/* ============================================================
   J1Codecrafters — shared stylesheet
   Palette:
     navy        #16233f  (page background / dark sections)
     navy-deep   #1b2a4a  (cards, alternate sections)
     near-black  #0b0f17  (header, footer, hero depth)
     ink         #e8edf6  (primary text)
     muted       #9fb0cc  (secondary text)
     accent      #f5b301  (gold — CTAs, wordmark, highlights)
     success     #1d9e75  (green — pass / confirmation)
   ============================================================ */

:root {
  --navy: #16233f;
  --navy-deep: #1b2a4a;
  --near-black: #0b0f17;
  --ink: #e8edf6;
  --muted: #9fb0cc;
  --accent: #f5b301;
  --success: #1d9e75;
  --border: rgba(159, 176, 204, 0.18);
  --radius: 10px;
  --font-heading: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--navy);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.2;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); font-weight: 600; }
h3 { font-size: 1.2rem; font-weight: 600; }

p { margin: 0 0 1em; }

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

img { max-width: 100%; height: auto; }

/* ---------- Layout helpers ---------- */

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4.5rem 0;
}

.section--deep { background: var(--navy-deep); }
.section--dark { background: var(--near-black); }

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 44em;
}

/* ---------- Wordmark ---------- */

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none !important;
}

.wordmark__code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--accent); /* brackets and slash — gold frames the white J1 */
  letter-spacing: 0.02em;
}

.wordmark__j1 { color: var(--ink); }

.wordmark__name {
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--ink);
  text-transform: uppercase;
}

/* ---------- Header / nav ---------- */

.site-header {
  background: var(--near-black);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  max-width: 1080px;
  margin: 0 auto;
}

.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

/* Mobile nav toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--ink);
  font-size: 1.3rem;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--near-black);
    border-bottom: 1px solid var(--border);
  }

  .site-nav.is-open { display: block; }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
  }

  .site-nav a {
    display: block;
    padding: 0.85rem 1.5rem;
  }

  .site-nav a[aria-current="page"] {
    border-bottom: none;
    border-left: 3px solid var(--accent);
    padding-left: calc(1.5rem - 3px);
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.8rem 1.7rem;
  border-radius: var(--radius);
  text-decoration: none !important;
  transition: transform 0.12s ease, opacity 0.12s ease;
}

.btn:hover { transform: translateY(-1px); }

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

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

.btn--secondary:hover { border-color: var(--muted); }

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--near-black) 0%, var(--navy) 100%);
  padding: 6rem 0 5rem;
}

.hero h1 { max-width: 18em; }

.hero .lead { margin-bottom: 2rem; }

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ---------- Cards / grids ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--navy-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.section--deep .card { background: var(--navy); }

.card h3 { color: var(--ink); }
.card p { color: var(--muted); margin-bottom: 0; }

.card__icon {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* ---------- Problem list ---------- */

.defect-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: grid;
  gap: 1rem;
  max-width: 46em;
}

.defect-list li {
  padding: 1rem 1.25rem;
  background: var(--navy-deep);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted);
}

.defect-list li strong { color: var(--ink); }

/* ---------- Credibility strip ---------- */

.cred-strip {
  text-align: center;
  padding: 2.75rem 1.5rem;
  background: var(--near-black);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cred-strip p {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--ink);
}

.cred-strip .cred-strip__mark { color: var(--success); margin-right: 0.5rem; }

/* ---------- CTA band ---------- */

.cta-band { text-align: center; }
.cta-band .lead { margin-left: auto; margin-right: auto; }
.cta-band .btn { margin-top: 1rem; }

/* ---------- Product page ---------- */

.principle {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  background: var(--near-black);
  margin-top: 2rem;
}

.principle blockquote {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink);
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
}

.check-list li {
  color: var(--muted);
  padding-left: 1.6rem;
  position: relative;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

/* ---------- Demo page video placeholders ---------- */

.video-grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.video-slot { max-width: 760px; }

.video-slot__frame {
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(ellipse at center, rgba(245, 179, 1, 0.06) 0%, transparent 65%),
    var(--near-black);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.75rem;
}

.video-slot__play {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-slot__play::after {
  content: "";
  display: block;
  margin-left: 5px;
  border-left: 18px solid var(--accent);
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
}

.video-slot__coming {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}

.video-slot figcaption {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.video-slot figcaption strong { color: var(--ink); }

/* ---------- Contact form ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  margin-top: 2rem;
}

@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-form label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  background: var(--near-black);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem 0.9rem;
  margin-bottom: 1.25rem;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

.contact-form textarea { min-height: 150px; resize: vertical; }

.contact-aside {
  color: var(--muted);
}

.contact-aside h3 { color: var(--ink); }

.privacy-note {
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: 1.5rem;
}

/* Inline form submit result (hidden until main.js sets a state class) */
.form-status {
  display: none;
  margin: 1rem 0 0;
  font-size: 0.95rem;
}

.form-status--success { display: block; color: var(--success); }
.form-status--error { display: block; color: var(--accent); }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--near-black);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 0;
}

.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}