/* ============================================================
   components.css — Reusable UI (nav, buttons, tags, panels, chips)
   ============================================================ */

/* ---------- Top Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark {
  width: 40px; height: 40px; border-radius: 9px;
  background: linear-gradient(135deg, var(--sap-blue) 0%, var(--sap-cyan) 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: white; font-weight: 800;
  font-size: 10.5px; line-height: 1.05; letter-spacing: -0.02em;
  box-shadow: 0 4px 10px rgba(0,112,242,.35);
  text-align: center;
}
.brand-mark span { display: block; }
.brand-text { font-size: 16px; }
.brand-text b { color: var(--sap-blue); }

.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--ink-2); font-weight: 500; font-size: 14px; }
.nav-links a:hover { color: var(--sap-blue); text-decoration: none; }

.nav-sap-logo {
  display: inline-flex; align-items: center;
  padding: 6px 14px; border-radius: 10px;
  background: var(--white); border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease;
}
.nav-sap-logo:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.nav-sap-logo img { height: 22px; width: auto; display: block; }

/* Theme toggle (nav) — sun ↔ moon icon swap via data-theme */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink-2);
  cursor: pointer;
  position: relative;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease, background-color .3s ease, color .3s ease;
  box-shadow: var(--shadow-sm);
}
.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  border-color: var(--sap-blue);
  color: var(--sap-blue);
}
.theme-toggle svg {
  width: 18px; height: 18px;
  position: absolute;
  transition: transform .35s cubic-bezier(.4,0,.2,1), opacity .25s ease;
}
/* Light theme → show sun, hide moon (rotated off) */
.theme-toggle .tt-sun  { transform: rotate(0deg)  scale(1);   opacity: 1; }
.theme-toggle .tt-moon { transform: rotate(-90deg) scale(0);  opacity: 0; }
/* Dark theme → show moon, hide sun */
[data-theme="dark"] .theme-toggle .tt-sun  { transform: rotate(90deg)  scale(0); opacity: 0; }
[data-theme="dark"] .theme-toggle .tt-moon { transform: rotate(0deg)   scale(1); opacity: 1; }

/* Mobile hamburger (Phase B addition) */
.nav-toggle {
  display: none;
  background: transparent; border: 1px solid var(--line);
  border-radius: 10px; padding: 8px 10px; cursor: pointer;
  color: var(--ink);
}
.nav-toggle svg { display: block; }

@media (max-width: 720px) {
  .nav-links {
    position: absolute; top: 60px; right: 16px; left: 16px;
    background: rgba(255,255,255,.98);
    border: 1px solid var(--line); border-radius: var(--radius-md);
    padding: 14px; flex-direction: column; align-items: stretch; gap: 10px;
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 15px; padding: 8px 6px; }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px;
  font-weight: 600; font-size: 14px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary {
  background: var(--btn-primary-bg); color: var(--btn-primary-text);
  box-shadow: 0 4px 14px rgba(11,27,51,.18);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(11,27,51,.25); text-decoration: none; }
.btn-yellow {
  background: var(--sap-yellow); color: #0B1B33;
  box-shadow: 0 4px 14px rgba(255,199,0,.35);
}
.btn-yellow:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(255,199,0,.45); text-decoration: none; }

/* ---------- Tags ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--white); border: 1px solid var(--line);
  font-size: 13px; color: var(--ink-2); font-weight: 500;
  box-shadow: var(--shadow-sm);
}
.tag .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--sap-blue); }
.tag.yellow .dot { background: var(--sap-yellow); }

/* ---------- Panels (Core Mechanism) ---------- */
.panel {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px;
  box-shadow: var(--shadow-sm);
}
.panel h3 {
  margin: 0 0 10px; font-size: 19px; font-weight: 700;
  display: flex; align-items: center; gap: 10px;
}
.panel h3 .pill {
  font-size: 11px; font-weight: 700;
  padding: 3px 8px; border-radius: 999px;
  letter-spacing: .04em;
}
.panel.before h3 .pill { background: var(--danger-soft); color: var(--danger); }
.panel.after  h3 .pill { background: var(--sap-blue-soft); color: var(--sap-blue-deep); }
.panel.after { border-color: #BFDCFF; }
.panel p { color: var(--ink-2); margin: 0 0 14px; }
.panel ul { margin: 0; padding-left: 18px; color: var(--ink-2); }
.panel ul li { margin-bottom: 8px; }
.panel ul li::marker { color: var(--sap-blue); }
.panel.after ul li::marker { color: var(--sap-yellow); }

/* ---------- Callout ---------- */
.callout {
  margin-top: 36px;
  background: linear-gradient(135deg, var(--sap-blue-soft) 0%, #FFF6D6 100%);
  border: 1px solid #D5E6FF;
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  color: var(--ink);
}

/* ---------- Chips ---------- */
.chip {
  padding: 6px 12px; border-radius: 999px;
  background: var(--sap-yellow-soft); color: #6E5200;
  border: 1px solid #F1D98A;
  font-weight: 700; font-size: 13px;
}
.chip.blue { background: var(--sap-blue-soft); color: var(--sap-blue-deep); border-color: #BFDCFF; }

/* ---------- Subhead divider ---------- */
.subhead {
  display: flex; align-items: center; gap: 10px;
  margin: 32px 0 16px; font-size: 18px; font-weight: 700;
}
.subhead .ln { flex: 1; height: 1px; background: var(--line); }

