:root {
  --primary: #1f7a3f;
  --secondary: #f4a51c;
  --dark: #17311f;
  --light: #fffaf0;
  --muted: #65736a;
  --card: #ffffff;
  --border: #e8dfca;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--light);
  color: var(--dark);
  line-height: 1.6;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 250, 240, 0.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.navbar {
  max-width: 1180px;
  margin: auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--dark);
  text-decoration: none;
  font-weight: 700;
}

.brand img { width: 42px; height: 42px; object-fit: contain; }

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--dark);
  font-weight: 600;
  font-size: 14px;
}

.nav-links a:hover { color: var(--primary); }

.menu-toggle {
  display: none;
  border: none;
  background: var(--primary);
  color: white;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 20px;
}

.hero {
  max-width: 1180px;
  margin: auto;
  padding: 80px 20px 60px;
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 40px;
  align-items: center;
}

.badge, .eyebrow {
  display: inline-block;
  background: #fff0c8;
  color: #76500b;
  padding: 7px 12px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 13px;
}

.hero h1 {
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.08;
  margin: 18px 0;
}

.hero p { font-size: 18px; color: var(--muted); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.btn, button {
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.primary, button {
  background: var(--primary);
  color: white;
}

.secondary {
  background: white;
  color: var(--primary);
  border: 1px solid var(--border);
}

.hero-card {
  background: linear-gradient(160deg, #fff4cf, #ffffff);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 34px;
  text-align: center;
  box-shadow: 0 20px 50px rgba(31, 122, 63, 0.12);
}

.hero-card img {
  width: 220px;
  max-width: 100%;
  object-fit: contain;
}

.hero-card h2 { margin-bottom: 0; }

.intro, .page-section {
  max-width: 1180px;
  margin: auto;
  padding: 70px 20px;
}

.intro {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 30px;
}

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

.feature-grid article, .subject-card, .tips-grid article, .guide-grid article, .result-box, .quiz-box, .doc-list article, .note-list article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 22px;
  box-shadow: 0 10px 30px rgba(33, 49, 37, 0.06);
}

.feature-grid span { font-size: 30px; }

.alt {
  background: #fff3d8;
  max-width: none;
}

.alt > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-heading h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin: 12px 0 8px;
}

.section-heading p { color: var(--muted); }

.subject-card button { margin-top: 10px; }

.result-box, .quiz-box {
  margin-top: 22px;
}

.smart-form, .schedule-form, .doc-form, .rapel-form {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

.smart-form { grid-template-columns: 1fr 1fr auto; }
.schedule-form { grid-template-columns: 170px 1fr 1fr auto; }
.rapel-form { grid-template-columns: 1fr 1fr; }
.rapel-form textarea, .rapel-form button { grid-column: 1 / -1; }

input, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 13px 14px;
  font: inherit;
  background: white;
}

textarea { min-height: 110px; resize: vertical; }

.level-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.option-btn {
  display: block;
  width: 100%;
  margin: 8px 0;
  text-align: left;
  background: white;
  color: var(--dark);
  border: 1px solid var(--border);
}

.option-btn.correct { background: #dff5e7; border-color: #73c28d; }
.option-btn.wrong { background: #ffe3de; border-color: #f39b8c; }

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 18px;
  overflow: hidden;
}

th, td {
  padding: 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th { background: #f8e5b7; }

.delete-btn {
  background: #b53737;
  padding: 8px 12px;
}

.doc-list, .note-list {
  display: grid;
  gap: 14px;
}

.doc-list a { color: var(--primary); font-weight: 700; }

footer {
  text-align: center;
  padding: 30px 20px;
  background: var(--dark);
  color: white;
}

@media (max-width: 900px) {
  .hero, .intro { grid-template-columns: 1fr; }
  .feature-grid, .cards, .tips-grid, .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .smart-form, .schedule-form, .rapel-form { grid-template-columns: 1fr; }

  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 20px;
    right: 20px;
    flex-direction: column;
    align-items: flex-start;
    background: white;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px;
  }
  .nav-links.show { display: flex; }
}

@media (max-width: 560px) {
  .feature-grid, .cards, .tips-grid, .guide-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 44px; }
}

.subject-list { grid-template-columns: repeat(3, 1fr); }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.doc-list .delete-btn { margin-top: 12px; }
.note-list .delete-btn { margin-top: 10px; }
@media (max-width: 900px) { .guide-grid, .subject-list { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .guide-grid, .subject-list { grid-template-columns: 1fr; } }