/* ============================================================
   CalcSuite — Reset, typography, layout shell
   ============================================================ 
*/

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  background-image: var(--bg-tint);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--t-mid), color var(--t-mid);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  margin: 0 0 var(--sp-3);
  letter-spacing: -0.02em;
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { margin: 0 0 var(--sp-3); }

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-strong); }

ul, ol { margin: 0 0 var(--sp-3); padding-left: 1.15rem; }
li { margin-bottom: .3rem; }

code, kbd, samp, .mono { font-family: var(--font-mono); font-size: .92em; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--primary);
  color: var(--on-primary);
  padding: .6rem 1rem;
  border-radius: 0 0 var(--r-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--glass);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  min-height: var(--header-h);
  padding: .6rem var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.32rem;
  color: var(--text);
  letter-spacing: -.03em;
  flex-shrink: 0;
}
.brand:hover { color: var(--text); }
.brand-mark { display: inline-flex; transition: transform var(--t-mid); }
.brand:hover .brand-mark { transform: rotate(-8deg) scale(1.06); }
.brand-accent {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Wrapper that is a plain row on desktop and the drawer on mobile */
.header-panel {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex: 1 1 auto;
  min-width: 0;
}

/* On desktop the nav takes the free space and centres its links inside it,
   so the menu sits between the brand and the actions rather than hugging left. */
@media (min-width: 861px) {
  .header-panel .main-nav {
    flex: 1 1 auto;
    justify-content: center;
    margin-left: 0;
  }
}

.main-nav { display: flex; gap: .2rem; margin-left: var(--sp-3); }
.nav-icon { display: none; }
.main-nav a {
  padding: .48rem .78rem;
  border-radius: var(--r-pill);
  color: var(--text-muted);
  font-weight: 500;
  font-size: .925rem;
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}
.main-nav a:hover { color: var(--text); background: var(--surface-2); }
.main-nav a.is-active { color: var(--primary); background: var(--primary-soft); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: .5rem; }

.search-wrap { position: relative; display: flex; align-items: center; }
.search-icon {
  position: absolute; left: .95rem;
  top: 50%;
  transform: translateY(-50%);   /* centred on the input, not the flex line */
  color: var(--text-muted); font-size: .9rem; pointer-events: none;
  transition: color var(--t-fast);
}
.search-wrap:focus-within .search-icon { color: var(--primary); }
/* NOTE: these are scoped as `.search-wrap .search-input` (specificity 0,2,0)
   deliberately. components.css styles `input[type='search']` (0,1,1), which
   would otherwise win and reset the padding, killing the icon clearance. */
.search-wrap .search-input {
  width: 272px;
  /* left padding must clear the icon so the placeholder never overlaps it */
  padding: .55rem 2.4rem .55rem 2.95rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: inherit;
  font-size: var(--fs-sm);
  text-overflow: ellipsis;
  transition: width var(--t-mid), border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}
/* Placeholder must stay legible — it is the only label this control has */
.search-wrap .search-input::placeholder { color: var(--text-muted); opacity: 1; }
.search-wrap .search-input:hover { border-color: var(--primary); }
.search-wrap .search-input:focus {
  outline: none;
  width: 320px;
  background: var(--surface);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--ring);
}
.search-wrap .search-input:focus::placeholder { color: var(--text-faint); }
.search-kbd {
  position: absolute; right: .55rem;
  font-size: .68rem;
  padding: .05rem .35rem;
  border: 1px solid var(--border);
  border-radius: var(--r-xs);
  color: var(--text-faint);
  background: var(--surface);
  pointer-events: none;
}
.search-input:focus ~ .search-kbd { opacity: 0; }

.search-dropdown {
  position: absolute;
  top: calc(100% + .5rem);
  right: 0;
  width: min(380px, 86vw);
  max-height: 60vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  padding: .35rem;
  z-index: 120;
  animation: pop-in var(--t-fast) both;
}
.search-result {
  display: flex; align-items: center; gap: .7rem;
  width: 100%;
  padding: .5rem .6rem;
  border-radius: var(--r-sm);
  color: var(--text);
  font-size: var(--fs-sm);
}
.search-result:hover, .search-result.is-active { background: var(--surface-2); color: var(--text); }
.search-result i { color: var(--primary); width: 1.1rem; text-align: center; }
.search-result small { color: var(--text-faint); margin-left: auto; font-size: var(--fs-xs); }
.search-empty { padding: .8rem; color: var(--text-muted); font-size: var(--fs-sm); text-align: center; }

