/* ═══════════════════════════════════════════════════════════════════════════
   ZEROFAIL Studio — Main Stylesheet
   Design System: Black & White Premium Corporate
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. Variables ─────────────────────────────────────────────────────────── */
:root {
  /* Typography (overridden by PHP theme engine via inline <style>) */
  --f-heading:   'Playfair Display', Georgia, 'Times New Roman', serif;
  --f-body:      'Inter', system-ui, -apple-system, 'Helvetica Neue', sans-serif;
  --fw-heading:  700;
  --fw-body:     400;

  /* Colors */
  --c-bg:          #ffffff;
  --c-bg-alt:      #f7f7f7;
  --c-bg-dark:     #0f0f0f;
  --c-text:        #111111;
  --c-text-muted:  #737373;
  --c-text-light:  #b0b0b0;
  --c-border:      #e8e8e8;
  --c-border-dark: #2a2a2a;
  --c-sidebar-bg:  #0f0f0f;
  --c-sidebar-txt: #d4d4d4;
  --c-topbar-bg:   #0f0f0f;
  --c-topbar-txt:  #a0a0a0;
  --c-primary:     #111111;
  --c-accent:      #111111;

  /* Layout */
  --sidebar-w:    240px;
  --topbar-h:     44px;
  --pad:          clamp(20px, 4vw, 56px);
  --content-max:  1060px;

  /* Transitions */
  --ease:         0.18s ease;
  --ease-out:     0.25s cubic-bezier(0.22, 1, 0.36, 1);

  /* Radius */
  --r-sm:  4px;
  --r-md:  8px;
}

/* ── 2. Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--f-body);
  font-weight: var(--fw-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul, ol { list-style: none; }
abbr[title] { text-decoration: underline dotted; cursor: help; }
h1,h2,h3,h4 { font-family: var(--f-heading); font-weight: var(--fw-heading); line-height: 1.15; }

/* ── 3. Skip Link ─────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute; top: -100%; left: 8px;
  padding: 8px 16px; background: var(--c-bg-dark); color: #fff;
  font-size: .875rem; border-radius: var(--r-sm); z-index: 9999;
  transition: top var(--ease);
}
.skip-link:focus { top: 8px; }

/* ── 4. Layout ────────────────────────────────────────────────────────────── */
.zf-layout {
  display: flex;
  min-height: 100dvh;
}

.zf-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin-left: var(--sidebar-w);
}

.zf-content {
  flex: 1;
  padding: 0 var(--pad) var(--pad);
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}

/* ── 5. Sidebar ───────────────────────────────────────────────────────────── */
.zf-sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100dvh;
  background: var(--c-sidebar-bg);
  color: var(--c-sidebar-txt);
  display: flex;
  flex-direction: column;
  z-index: 200;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
}

/* Brand / Logo */
.zf-sidebar__brand {
  padding: 28px 20px 20px;
  border-bottom: 1px solid var(--c-border-dark);
}
.zf-sidebar__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #ffffff;
  text-decoration: none;
}
.zf-sidebar__logo:hover { text-decoration: none; opacity: .85; }
.zf-sidebar__logo-mark { font-size: 1rem; color: #ffffff; }
.zf-sidebar__logo-sub {
  font-size: .6875rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-text-light);
  margin-top: 2px;
  padding-left: 22px;
}

/* Nav */
.zf-sidebar__nav { padding: 16px 0; }
.zf-sidebar__nav-list { display: flex; flex-direction: column; gap: 1px; }

.zf-sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--c-sidebar-txt);
  letter-spacing: .02em;
  transition: color var(--ease), background var(--ease);
  border-left: 2px solid transparent;
  text-decoration: none;
}
.zf-sidebar__nav-link:hover {
  color: #ffffff;
  background: rgba(255,255,255,.05);
  text-decoration: none;
}
.zf-sidebar__nav-link.is-active {
  color: #ffffff;
  border-left-color: #ffffff;
  background: rgba(255,255,255,.06);
}
.zf-sidebar__nav-glyph { font-size: .625rem; opacity: .6; }

/* Separator */
.zf-sidebar__sep {
  height: 1px;
  background: var(--c-border-dark);
  margin: 8px 20px;
}

/* Industries */
.zf-sidebar__industries { padding: 8px 0 12px; }
.zf-sidebar__section-label {
  font-size: .625rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-text-light);
  padding: 4px 20px 8px;
}
.zf-sidebar__industry-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 20px;
  font-size: .75rem;
  color: var(--c-text-muted);
  transition: color var(--ease);
  text-decoration: none;
}
.zf-sidebar__industry-link:hover,
.zf-sidebar__industry-link.is-active { color: var(--c-sidebar-txt); text-decoration: none; }
.zf-sidebar__industry-count {
  font-size: .6875rem;
  color: var(--c-text-light);
  background: rgba(255,255,255,.06);
  padding: 1px 6px;
  border-radius: 20px;
}

