/* ============================================
   MartinEdu — style.css
   Design system: warm parchment, editorial minimal
   Mobile-first, fully responsive
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=Archivo:wght@300;400;500&display=swap');

/* ── Tokens ─────────────────────────────── */
:root {
  --parchment:     #f5efe6;
  --parchment-mid: #ede4d6;
  --parchment-deep:#e0d3c0;
  --ink:           #1c1712;
  --ink-mid:       #4a3f33;
  --ink-light:     #8a7a6a;
  --accent:        #8b5e3c;
  --accent-light:  #c4956a;
  --rule:          rgba(139, 94, 60, 0.25);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'Archivo', Helvetica, sans-serif;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  8rem;

  --max-w: 1100px;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ── Reset ───────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background-color: var(--parchment);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Typography ──────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 8vw, 5rem); }
h2 { font-size: clamp(1.6rem, 5vw, 2.8rem); }
h3 { font-size: clamp(1.1rem, 3vw, 1.6rem); }

p { max-width: 68ch; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--ink); }

/* ── Layout ──────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-md); }
}

/* ── Nav ─────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--parchment);
  border-bottom: 1px solid var(--rule);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
}

@media (min-width: 768px) {
  .nav-inner { padding: 0.9rem var(--space-md); }
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.02em;
  z-index: 201;
  position: relative;
}
.nav-logo span { color: var(--accent); }

/* Hamburger button */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 201;
  position: relative;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (min-width: 768px) {
  .nav-toggle { display: none; }
}

/* Nav links — mobile drawer */
.nav-links {
  display: flex;
  flex-direction: column;
  list-style: none;
  position: fixed;
  top: 0;
  right: 0;
  width: min(280px, 80vw);
  height: 100vh;
  background: var(--parchment);
  border-left: 1px solid var(--rule);
  padding: 5rem 2rem 2rem;
  gap: 0;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 200;
  box-shadow: -4px 0 24px rgba(28,23,18,0.08);
}

.nav-links.open {
  transform: translateX(0);
}

.nav-links li {
  border-bottom: 1px solid var(--rule);
}

.nav-links a {
  display: block;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mid);
  padding: 1rem 0;
  border-bottom: none;
  transition: color var(--transition);
}

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

/* Overlay behind mobile menu */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(28,23,18,0.3);
  z-index: 199;
}
.nav-overlay.open { display: block; }

/* Desktop nav */
@media (min-width: 768px) {
  .nav-links {
    position: static;
    flex-direction: row;
    width: auto;
    height: auto;
    background: none;
    border: none;
    padding: 0;
    gap: var(--space-md);
    transform: none;
    box-shadow: none;
  }

  .nav-links li { border: none; }

  .nav-links a {
    padding: 0 0 2px;
    border-bottom: 1px solid transparent;
    transition: color var(--transition), border-color var(--transition);
  }

  .nav-links a:hover,
  .nav-links a.active {
    color: var(--ink);
    border-bottom-color: var(--accent);
  }
}

/* ── Horizontal rule ─────────────────────── */
.rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: var(--space-lg) 0;
}

/* ── Buttons ─────────────────────────────── */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.85rem 1.75rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn:hover { background: var(--ink); color: var(--parchment); }

.btn-accent {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-accent:hover { background: var(--accent); color: var(--parchment); }

/* ── Cards ───────────────────────────────── */
.card {
  background: var(--parchment-mid);
  border: 1px solid var(--parchment-deep);
  padding: 1.25rem;
  transition: border-color var(--transition), transform var(--transition);
}

@media (min-width: 768px) {
  .card { padding: var(--space-md); }
}

.card:hover {
  border-color: var(--accent-light);
  transform: translateY(-3px);
}

.card-thumb {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--parchment-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  overflow: hidden;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-label {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--space-xs);
}

.card-desc {
  font-size: 0.875rem;
  color: var(--ink-mid);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

/* ── Grids ───────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 600px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { gap: var(--space-md); }
}

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ── Sections ────────────────────────────── */
.section { padding: 4rem 0; }
.section-sm { padding: var(--space-lg) 0; }

@media (min-width: 768px) {
  .section { padding: var(--space-xl) 0; }
}

.section-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.section-title { margin-bottom: var(--space-md); }

/* ── Two-column layout helper ────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (min-width: 768px) {
  .two-col { grid-template-columns: 1fr 1fr; gap: 4rem; }
}

.two-col-wide {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (min-width: 768px) {
  .two-col-wide { grid-template-columns: 2fr 1fr; gap: 6rem; }
}

/* ── CTA strip ───────────────────────────── */
.cta-strip {
  background: var(--ink);
  padding: 3.5rem 0;
  text-align: center;
}

@media (min-width: 768px) {
  .cta-strip { padding: 5rem 0; }
}

/* ── Footer ──────────────────────────────── */
footer {
  border-top: 1px solid var(--rule);
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-light);
  letter-spacing: 0.05em;
}

/* ── Animations ──────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up { animation: fadeUp 0.8s ease both; }
.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.25s; }
.fade-up-3 { animation-delay: 0.4s; }
.fade-up-4 { animation-delay: 0.55s; }

/* ── Placeholder state ───────────────────── */
.placeholder-thumb {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--ink-light);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.placeholder-thumb svg {
  opacity: 0.3;
  width: 32px;
  height: 32px;
}

/* ── Utility ─────────────────────────────── */
.text-center { text-align: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }