/* ====== Fonts & Base ====== */
@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;600&family=Inter:wght@400;600&display=swap');

:root {
  --pink: #f7b7d2;
  --lavender: #cdb4db;
  --mint: #bde0c8;
  --sky: #a2d2ff;
  --peach: #ffd6a5;
  --yellow: #fff1a8;

  --text-dark: #3a3a3a;
  --text-light: #666;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, var(--lavender), var(--sky));
  color: var(--text-dark);
  min-height: 100vh;
}

/* ====== Header ====== */
.header {
  background: linear-gradient(90deg, var(--pink), var(--peach));
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  background: var(--white);
  color: var(--pink);
  font-family: 'Fredoka', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header h1 {
  font-family: 'Fredoka', sans-serif;
  font-size: 1.8rem;
  margin: 0;
}

.header a {
  text-decoration: none;
  font-weight: 600;
  background: var(--white);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  color: var(--text-dark);
}

/* ====== Layout ====== */
.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
}

/* ====== Cards ====== */
.card {
  background: var(--white);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  margin-bottom: 2rem;
}

/* ====== Typography ====== */
h1, h2 {
  font-family: 'Fredoka', sans-serif;
  font-size: 2rem;
  margin-top: 0;
}

p {
  font-size: 1.1rem;
  line-height: 1.6;
}

.meta {
  font-size: 1rem;
  color: var(--text-light);
}

.hint {
  background: var(--yellow);
  padding: 1rem;
  border-radius: 12px;
  font-weight: 600;
}

/* ====== Forms ====== */
label {
  display: block;
  margin-top: 1rem;
  font-weight: 600;
}

.input {
  width: 100%;
  padding: 0.7rem;
  border-radius: 10px;
  border: 2px solid var(--lavender);
  font-size: 1.1rem;
  margin-top: 0.3rem;
}

/* ====== Buttons ====== */
.btn {
  display: inline-block;
  margin-top: 1.5rem;
  background: linear-gradient(90deg, var(--mint), var(--sky));
  color: var(--text-dark);
  border: none;
  padding: 0.7rem 1.4rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.btn.ghost {
  background: var(--white);
  border: 2px dashed var(--pink);
}

.btn.small {
  font-size: 0.9rem;
  padding: 0.3rem 0.8rem;
  margin-left: 0.5rem;
}

/* ====== Grades ====== */
.grade-list {
  list-style: none;
  padding: 0;
}

.grade-list li {
  background: var(--peach);
  margin-bottom: 0.7rem;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ====== Error / Challenge Pages ====== */
.error-card {
  border-left: 8px solid var(--pink);
}

.challenge {
  background: var(--mint);
  padding: 1rem;
  border-radius: 12px;
  margin-top: 1rem;
  font-weight: 600;
}

/* ====== Footer ====== */
.footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: var(--text-light);
}