/* Needs to out-specify .icon-btn from components.css, which loads later */
.header-inner .nav-toggle { display: none; }
/* Icon buttons grow a text label only inside the mobile drawer */
.action-label { display: none; }
#github-link:hover { color: var(--primary); }

.route-progress {
  height: 2px;
  width: 0;
  background: var(--gradient-brand);
  transition: width var(--t-mid), opacity var(--t-mid);
  opacity: 0;
}
.route-progress.is-loading { width: 70%; opacity: 1; }
.route-progress.is-done { width: 100%; opacity: 0; }

/* ---------------- Main ---------------- */
#main-content {
  flex: 1 0 auto;
  max-width: var(--wrap);
  width: 100%;
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-4) var(--sp-8);
  outline: none;
}
.route-view { animation: route-in var(--t-slow) both; }

@keyframes route-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
@keyframes pop-in {
  from { opacity: 0; transform: translateY(-4px) scale(.99); }
  to { opacity: 1; transform: none; }
}

/* ---------------- Footer ---------------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--surface);
  margin-top: auto;
}
.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-4);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--sp-4);
}
.footer-brand strong { font-family: var(--font-display); font-size: 1.05rem; }
.footer-brand p { color: var(--text-muted); font-size: var(--fs-sm); margin: .3rem 0 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: .35rem 1.1rem; align-content: start; justify-content: flex-end; }
.footer-links a { font-size: var(--fs-sm); color: var(--text-muted); }
.footer-links a:hover { color: var(--primary); }
.footer-note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: var(--sp-4);
  border-top: 1px dashed var(--border);
  color: var(--text-faint);
  font-size: var(--fs-xs);
}

/* ---------------- Responsive ---------------- */
@media (max-width: 980px) {
  .search-wrap .search-input { width: 190px; }
  .search-wrap .search-input:focus { width: 240px; }
  .main-nav { margin-left: 0; }
  .main-nav a { padding: .45rem .58rem; font-size: .88rem; }
}

/* ---- Mobile drawer: everything except brand + burger lives inside ---- */
@media (max-width: 860px) {
  .header-inner .nav-toggle { display: inline-flex; margin-left: auto; order: 3; }

  .header-panel {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: .35rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: .7rem var(--sp-4) var(--sp-4);
    box-shadow: var(--shadow-md);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    transition: opacity var(--t-fast), transform var(--t-fast);
  }
  .header-panel.is-open { opacity: 1; transform: none; pointer-events: auto; }

  .main-nav { flex-direction: column; gap: .15rem; margin-left: 0; }
  .main-nav a {
    display: flex; align-items: center; gap: .7rem;
    padding: .7rem .8rem;
    border-radius: var(--r-sm);
    font-size: var(--fs-md);
  }
  .nav-icon { display: inline-block; width: 1.15rem; text-align: center; color: var(--text-faint); }
  .main-nav a.is-active .nav-icon { color: var(--primary); }

  /* Search, theme and GitHub become full-width menu rows */
  .header-actions {
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: .15rem;
    padding-top: .5rem;
    border-top: 1px dashed var(--border);
  }
  /* Search sits above everything else in the drawer */
  .search-wrap {
    order: -1;
    width: 100%;
    margin-bottom: .55rem;
    padding-top: .6rem;
    padding-bottom: .6rem;
    border-bottom: 1px dashed var(--border);
  }
  .search-wrap .search-input,
  .search-wrap .search-input:focus { width: 100%; }
  .search-kbd { display: none; }
  .search-dropdown { width: 100%; left: 0; right: 0; }

  .header-actions .action-btn {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    align-items: center;
    gap: .7rem;
    height: auto;
    padding: .7rem .8rem;
    border: 0;
    background: transparent;
    border-radius: var(--r-sm);
    color: var(--text-muted);
    font-size: var(--fs-md);
    font-weight: 500;
  }
  .header-actions .action-btn:hover { background: var(--surface-2); color: var(--text); }
  .header-actions .action-btn i { width: 1.15rem; text-align: center; flex-shrink: 0; }
  .action-label { display: inline; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  #main-content { padding: var(--sp-5) var(--sp-4) var(--sp-7); }
}

/* The wordmark stays visible at every width, per design */
@media (max-width: 420px) {
  .brand { font-size: 1.4rem; }
  .brand-text { display: inline; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}