/* ---------- GIF slot (Phase B) ---------- */
.gif-slot {
  margin: 24px 0 0;
  background: var(--white); border: 1px dashed #BFDCFF;
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm);
  position: relative;
}
.gif-slot video,
.gif-slot img.poster {
  width: 100%; height: auto; display: block;
  background: linear-gradient(135deg, var(--sap-blue-soft) 0%, var(--sap-yellow-soft) 100%);
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.gif-slot video { display: block; }
.gif-slot img.poster { display: none; }
.gif-slot .placeholder {
  position: absolute; top: 0; left: 0; right: 0;
  aspect-ratio: 16 / 9;
  display: grid; place-items: center; text-align: center; padding: 0 24px;
  background: linear-gradient(135deg, rgba(230,242,255,.98) 0%, rgba(255,246,214,.98) 100%);
  color: var(--sap-blue-deep); font-weight: 700;
  font-family: 'JetBrains Mono', monospace; font-size: 14px;
  letter-spacing: .08em; pointer-events: none;
}
.gif-slot .placeholder small {
  display: block; margin-top: 6px;
  color: var(--ink-3); font-size: 11px; letter-spacing: .04em;
}
.gif-slot figcaption {
  padding: 12px 18px; background: var(--white);
  border-top: 1px solid var(--line);
  color: var(--ink-2); font-size: 13.5px; line-height: 1.55;
}

/* ---------- Footer / Contact ---------- */
footer {
  padding: 72px 24px 40px;
  background: var(--footer-bg); color: var(--footer-text);
}
.foot-inner {
  max-width: 1280px; margin: 0 auto;
}
.foot-top {
  margin-bottom: 36px;
  text-align: left;
}
footer h3 {
  font-size: 28px; color: #FFFFFF; margin: 0 0 14px;
  letter-spacing: -0.02em;
}
footer p { margin: 0; color: var(--footer-muted); }

.foot-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
  padding: 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.foot-contact h4 {
  margin: 0 0 16px;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--footer-fade);
}
.foot-contact ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 10px;
}
.foot-contact li a {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 12px; margin-left: -12px;
  border-radius: 8px;
  color: #FFFFFF; text-decoration: none;
  font-weight: 600; font-size: 15px;
  transition: background .15s, color .15s;
}
.foot-contact li a:hover {
  background: rgba(15, 170, 255, 0.12);
  color: var(--sap-cyan);
}
.foot-contact .foot-role {
  font-size: 12px; font-weight: 500;
  color: var(--footer-fade);
  letter-spacing: 0.04em;
}
.foot-contact .foot-name { letter-spacing: -0.005em; }

.foot-actions {
  display: inline-flex; gap: 12px; flex-wrap: wrap;
  justify-content: flex-end; align-items: center;
}
footer .btn-yellow { color: #0B1B33; }
footer .foot-npm {
  background: #FFFFFF; color: #0B1B33;
}

.foot-meta {
  margin-top: 28px;
  font-size: 13px; color: var(--footer-fade);
  text-align: center;
}

@media (max-width: 720px) {
  footer { padding: 56px 20px 32px; }
  .foot-main {
    grid-template-columns: 1fr;
    gap: 28px;
    align-items: flex-start;
  }
  .foot-actions { justify-content: flex-start; }
}

/* Install line — single-line code snippet + copy button + meta line */
.install-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: fit-content;
  margin: 38px auto;
}
.install-row {
  display: inline-flex;
  align-items: stretch;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  min-width: 420px;
  max-width: 100%;
}
.install-line {
  flex: 1;
  margin: 0;
  padding: 10px 22px;
  background: transparent;
  border: none;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 13px;
  color: var(--ink-2);
  white-space: nowrap;
  overflow-x: auto;
}
.install-line code { font: inherit; color: inherit; }
.install-line-copy {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 0 14px;
  background: transparent;
  border: none;
  border-left: 1px solid var(--line);
  color: var(--ink-2);
  font-family: 'Inter', 'Noto Sans KR', system-ui, sans-serif;
  font-size: 13px; font-weight: 600;
  cursor: pointer;
  transition: color .15s ease, background-color .15s ease;
}
.install-line-copy svg { width: 13px; height: 13px; }
.install-line-copy:hover { color: var(--sap-blue); background: rgba(0,112,242,.06); }
.install-line-copy.copied { color: var(--ok); }
.install-line-copy:focus-visible { outline: 2px solid var(--sap-blue); outline-offset: -2px; }

.install-meta {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 9pt;
  color: var(--ink-3);
  font-weight: 500;
}
.install-meta-sep { color: var(--ink-3); opacity: .55; }
.install-meta-stars {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--ink-3);
  text-decoration: none;
  transition: color .15s ease;
}
.install-meta-stars:hover { color: var(--sap-yellow); text-decoration: none; }
.install-meta-stars svg { width: 11px; height: 11px; color: var(--sap-yellow); }

/* Copy-to-clipboard toast — fixed top-left under nav, theme-aware via tokens */
.copy-toast {
  position: fixed;
  top: 96px;          /* under the sticky nav, with 20px breathing margin */
  left: 24px;
  z-index: 100;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-size: 13px; font-weight: 600;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity .25s ease, transform .25s ease;
  pointer-events: none;
}
.copy-toast.show {
  opacity: 1;
  transform: translateY(0);
}
.copy-toast svg {
  width: 16px; height: 16px;
  color: var(--ok);
  flex-shrink: 0;
}
@media (max-width: 720px) {
  .copy-toast { top: 90px; left: 16px; padding: 8px 14px; font-size: 12.5px; }
}

[data-theme="dark"] .install-row {
  background: #071328;
  border-color: #1F2A3E;
}
[data-theme="dark"] .install-line,
[data-theme="dark"] .install-line code { color: #FFFFFF; }
[data-theme="dark"] .install-line-copy { border-left-color: #1F2A3E; color: #FFFFFF; }
[data-theme="dark"] .install-line-copy:hover { color: #6FC0FF; background: rgba(111,192,255,.08); }