/* ==========================================================================
   Riveran — components.css
   Header, footer, buttons, hero, cards, badges, forms, article.
   ========================================================================== */

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--font-heading); font-weight: 600; font-size: var(--fs-sm);
  line-height: 1; text-align: center; white-space: nowrap;
  padding: 0.85rem 1.5rem; border-radius: var(--radius-pill);
  border: 2px solid transparent; transition: transform 0.15s var(--ease), background 0.2s var(--ease), box-shadow 0.2s var(--ease), color 0.2s var(--ease);
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 0.6rem 1.05rem; }
.btn-lg { padding: 1rem 1.9rem; font-size: var(--fs-base); }

.btn-primary { background: var(--color-secondary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-secondary-600); box-shadow: var(--shadow); }

.btn-accent { background: var(--color-accent); color: var(--color-primary-900); }
.btn-accent:hover { background: var(--color-accent-600); }

.btn-ghost { background: transparent; border-color: var(--color-border-strong); color: var(--color-ink); }
.btn-ghost:hover { border-color: var(--color-secondary); color: var(--color-secondary-600); }

.btn-on-dark { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.3); color: #fff; }
.btn-on-dark:hover { background: rgba(255,255,255,0.16); }

/* ----- Header ----- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: var(--header-h); }

.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--color-ink); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 38px; height: 38px; flex: none; }
.brand-name { font-family: var(--font-heading); font-size: 1.3rem; letter-spacing: -0.02em; }

.site-nav ul { list-style: none; display: flex; align-items: center; gap: var(--space-2); padding: 0; }
.site-nav a:not(.btn) {
  display: inline-block; padding: 0.5rem 0.75rem; border-radius: var(--radius-sm);
  color: var(--color-body); font-weight: 500; font-size: var(--fs-sm);
}
.site-nav a:not(.btn):hover { color: var(--color-primary); background: var(--color-mist); text-decoration: none; }
.site-nav a.is-active { color: var(--color-primary); font-weight: 600; }
.site-nav a.is-active::after {
  content: ""; display: block; height: 2px; border-radius: 2px;
  background: var(--color-accent); margin-top: 2px;
}

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; width: 44px; height: 44px;
  align-items: center; justify-content: center; background: transparent; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-ink); border-radius: 2px; transition: transform 0.2s var(--ease), opacity 0.2s var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; left: 0; right: 0; top: var(--header-h);
    background: var(--color-surface); border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow); padding: var(--space-4) var(--space-5);
    clip-path: inset(0 0 100% 0); transition: clip-path 0.25s var(--ease); pointer-events: none;
  }
  .site-nav.open { clip-path: inset(0 0 0 0); pointer-events: auto; }
  .site-nav ul { flex-direction: column; align-items: stretch; gap: var(--space-1); }
  .site-nav a:not(.btn) { padding: 0.7rem 0.5rem; }
  .site-nav .btn { margin-top: var(--space-2); }
  .site-nav a.is-active::after { display: none; }
}

/* ----- Hero ----- */
.hero {
  position: relative; overflow: hidden; color: var(--color-on-dark);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(26,159,166,0.35), transparent 60%),
    linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-900) 70%);
}
.hero .container { position: relative; z-index: 2; padding-block: clamp(3.5rem, 9vw, 7rem); }
.hero h1 { color: #fff; max-width: 16ch; }
.hero h1 .accent { color: var(--color-secondary); }
.hero .lead { color: var(--color-on-dark-muted); max-width: 54ch; margin-top: var(--space-5); font-size: var(--fs-md); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }

.hero-river { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; opacity: 0.5; }
.hero-river path { fill: none; stroke-linecap: round; }
.river-flow {
  stroke-dasharray: 14 22;
  animation: riverFlow 7s linear infinite;
}
.river-flow.delay { animation-duration: 11s; }
@keyframes riverFlow { to { stroke-dashoffset: -360; } }
@media (prefers-reduced-motion: reduce) { .river-flow { animation: none; stroke-dasharray: none; } }

.page-hero {
  background:
    radial-gradient(900px 500px at 90% -20%, rgba(26,159,166,0.25), transparent 60%),
    linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-900) 80%);
  color: var(--color-on-dark);
}
.page-hero .container { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.page-hero h1 { color: #fff; max-width: 20ch; }
.page-hero .lead { color: var(--color-on-dark-muted); margin-top: var(--space-4); max-width: 60ch; }

/* ----- Cards ----- */
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--space-6); box-shadow: var(--shadow-sm);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
  height: 100%;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--color-border-strong); }
.card h3 { margin-bottom: var(--space-3); }
.card p { color: var(--color-muted); }
.card-icon {
  width: 52px; height: 52px; border-radius: var(--radius-sm); margin-bottom: var(--space-4);
  display: grid; place-items: center;
  background: linear-gradient(160deg, var(--color-primary), var(--color-secondary)); color: #fff;
}
.card-icon svg { width: 26px; height: 26px; }
.card-link { display: inline-flex; align-items: center; gap: 0.35rem; margin-top: var(--space-4); font-weight: 600; font-family: var(--font-heading); font-size: var(--fs-sm); }
.card-link svg { width: 16px; height: 16px; transition: transform 0.15s var(--ease); }
.card-link:hover svg { transform: translateX(3px); }

