/* ============================================
   CHERRS BIM — Design Tokens (v2)
   Color:  paper #F4F6F5 · ink #16232B · steel #2F4858
           mechanical #D9A441 · electrical #C1462B
           plumbing #2E7D8C · fire #8C2F39 · muted #5B6B72
   Type:   Display — Big Shoulders Display (condensed industrial)
           Body    — IBM Plex Sans
           Utility — IBM Plex Mono
   Signature: coordination stack — misaligned system bars
              that snap into alignment (clash resolution)
   ============================================ */

:root {
  --paper: #F4F6F5;
  --panel: #FFFFFF;
  --ink: #16232B;
  --steel: #2F4858;
  --steel-dark: #202F39;
  --muted: #5B6B72;
  --line: #D7DCDD;

  --mech: #D9A441;   /* Mechanical */
  --elec: #C1462B;   /* Electrical */
  --plumb: #2E7D8C;  /* Plumbing */
  --fire: #8C2F39;   /* Fire Protection */

  --font-display: 'Big Shoulders Display', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-width: 1180px;
  --radius: 3px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0;
}

p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
img { max-width: 100%; display: block; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--plumb);
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

/* ---------- Scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 246, 245, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 2px 18px rgba(22, 35, 43, 0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(4, 3px);
  gap: 2px;
  align-items: end;
  height: 22px;
}

.brand-mark span {
  display: block;
  width: 3px;
  background: var(--steel);
}

.brand-mark span:nth-child(1) { height: 60%; background: var(--mech); }
.brand-mark span:nth-child(2) { height: 100%; background: var(--elec); }
.brand-mark span:nth-child(3) { height: 75%; background: var(--plumb); }
.brand-mark span:nth-child(4) { height: 45%; background: var(--fire); }

.brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.brand-text em { font-style: normal; color: var(--plumb); }

.main-nav ul {
  display: flex;
  gap: 2.2rem;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.2s ease;
}

.main-nav a:hover, .main-nav a:focus-visible, .main-nav a.active { color: var(--ink); }

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--elec);
  transition: width 0.3s var(--ease);
}

.main-nav a:hover::after, .main-nav a:focus-visible::after, .main-nav a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--line);
  padding: 8px 10px;
  cursor: pointer;
}

.nav-toggle span { width: 18px; height: 2px; background: var(--ink); display: block; }

/* ---------- Layout helpers ---------- */

.section {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 1.5rem;
}

.section-head { max-width: 640px; margin-bottom: 3rem; }

.section-head h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); margin-bottom: 1rem; }

.section-lede { color: var(--muted); font-size: 1.02rem; text-transform: none; letter-spacing: normal; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary { background: var(--elec); color: #fff; }
.btn-primary:hover { background: #a83a22; box-shadow: 0 8px 20px rgba(193, 70, 43, 0.25); }

.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--steel); }

.btn-sm { padding: 0.6rem 1.15rem; font-size: 0.82rem; }

/* ---------- Hero ---------- */

.hero { padding-top: 4rem; }

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(3rem, 6.5vw, 4.6rem);
  line-height: 0.98;
  margin-bottom: 1.3rem;
}

.hero-copy h1 .dot { color: var(--elec); }

.hero-lede {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 46ch;
  margin-bottom: 2.2rem;
  text-transform: none;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Signature: coordination stack */

.stack-widget {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem 1.8rem 1.6rem;
  box-shadow: 0 20px 44px rgba(22, 35, 43, 0.07);
}

.stack-frame {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.stack-bar {
  --w: 60%;
  position: relative;
  height: 34px;
  width: var(--w);
  border-radius: 2px;
  display: flex;
  align-items: center;
  padding: 0 0.9rem;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(var(--offset, 40px));
  animation: bar-in 0.8s var(--ease) forwards;
}

.bar-m { background: var(--mech); color: #3a2a06; --offset: 60px; animation-delay: 0.15s; }
.bar-e { background: var(--elec); --offset: -50px; animation-delay: 0.35s; }
.bar-p { background: var(--plumb); --offset: 70px; animation-delay: 0.55s; }
.bar-f { background: var(--fire); --offset: -40px; animation-delay: 0.75s; }

@keyframes bar-in {
  0% { opacity: 0; transform: translateX(var(--offset)); }
  70% { opacity: 1; }
  100% { opacity: 1; transform: translateX(0); }
}

.stack-caption {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: none;
}

.stat-strip {
  margin-top: 4.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat {
  padding: 1.7rem 1rem;
  border-right: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2rem;
}

.stat:last-child { border-right: none; }

.stat-num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  color: var(--steel);
  line-height: 1;
}

.stat-plus { font-family: var(--font-display); font-size: 1.4rem; color: var(--steel); }

.stat-label {
  width: 100%;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-top: 0.3rem;
}

/* ---------- Services ---------- */

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
}

/* Flip card shell */

.service-card {
  background: transparent;
  border: none;
  padding: 0;
  height: 230px;
  perspective: 1200px;
  cursor: pointer;
}

.service-card:focus-visible { outline: none; }
.service-card:focus-visible .card-inner { box-shadow: 0 0 0 2px var(--elec); }

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: var(--radius);
  transition: transform 0.7s var(--ease);
  transform-style: preserve-3d;
}

.service-card:hover .card-inner,
.service-card.is-flipped .card-inner {
  transform: rotateY(180deg);
}

.card-front, .card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--steel);
  padding: 1.7rem 1.5rem;
  box-shadow: 0 10px 20px rgba(22, 35, 43, 0.05);
}

.service-card.disc-m .card-front, .service-card.disc-m .card-back { border-left-color: var(--mech); }
.service-card.disc-e .card-front, .service-card.disc-e .card-back { border-left-color: var(--elec); }
.service-card.disc-p .card-front, .service-card.disc-p .card-back { border-left-color: var(--plumb); }
.service-card.disc-f .card-front, .service-card.disc-f .card-back { border-left-color: var(--fire); }
.service-card.disc-s .card-front, .service-card.disc-s .card-back { border-left-color: var(--steel); }

.service-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  display: inline-block;
  margin-bottom: 0.9rem;
}

.card-front h3 {
  font-size: 1.05rem;
  text-transform: none;
  letter-spacing: normal;
  margin-bottom: 0.6rem;
  font-weight: 600;
  font-family: var(--font-body);
}

.card-front p {
  color: var(--muted);
  font-size: 0.9rem;
  text-transform: none;
}

.card-back {
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-align: center;
  background: var(--steel-dark);
  border-left-width: 4px;
}

.card-back-icon {
  font-size: 1.6rem;
  color: #fff;
  line-height: 1;
  margin-bottom: 0.3rem;
}

.card-back-label {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  color: #fff;
  text-transform: none;
}

.card-back-note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9FB4BC;
}

.service-grid-note {
  margin-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: none;
}

@media (max-width: 640px) {
  .service-card { height: 210px; }
}

/* ---------- Samples (PDF) ---------- */

.samples {
  margin-top: 4rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 3rem;
  align-items: center;
}

.samples-head h3 {
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  margin-bottom: 0.9rem;
  text-transform: none;
  font-weight: 700;
}

.sample-card {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.sample-card:focus-visible { outline: 2px solid var(--elec); outline-offset: 2px; }

.sample-readonly-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: none;
  align-self: center;
}

.sample-card:hover {
  box-shadow: 0 20px 40px rgba(22, 35, 43, 0.1);
  transform: translateY(-4px);
}

.sample-thumb {
  position: relative;
  background: linear-gradient(155deg, var(--steel-dark), var(--steel));
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.6rem;
}

.doc-visual {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s var(--ease);
}

.sample-card:hover .doc-visual { transform: translateY(-4px) rotate(-1deg); }

.doc-page {
  width: 78%;
  max-width: 190px;
  aspect-ratio: 3 / 4;
  background: var(--panel);
  border-radius: 2px;
  box-shadow: 0 18px 34px rgba(0, 0, 0, 0.28);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.doc-page::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 0; height: 0;
  border-style: solid;
  border-width: 0 16px 16px 0;
  border-color: transparent var(--line) transparent transparent;
}

.doc-title-line {
  width: 70%;
  height: 7px;
  background: var(--ink);
  border-radius: 1px;
  opacity: 0.85;
}

.doc-sub-line {
  width: 45%;
  height: 4px;
  background: var(--line);
  border-radius: 1px;
  margin-bottom: 0.4rem;
}

.doc-bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: auto;
}

.doc-bar { height: 5px; border-radius: 1px; }
.doc-bar.bar-m { width: 80%; background: var(--mech); }
.doc-bar.bar-e { width: 65%; background: var(--elec); }
.doc-bar.bar-p { width: 90%; background: var(--plumb); }
.doc-bar.bar-f { width: 55%; background: var(--fire); }

.doc-pagecount {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.sample-badge {
  position: absolute;
  top: 0.8rem;
  left: 0.8rem;
  background: var(--elec);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.25rem 0.55rem;
  border-radius: 2px;
  letter-spacing: 0.06em;
}

.sample-badge-lock {
  left: auto;
  right: 0.8rem;
  background: var(--steel-dark);
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
}

.sample-details {
  padding: 1.6rem 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.8rem;
}

.sample-details h4 {
  font-size: 1.05rem;
  text-transform: none;
  font-weight: 600;
  font-family: var(--font-body);
}

.sample-details p {
  color: var(--muted);
  font-size: 0.9rem;
  text-transform: none;
}

.sample-actions { display: flex; gap: 0.7rem; flex-wrap: wrap; margin-top: 0.3rem; }

/* ---------- Why Choose ---------- */

.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 3rem;
  border-top: 1px solid var(--line);
}

.why-list li {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.96rem;
  color: var(--ink);
}

.why-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
}

.why-icon.disc-m { background: var(--mech); }
.why-icon.disc-e { background: var(--elec); }
.why-icon.disc-p { background: var(--plumb); }
.why-icon.disc-f { background: var(--fire); }
.why-icon.disc-s { background: var(--steel); }

@media (max-width: 900px) {
  .why-grid { grid-template-columns: 1fr; gap: 0; }
}

/* ---------- Our Commitment ---------- */

.commitment {
  max-width: 100%;
  padding: 0;
}

.commitment-inner {
  background: var(--steel-dark);
  padding: 4.5rem 1.5rem;
  text-align: center;
}

.commitment-body {
  max-width: 760px;
  margin: 0 auto 1.6rem;
  color: #CBDCE2;
  font-size: 1.05rem;
  text-transform: none;
  line-height: 1.7;
}

.commitment-tagline {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  color: #fff;
  letter-spacing: 0.02em;
}

.commitment-tagline span { color: var(--mech); }

/* ---------- About ---------- */

.about-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.about-copy h2 { font-size: clamp(1.9rem, 3.2vw, 2.4rem); margin-bottom: 1.2rem; }

.about-copy p {
  color: var(--muted);
  margin-bottom: 1.1rem;
  max-width: 54ch;
  text-transform: none;
}

.about-lod {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.lod-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.3rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}

.lod-row:last-child { border-bottom: none; }

.lod-row:nth-child(6n+1) .lod-tag { color: var(--mech); }
.lod-row:nth-child(6n+2) .lod-tag { color: var(--elec); }
.lod-row:nth-child(6n+3) .lod-tag { color: var(--plumb); }
.lod-row:nth-child(6n+4) .lod-tag { color: var(--fire); }
.lod-row:nth-child(6n+5) .lod-tag { color: var(--steel); }
.lod-row:nth-child(6n+6) .lod-tag { color: var(--mech); }

.lod-tag {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.82rem;
  width: 5.5rem;
  flex-shrink: 0;
}

/* ---------- Contact ---------- */

.contact-inner { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 3rem; }

.contact-form {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}

.form-row { display: flex; flex-direction: column; gap: 0.5rem; }

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-row label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.form-row input, .form-row select, .form-row textarea {
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border-radius: var(--radius);
  resize: vertical;
  transition: border-color 0.2s ease;
}

.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--plumb);
}

.contact-form .btn { align-self: flex-start; }

/* ---------- Attachment / file upload ---------- */

.tb-optional {
  text-transform: none;
  letter-spacing: 0;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.72rem;
}

.file-upload {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}

.file-upload-input {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.file-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--paper);
  color: var(--steel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.65rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}

.file-upload-icon { flex-shrink: 0; transition: transform 0.2s ease; }

.file-upload-btn:hover {
  border-color: var(--elec);
  color: var(--elec);
  background: #fff;
  transform: translateY(-1px);
}

.file-upload-btn:hover .file-upload-icon { transform: rotate(-8deg); }

.file-upload-input:focus-visible + .file-upload-btn {
  outline: 2px solid var(--plumb);
  outline-offset: 2px;
}

.file-upload-info {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.5rem 0.6rem 0.5rem 0.85rem;
  max-width: 100%;
}

.file-upload-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 15rem;
}

.file-upload-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
}

.file-upload-remove:hover { background: var(--fire); color: #fff; }

.file-upload-hint {
  flex-basis: 100%;
  font-size: 0.75rem;
  color: var(--muted);
}

.file-upload.has-error .file-upload-btn { border-color: var(--fire); color: var(--fire); }

.contact-info { display: flex; flex-direction: column; gap: 1.8rem; }

.info-block .tb-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.info-block p { margin-top: 0.4rem; color: var(--ink); font-size: 0.95rem; }

/* ---------- PDF read-only modal ---------- */

.pdf-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
}

.pdf-modal.open { display: block; }

.pdf-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(14, 20, 24, 0.72);
  backdrop-filter: blur(2px);
  animation: fade-in 0.25s ease;
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.pdf-modal-panel {
  position: relative;
  z-index: 1;
  max-width: 760px;
  height: 88vh;
  margin: 6vh auto;
  background: var(--paper);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.4);
  animation: modal-in 0.35s var(--ease);
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.pdf-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.3rem;
  background: var(--steel-dark);
  color: #fff;
}

.pdf-modal-heading {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

#pdfModalTitle {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
}

.pdf-modal-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #9FB4BC;
}

.pdf-modal-close {
  background: none;
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s ease;
}

.pdf-modal-close:hover { background: rgba(255,255,255,0.12); }

.pdf-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  background: #E7EAEA;
  user-select: none;
  -webkit-user-select: none;
}

.pdf-modal-loading {
  margin: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
}

.pdf-page-canvas {
  max-width: 100%;
  height: auto;
  box-shadow: 0 6px 18px rgba(22, 35, 43, 0.18);
  border-radius: 2px;
  pointer-events: none;
}

@media (max-width: 640px) {
  .pdf-modal-panel { height: 92vh; margin: 4vh auto; max-width: 94vw; }
  .pdf-modal-body { padding: 1rem; }
}

/* ---------- Feedback modal (success / error popup) ---------- */

.feedback-modal {
  position: fixed;
  inset: 0;
  z-index: 210;
  display: none;
}

.feedback-modal.open { display: block; }

.feedback-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(14, 20, 24, 0.72);
  backdrop-filter: blur(2px);
  animation: fade-in 0.25s ease;
}

.feedback-panel {
  position: relative;
  z-index: 1;
  max-width: 380px;
  margin: 16vh auto 0;
  background: var(--panel);
  border-radius: var(--radius);
  padding: 2.6rem 2rem 2.2rem;
  text-align: center;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.4);
  animation: modal-in 0.35s var(--ease);
}

.feedback-close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.3rem;
  transition: color 0.2s ease;
}

.feedback-close:hover { color: var(--ink); }

.feedback-icon-wrap {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.3rem;
}

