@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&display=swap');

:root {
  --bg: #020617;
  --bg2: #0f172a;
  --bg3: #1e293b;
  --cyan: #06b6d4;
  --cyan-dim: rgba(6,182,212,0.15);
  --green: #a3e635;
  --purple: #d946ef;
  --txt: #ffffff;
  --txt2: #94a3b8;
  --txt3: #64748b;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(6,182,212,0.3);
  --grid: rgba(255,255,255,0.03);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--txt);
  background: var(--bg);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 50px 50px;
  min-height: 100vh;
}

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(2,6,23,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px; height: 60px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-family: 'Inter', sans-serif; font-weight: 900; font-size: 15px;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--txt); text-decoration: none;
}

.nav-logo span { color: var(--cyan); }

.page { width: min(960px, calc(100% - 32px)); margin: 0 auto; padding: 100px 0 80px; }
.narrow { width: min(520px, calc(100% - 32px)); margin: 0 auto; padding: 100px 0 80px; }
.hero { padding: 60px 0; }

.eyebrow {
  font-family: 'Courier New', monospace; color: var(--cyan);
  font-weight: 600; text-transform: uppercase; font-size: 12px;
  letter-spacing: 0.18em; margin-bottom: 20px;
}

h1 { font-size: clamp(36px, 5vw, 56px); font-weight: 900; line-height: 1.05; margin-bottom: 20px; color: var(--txt); }
h1 span { color: var(--cyan); }
h2 { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--txt); letter-spacing: 0.02em; }
p { line-height: 1.6; color: var(--txt2); }

.panel {
  background: rgba(15,23,42,0.8); border: 1px solid var(--border);
  border-radius: 2px; padding: 28px 32px; margin: 20px 0;
  backdrop-filter: blur(8px);
}
.panel:hover { border-color: var(--border2); }

form { display: grid; gap: 14px; }

input {
  width: 100%; padding: 13px 16px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 2px; color: var(--txt); font-family: 'Inter', sans-serif;
  font-size: 15px; transition: border-color 0.2s; outline: none;
}
input::placeholder { color: var(--txt3); }
input:focus { border-color: var(--cyan); background: rgba(6,182,212,0.05); }

button, .button {
  display: inline-flex; align-items: center; justify-content: center;
  width: fit-content; border: 0; border-radius: 0; padding: 13px 28px;
  background: var(--cyan); color: #000; text-decoration: none;
  font-family: 'Inter', sans-serif; font-weight: 700; font-size: 13px;
  letter-spacing: 0.12em; text-transform: uppercase; cursor: pointer;
  transition: background 0.2s, color 0.2s; white-space: nowrap;
}
button:hover, .button:hover { background: #fff; color: #000; }

.secondary, .button.secondary { background: transparent; color: var(--txt); border: 1px solid var(--border); }
.secondary:hover, .button.secondary:hover { border-color: var(--cyan); color: var(--cyan); background: transparent; }

.course-card {
  background: rgba(15,23,42,0.6); border: 1px solid var(--border);
  border-radius: 2px; padding: 24px 28px; margin: 16px 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; transition: border-color 0.2s;
}
.course-card:hover { border-color: var(--cyan); }
.course-card h2 { margin: 0 0 6px; font-size: 17px; }
.course-card p { margin: 0; color: var(--txt2); font-size: 14px; }

.header-bar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 40px; padding-bottom: 24px; border-bottom: 1px solid var(--border);
}

#status { font-family: 'Courier New', monospace; color: var(--cyan); font-size: 13px; letter-spacing: 0.05em; margin: 0; }
#status::before { content: '// '; }

.actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 32px; align-items: center; }
.hidden { display: none; }

code { background: rgba(6,182,212,0.1); color: var(--cyan); padding: 2px 7px; border-radius: 2px; font-size: 0.88em; }

.accent-line { width: 40px; height: 3px; background: var(--cyan); margin-bottom: 24px; }

#message { font-family: 'Courier New', monospace; font-size: 13px; padding: 12px 16px; border-radius: 2px; margin-top: 12px; }
#message:not(:empty) { background: rgba(217,70,239,0.1); border: 1px solid rgba(217,70,239,0.3); color: #d946ef; }

@media (max-width: 700px) {
  h1 { font-size: 32px; }
  button, .button { width: 100%; justify-content: center; }
  .course-card { flex-direction: column; align-items: flex-start; }
  .nav { padding: 0 16px; }
}