:root {
  --text: #0f172a;
  --muted: #5b6475;
  --border: #e6e8ee;

  --accent: #163a9a;
  /* richer editorial blue */
  --accent-soft: #e9efff;
  --brand-accent: #7c95d9;

  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f6f7fb;

  --radius: 14px;
}


* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 10% 0%, #f2f5ff 0%, transparent 55%),
    radial-gradient(900px 500px at 90% 10%, #f7f8ff 0%, transparent 55%),
    var(--bg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

/* Layout */
.container {
  max-width: 980px;
  margin: 0 auto;
}

/* Page spacing */
.page {
  padding: 54px 18px 76px;
  /* top, left/right, bottom */
}

/* Extra breathing room on larger screens */
@media (min-width: 1024px) {
  .page {
    padding-left: 32px;
    padding-right: 32px;
  }
}

/* Header / footer */
@media (min-width: 1024px) {

  .site-header,
  .site-footer {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding-left: 18px;
  padding-right: 18px;
}

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-left: 18px;
  padding-right: 18px;
}

.header-row,
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}

/* Wordmark */
/* Wordmark container */
.brand {
  font-size: 1.15rem;
  font-weight: 650;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--text);
}

/* "alan" */
.brand-mark {
  letter-spacing: 0.02em;
}

/* separator dot */
.brand-sep {
  margin: 0 3px;
  color: #9aa3b2;
  /* medium cool gray */
  font-weight: 400;
  opacity: 55;
  transform: translateY(0.5px);
  /* tiny visual center */
}

/* "thinks.ai" */
.brand-dot {
  color: var(--brand-accent);
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* Nav */
.nav a,
.footer-nav a {
  text-decoration: none;
  color: var(--muted);
  margin-left: 14px;
  font-weight: 500;
}

.nav a:hover,
.footer-nav a:hover {
  color: var(--accent);
}

/* Headings */
h1 {
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1.15;
  margin: 0 0 10px;
}

h2 {
  font-size: clamp(20px, 2.2vw, 24px);
  margin-top: 32px;
}

p,
li {
  color: var(--muted);
}

/* Hero band */
.hero {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: clamp(22px, 3vw, 34px);
  box-shadow: var(--shadow-sm);
}

.hero p {
  max-width: 64ch;
}

/* Buttons */
.hero-cta {
  display: flex;
  gap: 10px;
  margin: 18px 0 8px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* Paper / essay cards */
.paper-card {
  margin: 18px 0;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.paper-card+.paper-card {
  margin-top: 12px;
  /* slightly tighter between sequential cards */
}

.paper-card h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

.paper-card p {
  margin: 0 0 4px;
}

.paper-card .quiet-note {
  font-size: 0.9rem;
}

/* Inputs */
input,
select,
textarea {
  width: min(560px, 100%);
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--surface);
  color: var(--text);
}

input::placeholder {
  color: #9aa3b2;
}

textarea {
  resize: vertical;
}

label {
  display: inline-block;
  margin-bottom: 6px;
  color: var(--text);
}

input:disabled,
select:disabled,
textarea:disabled {
  background: #f3f4f8;
  color: #8b93a3;
}

/* Lists */
ul {
  padding-left: 1.1rem;
}

li {
  margin: 6px 0;
}

/* Dividers */
hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 36px 0;
}

/* Small notes */
.quiet-note {
  font-size: .98rem;
  color: var(--muted);
}

/* Mobile */
@media (max-width:720px) {
  .header-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav a {
    margin-left: 0;
    margin-right: 12px;
  }
}