/* ==========================================================================
   NORTHLINE PROJECTS — components: buttons, header, mobile menu, forms
   ========================================================================== */

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

.btn {
  --bg: var(--rust);
  --fg: var(--warm);
  --bg-hover: var(--char);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.9em;
  min-height: 56px;
  padding: 0.9em 1.9em;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--bg);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  isolation: isolate;
  transition: color 0.4s var(--ease), border-color 0.4s var(--ease);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--bg-hover);
  transform: translateY(101%);
  transition: transform 0.5s var(--ease);
}

.btn:hover::before,
.btn:focus-visible::before {
  transform: none;
}

.btn:hover,
.btn:focus-visible {
  color: var(--warm);
  border-color: var(--bg-hover);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex: none;
  transition: transform 0.45s var(--ease);
}

.btn:hover svg,
.btn:focus-visible svg {
  transform: translateX(5px);
}

.btn--dark {
  --bg: var(--char);
  --bg-hover: var(--rust);
}

.btn--light {
  --bg: var(--warm);
  --fg: var(--char);
  --bg-hover: var(--rust);
}

.btn--ghost {
  --bg: transparent;
  --fg: currentColor;
  --bg-hover: var(--warm);
  border-color: currentColor;
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  color: var(--char);
  border-color: var(--warm);
}

.btn--ghost-dark {
  --bg: transparent;
  --fg: var(--char);
  --bg-hover: var(--char);
  border-color: var(--line-strong);
}

.btn--ghost-dark:hover,
.btn--ghost-dark:focus-visible {
  border-color: var(--char);
}

.btn--sm {
  min-height: 46px;
  padding: 0.75em 1.4em;
  font-size: 0.95rem;
}

.btn--lg {
  min-height: 66px;
  padding-inline: 2.4em;
  font-size: 1.15rem;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.8em;
  padding-block: 0.5em;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: inherit;
  background: linear-gradient(currentColor, currentColor) left bottom / 100% 2px no-repeat;
  transition: color 0.3s var(--ease), background-size 0.5s var(--ease);
}

.link-arrow svg {
  width: 16px;
  height: 16px;
  transition: transform 0.45s var(--ease);
}

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--rust);
  background-size: 40% 2px;
}

.on-dark .link-arrow:hover,
.on-dark .link-arrow:focus-visible {
  color: var(--rust-lt);
}

.link-arrow:hover svg,
.link-arrow:focus-visible svg {
  transform: translateX(6px);
}

/* --------------------------------------------------------------------------
   Header: transparent over the hero, solid charcoal once scrolled
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  padding-block: 24px;
  color: var(--warm);
  border-bottom: 1px solid transparent;
  transition: padding 0.45s var(--ease), background-color 0.45s var(--ease), border-color 0.45s var(--ease);
}

.site-header.is-scrolled {
  padding-block: 14px;
  background: rgba(27, 28, 30, 0.96);
  border-bottom-color: var(--char-3);
}

.menu-open .site-header {
  background: transparent;
  border-bottom-color: transparent;
  color: var(--char);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  position: relative;
  z-index: 2;
  display: inline-grid;
  gap: 0.34em;
  line-height: 1;
}

.logo::before {
  content: "";
  width: 34px;
  height: 4px;
  margin-bottom: 0.5em;
  background: var(--rust);
  transform-origin: left;
  transition: transform 0.6s var(--ease);
}

.logo:hover::before {
  transform: scaleX(1.7);
}

.logo__name {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  margin-right: -0.16em;
}

.logo__sub {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.5em;
  margin-right: -0.5em;
  opacity: 0.78;
}

.nav {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1.6rem, 3vw, 3rem);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding-block: 0.5em;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: inherit;
  opacity: 0.86;
  transition: opacity 0.3s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--rust-lt);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link.is-active {
  opacity: 1;
}

.nav__link:hover::after,
.nav__link:focus-visible::after,
.nav__link.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-header__cta {
  display: none;
}

.menu-toggle {
  position: relative;
  z-index: 2;
  width: 48px;
  height: 48px;
  margin-right: -10px;
  display: grid;
  place-items: center;
}

.menu-toggle__bars {
  position: relative;
  width: 28px;
  height: 12px;
}

.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  height: 2px;
  background: currentColor;
  transition: transform 0.55s var(--ease), top 0.55s var(--ease), width 0.55s var(--ease);
}

.menu-toggle__bars::before {
  top: 0;
  width: 100%;
}

.menu-toggle__bars::after {
  top: 10px;
  width: 62%;
}

.menu-open .menu-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.menu-open .menu-toggle__bars::after {
  top: 5px;
  width: 100%;
  transform: rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  padding: calc(var(--header-h) + 24px) var(--gutter) 32px;
  background: var(--warm);
  color: var(--char);
  visibility: hidden;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.7s var(--ease-in-out), visibility 0s linear 0.7s;
  overflow-y: auto;
}

.menu-open .mobile-menu {
  visibility: visible;
  clip-path: inset(0 0 0 0);
  transition: clip-path 0.7s var(--ease-in-out), visibility 0s;
}

.mobile-menu__list {
  display: grid;
  margin-block: auto;
}

.mobile-menu__link {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.06em;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3rem, 15vw, 4.8rem);
  line-height: 1.02;
  text-transform: uppercase;
  color: var(--char);
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), color 0.3s;
}

.mobile-menu__link span {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--rust);
}

.mobile-menu__link:hover,
.mobile-menu__link.is-active {
  color: var(--rust);
}

.menu-open .mobile-menu__link {
  opacity: 1;
  transform: none;
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease), color 0.3s;
  transition-delay: calc(0.25s + var(--i) * 60ms);
}

.mobile-menu__foot {
  display: grid;
  gap: 1.4rem;
  margin-top: 2rem;
  padding-top: 1.6rem;
  color: var(--ink-2);
  font-size: 0.98rem;
}

.mobile-menu__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.8rem;
}

.quote-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 55;
  padding: 12px var(--gutter) calc(12px + env(safe-area-inset-bottom));
  background: rgba(27, 28, 30, 0.97);
  transform: translateY(101%);
  transition: transform 0.5s var(--ease);
}

.quote-bar.is-visible {
  transform: none;
}

.quote-bar .btn {
  width: 100%;
}

.menu-open .quote-bar {
  transform: translateY(101%);
}

@media (min-width: 1020px) {
  .nav {
    display: block;
  }

  .site-header__cta {
    display: inline-flex;
  }

  .menu-toggle,
  .mobile-menu,
  .quote-bar {
    display: none;
  }
}

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

.field {
  display: grid;
  gap: 4px;
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

.field__label {
  padding: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust-dk);
}

.on-dark .field__label {
  color: var(--rust-lt);
}

.input {
  width: 100%;
  min-height: 56px;
  padding: 0.7em 0;
  background: transparent;
  color: inherit;
  border: 0;
  border-bottom: 2px solid var(--line-strong);
  border-radius: 0;
  font: inherit;
  font-size: 1.15rem;
  font-weight: 500;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.3s;
}

.input::placeholder {
  color: var(--concrete-dk);
  font-weight: 400;
}

textarea.input {
  min-height: 108px;
  resize: vertical;
  line-height: 1.5;
}

select.input {
  padding-right: 1.8em;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'><path d='M1 1l6 6 6-6' fill='none' stroke='%23b5532b' stroke-width='2'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.1em center;
}

.input:hover {
  border-bottom-color: var(--char);
}

.input:focus-visible {
  outline: none;
  border-bottom-color: var(--rust);
}

.form-grid {
  display: grid;
  gap: 26px;
}

@media (min-width: 640px) {
  .form-grid--2 {
    grid-template-columns: 1fr 1fr;
    gap: 26px 36px;
  }
}

/* Project-type chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.chip {
  position: relative;
}

.chip input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.chip span {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0.5em 1.2em;
  border: 1px solid var(--line-strong);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

.chip input:hover + span {
  border-color: var(--char);
}

.chip input:checked + span {
  background: var(--char);
  border-color: var(--char);
  color: var(--warm);
}

.chip input:focus-visible + span {
  outline: 2px solid var(--rust);
  outline-offset: 2px;
}

.form-error {
  min-height: 1.4em;
  font-size: 0.95rem;
  font-weight: 500;
  color: #a4321a;
}

.form-fine {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--mute);
}

.form-done {
  display: grid;
  gap: 1.1rem;
  animation: done-in 0.7s var(--ease) both;
}

.form-done[hidden] {
  display: none;
}

@keyframes done-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
}

.form-done h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 0.95;
  text-transform: uppercase;
}