/* ─── LAYOUT ─────────────────────────────────────────────────── */
.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 32px; }
section { padding: 96px 0; }
section:nth-child(even) { background: var(--off-white); }

/* ─── TYPOGRAPHY ─────────────────────────────────────────────── */
.label {
  font-size: 11px; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 12px; display: block;
}
h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 700; line-height: 1.1; letter-spacing: -.03em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 700; line-height: 1.2; letter-spacing: -.025em; }
h3 { font-size: 1.15rem; font-weight: 600; letter-spacing: -.01em; }
h4 { font-size: .95rem; font-weight: 600; }
p { color: var(--ink-3); line-height: 1.75; }
.mono { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-3); }

/* ─── SECTION HEADER ─────────────────────────────────────────── */
.section-header { margin-bottom: 56px; }
.section-header p { font-size: 1rem; max-width: 540px; margin-top: 10px; }

/* ─── BUTTONS ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .9rem; font-weight: 500;
  padding: 11px 22px; border-radius: var(--radius-md);
  transition: var(--transition); cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; border: none; }
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(45,91,227,.3);
}
.btn-outline { background: transparent; color: var(--ink-2); border: 1px solid var(--border); }
.btn-outline:hover { background: var(--surface); border-color: var(--ink-3); }

/* ─── NAVBAR ─────────────────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
  transition: var(--transition);
}
[data-theme="dark"] #navbar { background: rgba(10,10,11,.85); }
#navbar.scrolled { box-shadow: var(--shadow-sm); }
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav-logo {
  font-size: .95rem; font-weight: 600; letter-spacing: -.01em; color: var(--ink);
  display: flex; align-items: center; gap: 10px;
}
.nav-logo span.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  font-size: .85rem; font-weight: 500; color: var(--ink-3);
  padding: 6px 12px; border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--ink); background: var(--surface); }
.nav-links a.active { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
#theme-toggle {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-3); transition: var(--transition);
  background: transparent; border: 1px solid var(--border);
}
#theme-toggle:hover { background: var(--surface); color: var(--ink); }
.btn-nav {
  font-size: .83rem; font-weight: 500; padding: 7px 16px;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  color: var(--ink-2); transition: var(--transition); background: var(--white);
}
.btn-nav:hover { background: var(--surface); border-color: var(--ink-3); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: var(--transition); }

/* ─── MOBILE NAV DRAWER ──────────────────────────────────────── */
.mobile-nav {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0;
  background: var(--white); border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md); padding: 20px 24px 24px; z-index: 99;
  flex-direction: column; gap: 4px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: .95rem; font-weight: 500; color: var(--ink-2);
  padding: 10px 12px; border-radius: var(--radius-sm);
  transition: var(--transition);
}
.mobile-nav a:hover { background: var(--surface); color: var(--ink); }

/* ─── FOOTER ─────────────────────────────────────────────────── */
footer {
  background: var(--off-white); border-top: 1px solid var(--border);
  padding: 48px 0;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 20px;
}
.footer-left { display: flex; flex-direction: column; gap: 6px; }
.footer-left .name { font-weight: 600; font-size: .9rem; }
.footer-left .copy { font-size: .78rem; color: var(--ink-4); }
.footer-quote { font-size: .85rem; color: var(--ink-4); font-style: italic; text-align: center; max-width: 400px; }
.footer-socials { display: flex; gap: 8px; }
.footer-social {
  width: 34px; height: 34px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--white);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-3); transition: var(--transition);
}
.footer-social:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ─── READING PROGRESS BAR ───────────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: var(--accent); z-index: 200; transition: width .1s linear;
}

/* ─── BACK TO TOP ────────────────────────────────────────────── */
#back-to-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 99;
  width: 42px; height: 42px; border-radius: var(--radius-md);
  background: var(--white); border: 1px solid var(--border);
  box-shadow: var(--shadow-md); color: var(--ink-3);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition);
  opacity: 0; pointer-events: none;
}
#back-to-top.visible { opacity: 1; pointer-events: all; }
#back-to-top:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-2px); }

/* ─── SCROLL ANIMATIONS ──────────────────────────────────────── */
.fade-in { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  section { padding: 72px 0; }
  .container { padding: 0 20px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
}
@media (max-width: 600px) {
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.6rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-quote { text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  .fade-in { transition: none; opacity: 1; transform: none; }
  * { transition: none !important; }
}