

.section__label {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}
.section__label--light { color: var(--color-secondary); }

.section__title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-xl);
  color: var(--color-dark);
}
.section__title--light { color: #FFFFFF; }

.section__intro {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 700px;
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

/* ===== ABOUT SECTION ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.about__content p {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
  color: var(--color-muted);
}
.about__content p strong { color: var(--color-dark); }

.diagram-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
}
.diagram-card--highlight {
  border-color: var(--color-primary);
  background: rgba(67, 150, 0, 0.04);
}

.diagram-card__header {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}
.diagram-card--highlight .diagram-card__header { color: var(--color-primary); }

.diagram-card__flow {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.diagram-card__step {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  background: var(--color-bg);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-dark);
}
.diagram-card--highlight .diagram-card__step {
  background: rgba(67, 150, 0, 0.1);
  color: var(--color-primary);
}

.diagram-card__arrow {
  color: var(--color-muted);
  font-size: 18px;
}

.about__why { margin-top: var(--space-xl); }
.about__why-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

.about__why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.about__why-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.about__why-number {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
  margin-bottom: var(--space-xs);
}

.about__why-card p {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* ===== CURRICULUM ===== */
.curriculum__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.curriculum-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}
.curriculum-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.curriculum-card__month {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-primary);
  background: rgba(67, 150, 0, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}

.curriculum-card__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--space-xs);
}

.curriculum-card__desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.curriculum__skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
}

.curriculum__skill-tag {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

/* ===== WHO SHOULD APPLY ===== */
.apply__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.apply__column-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}
.apply__column-title--yes { border-color: var(--color-primary); color: var(--color-primary); }
.apply__column-title--no { border-color: #E53E3E; color: #E53E3E; }

.apply__list { list-style: none; }

.apply__item {
  padding: var(--space-sm) 0;
  padding-left: var(--space-lg);
  position: relative;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
  line-height: 1.5;
  color: var(--color-muted);
}
.apply__item:last-child { border-bottom: none; }

.apply__item::before {
  position: absolute;
  left: 0;
  top: var(--space-sm);
  font-size: 16px;
}
.apply__item--yes::before { content: '\2713'; color: var(--color-primary); font-weight: 700; }
.apply__item--no::before { content: '\2717'; color: #E53E3E; font-weight: 700; }

/* ===== HOW IT WORKS ===== */
.how__details {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.how__detail-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
}

.how__detail-icon {
  font-size: 32px;
  display: block;
  margin-bottom: var(--space-sm);
}

.how__detail-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-dark);
}

.how__detail-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.5;
}

.how__schedule-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  text-align: center;
}

.how__schedule-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
}

.how__day {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}
.how__day--office {
  border-color: var(--color-primary);
  background: rgba(67, 150, 0, 0.04);
}

.how__day-name {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.how__day-type {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-xs);
}
.how__day--office .how__day-type { color: var(--color-primary); }
.how__day .how__day-type { color: var(--color-muted); }

.how__day-desc {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.4;
}

/* ===== APPLICATION PROCESS ===== */
.process__timeline {
  max-width: 700px;
  margin: 0 auto var(--space-2xl);
}

.process__stage {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}
.process__stage:last-child { border-bottom: none; }

.process__stage-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.process__stage-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-dark);
}

.process__stage-content p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.5;
  margin-bottom: 4px;
}

.process__stage-time {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.process__dates {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.process__date { text-align: center; }

.process__date-label {
  display: block;
  font-size: 12px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.process__date-value {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.process__date-arrow {
  font-size: 24px;
  color: var(--color-border);
}

/* ===== FAQ ===== */
.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xs);
  overflow: hidden;
  background: var(--color-bg);
}

.faq__question {
  width: 100%;
  background: none;
  border: none;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  color: var(--color-dark);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  transition: background 0.2s;
}
.faq__question:hover { background: rgba(67, 150, 0, 0.04); }

.faq__icon {
  font-size: 22px;
  color: var(--color-primary);
  transition: transform 0.2s ease-out;
  flex-shrink: 0;
  margin-left: var(--space-sm);
}

.faq__item.active .faq__icon { transform: rotate(45deg); }

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.faq__item.active .faq__answer {
  max-height: 300px;
  padding: 0 var(--space-md) var(--space-md);
}

.faq__answer p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ===== CONTACT ===== */
.contact__intro {
  color: rgba(255,255,255,0.6);
  font-size: 15px;
  margin-bottom: var(--space-xl);
  max-width: 600px;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact__form-wrapper {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.form-group { margin-bottom: var(--space-sm); }

.form-label {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(67, 150, 0, 0.1);
}
.form-input::placeholder { color: #A0AEC0; }

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.contact__status {
  margin-top: var(--space-sm);
  font-size: 14px;
  text-align: center;
}
.contact__status--success { color: var(--color-secondary); }
.contact__status--error { color: #E53E3E; }

.contact__info {
  color: rgba(255,255,255,0.8);
}

.contact__info-block {
  margin-bottom: var(--space-lg);
}

.contact__info-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}

.contact__info-block p {
  line-height: 1.6;
  font-size: 15px;
}

.contact__link {
  color: var(--color-accent);
  text-decoration: none;
}
.contact__link:hover { text-decoration: underline; color: var(--color-accent); }

/* ===== FOOTER ===== */
.footer {
  background: var(--color-dark);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: var(--space-xl) 0;
  text-align: center;
  color: rgba(255,255,255,0.5);
}

.footer__brand {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  margin-bottom: 4px;
}

.footer__address {
  font-size: 14px;
  margin-bottom: var(--space-sm);
}

.footer__copy {
  font-size: 13px;
}

/* ===== ANIMATIONS ===== */
/* Sections start visible. JS adds .fade-in-ready class to enable animation. */
.fade-in-ready {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.fade-in-ready.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .how__details { grid-template-columns: repeat(2, 1fr); }
  .how__schedule-grid { grid-template-columns: repeat(3, 1fr); }
  .curriculum__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-dark);
    flex-direction: column;
    padding: var(--space-md);
    gap: 0;
    border-top: 1px solid rgba(255,255,255,0.08);
  }
  .header__nav.active { display: flex; }
  .header__link {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    width: 100%;
    text-align: center;
  }
  .header__link--cta {
    margin-top: var(--space-sm);
    text-align: center;
  }
  .header__hamburger { display: flex; }
  .header__hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .header__hamburger.active span:nth-child(2) { opacity: 0; }
  .header__hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero { padding: calc(72px + var(--space-2xl)) 0 var(--space-2xl); }
  .hero__title { font-size: 32px; }
  .hero__subtitle { font-size: 16px; }
  .hero__stats { flex-wrap: wrap; gap: var(--space-md); }
  .hero__stat { flex: 0 0 calc(50% - var(--space-md) / 2); }
  .hero__actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 300px; }

  .section__title { font-size: 28px; }
  .section { padding: var(--space-2xl) 0; }

  .about__grid { grid-template-columns: 1fr; }
  .about__why-grid { grid-template-columns: 1fr; }
  .curriculum__grid { grid-template-columns: 1fr; }
  .apply__grid { grid-template-columns: 1fr; }
  .how__details { grid-template-columns: 1fr; }
  .how__schedule-grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }

  .process__dates { flex-direction: column; }
  .process__date-arrow { transform: rotate(90deg); }
}

@media (max-width: 480px) {
  .hero__title { font-size: 26px; }
  .hero__stat-value { font-size: 20px; }
  .section__title { font-size: 24px; }
}