/* ==========================================================================
   SIP Train — Marketing Site Stylesheet
   Brand spec: PROJECT-CONTEXT.md §4 / siptrain-brand-guide.html
   ========================================================================== */

/* ---- Tokens ------------------------------------------------------------- */
:root {
  --track-blue:    #0B2D5B;   /* Primary brand colour */
  --midnight:      #061A36;   /* Dark backgrounds */
  --signal-amber:  #E8920A;   /* Accent — always amber on "SIP" */
  --signal-steel:  #4A5D75;   /* Secondary text */
  --platform-mist: #DEEAF7;   /* Light backgrounds, table highlights */
  --smoke:         #F4F7FB;   /* Page backgrounds */
  --white:         #FFFFFF;
  --rail-grey:     #C8D3E2;
  --code-bg:       #F0F4FA;
  --success:       #1F7A4D;
  --error:         #B62828;

  --font-display: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', 'Consolas', 'Monaco', monospace;

  --max-w:        1180px;
  --max-w-prose:  720px;
  --radius:       6px;
  --shadow-sm:    0 1px 2px rgba(11, 45, 91, 0.06);
  --shadow-md:    0 4px 14px rgba(11, 45, 91, 0.08);
  --shadow-lg:    0 14px 38px rgba(11, 45, 91, 0.12);
}

/* ---- Reset / base ------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--track-blue);
  background: var(--smoke);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--track-blue); text-decoration: underline; text-decoration-color: var(--rail-grey); text-underline-offset: 3px; }
a:hover { color: var(--signal-amber); text-decoration-color: var(--signal-amber); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  color: var(--track-blue);
  margin: 0 0 0.6em;
}
h1 { font-size: clamp(2rem, 4vw + 0.5rem, 3.4rem); letter-spacing: -0.02em; font-weight: 900; }
h2 { font-size: clamp(1.5rem, 2vw + 0.7rem, 2.1rem); letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; color: var(--signal-steel); text-transform: uppercase; letter-spacing: 0.06em; }
p  { margin: 0 0 1.1em; }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.92em;
}
code {
  background: var(--code-bg);
  padding: 0.12em 0.36em;
  border-radius: 3px;
  color: var(--midnight);
}
pre {
  background: var(--midnight);
  color: #E6EDF7;
  padding: 1em 1.2em;
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.55;
}
pre code { background: transparent; padding: 0; color: inherit; }

/* ---- Layout helpers ----------------------------------------------------- */
.wrap     { max-width: var(--max-w);       margin: 0 auto; padding: 0 1.5rem; }
.wrap-prose { max-width: var(--max-w-prose); margin: 0 auto; padding: 0 1.5rem; }
.section  { padding: 4.5rem 0; }
.section--dark { background: var(--midnight); color: #DDE5F0; }
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--white); }
.section--mist { background: var(--platform-mist); }
.section--smoke { background: var(--smoke); }
.eyebrow {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-amber);
  margin: 0 0 0.6em;
}

/* ---- Header / Nav ------------------------------------------------------- */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--rail-grey);
  position: sticky; top: 0; z-index: 50;
  box-shadow: var(--shadow-sm);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.5rem;
  max-width: var(--max-w); margin: 0 auto;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.65rem;
  text-decoration: none; color: var(--track-blue);
  font-family: var(--font-display); font-weight: 900;
  font-size: 1.45rem; letter-spacing: -0.03em;
}
.brand:hover { color: var(--track-blue); }
.brand .sip   { color: var(--signal-amber); }
.brand .train { color: var(--track-blue); }
.brand__rails { display: block; }

.site-nav { display: flex; align-items: center; gap: 1.6rem; }
.site-nav a {
  font-family: var(--font-body); font-weight: 500; font-size: 0.95rem;
  text-decoration: none; color: var(--track-blue);
}
.site-nav a:hover { color: var(--signal-amber); }
.site-nav a.is-active { color: var(--signal-amber); }

.site-nav__cta {
  font-family: var(--font-display); font-weight: 700;
  background: var(--signal-amber); color: var(--white);
  padding: 0.55rem 1.05rem; border-radius: var(--radius);
}
.site-nav__cta:hover { background: var(--track-blue); color: var(--white); }

.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer;
  padding: 0.4rem; color: var(--track-blue);
}
.nav-toggle svg { width: 28px; height: 28px; }

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 100%; right: 1rem; left: 1rem;
    background: var(--white); border: 1px solid var(--rail-grey); border-radius: var(--radius);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 0.5rem 0; box-shadow: var(--shadow-md);
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 0.85rem 1.2rem; border-bottom: 1px solid var(--rail-grey); }
  .site-nav a:last-child { border-bottom: 0; }
  .site-nav__cta { margin: 0.5rem 1rem; text-align: center; border-radius: var(--radius); }
}

