/* Glassroom Landing Page — style.css */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue: #2D6CB4;
  --blue-light: #4A90D9;
  --blue-dark: #1e4d84;
  --text: #1a1a2e;
  --text-secondary: #4a4a5a;
  --text-muted: #7a7a8a;
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --bg-dark: #1a1a2e;
  --border: #e4e4e8;
  --green: #3DAA6D;
  --amber: #E8A838;
  --red: #D94452;
  --radius: 8px;
  --max-width: 1040px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

section.alt {
  background: var(--bg-alt);
}

section.dark {
  background: var(--bg-dark);
  color: #fff;
}

/* ── Nav ── */

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-logo {
  width: 24px;
  height: 24px;
  display: block;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

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

/* ── Buttons ── */

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
}

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

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--blue-dark);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

/* ── Hero ── */

#hero {
  background: var(--bg-dark);
  color: #fff;
  padding: 6rem 0 6rem;
  text-align: center;
}

#hero .hero-logo {
  display: block;
  margin: 0 auto 1rem;
  width: 144px;
  height: 144px;
}

#hero .eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-light);
  margin-bottom: 1.25rem;
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  max-width: 760px;
  margin: 0 auto 1.5rem;
}

#hero h1 em {
  font-style: normal;
  color: var(--blue-light);
}

#hero .subhead {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(255, 255, 255, 0.72);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-byline {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

.hero-byline a {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* ── Dashboard mockup ── */

#mockup {
  background: var(--bg-alt);
  padding: 3rem 0 4rem;
}

.mockup-frame {
  max-width: 860px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.1);
}

.mockup-bar {
  background: var(--bg-dark);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
}

.mockup-url {
  flex: 1;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  height: 22px;
  margin: 0 0.75rem;
}

.mockup-body {
  padding: 1.5rem;
}

.mockup-nav-bar {
  background: var(--bg-dark);
  border-radius: 6px;
  height: 36px;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: 1rem;
}

.mockup-nav-pill {
  height: 10px;
  border-radius: 5px;
  background: rgba(255,255,255,0.15);
}

.mockup-class-block {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.mockup-class-header {
  background: var(--bg-alt);
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mockup-class-name {
  width: 120px;
  height: 10px;
  border-radius: 5px;
  background: #ccc;
}

.mockup-badge {
  height: 20px;
  width: 48px;
  border-radius: 10px;
}

.mockup-row {
  display: flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border-top: 1px solid var(--border);
  gap: 0.75rem;
}

.mockup-title {
  flex: 1;
  height: 9px;
  border-radius: 4px;
  background: #ddd;
}

.mockup-meta {
  width: 60px;
  height: 9px;
  border-radius: 4px;
  background: #e8e8e8;
}

.mockup-status {
  width: 70px;
  height: 20px;
  border-radius: 10px;
}

/* Status badge colors */
.badge-red    { background: #fde8ea; }
.badge-amber  { background: #fdf3e0; }
.badge-green  { background: #e0f5ec; }
.badge-blue   { background: #e0eefa; }

/* ── Problem section ── */

#problem h2,
#what-it-does h2,
#who h2,
#install h2,
#open-source h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

#problem .section-subhead,
#what-it-does .section-subhead,
#who .section-subhead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 3rem;
  line-height: 1.6;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.problem-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.problem-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.problem-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.problem-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}



/* ── What it does ── */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  padding: 1.5rem;
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Who it's for ── */

.who-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.who-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.who-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.who-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ── Install ── */

#install {
  background: var(--bg-dark);
  color: #fff;
}

#install h2 {
  color: #fff;
  margin-bottom: 0.75rem;
}

#install .section-subhead {
  color: rgba(255,255,255,0.65);
  margin-bottom: 2.75rem;
  font-size: 1rem;
  line-height: 1.6;
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.install-step {
  position: relative;
}

.step-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--blue-light);
  line-height: 1;
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.install-step h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: #fff;
}

.install-step p {
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.55;
}

.install-step a {
  color: var(--blue-light);
}

.terminal-block {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  max-width: 560px;
}

.terminal-block pre {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
  font-size: 0.88rem;
  color: rgba(255,255,255,0.9);
  line-height: 1.7;
  white-space: pre-wrap;
}

.terminal-block pre .prompt {
  color: var(--blue-light);
  user-select: none;
}

.terminal-block pre .comment {
  color: rgba(255,255,255,0.35);
}

/* ── Open source ── */

#open-source {
  text-align: center;
}

#open-source h2 {
  margin-bottom: 1rem;
}

#open-source p {
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 2rem;
  font-size: 1rem;
  line-height: 1.65;
}

.oss-badges {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.oss-badge {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  text-decoration: none;
}

/* ── Footer ── */

footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
}

footer p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.65;
}

footer a {
  color: var(--text-secondary);
}

/* ── Mobile ── */

@media (max-width: 640px) {
  section {
    padding: 3.5rem 0;
  }

  #hero {
    padding: 4.5rem 0 4rem;
  }

  nav {
    padding: 0.75rem 1.25rem;
  }

  .nav-links {
    display: none;
  }

  .container {
    padding: 0 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .install-steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 400px) {
  .install-steps {
    grid-template-columns: 1fr;
  }
}