/* ============================================================
   ÄLLIÄ ja TEKOÄLLIÄ – Tyylitiedosto
   Värit logosta (Eduks): vihreä gradientti + sininen aksentti
   Noudattaa WCAG 2.1 AA -saavutettavuusohjeistusta
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap');

/* --- CSS-muuttujat --- */
:root {
  --green-light:   #4cd137;
  --green-mid:     #27ae60;
  --green-dark:    #1a6b35;
  --blue-accent:   #29b6f6;
  --blue-dark:     #0288d1;
  --red-yt:        #cc0000;
  --red-yt-dark:   #a50000;
  --white:         #ffffff;
  --off-white:     #f4faf5;
  --text-dark:     #1a2e1d;
  --text-mid:      #2d4a32;
  --text-light:    #5a7a5e;
  --card-bg:       #ffffff;
  --card-shadow:   0 4px 24px rgba(30, 100, 50, 0.10);
  --border-radius: 16px;
  --transition:    0.25s ease;
  --focus-outline: 3px solid var(--blue-accent);
  --max-width:     1100px;
}

/* --- Reset & pohja --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: 'Nunito', sans-serif;
  background-color: var(--off-white);
  color: var(--text-dark);
  line-height: 1.65;
}

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

/* --- Skip-to-content --- */
.skip-link {
  position: absolute;
  top: -100px; left: 16px;
  background: var(--blue-accent);
  color: var(--white);
  padding: 10px 18px;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  z-index: 9999;
  text-decoration: none;
  transition: top var(--transition);
}
.skip-link:focus { top: 0; }

/* --- Focus --- */
:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 64px 0; }

/* ============================================================
   NAVIGAATIO
   ============================================================ */
.site-nav {
  background: rgba(30, 90, 50, 0.85); /* Glassmorphism */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 8px rgba(0,0,0,0.12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo img { height: 34px; width: auto; }
.nav-logo span {
  color: var(--white);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.2px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}
.nav-links a {
  color: rgba(255,255,255,0.90);
  text-decoration: none;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 6px;
  transition: background var(--transition);
  font-size: 0.9rem;
}
.nav-links a:hover,
.nav-links a:focus-visible { background: rgba(255,255,255,0.15); }

.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid rgba(255,255,255,0.5);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
}



/* ============================================================
   OSIO-OTSIKOT
   ============================================================ */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(90deg, var(--green-mid), var(--blue-accent));
  color: var(--white);
  font-weight: 800;
  font-size: 0.75rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 5px 16px;
  border-radius: 100px;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  font-weight: 900;
  line-height: 1.2;
  background: linear-gradient(45deg, var(--green-dark), #9b59b6, var(--blue-accent), var(--green-mid));
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientFlow 8s ease infinite;
}

@keyframes gradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.section-header p {
  color: var(--text-light);
  margin-top: 12px;
  font-size: 1.05rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.section-students { background: var(--off-white); }
.section-teachers { background: #eaf7ee; }

/* ============================================================
   VISUAALISET KORTIT (iso kuva ylhäällä)
   ============================================================ */
.visual-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.visual-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1.5px solid rgba(76, 209, 55, 0.12);
  transition: transform var(--transition), box-shadow var(--transition);
}

.visual-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 40px rgba(30, 100, 50, 0.16);
}

/* Kuvaosio kortin yläosa */
.visual-card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  flex-shrink: 0;
}

.visual-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.visual-card:hover .visual-card-image img {
  transform: scale(1.04);
}

/* Overlay-etiketti kuvan päällä */
.visual-card-overlay {
  position: absolute;
  bottom: 12px;
  left: 14px;
}

.card-label {
  background: rgba(26, 107, 53, 0.88);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 6px;
  backdrop-filter: blur(4px);
}

.card-label-lukio {
  background: rgba(2, 136, 209, 0.88); /* blue-dark */
}

/* Korttirunko */
.visual-card-body {
  padding: 28px 26px 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.visual-card-body h3 {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-dark);
  line-height: 1.25;
  overflow-wrap: break-word;
  word-wrap: break-word;
  hyphens: auto;
}

.visual-card-body p {
  color: var(--text-light);
  font-size: 0.97rem;
  line-height: 1.65;
  flex: 1;
}

/* Kortti ilman kuvaa: apuopettaja-banneri */
.visual-card-banner {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 100%);
  border-color: transparent;
}