/* ---- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-block;
  font-family: var(--font-display); font-weight: 700;
  text-decoration: none;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  transition: transform 0.12s ease, background 0.15s ease, color 0.15s ease;
  cursor: pointer; font-size: 0.98rem;
  letter-spacing: 0.01em;
}
.btn--primary {
  background: var(--signal-amber); color: var(--white);
  border-color: var(--signal-amber);
}
.btn--primary:hover { background: var(--track-blue); border-color: var(--track-blue); color: var(--white); transform: translateY(-1px); }

.btn--ghost {
  background: transparent; color: var(--track-blue);
  border-color: var(--track-blue);
}
.btn--ghost:hover { background: var(--track-blue); color: var(--white); }

.btn--ghost-light {
  background: transparent; color: var(--white);
  border-color: var(--white);
}
.btn--ghost-light:hover { background: var(--white); color: var(--track-blue); }

.btn--lg { padding: 1.05rem 2rem; font-size: 1.05rem; }

/* ---- Hero --------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--midnight) 0%, var(--track-blue) 60%, #14437F 100%);
  color: #E5ECF6;
  padding: 5.5rem 0 5rem;
  position: relative; overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg,
    var(--signal-amber) 0 18px, transparent 18px 30px);
  opacity: 0.7;
}
.hero h1 { color: var(--white); margin-bottom: 0.4em; }
.hero h1 .accent { color: var(--signal-amber); }
.hero p.lede {
  font-size: 1.2rem; max-width: 680px; line-height: 1.55;
  color: #C9D5E8;
  margin-bottom: 2rem;
}
.hero__ctas { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---- Cards & grids ------------------------------------------------------ */
.grid { display: grid; gap: 1.6rem; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 880px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 580px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--white);
  border: 1px solid var(--rail-grey);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.card h3 { margin-top: 0; }
.card a.card__link { text-decoration: none; }
.card--clickable:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.card__tag {
  display: inline-block;
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--platform-mist); color: var(--track-blue);
  padding: 0.25em 0.8em; border-radius: 100px;
  margin-bottom: 0.8em;
}
.card__tag--amber { background: var(--signal-amber); color: var(--white); }
.card__tag--steel { background: var(--signal-steel); color: var(--white); }
.card__tag--midnight { background: var(--midnight); color: var(--white); }

/* ---- Cert badge mini (used inline) -------------------------------------- */
.cert-row { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; margin: 1rem 0 0.5rem; }
.cert-badge {
  width: 92px; height: 100px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* ---- Page header (subpages) --------------------------------------------- */
.page-header {
  background: var(--track-blue);
  color: var(--white);
  padding: 3.5rem 0 3rem;
  border-bottom: 4px solid var(--signal-amber);
}
.page-header h1 { color: var(--white); margin-bottom: 0.2em; }
.page-header p { color: #C9D5E8; font-size: 1.1rem; max-width: 680px; margin: 0; }

/* ---- Prose article (blog & static pages) -------------------------------- */
.prose {
  font-size: 1.05rem;
  line-height: 1.72;
  color: #1F2D44;
}
.prose h2 { margin-top: 2.4em; padding-top: 0.4em; }
.prose h3 { margin-top: 2em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.5em; }
.prose blockquote {
  border-left: 4px solid var(--signal-amber);
  padding: 0.4em 1.2em;
  margin: 1.5em 0;
  background: var(--platform-mist);
  color: var(--track-blue);
  font-style: italic;
}
.prose strong { color: var(--track-blue); }
.prose hr {
  border: 0; height: 1px; background: var(--rail-grey); margin: 2.5em 0;
}
.prose .callout {
  background: var(--platform-mist);
  border-left: 4px solid var(--track-blue);
  padding: 1em 1.4em;
  margin: 1.4em 0;
  border-radius: var(--radius);
}
.prose .callout--amber { border-left-color: var(--signal-amber); }
.prose .callout strong { color: var(--track-blue); }

.post-meta {
  font-size: 0.92rem; color: var(--signal-steel);
  display: flex; flex-wrap: wrap; gap: 1.4rem; align-items: center;
  margin-bottom: 1.6em; padding-bottom: 1em;
  border-bottom: 1px solid var(--rail-grey);
}
.post-meta .tag {
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--signal-amber); color: var(--white);
  padding: 0.25em 0.8em; border-radius: 100px;
}

/* CTA panel embedded in articles / pages */
.cta-panel {
  background: linear-gradient(135deg, var(--track-blue), #14437F);
  color: var(--white);
  border-radius: var(--radius);
  padding: 2.2rem 2rem;
  margin: 2.5em 0;
  text-align: left;
  box-shadow: var(--shadow-md);
  border-left: 5px solid var(--signal-amber);
}
.cta-panel h3 { color: var(--white); margin-top: 0; font-size: 1.3rem; }
.cta-panel p  { color: #D4DEEE; margin-bottom: 1.2em; }

