@font-face {
  font-family: "Buixots";
  src:
    url("font/Buixots.woff2") format("woff2"),
    url("font/Buixots.woff") format("woff"),
    url("font/Buixots.ttf") format("truetype");
  font-display: swap;
}

* {
  box-sizing: border-box;
}

:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --blue: #2563eb;
  --blue-soft: #dbeafe;
  --border: #d7e0eb;
  --shadow-card: 0 3px 0 rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 4px 0 rgba(37, 99, 235, 0.18);
  --red1: #d92f2f;
  --red2: #ef4444;
  --blue1: #1d4ed8;
  --blue2: #38bdf8;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.hidden {
  display: none !important;
}

.topbar {
  max-width: 1320px;
  margin: 0 auto;
  padding: 18px 22px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-title {
  font-family: "Buixots";
  text-decoration: none;
  color: var(--text);
  font-size: clamp(2.25rem, 6vw, 2.5rem);
  line-height: 1.1;
  text-transform: uppercase;
}

.lang-mini {
  border: 2px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 30px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.16s ease;
}

.lang-mini:hover {
  border-color: #93c5fd;
  background: #f8fbff;
}

.main {
  max-width: 1320px;
  margin: 0 auto;
  padding: 8px 22px 36px;
}

.hero {
  text-align: center;
  margin: 4px 0 26px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.06;
}

.hero p {
  max-width: 820px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.typing-card {
  width: 100%;
  border: 2px solid var(--border);
  background: var(--card);
  border-radius: 18px;
  padding: 20px 16px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 18px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    box-shadow 0.16s ease,
    background 0.16s ease;
  min-height: 320px;
}

.typing-card:hover {
  transform: translateY(-2px);
  border-color: #60a5fa;
  box-shadow: var(--shadow-hover);
  background: #fcfdff;
}

.card-icon {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 18px;
  flex-shrink: 0;
  display: block;
  margin-top: 4px;
}

.card-content {
  width: 100%;
  padding-top: 6px;
}

.card-content h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  line-height: 1.25;
  text-align: center;
}

.card-content p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
  text-align: center;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.58);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.popup {
  width: min(560px, 100%);
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 24px;
  padding: 26px;
  box-shadow: 0 5px 0 rgba(15, 23, 42, 0.12);
}

.popup h2 {
  margin: 0 0 10px;
  text-align: center;
  font-size: 1.55rem;
}

.popup p {
  margin: 0;
  text-align: center;
  color: var(--muted);
  line-height: 1.6;
}

.language-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.language-card {
  border: 2px solid rgba(255, 255, 255, 0.35);
  min-height: 160px;
  border-radius: 20px;
  color: #fff;
  padding: 22px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
  box-shadow: 0 4px 0 rgba(15, 23, 42, 0.14);
}

.language-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 0 rgba(15, 23, 42, 0.18);
}

.language-card strong {
  display: block;
  font-size: 1.24rem;
  margin-bottom: 8px;
}

.language-card span {
  display: block;
  font-size: 0.96rem;
  line-height: 1.5;
  opacity: 0.98;
}

.language-card.blue {
  background: linear-gradient(135deg, var(--blue1), var(--blue2));
}

.language-card.red {
  background: linear-gradient(135deg, var(--red1), var(--red2));
}

.popup-top {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 4px;
}

.close-btn {
  border: 2px solid var(--border);
  width: 38px;
  height: 38px;
  border-radius: 999px;
  background: #eef2f7;
  font-size: 18px;
  cursor: pointer;
}

.grade-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}

.grade-btn {
  border: 2px solid var(--border);
  background: #f8fafc;
  color: var(--text);
  padding: 10px 10px;
  border-radius: 12px;
  font-size: 0.96rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
}

.grade-btn:hover {
  border-color: #60a5fa;
  background: var(--blue-soft);
  color: #0f172a;
}

.switch-link {
  display: block;
  margin: 18px auto 0;
  border: 0;
  background: transparent;
  color: var(--blue);
  font-size: 0.95rem;
  cursor: pointer;
}

.footer {
  padding: 10px 20px 26px;
  text-align: center;
}

.footer p {
  margin: 0;
  color: #90a0b4;
  font-size: 0.88rem;
}

@media (max-width: 1100px) {
  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .topbar {
    padding: 14px 14px 4px;
  }

  .brand-title {
    font-size: 1.8rem;
  }

  .main {
    padding: 4px 14px 28px;
  }

  .cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .typing-card {
    min-height: 286px;
    padding: 18px 12px 12px;
    gap: 16px;
  }

  .card-icon {
    width: 84px;
    height: 84px;
  }

  .card-content {
    padding-top: 2px;
  }

  .card-content h3 {
    font-size: 0.98rem;
  }

  .card-content p {
    font-size: 0.87rem;
    line-height: 1.45;
  }

  .language-options {
    grid-template-columns: 1fr;
  }

  .grade-list {
    grid-template-columns: 1fr;
  }
}