/* ==========================================================================
   Signal Verse AR — Components
   Buttons · Navigation · Cards · Glass · Forms · Badges · Accordion ·
   Tabs · Modal · Table · Footer · Toast
   ========================================================================== */

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

.btn {
  --btn-bg: var(--accent);
  --btn-fg: #fff;
  --btn-border: transparent;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  min-height: 48px;
  font-family: var(--font-text);
  font-size: var(--fs-callout);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-base);
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--r-pill);
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  white-space: nowrap;
  transform: translateZ(0);
  transition:
    background-color var(--dur-base) var(--ease-standard),
    color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard),
    box-shadow var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-spring);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(
    120px circle at var(--mx, 50%) var(--my, 50%),
    rgba(255, 255, 255, 0.28),
    transparent 65%
  );
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
}

.btn:hover { transform: translateY(-2px) scale(1.015); }
.btn:hover::before { opacity: 1; }
.btn:active { transform: translateY(0) scale(0.97); transition-duration: var(--dur-instant); }

.btn--primary {
  --btn-bg: var(--accent);
  box-shadow: 0 6px 20px rgba(10, 132, 255, 0.26);
}
.btn--primary:hover {
  --btn-bg: var(--accent-hover);
  box-shadow: var(--shadow-glow);
}

.btn--secondary {
  --btn-bg: var(--surface-solid);
  --btn-fg: var(--text);
  --btn-border: var(--border-strong);
  box-shadow: var(--shadow-1);
}
.btn--secondary:hover {
  --btn-border: var(--accent);
  --btn-fg: var(--accent);
  box-shadow: var(--shadow-3);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  --btn-border: transparent;
}
.btn--ghost:hover { --btn-bg: var(--surface-muted); }

.btn--glass {
  --btn-bg: var(--surface-glass);
  --btn-fg: var(--text);
  --btn-border: var(--border-glass);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(180%);
  backdrop-filter: blur(var(--blur-md)) saturate(180%);
  box-shadow: var(--shadow-2), var(--shadow-inset);
}
.btn--glass:hover { --btn-bg: var(--surface-hover); }

.btn--dark {
  --btn-bg: var(--text);
  --btn-fg: var(--bg-elevated);
}

.btn--success { --btn-bg: var(--success); box-shadow: 0 6px 20px rgba(48, 209, 88, 0.25); }
.btn--danger  { --btn-bg: var(--danger); }

.btn--lg { min-height: 56px; padding: var(--space-4) var(--space-8); font-size: var(--fs-body); }
.btn--sm { min-height: 38px; padding: var(--space-2) var(--space-4); font-size: var(--fs-subhead); }
.btn--block { width: 100%; }
.btn--icon { padding: 0; width: 48px; min-height: 48px; border-radius: 50%; }

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.42;
  pointer-events: none;
}

.btn__icon {
  width: 18px; height: 18px;
  flex-shrink: 0;
  transition: transform var(--dur-base) var(--ease-spring);
}
.btn:hover .btn__icon--arrow { transform: translateX(4px); }
.btn:hover .btn__icon--spin { transform: rotate(90deg); }
.btn:hover .btn__icon--bounce { transform: translateY(2px); }

/* Ripple (spawned by ripple.js) */
.ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: rgba(255, 255, 255, 0.42);
  animation: ripple-out 620ms var(--ease-out) forwards;
  pointer-events: none;
  z-index: -1;
}
.btn--secondary .ripple,
.btn--ghost .ripple,
.btn--glass .ripple { background: var(--accent-soft); }

@keyframes ripple-out {
  to { transform: scale(3.2); opacity: 0; }
}

/* Text link with animated underline */
.link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent);
  font-weight: var(--fw-medium);
  padding-bottom: 2px;
}
.link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1.5px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-base) var(--ease-out);
}
.link:hover::after { transform: scaleX(1); transform-origin: left; }
.link svg { width: 15px; height: 15px; transition: transform var(--dur-base) var(--ease-spring); }
.link:hover svg { transform: translateX(3px); }

/* ---- Navigation ---------------------------------------------------------- */

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: var(--space-3) 0;
  transition:
    padding var(--dur-slow) var(--ease-out),
    background-color var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.site-nav::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--surface-veil);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(190%);
  backdrop-filter: blur(var(--blur-lg)) saturate(190%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  pointer-events: none;
}
.site-nav.is-scrolled { padding: var(--space-2) 0; border-bottom-color: var(--border); }
.site-nav.is-scrolled::before { opacity: 1; }
.site-nav.is-hidden { transform: translateY(-105%); }
.site-nav { transition-property: padding, background-color, box-shadow, border-color, transform; }

.site-nav__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-callout);
  letter-spacing: var(--tracking-tight);
  font-family: var(--font-display);
  flex-shrink: 0;
}
.brand__mark {
  width: 34px; height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, var(--accent), var(--cyan));
  box-shadow: 0 4px 14px rgba(10, 132, 255, 0.32);
  transition: transform var(--dur-slow) var(--ease-spring);
}
.brand:hover .brand__mark { transform: rotate(-8deg) scale(1.08); }
.brand__mark svg { width: 20px; height: 20px; }
.brand__text small {
  display: block;
  font-size: var(--fs-micro);
  font-weight: var(--fw-medium);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  margin-top: -2px;
}

.nav-list {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 4px;
  border-radius: var(--r-pill);
}
.nav-list__pill {
  position: absolute;
  top: 4px; left: 0;
  height: calc(100% - 8px);
  border-radius: var(--r-pill);
  background: var(--surface-muted);
  opacity: 0;
  transition:
    transform var(--dur-slow) var(--ease-out),
    width var(--dur-slow) var(--ease-out),
    opacity var(--dur-base) var(--ease-out);
  pointer-events: none;
  z-index: 0;
}
.nav-list:hover .nav-list__pill { opacity: 1; }

.nav-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-subhead);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  border-radius: var(--r-pill);
  white-space: nowrap;
  transition: color var(--dur-base) var(--ease-standard);
}
.nav-link:hover { color: var(--text); }
.nav-link[aria-current="page"] { color: var(--accent); font-weight: var(--fw-semibold); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(var(--blur-sm));
  backdrop-filter: blur(var(--blur-sm));
  color: var(--text-secondary);
  transition:
    background-color var(--dur-base) var(--ease-standard),
    color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard),
    transform var(--dur-base) var(--ease-spring);
}
.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.08);
}
.icon-btn:active { transform: scale(0.92); }
.icon-btn svg { width: 18px; height: 18px; }

/* Theme toggle icon swap */
.theme-toggle__sun,
.theme-toggle__moon {
  grid-area: 1 / 1;
  transition: transform var(--dur-slow) var(--ease-spring), opacity var(--dur-base) var(--ease-out);
}
:root:not([data-theme="dark"]) .theme-toggle__moon { transform: rotate(-90deg) scale(0.4); opacity: 0; }
:root[data-theme="dark"] .theme-toggle__sun { transform: rotate(90deg) scale(0.4); opacity: 0; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__sun { transform: rotate(90deg) scale(0.4); opacity: 0; }
  :root:not([data-theme="light"]) .theme-toggle__moon { transform: none; opacity: 1; }
}