/* ---- Tables ------------------------------------------------------------- */
.tbl {
  width: 100%; border-collapse: collapse; font-size: 0.95rem;
  margin: 1.4em 0; background: var(--white);
  border: 1px solid var(--rail-grey); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.tbl th, .tbl td {
  text-align: left; padding: 0.85em 1em;
  border-bottom: 1px solid var(--rail-grey);
}
.tbl th {
  background: var(--platform-mist); color: var(--track-blue);
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase;
}
.tbl tr:last-child td { border-bottom: 0; }
.tbl tr:hover td { background: var(--smoke); }

/* ---- Pricing ------------------------------------------------------------ */
.price-grid { display: grid; gap: 1.4rem; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: stretch; }
@media (max-width: 880px) { .price-grid { grid-template-columns: 1fr; } }

.price-card {
  background: var(--white);
  border: 1px solid var(--rail-grey);
  border-radius: var(--radius);
  padding: 2rem 1.6rem;
  display: flex; flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.price-card--featured {
  border: 2px solid var(--signal-amber);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}
.price-card__flag {
  position: absolute; top: -12px; left: 1.6rem;
  background: var(--signal-amber); color: var(--white);
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.3em 0.9em; border-radius: 100px;
}
.price-card h3 { margin: 0 0 0.2em; font-size: 1.3rem; }
.price-card .price-card__sub { color: var(--signal-steel); font-size: 0.95rem; margin-bottom: 1.2em; }
.price-card .price-card__amount {
  font-family: var(--font-display); font-weight: 900;
  font-size: 2.6rem; line-height: 1; color: var(--track-blue);
}
.price-card .price-card__amount .currency { font-size: 1.2rem; vertical-align: super; margin-right: 0.1em; color: var(--signal-steel); }
.price-card .price-card__period { color: var(--signal-steel); font-size: 0.92rem; margin-bottom: 1.4em; }
.price-card ul { list-style: none; padding: 0; margin: 0 0 1.6em; flex-grow: 1; }
.price-card li {
  padding: 0.5em 0 0.5em 1.5em; position: relative;
  border-bottom: 1px dashed var(--rail-grey);
  font-size: 0.95rem;
}
.price-card li:last-child { border-bottom: 0; }
.price-card li::before {
  content: '✓'; position: absolute; left: 0; top: 0.5em;
  color: var(--signal-amber); font-weight: 700;
}
.price-card .btn { width: 100%; text-align: center; }

/* ---- Forms -------------------------------------------------------------- */
.form-card {
  background: var(--white);
  border: 1px solid var(--rail-grey);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}
.field { margin-bottom: 1.2em; }
.field label {
  display: block;
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--track-blue);
  margin-bottom: 0.4em;
}
.field input, .field select, .field textarea {
  width: 100%;
  padding: 0.75em 0.9em;
  font-family: var(--font-body); font-size: 1rem;
  border: 1.5px solid var(--rail-grey); border-radius: var(--radius);
  background: var(--white); color: var(--track-blue);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 0; border-color: var(--signal-amber);
  box-shadow: 0 0 0 3px rgba(232, 146, 10, 0.18);
}
.field textarea { min-height: 140px; resize: vertical; }
.field--hp { position: absolute; left: -9999px; }   /* honeypot */
.field-error { color: var(--error); font-size: 0.88rem; margin-top: 0.3em; }
.flash {
  padding: 1em 1.2em; border-radius: var(--radius);
  margin-bottom: 1.5em; font-size: 0.95rem;
}
.flash--success { background: #E0F1E8; color: #155834; border-left: 4px solid var(--success); }
.flash--error   { background: #FBE2E2; color: #7C1818; border-left: 4px solid var(--error); }

/* ---- Footer ------------------------------------------------------------- */
.site-footer {
  background: var(--midnight);
  color: #BAC6D8;
  padding: 3.5rem 0 2rem;
  font-size: 0.95rem;
}
.site-footer h4 {
  color: var(--white);
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 1em;
}
.site-footer a { color: #BAC6D8; text-decoration: none; }
.site-footer a:hover { color: var(--signal-amber); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { padding: 0.3em 0; }
.site-footer__cols {
  display: grid; gap: 2rem;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  margin-bottom: 2.5rem;
}
@media (max-width: 820px) {
  .site-footer__cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .site-footer__cols { grid-template-columns: 1fr; }
}
.site-footer__brand { color: var(--white); font-family: var(--font-display); font-weight: 900; font-size: 1.4rem; margin-bottom: 0.5em; }
.site-footer__brand .sip { color: var(--signal-amber); }
.site-footer__legal {
  border-top: 1px solid #1A2D4A; padding-top: 1.5rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  font-size: 0.82rem; color: #7A8AA3;
}

/* ---- Utility ------------------------------------------------------------ */
.text-center { text-align: center; }
.text-amber  { color: var(--signal-amber); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 2rem; }

.divider-track {
  height: 6px;
  background: repeating-linear-gradient(90deg,
    var(--signal-amber) 0 16px, transparent 16px 26px);
  opacity: 0.55;
  margin: 0;
  border: 0;
}

/* Print */
@media print {
  .site-header, .site-footer, .cta-panel, .nav-toggle { display: none; }
}