.feature { display: flex; gap: var(--space-4); }
.feature .dot { flex: none; width: 12px; height: 12px; margin-top: 0.5rem; border-radius: 50%; background: var(--color-accent); }
.feature h4 { margin-bottom: var(--space-2); }
.feature p { color: var(--color-muted); }

/* ----- Framework badges ----- */
.badges { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 1rem; border-radius: var(--radius-pill);
  background: var(--color-mist); border: 1px solid var(--color-border);
  font-family: var(--font-heading); font-weight: 600; font-size: var(--fs-sm); color: var(--color-primary);
}
.section--ink .badge { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.18); color: #fff; }
.badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--color-secondary); }

/* ----- CTA band ----- */
.cta-band {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: #fff; border-radius: var(--radius-lg); padding: clamp(2rem, 5vw, 3.5rem);
  text-align: center; box-shadow: var(--shadow-lg);
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,0.9); max-width: 50ch; margin-inline: auto; margin-top: var(--space-3); }
.cta-band .hero-actions { justify-content: center; }

/* ----- Numbered steps ----- */
.steps { counter-reset: step; display: grid; gap: var(--space-5); }
.step { position: relative; padding-left: 4.25rem; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: -0.2rem; width: 3rem; height: 3rem;
  display: grid; place-items: center; border-radius: var(--radius);
  background: var(--color-mist); border: 1px solid var(--color-border);
  font-family: var(--font-heading); font-weight: 700; font-size: 1.25rem; color: var(--color-secondary-600);
}
.step h4 { margin-bottom: var(--space-2); }
.step p { color: var(--color-muted); }

/* ----- Definition list / framework detail ----- */
.framework { padding-block: var(--space-6); border-top: 1px solid var(--color-border); }
.framework:first-of-type { border-top: 0; }
.framework h3 { display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap; }
.framework h3 .tag { font-family: var(--font-body); font-size: var(--fs-xs); font-weight: 600; color: var(--color-accent-600); background: #FCF3E1; padding: 0.2rem 0.6rem; border-radius: var(--radius-pill); }
.framework dl { display: grid; gap: var(--space-3); margin-top: var(--space-4); }
@media (min-width: 720px) { .framework dl { grid-template-columns: 160px 1fr; column-gap: var(--space-5); } }
.framework dt { font-family: var(--font-heading); font-weight: 600; color: var(--color-ink); font-size: var(--fs-sm); }
.framework dd { color: var(--color-muted); }

/* ----- Article ----- */
.article { padding-block: clamp(2.5rem, 6vw, 4rem); }
.article-body { max-width: var(--container-narrow); margin-inline: auto; }
.article-body > * + * { margin-top: var(--space-5); }
.article-body h2 { margin-top: var(--space-7); font-size: var(--fs-xl); }
.article-body h3 { margin-top: var(--space-6); }
.article-body p, .article-body li { font-size: var(--fs-md); color: var(--color-body); }
.article-body ul, .article-body ol { padding-left: 1.4rem; display: grid; gap: var(--space-2); }
.article-meta { color: var(--color-muted); font-size: var(--fs-sm); }
.pull-quote {
  border-left: 4px solid var(--color-accent); padding: var(--space-2) 0 var(--space-2) var(--space-5);
  font-family: var(--font-heading); font-size: var(--fs-lg); color: var(--color-ink); font-weight: 500;
}

.article-card { display: flex; flex-direction: column; }
.article-card .tag-row { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-3); }
.tag { font-family: var(--font-heading); font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.04em; color: var(--color-secondary-600); }

/* ----- Forms ----- */
.form-grid { display: grid; gap: var(--space-4); }
@media (min-width: 640px) { .form-grid .two { grid-template-columns: 1fr 1fr; display: grid; gap: var(--space-4); } }
.field label { display: block; font-family: var(--font-heading); font-weight: 600; font-size: var(--fs-sm); color: var(--color-ink); margin-bottom: var(--space-2); }
.field input, .field textarea, .field select {
  width: 100%; padding: 0.8rem 1rem; border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm); background: #fff; color: var(--color-ink); transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--color-secondary); box-shadow: 0 0 0 3px rgba(26,159,166,0.18);
}
.field textarea { min-height: 150px; resize: vertical; }
.form-note { font-size: var(--fs-sm); color: var(--color-muted); }

.contact-cards { display: grid; gap: var(--space-4); }
.contact-cards .card p { margin-top: var(--space-1); }

/* ----- Footer ----- */
.site-footer { background: var(--color-primary-900); color: var(--color-on-dark-muted); padding-block: var(--space-8) var(--space-5); }
.footer-grid { display: grid; gap: var(--space-6); }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.footer-brand .brand { color: #fff; }
.footer-brand .brand-name { color: #fff; }
.footer-tagline { margin-top: var(--space-4); max-width: 40ch; color: var(--color-on-dark-muted); }
.site-footer h4 { color: #fff; font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: var(--space-4); }
.site-footer ul { list-style: none; padding: 0; display: grid; gap: var(--space-2); }
.site-footer a { color: var(--color-on-dark-muted); font-size: var(--fs-sm); }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  margin-top: var(--space-7); padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between;
  font-size: var(--fs-xs); color: var(--color-on-dark-muted);
}

/* ----- Scroll reveal ----- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }