/* ==========================================================================
   CodeArrive - Components
   Buttons, surfaces, cards, forms, modal, accordion, and the scroll-reveal
   animation system.
   ========================================================================== */

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: 900px; }
.prose { max-width: var(--max-w-prose); }

.section {
  position: relative;
  padding-block: var(--section-y);
}

/* Alternating band, with hairlines to make the change of surface deliberate
   rather than accidental. */
.section--band {
  background: var(--ink-soft);
  border-block: 1px solid var(--line);
}

.stack > * + * { margin-top: var(--stack-gap, 1rem); }

.grid { display: grid; gap: clamp(1rem, 0.6rem + 1.4vw, 1.5rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17.5rem), 1fr)); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(to right, transparent, var(--line-hi), transparent);
}

/* Structural blueprint grid. Reads as engineering drafting, not as a glow. */
.blueprint {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgb(255 255 255 / 0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(255 255 255 / 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: center;
  -webkit-mask-image: radial-gradient(ellipse 80% 62% at 50% 42%, #000 25%, transparent 76%);
  mask-image: radial-gradient(ellipse 80% 62% at 50% 42%, #000 25%, transparent 76%);
}

/* ==========================================================================
   Surfaces
   ========================================================================== */

.panel {
  background: var(--navy);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--edge-top), var(--shadow-sm);
}

.panel--raised {
  background: var(--navy-soft);
  box-shadow: var(--edge-top), var(--shadow-lg);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: var(--line-hi);

  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 44px;              /* touch target floor */
  padding: 0.75rem 1.35rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--r-md);
  font-size: var(--t-sm);
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
  isolation: isolate;
  transition:
    background-color var(--d-fast) var(--ease-ui),
    border-color var(--d-fast) var(--ease-ui),
    color var(--d-fast) var(--ease-ui),
    transform var(--d-fast) var(--ease-ui),
    box-shadow var(--d-base) var(--ease-ui);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); transition-duration: 60ms; }

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
}

/* Primary - the only solid royal fill on the page. */
.btn--primary {
  --btn-bg: var(--royal);
  --btn-fg: #fff;
  --btn-bd: var(--royal);
  box-shadow: 0 1px 0 0 rgb(255 255 255 / 0.14) inset, 0 6px 20px -10px var(--royal);
}
.btn--primary:hover { --btn-bg: #3a6cea; --btn-bd: #3a6cea; }
.btn--primary:active { --btn-bg: var(--royal-lo); --btn-bd: var(--royal-lo); }

/* Secondary - hairline outline on the canvas. */
.btn--ghost {
  --btn-bg: rgb(255 255 255 / 0.02);
}
.btn--ghost:hover {
  --btn-bg: var(--navy-hi);
  --btn-bd: var(--line-hi);
}

/* Tertiary - text only, for low-priority actions. */
.btn--quiet {
  --btn-bd: transparent;
  --btn-fg: var(--silver);
  padding-inline: 0.85rem;
}
.btn--quiet:hover { --btn-fg: var(--paper); --btn-bg: rgb(255 255 255 / 0.04); }

.btn--sm { min-height: 38px; padding: 0.5rem 0.95rem; font-size: var(--t-xs); }
.btn--block { width: 100%; }

.btn .icon {
  width: 1rem;
  height: 1rem;
  flex: none;
  transition: transform var(--d-base) var(--ease-out);
}

/* The arrow nudges forward on hover - a small, deliberate signal of
   direction rather than a bouncing animation. */
.btn:hover .icon--arrow { transform: translateX(3px); }

/* ==========================================================================
   Tags, chips, pills
   ========================================================================== */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgb(255 255 255 / 0.02);
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  color: var(--silver);
  white-space: nowrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--navy);
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--silver);
}

.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--positive);
  box-shadow: 0 0 0 3px rgb(75 163 160 / 0.18);
}

/* Filter chip - a real <button>, so it is keyboard operable by default. */
.chip {
  min-height: 38px;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: transparent;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--silver);
  transition:
    background-color var(--d-fast) var(--ease-ui),
    border-color var(--d-fast) var(--ease-ui),
    color var(--d-fast) var(--ease-ui);
}

.chip:hover { color: var(--paper); border-color: var(--line-hi); }

.chip[aria-pressed="true"] {
  background: var(--royal);
  border-color: var(--royal);
  color: #fff;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: clamp(1.4rem, 1rem + 1.1vw, 2rem);
  background: var(--navy);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--edge-top), var(--shadow-sm);
  transition:
    transform var(--d-slow) var(--ease-out),
    border-color var(--d-base) var(--ease-ui),
    background-color var(--d-base) var(--ease-ui);
}

.card--interactive:hover {
  transform: translateY(-4px);
  border-color: var(--line-hi);
  background: var(--navy-soft);
}

/* A hairline of accent that draws itself along the top edge on hover. */
.card--interactive::before {
  content: "";
  position: absolute;
  inset-inline: -1px;
  top: -1px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--royal-hi), transparent);
  transform: scaleX(0);
  transition: transform var(--d-slow) var(--ease-out);
}
.card--interactive:hover::before,
.card--interactive:focus-within::before { transform: scaleX(1); }

.card__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--royal-wash);
  color: var(--royal-hi);
  flex: none;
}

.card__icon svg { width: 20px; height: 20px; }

.card__title { font-size: var(--t-h3); margin-top: 1.25rem; }
.card__body { margin-top: 0.7rem; color: var(--silver); font-size: var(--t-sm); }

.card__list {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.55rem;
}

.card__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: var(--t-xs);
  color: var(--steel);
}

.card__list li::before {
  content: "";
  width: 5px;
  height: 5px;
  margin-top: 0.5rem;
  flex: none;
  border-radius: 1px;
  background: var(--royal-hi);
  opacity: 0.8;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.field { display: block; }

.field__label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: var(--t-xs);
  font-weight: 600;
  color: var(--silver);
}

.field__label .req { color: var(--royal-hi); margin-left: 2px; }

.field__hint {
  margin-top: 0.4rem;
  font-size: var(--t-micro);
  color: var(--steel);
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 46px;
  padding: 0.7rem 0.9rem;
  background: var(--navy-soft);
  color: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  font-size: var(--t-sm);
  transition:
    border-color var(--d-fast) var(--ease-ui),
    box-shadow var(--d-fast) var(--ease-ui),
    background-color var(--d-fast) var(--ease-ui);
}

.textarea { min-height: 96px; resize: vertical; line-height: 1.6; }

.input::placeholder,
.textarea::placeholder { color: var(--steel); }

.input:hover,
.textarea:hover,
.select:hover { border-color: var(--line-hi); }

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--royal);
  box-shadow: 0 0 0 3px var(--royal-wash);
  background: var(--navy-hi);
}

/* Native select arrow replaced with an inline SVG so it matches the palette. */
.select {
  appearance: none;
  padding-right: 2.4rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239aa8be' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.8rem center;
  background-size: 16px;
}

.select option { background: var(--navy); color: var(--paper); }

input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.65);
  cursor: pointer;
}

/* Chrome paints autofilled inputs white - override it. */
.input:-webkit-autofill,
.input:-webkit-autofill:hover,
.input:-webkit-autofill:focus,
.textarea:-webkit-autofill {
  -webkit-text-fill-color: var(--paper);
  -webkit-box-shadow: 0 0 0 1000px var(--navy-soft) inset;
  caret-color: var(--paper);
  transition: background-color 9999s ease-out;
}

/* Invalid state is announced by aria-invalid, and mirrored visually here. */
[aria-invalid="true"] {
  border-color: var(--negative) !important;
}
[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px rgb(224 138 138 / 0.16) !important;
}

.field__error {
  display: none;
  margin-top: 0.4rem;
  font-size: var(--t-micro);
  color: var(--negative);
}
.field__error.is-shown { display: block; }

/* Radio-style option rows built from real buttons. */
.option {
  display: block;
  width: 100%;
  padding: 0.85rem 1rem;
  text-align: left;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition:
    border-color var(--d-fast) var(--ease-ui),
    background-color var(--d-fast) var(--ease-ui);
}

.option:hover { background: var(--navy-hi); border-color: var(--line-hi); }

.option[aria-pressed="true"] {
  border-color: var(--royal);
  background: var(--royal-wash);
}

.option__title { font-size: var(--t-sm); font-weight: 600; }
.option__hint { margin-top: 0.15rem; font-size: var(--t-micro); color: var(--steel); }

/* ==========================================================================
   Modal / dialog
   ========================================================================== */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: rgb(3 5 9 / 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--d-base) var(--ease-ui),
    visibility var(--d-base) var(--ease-ui);
}

.modal.is-open { opacity: 1; visibility: visible; }

.modal__panel {
  width: 100%;
  max-width: 34rem;
  max-height: min(88svh, 52rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--navy);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--edge-top), var(--shadow-lg);
  transform: translateY(18px) scale(0.985);
  opacity: 0;
  transition:
    transform var(--d-slow) var(--ease-out),
    opacity var(--d-base) var(--ease-out);
}

.modal.is-open .modal__panel { transform: none; opacity: 1; }

.modal--wide .modal__panel { max-width: 44rem; }

.modal__head {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem clamp(1.25rem, 1rem + 1vw, 2rem);
  background: var(--navy);
  border-bottom: 1px solid var(--line);
}

.modal__body { padding: clamp(1.25rem, 1rem + 1vw, 2rem); }

.modal__close {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: none;
  margin: -0.4rem -0.5rem 0 0;
  border-radius: var(--r-md);
  color: var(--steel);
  transition: color var(--d-fast) var(--ease-ui), background-color var(--d-fast) var(--ease-ui);
}
.modal__close:hover { color: var(--paper); background: var(--navy-hi); }
.modal__close svg { width: 20px; height: 20px; }

/* On phones the dialog becomes a bottom sheet - far easier to reach. */
@media (max-width: 640px) {
  .modal { padding: 0; align-items: end; }
  .modal__panel {
    max-width: none;
    max-height: 92svh;
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    transform: translateY(100%);
  }
}

/* ==========================================================================
   Accordion
   ========================================================================== */

.accordion { border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.accordion__item + .accordion__item { border-top: 1px solid var(--line); }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  min-height: 60px;
  padding: 1.15rem clamp(1rem, 0.8rem + 0.8vw, 1.5rem);
  text-align: left;
  font-size: var(--t-sm);
  font-weight: 600;
  background: transparent;
  transition: background-color var(--d-fast) var(--ease-ui);
}

.accordion__trigger:hover { background: rgb(255 255 255 / 0.025); }
.accordion__trigger[aria-expanded="true"] { background: rgb(255 255 255 / 0.02); }

.accordion__trigger svg {
  width: 18px;
  height: 18px;
  flex: none;
  color: var(--royal-hi);
  transition: transform var(--d-base) var(--ease-in-out);
}
.accordion__trigger[aria-expanded="true"] svg { transform: rotate(180deg); }

/* Height is animated from an inline pixel value set by JS, so the panel can
   still size itself to its content. */
.accordion__panel {
  height: 0;
  overflow: hidden;
  transition: height var(--d-base) var(--ease-in-out);
}

.accordion__panel > div {
  padding: 0 clamp(1rem, 0.8rem + 0.8vw, 1.5rem) 1.35rem;
  color: var(--silver);
  font-size: var(--t-sm);
}

/* ==========================================================================
   Scroll-reveal
   --------------------------------------------------------------------------
   Elements start slightly low and transparent; an IntersectionObserver adds
   .is-visible. --i staggers siblings. Motion is small (18px) and eased out -
   noticeable but never bouncy.
   ========================================================================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--d-reveal) var(--ease-out),
    transform var(--d-reveal) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 80ms);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* If JS never runs, content must still be readable. */
.no-js [data-reveal] { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Utility
   ========================================================================== */

.flow-sm > * + * { margin-top: 0.5rem; }
.flow > * + * { margin-top: 1rem; }
.flow-lg > * + * { margin-top: 1.75rem; }

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.center { text-align: center; }
.center-x { margin-inline: auto; }

.scrollbar-none { scrollbar-width: none; }
.scrollbar-none::-webkit-scrollbar { display: none; }

.fade-x {
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}