/* Modern minimalist theme — mobile-first */
/* Variables */
:root {
  --bg: #fbfbfd;
  --card: #ffffff;
  --muted: #7b7f87;
  --text: #0f1724;
  --primary: #0b6df0;
  --primary-600: #085cd6;
  --accent: #6a8eeb;
  --shadow: 0 6px 18px rgba(12, 20, 36, 0.06);
  --glass: rgba(255, 255, 255, 0.6);
  --radius: 12px;
  --container: 1100px;
  --gap: 1rem;
  --border: #e6e9ef;
  --focus: 0 0 0 4px rgba(11, 109, 240, 0.12);
  --transition: 240ms cubic-bezier(.22, .9, .35, 1);
  font-size: 16px;
}

/* Reset / base */
* {
  box-sizing: border-box
}

html,
body {
  height: 100%
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, var(--bg), #f6f8fb 120px);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.45;
  padding-bottom: 4rem;
}

/* Layout container */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.7));
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(12, 20, 36, 0.02);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0;
}

.brand {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.logo rect {
  fill: var(--primary)
}

.brand-text .site-name {
  font-weight: 600;
  font-size: 1rem;
}

.brand-text .tagline {
  font-size: 0.78rem;
  color: var(--muted);
}

/* Navigation */
.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}

.nav-toggle:focus {
  outline: none;
  box-shadow: var(--focus);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.nav-list a {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.95rem;
}

.nav-list a:hover {
  color: var(--text);
  background: rgba(11, 109, 240, 0.04);
}

.nav-list a.active {
  color: var(--primary);
  background: rgba(11, 109, 240, 0.06);
}

/* Hero */
.main-content {
  padding: 1.6rem 0 2rem;
}

.hero {
  padding: 2rem 0 1rem;
  text-align: center;
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: 1.6rem;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 auto;
  max-width: 54ch;
  color: var(--muted);
  margin-top: 0.6rem;
}

.hero-cta {
  margin-top: 1rem;
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  gap: 0.55rem;
  align-items: center;
  padding: 0.75rem 1.1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: linear-gradient(180deg, var(--primary), var(--primary-600));
  color: white;
  box-shadow: 0 6px 18px rgba(11, 109, 240, 0.12);
}

.btn.ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid rgba(11, 109, 240, 0.08);
}

.btn.outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn.placeholder {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Cards grid */
.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  margin-top: 1.25rem;
  align-items: stretch;
}

.card {
  display: flex;
  gap: 1rem;
  flex-direction: column;
  padding: 1.05rem;
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 30px rgba(12, 20, 36, 0.08);
  border-color: rgba(11, 109, 240, 0.06);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card .card-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(180deg, var(--accent), #8fb1ff);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

/* Tools grid (teachers) */
.tools-grid {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.tool.card {
  padding: 1rem;
}

.tool-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.tool-mini {
  color: var(--muted);
  font-size: 0.85rem;
}

/* Panel (lesson planner) */
.panel {
  margin-top: 0.75rem;
  padding: 0.9rem;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(11, 109, 240, 0.02), rgba(250, 250, 255, 0.6));
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(12, 20, 36, 0.03);
  transform-origin: top;
  transition: opacity 260ms var(--transition), transform 260ms var(--transition), max-height 260ms ease;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
}

.panel[aria-hidden="false"] {
  max-height: 1000px;
  opacity: 1;
  transform: translateY(0);
}

/* Inputs & forms */
label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
  font-size: 0.95rem;
}

input:focus,
textarea:focus {
  outline: none;
  box-shadow: var(--focus);
  border-color: var(--primary);
}

/* panel actions */
.panel-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

/* sample output */
.sample-output {
  margin-top: 0.75rem;
  padding: 0.8rem;
  border-radius: 8px;
  background: rgba(12, 20, 36, 0.02);
  min-height: 3.2rem;
  transition: opacity var(--transition), transform var(--transition);
}

.sample-output .muted {
  color: var(--muted);
  margin: 0;
}

/* Contact form specifics */
.contact-form {
  max-width: 720px;
  margin-top: 0.75rem;
}

.form-row {
  margin-bottom: 0.6rem;
}

.form-hint {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.form-actions {
  margin-top: 0.6rem;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.form-message {
  margin-top: 0.6rem;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 240ms var(--transition), transform 240ms var(--transition);
}

.form-message.show {
  opacity: 1;
  transform: translateY(0);
}

/* utility text */
.muted {
  color: var(--muted);
}

.small {
  font-size: 0.9rem;
}

/* page cards */
.page-card {
  background: var(--card);
  padding: 1.2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  text-align: center;
}

/* Footer */
.site-footer {
  margin-top: 2.4rem;
  border-top: 1px solid var(--border);
  padding: 1.1rem 0;
  background: transparent;
}

.footer-inner {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  color: var(--muted);
}

.footer-links {
  list-style: none;
  display: flex;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
}

.footer-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Responsive */
@media (min-width:720px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .tools-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .header-inner {
    gap: 1.25rem;
  }

  .hero h1 {
    font-size: 1.9rem;
  }
}

@media (min-width:1100px) {
  .hero h1 {
    font-size: 2.25rem;
  }
}

/* Navigation collapse for small screens */
@media (max-width:860px) {
  .nav-list {
    position: absolute;
    right: 1rem;
    top: 64px;
    flex-direction: column;
    background: var(--card);
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 0.6rem;
    display: none;
    min-width: 200px;
  }

  .nav-list.show {
    display: flex;
  }
}

/* Redesign Additions */
.btn.large {
  font-size: 1.1rem;
  padding: 0.85rem 1.5rem;
}

/* Card Themes */
/* 1. Teachers: Teal/Green */
.card.theme-teacher {
  --accent: #00897b;
  --accent-light: rgba(0, 137, 123, 0.05);
  border-top: 4px solid var(--accent);
}

.card.theme-teacher .card-icon {
  background: linear-gradient(135deg, #00897b, #4db6ac);
}

/* 2. Students: Blue/Yellow */
.card.theme-student {
  --accent: #1565c0;
  /* Blue 800 */
  --accent-light: rgba(21, 101, 192, 0.05);
  border-top: 4px solid #fdd835;
  /* Yellow border top */
}

.card.theme-student .card-icon {
  background: linear-gradient(135deg, #1565c0, #42a5f5);
}

/* 3. Professionals: Navy/Slate */
.card.theme-professional {
  --accent: #37474f;
  --accent-light: rgba(55, 71, 79, 0.05);
  border-top: 4px solid var(--accent);
}

.card.theme-professional .card-icon {
  background: linear-gradient(135deg, #37474f, #607d8b);
}

/* Hover effects for all themed cards */
.card.theme-teacher:hover,
.card.theme-student:hover,
.card.theme-professional:hover {
  background: linear-gradient(180deg, var(--card), var(--accent-light));
}