.feedback-svg { width: 100%; height: 100%; }

.feedback-circle {
  stroke-width: 3;
  stroke-dasharray: 151;
  stroke-dashoffset: 151;
  animation: feedback-circle-draw 0.5s var(--ease) forwards;
}

.feedback-mark {
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 40;
  stroke-dashoffset: 40;
  animation: feedback-mark-draw 0.4s var(--ease) forwards 0.45s;
}

.feedback-modal.is-success .feedback-circle,
.feedback-modal.is-success .feedback-mark { stroke: var(--plumb); }

.feedback-modal.is-error .feedback-circle,
.feedback-modal.is-error .feedback-mark { stroke: var(--elec); }

.feedback-modal.is-info .feedback-circle { stroke: var(--mech); }

.feedback-info-mark {
  fill: var(--mech);
  opacity: 0;
  animation: feedback-info-in 0.3s ease forwards 0.45s;
}

@keyframes feedback-info-in { to { opacity: 1; } }

@keyframes feedback-circle-draw { to { stroke-dashoffset: 0; } }
@keyframes feedback-mark-draw { to { stroke-dashoffset: 0; } }

#feedbackTitle {
  font-size: 1.25rem;
  text-transform: none;
  margin-bottom: 0.6rem;
}

#feedbackMessage {
  color: var(--muted);
  font-size: 0.92rem;
  text-transform: none;
  line-height: 1.6;
  margin-bottom: 1.6rem;
}

.feedback-ok { width: 100%; }

@media (max-width: 640px) {
  .feedback-panel { max-width: 88vw; margin-top: 22vh; }
}

/* ---------- Password gate modal (protected portfolio PDF) ---------- */

.password-modal {
  position: fixed;
  inset: 0;
  z-index: 220;
  display: none;
}

.password-modal.open { display: block; }

.password-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(14, 20, 24, 0.72);
  backdrop-filter: blur(2px);
  animation: fade-in 0.25s ease;
}

.password-modal-panel {
  position: relative;
  z-index: 1;
  max-width: 380px;
  margin: 16vh auto 0;
  background: var(--panel);
  border-radius: var(--radius);
  padding: 2.6rem 2rem 2.2rem;
  text-align: center;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.4);
  animation: modal-in 0.35s var(--ease);
}

.password-modal-close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.3rem;
  transition: color 0.2s ease;
}

.password-modal-close:hover { color: var(--ink); }

.password-modal-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.1rem;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--steel);
  display: flex;
  align-items: center;
  justify-content: center;
}

#passwordModalTitle {
  font-size: 1.25rem;
  text-transform: none;
  margin-bottom: 0.5rem;
}

.password-modal-sub {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1.4rem;
}

.password-modal-form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.password-modal-form input {
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 0.75rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border-radius: var(--radius);
  text-align: center;
  transition: border-color 0.2s ease;
}

.password-modal-form input:focus {
  outline: none;
  border-color: var(--plumb);
}

.password-modal-form.has-error input {
  border-color: var(--fire);
}

.password-modal-error {
  color: var(--fire);
  font-size: 0.82rem;
  margin: -0.4rem 0 0;
}

.password-modal-submit { width: 100%; }

@media (max-width: 640px) {
  .password-modal-panel { max-width: 88vw; margin-top: 22vh; }
}

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

.site-footer { border-top: 1px solid var(--line); }

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.6rem 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
}

/* ---------- Focus ---------- */

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--elec);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */

@media (max-width: 980px) {
  .hero-inner, .about-inner, .contact-inner, .samples { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2n) { border-right: none; }
  .sample-card { grid-template-columns: 1fr; }
  .sample-thumb { height: 220px; }
}

@media (max-width: 640px) {
  .main-nav ul {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    display: none;
  }

  .main-nav ul.open { display: flex; }

  .main-nav a { padding: 1rem 1.5rem; display: block; border-bottom: 1px solid var(--line); }

  .nav-toggle { display: flex; }

  .service-grid { grid-template-columns: 1fr; }
  .stat-strip { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: none; }

  .section { padding: 4rem 1.3rem; }
}