/* ==========================================================================
   Koh Tao ProPhoto — design tokens
   Light, ocean-clean palette matching the Koh Tao ProVideo house style:
   white ground, deep ocean-blue headings, coral CTA.
   ========================================================================== */

:root {
  /* colour */
  --bg: #FFFFFF;           /* page background */
  --bg-alt: #F2F6F7;       /* alternating panel background */
  --panel: #FFFFFF;        /* card background */
  --line: rgba(11, 36, 54, 0.12);
  --ink: #0B2436;          /* primary text */
  --ink-dim: rgba(11, 36, 54, 0.68);
  --ink-faint: rgba(11, 36, 54, 0.45);
  --ocean: #154C8C;        /* deep ocean blue — headings / nav accents */
  --ocean-dark: #0B2A52;   /* header / footer background */
  --coral: #1E88E5;        /* primary CTA accent */
  --coral-dark: #1565C0;
  --on-coral: #FFFFFF;     /* text on coral buttons */

  /* type */
  --font-display: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* layout */
  --max: 1180px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  color: var(--ocean-dark);
}

h1 { font-size: clamp(2.3rem, 4.6vw, 3.8rem); font-weight: 500; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
h3 { font-size: 1.3rem; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--coral);
  font-weight: 600;
  margin-bottom: 0.9em;
}

p { color: var(--ink-dim); margin: 0 0 1em; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.btn-primary { background: var(--coral); color: var(--on-coral); }
.btn-primary:hover { transform: translateY(-1px); background: var(--coral-dark); }
.btn-outline { border-color: var(--line); color: var(--ocean-dark); }
.btn-outline:hover { border-color: var(--coral); color: var(--coral); }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--ocean-dark);
}
.brand .mark {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--coral), var(--ocean) 70%, var(--ocean-dark) 100%);
  flex: none;
}
.brand strong { font-weight: 600; }
.brand span { color: var(--coral); }

nav.main-nav { display: flex; align-items: center; gap: 4px; }
nav.main-nav > ul { display: flex; align-items: center; gap: 2px; }
nav.main-nav > ul > li { position: relative; }
nav.main-nav > ul > li > a,
nav.main-nav > ul > li > button.nav-toggle {
  display: block;
  padding: 10px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-dim);
  background: none;
  border: none;
  font-family: var(--font-body);
  cursor: pointer;
}
nav.main-nav > ul > li > a:hover,
nav.main-nav > ul > li > button.nav-toggle:hover,
nav.main-nav > ul > li.open > button.nav-toggle { color: var(--coral); }
nav.main-nav > ul > li.active-nav > a,
nav.main-nav > ul > li.active-nav > button.nav-toggle { color: var(--coral); }

.dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 28px rgba(11,36,54,0.24);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
}
li.open .dropdown, li:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown li a {
  display: block;
  padding: 9px 12px;
  font-size: 0.88rem;
  color: var(--ink-dim);
  border-radius: 2px;
}
.dropdown li a:hover { background: rgba(30, 136, 229, 0.08); color: var(--coral); }
.dropdown .cat-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 8px 12px 2px;
}

.header-cta { display: flex; align-items: center; gap: 14px; }
.header-cta .icon-link { color: var(--ink-dim); font-size: 1.05rem; }
.header-cta .icon-link:hover { color: var(--coral); }

.menu-btn {
  display: none;
  background: none; border: none; color: var(--ink);
  font-size: 1.5rem; cursor: pointer;
}

@media (max-width: 900px) {
  nav.main-nav { position: fixed; top: 78px; left: 0; right: 0; height: calc(100vh - 78px); background: var(--bg);
    flex-direction: column; align-items: stretch; padding: 20px 28px;
    transform: translateX(100%); transition: transform 0.25s ease; overflow-y: auto; }
  nav.main-nav.open { transform: translateX(0); }
  nav.main-nav > ul { flex-direction: column; align-items: stretch; gap: 0; }
  nav.main-nav > ul > li > a, nav.main-nav > ul > li > button.nav-toggle { padding: 14px 4px; width: 100%; text-align: left; font-size: 1.05rem; }
  .dropdown { position: static; opacity: 1; visibility: visible; transform: none; display: none; background: none; border: none; box-shadow: none; padding-left: 12px; }
  li.open .dropdown { display: block; }
  .menu-btn { display: block; }
  .header-cta .btn-outline { display: none; }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 88px;
  overflow: hidden;
  background:
    radial-gradient(1100px 480px at 80% -10%, rgba(30, 136, 229, 0.08), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, #EEF5F6 100%);
}
.hero .wrap { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero-copy p.lede { font-size: 1.12rem; color: var(--ink-dim); max-width: 46ch; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-frame {
  aspect-ratio: 4/5;
  border-radius: var(--radius);
  background: linear-gradient(160deg, #1D6FC4 0%, #154C8C 55%, #0B2A52 100%);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 48px -12px rgba(8,20,27,0.6), 0 8px 20px rgba(8,20,27,0.36);
}
.hero-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 0;
}
.hero-frame::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(420px 420px at 30% 15%, rgba(30,136,229,0.35), transparent 70%);
  z-index: 1;
}
.hero-frame.has-photo::before {
  background: linear-gradient(180deg, transparent 60%, rgba(4,12,18,0.55) 100%);
}
.hero-frame .cap {
  position: absolute; left: 18px; bottom: 16px; right: 18px;
  font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  z-index: 2;
}
.hero-frame.has-photo .cap { color: rgba(255,255,255,0.9); text-shadow: 0 1px 4px rgba(0,0,0,0.6); }
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-frame { max-width: 420px; }
}

/* ---------- generic sections ---------- */
.section { padding: 76px 0; }
.section-tight { padding: 52px 0; }
.section-mid { background: var(--bg-alt); }

.section-head { max-width: 640px; margin: 0 0 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 2px 10px rgba(11,36,54,0.13);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.card-with-photo:hover { box-shadow: 0 16px 32px -8px rgba(11,36,54,0.36); transform: translateY(-3px); }
.card h3 { margin-bottom: 10px; }
.card .num { font-family: var(--font-display); font-size: 1rem; color: var(--coral); margin-bottom: 12px; display: block; }

.card-with-photo { padding: 0; overflow: hidden; }
.card-photo { aspect-ratio: 4/3; overflow: hidden; background: linear-gradient(150deg, #1D6FC4, #154C8C 70%); }
.card-photo img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.5s ease; }
.card-with-photo:hover .card-photo img { transform: scale(1.06); }
.card-body { padding: 24px 28px 28px; }

.photo-block {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  aspect-ratio: var(--ar, 4/3);
  background: linear-gradient(150deg, #1D6FC4, #154C8C 70%);
  position: relative;
  overflow: hidden;
  display: block;
}
.photo-block--shadow {
  box-shadow: 0 10px 26px -8px rgba(11,36,54,0.48);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.photo-block--shadow:hover {
  box-shadow: 0 18px 36px -8px rgba(11,36,54,0.56);
  transform: translateY(-3px);
}
.photo-block--shadow img { transition: transform 0.5s ease; }
.photo-block--shadow:hover img { transform: scale(1.05); }
.photo-block img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: relative;
  z-index: 0;
}
.photo-block::after {
  content: attr(data-caption);
  position: absolute; left: 12px; bottom: 10px;
  font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: rgba(255,255,255,0.8);
  z-index: 2;
}
.photo-block::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(260px 260px at 70% 20%, rgba(30,136,229,0.3), transparent 70%);
  z-index: 1;
}
.photo-block.has-photo::before {
  background: linear-gradient(180deg, transparent 55%, rgba(4,12,18,0.65) 100%);
}
.photo-block.has-photo::after {
  color: #fff;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; text-align: center; }
.stats .stat b { display: block; font-family: var(--font-display); font-size: 2.5rem; color: var(--ocean); font-weight: 500; }
.stats .stat span { font-size: 0.85rem; color: var(--ink-dim); letter-spacing: 0.02em; }
@media (max-width: 620px) { .stats { grid-template-columns: 1fr; } }

.logos { display: flex; flex-wrap: wrap; gap: 34px; align-items: center; justify-content: center; }
.logos .logo-chip {
  width: 138px; height: 138px; border-radius: 50%;
  background: var(--panel); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  padding: 21px;
  box-shadow: 0 2px 10px rgba(11,36,54,0.14);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.logos .logo-chip:hover { box-shadow: 0 8px 20px rgba(11,36,54,0.26); transform: translateY(-2px); }
.logos .logo-chip img { width: 100%; height: 100%; object-fit: contain; }