.visual-card-banner .visual-card-body h3 { color: var(--white); }
.visual-card-banner .visual-card-body p   { color: rgba(255,255,255,0.88); }

/* Kortti ilman kuvaa: YouTube */
.visual-card-yt {
  background: #1a1a1a;
  border-color: transparent;
}

.visual-card-yt .visual-card-body h3 { color: var(--white); }
.visual-card-yt .visual-card-body p   { color: rgba(255,255,255,0.75); }

/* ============================================================
   PAINIKKEET
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 0.97rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  border-radius: 10px;
  padding: 12px 24px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  align-self: stretch;
  justify-content: center;
  text-align: center;
  width: 100%;
}

@media (min-width: 600px) {
  .btn {
    width: auto;
    align-self: flex-start;
  }
}

.visual-card-body .btn {
  width: 100%;
  align-self: stretch;
}


.btn-primary {
  background: linear-gradient(135deg, var(--green-mid), var(--green-dark));
  color: var(--white);
  box-shadow: 0 4px 14px rgba(27, 132, 60, 0.30);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(27, 132, 60, 0.40);
}

.btn-secondary {
  background: var(--blue-accent);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(41, 182, 246, 0.30);
}
.btn-secondary:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(41, 182, 246, 0.40);
}

.btn-outline {
  background: transparent;
  color: var(--green-dark);
  border: 2px solid var(--green-mid);
}
.btn-outline:hover {
  background: var(--green-dark);
  color: var(--white);
  border-color: var(--green-dark);
}

.btn-yt {
  background: var(--red-yt);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(200, 0, 0, 0.30);
}
.btn-yt:hover {
  background: var(--red-yt-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200, 0, 0, 0.40);
}

/* ============================================================
   PDF-LATAUKSET
   ============================================================ */
.pdf-list { display: flex; flex-direction: column; gap: 12px; }

.pdf-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--off-white);
  border-radius: 10px;
  padding: 14px 18px;
  flex-wrap: wrap;
}

.pdf-info { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 160px; }

.pdf-info h4 { font-weight: 800; font-size: 0.93rem; color: var(--text-dark); margin-bottom: 2px; }
.pdf-info p  { font-size: 0.82rem; color: var(--text-light); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--green-dark);
  color: rgba(255,255,255,0.85);
  padding: 40px 24px;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.footer-logo img { height: 38px; width: auto; opacity: 0.9; }

.footer-links { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.footer-links a {
  color: rgba(255,255,255,0.80);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--green-light); }

.footer-copy { font-size: 0.82rem; opacity: 0.5; }

/* ============================================================
   RESPONSIIVISUUS
   ============================================================ */
@media (max-width: 700px) {
  section { padding: 48px 0; }

  .nav-links {
    display: none;
    flex-direction: column;
  }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 52px; left: 0; right: 0;
    background: var(--green-dark);
    padding: 14px 20px;
    gap: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }
  .nav-toggle { display: block; }

  .visual-cards { grid-template-columns: 1fr; }

  .pdf-item { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-nav, .btn { display: none; }
}

/* --- VAU EFEKTIT JA SAAVUTETTAVUUS --- */
html {
  scroll-behavior: smooth;
}

.visual-card {
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease, border-color 0.3s ease;
}

.visual-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 24px 50px rgba(30, 100, 50, 0.18);
  border-color: rgba(76, 209, 55, 0.5);
}

.btn {
  transition: background 0.3s ease, transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.btn:hover {
  transform: translateY(-3px) scale(1.03);
}

.btn-primary:hover {
  box-shadow: 0 8px 25px rgba(27, 132, 60, 0.45);
}

.btn-secondary:hover {
  box-shadow: 0 8px 25px rgba(41, 182, 246, 0.45);
}

.btn-yt:hover {
  box-shadow: 0 8px 25px rgba(200, 0, 0, 0.45);
}

/* Saavutettavuus: Näkyvä fokus */
*:focus-visible {
  outline: 3px solid var(--blue-accent) !important;
  outline-offset: 4px;
  border-radius: 4px;
  box-shadow: 0 0 0 6px rgba(41, 182, 246, 0.3);
}

.btn:focus-visible, .nav-links a:focus-visible {
  border-radius: 10px;
}

/* AOS Animaatiot */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

.aos-init { opacity: 0; }
.aos-animate {
  animation: fadeInUp 0.7s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}