:root {
  --bg: #0f172a;
  --card: #1e293b;
  --accent: #38bdf8;
  --text: #f8fafc;
  --dim: #94a3b8;
  --success: #22c55e;
  --danger: #ef4444;
  --border: #334155;
}

* { box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  margin: 0;
  min-height: 100vh;
  padding-top: 70px;
}

.container {
  max-width: 850px;
  margin: 0 auto;
  padding: .5rem;
}

/* Floating Navigation */
nav {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  width: calc(100% - 24px);
  max-width: 1100px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 14px;
  padding: 0.6rem 1rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255,255,255,0.04);
  overflow-x: auto;
}

.nav-inner {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: nowrap;
  justify-content: flex-start;
}

.nav-inner a {
  color: var(--dim);
  text-decoration: none;
  font-size: 0.8rem;
  white-space: nowrap;
  font-weight: 600;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s, transform 0.15s;
}

.nav-inner a:hover,
.nav-inner a.active {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.15);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: 0.8rem;
}

.logo-circle {
  width: 26px;
  height: 26px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-tri {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 11px solid var(--accent);
}

/* Header / Hero */
header {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.tagline {
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.9rem;
}

h1 {
  font-size: 2.1rem;
  margin: 0.5rem 0;
  letter-spacing: -0.02em;
}

.hero-quote {
  color: var(--dim);
  font-style: italic;
  margin: 0.5rem 0 1rem;
}

.essentials {
  display: flex;
  justify-content: center;
  gap: 1.8rem;
  flex-wrap: wrap;
  margin: 1.5rem 0;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  font-size: 0.85rem;
}

/* Buttons */
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform 0.15s, opacity 0.15s;
}

.btn:hover {
  transform: translateY(-2px);
  opacity: 0.92;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-secondary {
  border: 1px solid var(--dim);
  color: var(--text);
}

/* Study blocks */
.study-block {
  background: var(--card);
  padding: 1.8rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.study-block:hover {
  border-color: #475569;
}

.question-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
}

.green-text {
  color: var(--success);
  font-weight: 700;
  font-style: italic;
}

.red-text {
  color: var(--danger);
  font-weight: 700;
  font-style: italic;
}

.page-ref {
  color: var(--dim);
  font-size: 0.85rem;
  font-weight: 600;
}

.reflection-list {
  list-style: none;
  padding: 0;
}

.reflection-list li {
  margin-bottom: 1rem;
  padding-left: 1.2rem;
  border-left: 3px solid var(--accent);
}

.wisdom-quote {
  font-family: Georgia, serif;
  font-size: 1.05rem;
  color: var(--dim);
  border-left: 4px solid var(--success);
  padding-left: 1rem;
  margin: 1.2rem 0;
}

/* Cards & Grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.card {
  background: #0f172a;
  padding: 1.1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  transition: border-color 0.2s, transform 0.15s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.card a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.card a:hover {
  color: var(--accent);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

th {
  background: #0f172a;
  color: var(--accent);
  text-align: left;
  padding: 0.85rem;
  border-bottom: 2px solid var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

/* Navigation links at bottom */
.nav-links {
  display: flex;
  justify-content: space-between;
  margin: 2.5rem 0 1rem;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  transition: background 0.2s;
}

.nav-links a:hover {
  background: rgba(56, 189, 248, 0.1);
}

/* Symbol / Circle-Triangle */
.symbol {
  width: 110px;
  height: 110px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.circle {
  border: 3px solid var(--accent);
  border-radius: 50%;
  width: 100%;
  height: 100%;
}

.triangle {
  position: absolute;
  top: 18%;
  left: 12%;
  width: 0;
  height: 0;
  border-left: 44px solid transparent;
  border-right: 44px solid transparent;
  border-bottom: 76px solid var(--accent);
  opacity: 0.85;
}

.triangle-inner {
  position: absolute;
  top: 26%;
  left: 20%;
  width: 0;
  height: 0;
  border-left: 35px solid transparent;
  border-right: 35px solid transparent;
  border-bottom: 60px solid var(--bg);
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 0.8rem;
  margin-top: 3rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Headings */
h2 {
  color: var(--accent);
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
  margin-top: 0;
}

h3 {
  margin-top: 0;
  color: var(--text);
}

/* Responsive */
@media (max-width: 600px) {
  h1 { font-size: 1.55rem; }
  body { padding-top: 64px; }
  nav {
    top: 8px;
    width: calc(100% - 16px);
    padding: 0.5rem 0.7rem;
    border-radius: 12px;
  }
  .nav-inner { gap: 0.35rem; }
  .nav-inner a { font-size: 0.72rem; padding: 0.2rem 0.3rem; }
  .container { padding: 1rem; }
  .study-block { padding: 1.3rem; }
  .essentials { gap: 1rem; }
}