/* course rows */
.course-row {
  display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; align-items: center;
  padding: 52px 0; border-top: 1px solid var(--line);
}
.course-row:first-of-type { border-top: none; }
.course-row.reverse { direction: rtl; }
.course-row.reverse > * { direction: ltr; }
.course-row .tag {
  display: inline-block; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ocean); border: 1px solid rgba(14,92,115,0.35); border-radius: 20px;
  padding: 4px 12px; margin-bottom: 14px;
}
.course-row ul { margin: 18px 0; }
.course-row ul li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--ink-dim); font-size: 0.95rem; }
.course-row ul li::before { content: "—"; position: absolute; left: 0; color: var(--coral); }
@media (max-width: 800px) { .course-row, .course-row.reverse { grid-template-columns: 1fr; direction: ltr; } }

/* gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.gallery-grid .photo-block { cursor: pointer; }
@media (max-width: 900px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 620px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-bar button {
  background: var(--panel); border: 1px solid var(--line); color: var(--ink-dim);
  padding: 8px 16px; border-radius: 20px; font-size: 0.84rem; cursor: pointer; font-family: var(--font-body);
}
.filter-bar button.active, .filter-bar button:hover { border-color: var(--coral); color: var(--coral); }

.lightbox {
  position: fixed; inset: 0; background: rgba(8, 20, 27, 0.92);
  display: none; align-items: center; justify-content: center; z-index: 300; padding: 40px;
}
.lightbox.open { display: flex; }
.lightbox .photo-block {
  width: auto;
  aspect-ratio: auto;
  max-width: 90vw;
  max-height: 85vh;
  background: none;
  border: none;
  box-shadow: none;
}
.lightbox .photo-block img {
  width: auto;
  height: auto;
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
}
.lightbox .close { position: absolute; top: 26px; right: 34px; color: #fff; font-size: 2rem; background: none; border: none; cursor: pointer; }

/* testimonials */
.quote-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: 0 2px 10px rgba(11,36,54,0.13); }
.quote-card:nth-child(even) { background: rgba(30,136,229,0.06); border-color: rgba(30,136,229,0.22); }
.quote-card p.quote { font-family: var(--font-display); font-size: 1.12rem; color: var(--ink); font-weight: 400; }
.quote-card .who { font-size: 0.84rem; color: var(--ink-faint); letter-spacing: 0.02em; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact-list li { padding: 16px 0; border-top: 1px solid var(--line); }
.contact-list li:first-child { border-top: none; }
.contact-list .label { display: block; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--coral); margin-bottom: 4px; }
.map-frame { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.map-frame iframe { width: 100%; height: 320px; border: 0; display: block; }
form.enquiry { display: grid; gap: 16px; }
form.enquiry label { font-size: 0.82rem; color: var(--ink-dim); display: block; margin-bottom: 6px; }
form.enquiry input, form.enquiry select, form.enquiry textarea {
  width: 100%; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; color: var(--ink); font-family: var(--font-body); font-size: 0.95rem;
}
form.enquiry textarea { resize: vertical; min-height: 110px; }
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */
footer.site-footer { background: var(--ocean-dark); color: rgba(255,255,255,0.85); padding: 56px 0 26px; }
footer.site-footer .brand, footer.site-footer .brand span:not(.mark) { color: #fff; }
.footer-grid { display: grid; grid-template-columns: minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1fr); gap: 40px; margin-bottom: 44px; }
.footer-grid h5 { color: #fff; font-family: var(--font-body); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px; }
.footer-grid p { color: rgba(255,255,255,0.65); max-width: 100%; }
.footer-grid a { display: block; color: rgba(255,255,255,0.65); font-size: 0.9rem; padding: 5px 0; word-break: break-word; }
.footer-grid a:hover { color: var(--coral); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 26px; border-top: 1px solid rgba(255,255,255,0.14); font-size: 0.82rem; color: rgba(255,255,255,0.5); flex-wrap: wrap; gap: 12px; }
.social-row { display: flex; gap: 14px; }
.social-row a { color: rgba(255,255,255,0.65); font-size: 1rem; }
.social-row a:hover { color: var(--coral); }
@media (max-width: 800px) { .footer-grid { grid-template-columns: minmax(0,1fr) minmax(0,1fr); } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; gap: 32px; } }

/* utility — progressive-enhancement reveal: content is visible by default,
   JS opts elements into the fade/rise effect so a JS failure never hides content */
.reveal.js-armed { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.js-armed.in { opacity: 1; transform: translateY(0); }
.center-text { text-align: center; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal.js-armed { opacity: 1; transform: none; transition: none; }
}