/* deeptide.sh
 * Visual reference: starship.rs, mise.jdx.dev, atuin.sh, charm.sh.
 * Brand palette derives from logo.svg gradients (tide cyan→teal→emerald,
 * deep navy whale tones).  No framework — system fonts, hand-tuned CSS.
 */

:root {
  --bg:           #0a0f1c;
  --bg-elev:     #0f172a;
  --bg-elev-2:   #1e293b;
  --border:      #1e293b;
  --border-soft: #14213b;
  --text:        #e2e8f0;
  --text-dim:    #94a3b8;
  --text-muted:  #64748b;

  --tide-1:   #0ea5e9;
  --tide-2:   #06b6d4;
  --tide-3:   #10b981;
  --tide-soft:#7dd3fc;

  --grad-tide: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #10b981 100%);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text",
               "Inter", "Segoe UI", Roboto, "Helvetica Neue",
               Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --radius:    10px;
  --radius-sm: 6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  /* Subtle radial accent, far below content — feels like deep water. */
  background:
    radial-gradient(ellipse 1100px 600px at 50% -10%,
                    rgba(14, 165, 233, 0.10) 0%,
                    transparent 60%),
    radial-gradient(ellipse 800px 400px at 80% 20%,
                    rgba(16, 185, 129, 0.06) 0%,
                    transparent 60%),
    var(--bg);
}

a {
  color: var(--tide-soft);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--tide-2); }

::selection {
  background: rgba(14, 165, 233, 0.35);
  color: #fff;
}

/* ─── Top nav ────────────────────────────────────────────────────────── */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 24px 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.nav-brand img { width: 32px; height: 32px; }

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--text-dim);
}
.nav-links a { color: var(--text-dim); }
.nav-links a:hover { color: var(--text); }

.nav-github {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ─── Hero ───────────────────────────────────────────────────────────── */

.hero {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 80px 24px 60px;
}

.hero img.logo {
  width: 144px;
  height: 144px;
  margin: 0 auto 24px;
  display: block;
  filter: drop-shadow(0 12px 36px rgba(14, 165, 233, 0.18));
}

.hero h1 {
  font-size: 56px;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 12px;
  font-weight: 600;
  background: var(--grad-tide);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.hero .tagline {
  font-size: 19px;
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.5;
}

.hero .tagline strong {
  color: var(--text);
  font-weight: 500;
}

/* ─── Install command card ──────────────────────────────────────────── */

.install {
  margin: 0 auto;
  max-width: 640px;
  padding: 0 24px;
}

.install-row {
  display: flex;
  align-items: stretch;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 14px;
  overflow: hidden;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.02) inset,
    0 8px 24px rgba(0, 0, 0, 0.25);
}

.install-prompt {
  padding: 14px 16px;
  color: var(--tide-2);
  font-weight: 600;
  user-select: none;
  display: flex;
  align-items: center;
}

.install-cmd {
  flex: 1;
  padding: 14px 12px 14px 4px;
  color: var(--text);
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: thin;
}

.install-copy {
  padding: 0 16px;
  background: transparent;
  border: 0;
  border-left: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  font: inherit;
  transition: color 0.15s ease, background 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}
.install-copy:hover { color: var(--text); background: var(--bg-elev-2); }
.install-copy.copied { color: var(--tide-3); }

.install-note {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}
.install-note a { color: var(--text-dim); border-bottom: 1px dashed var(--border); }
.install-note a:hover { color: var(--text); }

/* ─── Demo terminal ─────────────────────────────────────────────────── */

.demo {
  max-width: 820px;
  margin: 60px auto;
  padding: 0 24px;
}

.terminal {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
}
.terminal-dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.terminal-dot.r { background: #ff5f56; }
.terminal-dot.y { background: #ffbd2e; }
.terminal-dot.g { background: #27c93f; }
.terminal-title {
  margin-left: 12px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.terminal pre {
  margin: 0;
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text);
  overflow-x: auto;
  white-space: pre;
}

/* Color tokens used inside the terminal demo. */
.tk-prompt { color: var(--tide-2); }
.tk-section{ color: var(--text); font-weight: 600; }
.tk-key    { color: var(--text-muted); }
.tk-ok     { color: #34d399; }
.tk-warn   { color: #fbbf24; }
.tk-cmd    { color: var(--tide-soft); }
.tk-dim    { color: var(--text-muted); }

/* ─── Feature grid ──────────────────────────────────────────────────── */

.features {
  max-width: 980px;
  margin: 60px auto 40px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.feature:hover {
  border-color: var(--border-soft);
  transform: translateY(-1px);
}
.feature h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.feature .feature-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--tide-2);
}
.feature p {
  margin: 0;
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.55;
}
.feature code {
  background: rgba(14, 165, 233, 0.08);
  color: var(--tide-soft);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ─── Alt install methods ───────────────────────────────────────────── */

.alt-install {
  max-width: 780px;
  margin: 60px auto 0;
  padding: 0 24px;
}

.alt-install h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--text);
}

.alt-install .alt-block {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 14px;
}
.alt-install .alt-block h4 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.alt-install .alt-block .desc {
  margin: 0 0 10px;
  font-size: 13.5px;
  color: var(--text-dim);
}
.alt-install pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  overflow-x: auto;
}

/* ─── Footer ────────────────────────────────────────────────────────── */

footer {
  max-width: 980px;
  margin: 80px auto 28px;
  padding: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}
footer .built-by {
  letter-spacing: 0.01em;
}
footer .footer-links {
  display: flex;
  gap: 18px;
}
footer .footer-links a { color: var(--text-dim); }
footer .footer-links a:hover { color: var(--text); }

/* ─── Mobile ────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .hero { padding: 56px 20px 40px; }
  .hero h1 { font-size: 40px; }
  .hero .tagline { font-size: 17px; }
  .hero img.logo { width: 112px; height: 112px; }
  .nav-links { display: none; }
  .nav-github { display: inline-flex; }
  .install-cmd { font-size: 13px; }
  .terminal pre { font-size: 12px; padding: 14px 16px; }
  .features { gap: 12px; margin-top: 40px; }
  footer { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; }
}