/* Mobile menu */
.nav-toggle { display: none; }
.nav-toggle__bars { position: relative; width: 18px; height: 12px; }
.nav-toggle__bars span {
  position: absolute;
  left: 0; width: 100%; height: 1.6px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast) linear;
}
.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { top: 5.2px; }
.nav-toggle__bars span:nth-child(3) { top: 10.4px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5.2px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5.2px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  padding: 96px var(--gutter) var(--space-8);
  background: var(--surface-veil);
  -webkit-backdrop-filter: blur(var(--blur-xl)) saturate(190%);
  backdrop-filter: blur(var(--blur-xl)) saturate(190%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: scale(1.02);
  transition:
    opacity var(--dur-base) var(--ease-out),
    transform var(--dur-slow) var(--ease-out),
    visibility 0s linear var(--dur-base);
}
.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
  transition-delay: 0s;
}
.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4);
  font-size: var(--fs-h4);
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  border-radius: var(--r-md);
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(14px);
}
.mobile-menu.is-open .mobile-menu__link {
  animation: menu-in var(--dur-slow) var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 38ms);
}
.mobile-menu__link:hover { background: var(--surface-muted); color: var(--accent); }
.mobile-menu__link[aria-current="page"] { color: var(--accent); }
.mobile-menu__link svg { width: 16px; height: 16px; opacity: 0.4; }

@keyframes menu-in {
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1080px) {
  .nav-list { display: none; }
  .nav-toggle { display: grid; }
}

/* ---- Scroll progress ----------------------------------------------------- */

.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  z-index: calc(var(--z-nav) + 1);
  transform-origin: 0 50%;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent), var(--cyan), var(--success));
  pointer-events: none;
}

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

.card {
  position: relative;
  padding: var(--space-6);
  border-radius: var(--r-xl);
  background: var(--surface-solid);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition:
    transform var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out);
}
.card--hover:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-4);
  border-color: var(--border-strong);
}

.card--glass {
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  border-color: var(--border-glass);
  box-shadow: var(--shadow-3), var(--shadow-inset);
}

.card--flat { box-shadow: none; background: var(--surface-muted); border-color: transparent; }
.card--pad-lg { padding: var(--space-8); }
.card--pad-sm { padding: var(--space-5); }

/* Mouse-tracked highlight — coordinates set by tilt.js */
.card--spotlight::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    420px circle at var(--mx, 50%) var(--my, 50%),
    var(--accent-soft),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  pointer-events: none;
}
.card--spotlight:hover::before { opacity: 1; }

/* Tilt wrapper */
.tilt {
  transform-style: preserve-3d;
  transition: transform var(--dur-slow) var(--ease-out);
  will-change: transform;
}
.tilt__inner { transform: translateZ(24px); }

.card__icon {
  display: grid;
  place-items: center;
  width: 52px; height: 52px;
  border-radius: var(--r-md);
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: var(--space-5);
  transition: transform var(--dur-slow) var(--ease-spring),
              background-color var(--dur-base) var(--ease-standard);
}
.card__icon svg { width: 24px; height: 24px; }
.card--hover:hover .card__icon { transform: scale(1.1) rotate(-6deg); }

.card__icon--cyan   { background: var(--cyan-soft); color: var(--cyan); }
.card__icon--green  { background: var(--success-soft); color: var(--success); }
.card__icon--amber  { background: var(--warning-soft); color: var(--warning); }
.card__icon--red    { background: var(--danger-soft); color: var(--danger); }

.card__title {
  font-size: var(--fs-h4);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-3);
}
.card__body {
  color: var(--text-secondary);
  font-size: var(--fs-subhead);
  line-height: var(--lh-loose);
}
.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
}

/* Feature card with numbered index */
.card__index {
  position: absolute;
  top: var(--space-5);
  right: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  letter-spacing: var(--tracking-wide);
}

/* ---- Glass panel --------------------------------------------------------- */

.glass {
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  border: 1px solid var(--border-glass);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-3), var(--shadow-inset);
}

/* ---- Badges / pills / chips ---------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 5px var(--space-3);
  border-radius: var(--r-pill);
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-base);
  background: var(--surface-muted);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.badge--accent  { background: var(--accent-soft);  color: var(--accent);  border-color: transparent; }
.badge--success { background: var(--success-soft); color: var(--success-600, #23A845); border-color: transparent; }
.badge--warning { background: var(--warning-soft); color: #B26A00; border-color: transparent; }
.badge--danger  { background: var(--danger-soft);  color: var(--danger);  border-color: transparent; }
.badge--cyan    { background: var(--cyan-soft);    color: #0090C4;        border-color: transparent; }
:root[data-theme="dark"] .badge--success { color: var(--success); }
:root[data-theme="dark"] .badge--warning { color: var(--warning); }
:root[data-theme="dark"] .badge--cyan { color: var(--cyan); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .badge--success { color: var(--success); }
  :root:not([data-theme="light"]) .badge--warning { color: var(--warning); }
  :root:not([data-theme="light"]) .badge--cyan { color: var(--cyan); }
}

.badge__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.badge__dot--live { animation: pulse-dot 2s var(--ease-in-out) infinite; }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 0 0 currentColor; }
  50% { opacity: 0.55; transform: scale(0.86); box-shadow: 0 0 0 5px transparent; }
}

.pill-group {
  display: inline-flex;
  padding: 4px;
  gap: 2px;
  border-radius: var(--r-pill);
  background: var(--surface-muted);
  border: 1px solid var(--border);
}
.pill {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--r-pill);
  font-size: var(--fs-subhead);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  transition: background-color var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-standard);
}
.pill[aria-selected="true"], .pill.is-active {
  background: var(--surface-solid);
  color: var(--text);
  box-shadow: var(--shadow-1);
}

/* ---- Forms --------------------------------------------------------------- */

.field { display: flex; flex-direction: column; gap: var(--space-2); }

.field__label {
  font-size: var(--fs-footnote);
  font-weight: var(--fw-semibold);
  color: var(--text-secondary);
  letter-spacing: var(--tracking-base);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  min-height: 50px;
  font-size: var(--fs-callout);
  color: var(--text);
  background: var(--surface-solid);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  outline: none;
  transition:
    border-color var(--dur-base) var(--ease-standard),
    box-shadow var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-standard);
}
.input::placeholder, .textarea::placeholder { color: var(--text-tertiary); }
.input:hover, .textarea:hover, .select:hover { border-color: var(--text-tertiary); }
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.textarea { min-height: 148px; resize: vertical; line-height: var(--lh-base); padding-top: var(--space-3); }

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23666' stroke-width='1.6' stroke-linecap='round'%3E%3Cpath d='M4 6.5 8 10.5 12 6.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  background-size: 16px;
  padding-right: var(--space-9);
  cursor: pointer;
}

.field__hint { font-size: var(--fs-caption); color: var(--text-tertiary); }
.field__error {
  font-size: var(--fs-caption);
  color: var(--danger);
  display: flex;
  align-items: center;
  gap: 5px;
}
.field.is-invalid .input,
.field.is-invalid .textarea,
.field.is-invalid .select {
  border-color: var(--danger);
  box-shadow: 0 0 0 4px var(--danger-soft);
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  font-size: var(--fs-subhead);
  color: var(--text-secondary);
  line-height: var(--lh-base);
}
.checkbox input { position: absolute; opacity: 0; width: 0; height: 0; }
.checkbox__box {
  flex-shrink: 0;
  width: 22px; height: 22px;
  margin-top: 1px;
  border-radius: 7px;
  border: 1.5px solid var(--border-strong);
  background: var(--surface-solid);
  display: grid;
  place-items: center;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-base) var(--ease-spring);
}
.checkbox__box svg { width: 13px; height: 13px; color: #fff; opacity: 0; transform: scale(0.4); transition: all var(--dur-base) var(--ease-spring); }
.checkbox input:checked + .checkbox__box { background: var(--accent); border-color: var(--accent); }
.checkbox input:checked + .checkbox__box svg { opacity: 1; transform: scale(1); }
.checkbox input:focus-visible + .checkbox__box { outline: 3px solid var(--accent-ring); outline-offset: 2px; }
.checkbox:active .checkbox__box { transform: scale(0.9); }

.switch {
  position: relative;
  width: 51px; height: 31px;
  border-radius: var(--r-pill);
  background: var(--border-strong);
  flex-shrink: 0;
  cursor: pointer;
  transition: background-color var(--dur-base) var(--ease-out);
}
.switch::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 27px; height: 27px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.18);
  transition: transform var(--dur-base) var(--ease-spring);
}
.switch[aria-checked="true"] { background: var(--success); }
.switch[aria-checked="true"]::after { transform: translateX(20px); }

/* ---- Accordion ----------------------------------------------------------- */

.accordion { border-top: 1px solid var(--border); }
.accordion__item { border-bottom: 1px solid var(--border); }
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  width: 100%;
  padding: var(--space-5) var(--space-2);
  text-align: left;
  font-size: var(--fs-h4);
  font-family: var(--font-display);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-tight);
  color: var(--text);
  transition: color var(--dur-base) var(--ease-standard);
}
.accordion__trigger:hover { color: var(--accent); }
.accordion__icon {
  flex-shrink: 0;
  position: relative;
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  transition: background-color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform var(--dur-slow) var(--ease-spring);
}
.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur-slow) var(--ease-spring), opacity var(--dur-base) linear;
}
.accordion__icon::before { width: 13px; height: 1.6px; }
.accordion__icon::after  { width: 1.6px; height: 13px; }
.accordion__trigger[aria-expanded="true"] .accordion__icon { background: var(--accent); border-color: var(--accent); color: #fff; transform: rotate(180deg); }
.accordion__trigger[aria-expanded="true"] .accordion__icon::after { transform: scaleY(0); opacity: 0; }
.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-slow) var(--ease-out);
}
.accordion__panel > div { overflow: hidden; }
.accordion__trigger[aria-expanded="true"] + .accordion__panel { grid-template-rows: 1fr; }
.accordion__content {
  padding: 0 var(--space-2) var(--space-6);
  max-width: 76ch;
  color: var(--text-secondary);
  line-height: var(--lh-loose);
  font-size: var(--fs-callout);
}
.accordion__content p + p { margin-top: var(--space-3); }

/* ---- Tabs ---------------------------------------------------------------- */

.tabs__list {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.tabs__list::-webkit-scrollbar { display: none; }
.tabs__panel[hidden] { display: none; }
.tabs__panel { animation: fade-up var(--dur-slow) var(--ease-out); }

/* ---- Modal --------------------------------------------------------------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: rgba(17, 17, 17, 0.42);
  -webkit-backdrop-filter: blur(var(--blur-md));
  backdrop-filter: blur(var(--blur-md));
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
.modal.is-open { opacity: 1; visibility: visible; transition-delay: 0s; }
.modal__panel {
  width: min(560px, 100%);
  max-height: 84svh;
  overflow-y: auto;
  padding: var(--space-8);
  border-radius: var(--r-2xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-5);
  transform: scale(0.94) translateY(18px);
  opacity: 0;
  transition: transform var(--dur-slow) var(--ease-spring), opacity var(--dur-base) var(--ease-out);
}
.modal.is-open .modal__panel { transform: scale(1) translateY(0); opacity: 1; }

/* ---- Table --------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface-solid);
}
.table { font-size: var(--fs-subhead); min-width: 560px; }
.table th, .table td {
  padding: var(--space-3) var(--space-5);
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.table thead th {
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--text-tertiary);
  font-weight: var(--fw-semibold);
  background: var(--surface-muted);
  position: sticky;
  top: 0;
}
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr { transition: background-color var(--dur-fast) linear; }
.table tbody tr:hover { background: var(--surface-muted); }
.table td code { white-space: nowrap; }

/* ---- Code block ---------------------------------------------------------- */

.code-block {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: var(--bg-sunken);
  overflow: hidden;
}
.code-block__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  background: var(--surface-muted);
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}
.code-block pre {
  padding: var(--space-5);
  overflow-x: auto;
  font-size: var(--fs-footnote);
  line-height: 1.75;
  color: var(--text-secondary);
  tab-size: 2;
}
.code-block .tok-key { color: var(--accent); }
.code-block .tok-str { color: var(--success); }
.code-block .tok-com { color: var(--text-tertiary); font-style: italic; }
.code-block .tok-fn  { color: var(--purple, #BF5AF2); }

/* ---- Toast --------------------------------------------------------------- */

.toast-region {
  position: fixed;
  left: 50%; bottom: var(--space-6);
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
  width: min(420px, calc(100vw - 2 * var(--gutter)));
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--r-pill);
  background: var(--surface-glass);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  backdrop-filter: blur(var(--blur-lg)) saturate(180%);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-4);
  font-size: var(--fs-subhead);
  font-weight: var(--fw-medium);
  animation: toast-in var(--dur-slow) var(--ease-spring);
}
.toast.is-leaving { animation: toast-out var(--dur-base) var(--ease-out) forwards; }
.toast svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--success); }

@keyframes toast-in  { from { opacity: 0; transform: translateY(18px) scale(0.94); } }
@keyframes toast-out { to   { opacity: 0; transform: translateY(10px) scale(0.96); } }

/* ---- Stat ---------------------------------------------------------------- */

.stat { display: flex; flex-direction: column; gap: var(--space-1); }
.stat__value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-display);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat__label {
  font-size: var(--fs-subhead);
  color: var(--text-secondary);
}
.stat__sub { font-size: var(--fs-caption); color: var(--text-tertiary); }

/* ---- Divider / marquee --------------------------------------------------- */

.divider-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

.marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee__track {
  display: flex;
  gap: var(--space-9);
  width: max-content;
  animation: marquee 38s linear infinite;
}
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

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

.site-footer {
  position: relative;
  padding-top: var(--space-11);
  padding-bottom: var(--space-6);
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: var(--space-8);
  padding-bottom: var(--space-9);
}
@media (max-width: 900px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .site-footer__grid { grid-template-columns: 1fr; gap: var(--space-6); }
}
.footer-col__title {
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--text-tertiary);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-4);
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a {
  font-size: var(--fs-subhead);
  color: var(--text-secondary);
  transition: color var(--dur-base) var(--ease-standard), transform var(--dur-base) var(--ease-out);
  display: inline-block;
}
.footer-col a:hover { color: var(--accent); transform: translateX(3px); }

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
}

/* ---- Custom cursor ------------------------------------------------------- */

.sv-cursor {
  position: fixed;
  top: 0; left: 0;
  z-index: var(--z-cursor);
  pointer-events: none;
  mix-blend-mode: difference;
  opacity: 0;
  transition: opacity var(--dur-base) linear;
}
.sv-cursor.is-visible { opacity: 1; }
.sv-cursor__dot {
  position: absolute;
  width: 7px; height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border-radius: 50%;
  background: #fff;
}
.sv-cursor__ring {
  position: absolute;
  width: 34px; height: 34px;
  margin: -17px 0 0 -17px;
  border-radius: 50%;
  border: 1.2px solid rgba(255, 255, 255, 0.75);
  transition: width var(--dur-base) var(--ease-spring),
              height var(--dur-base) var(--ease-spring),
              margin var(--dur-base) var(--ease-spring),
              opacity var(--dur-base) linear;
}
.sv-cursor.is-hovering .sv-cursor__ring {
  width: 58px; height: 58px;
  margin: -29px 0 0 -29px;
  opacity: 0.55;
}
.sv-cursor.is-pressed .sv-cursor__ring {
  width: 26px; height: 26px;
  margin: -13px 0 0 -13px;
}

@media (hover: none), (pointer: coarse) {
  .sv-cursor { display: none; }
}