/* Sidebar footer */
.zf-sidebar__footer {
  margin-top: auto;
  padding: 16px 20px;
  border-top: 1px solid var(--c-border-dark);
}
.zf-sidebar__email {
  font-size: .6875rem;
  color: var(--c-text-muted);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}
.zf-sidebar__email:hover { color: var(--c-sidebar-txt); text-decoration: none; }
.zf-sidebar__version { font-size: .625rem; color: var(--c-border-dark); margin-top: 4px; }

/* ── 6. Topbar ────────────────────────────────────────────────────────────── */
.zf-topbar {
  height: var(--topbar-h);
  background: var(--c-topbar-bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--c-border-dark);
  gap: 16px;
  flex-shrink: 0;
}
.zf-topbar__breadcrumb, .zf-topbar__right {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .75rem;
  color: var(--c-topbar-txt);
}
.zf-topbar__bc-home { color: var(--c-topbar-txt); opacity: .6; text-decoration: none; }
.zf-topbar__bc-home:hover { opacity: 1; text-decoration: none; }
.zf-topbar__bc-sep { opacity: .4; }
.zf-topbar__tagline { font-size: .75rem; color: var(--c-topbar-txt); }
.zf-topbar__link { color: var(--c-topbar-txt); text-decoration: none; transition: color var(--ease); }
.zf-topbar__link:hover { color: #ffffff; text-decoration: none; }
.zf-topbar__link--cta {
  background: rgba(255,255,255,.1);
  padding: 4px 12px;
  border-radius: var(--r-sm);
  font-weight: 500;
  color: #ffffff;
}
.zf-topbar__link--cta:hover { background: rgba(255,255,255,.18); }
.zf-topbar__divider { opacity: .2; }

/* ── 7. Hamburger (mobile only) ───────────────────────────────────────────── */
.zf-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  position: fixed;
  top: 4px; left: 8px;
  z-index: 300;
  background: var(--c-bg-dark);
  border-radius: var(--r-sm);
  padding: 8px;
}
.zf-hamburger span {
  display: block;
  height: 2px;
  background: #ffffff;
  transition: transform var(--ease), opacity var(--ease);
}
.zf-hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.zf-hamburger.is-open span:nth-child(2) { opacity: 0; }
.zf-hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.zf-sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 190;
  backdrop-filter: blur(2px);
}

/* ── 8. Sections ──────────────────────────────────────────────────────────── */
.zf-section {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--c-border);
}
.zf-section--alt { background: var(--c-bg-alt); }
.zf-section--dark {
  background: var(--c-bg-dark);
  color: #ffffff;
  border-bottom: none;
}

.zf-section__header {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: start;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 56px);
}
.zf-section__num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--c-border);
  font-family: var(--f-heading);
  line-height: 1;
}
.zf-section__label {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 6px;
}
.zf-section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.1;
}
.zf-section__link {
  font-size: .8125rem;
  color: var(--c-text-muted);
  text-decoration: none;
  white-space: nowrap;
  padding-top: 4px;
  transition: color var(--ease);
}
.zf-section__link:hover { color: var(--c-text); text-decoration: none; }

/* ── 9. Hero ──────────────────────────────────────────────────────────────── */
.zf-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
  padding: clamp(48px, 8vw, 100px) 0 clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--c-border);
}
.zf-hero__tag { margin-bottom: 20px; }
.zf-hero__headline {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  margin-bottom: 20px;
  letter-spacing: -.02em;
}
.zf-hero__headline em { font-style: italic; }
.zf-hero__sub {
  font-size: 1.0625rem;
  color: var(--c-text-muted);
  margin-bottom: 36px;
  line-height: 1.6;
}
.zf-hero__sub strong { color: var(--c-text); font-weight: 600; }
.zf-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}
.zf-hero__stats {
  display: flex;
  align-items: center;
  gap: 0;
}
.zf-hero__stat { flex: 1; }
.zf-hero__stat-divider {
  width: 1px; height: 32px;
  background: var(--c-border);
  margin: 0 24px;
}
.zf-hero__stat-num {
  display: block;
  font-family: var(--f-heading);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 4px;
}
.zf-hero__stat-num sup { font-size: .7em; }
.zf-hero__stat-label { font-size: .75rem; color: var(--c-text-muted); }

/* Hero visual (decorative browser mockup) */
.zf-hero__visual { display: flex; justify-content: center; align-items: center; }
.zf-hero__window {
  width: 100%;
  max-width: 440px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,.08);
}
.zf-hero__win-bar {
  height: 36px;
  background: var(--c-bg-alt);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
}
.zf-hero__win-bar span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-border);
}
.zf-hero__win-content { padding: 20px; background: var(--c-bg); }
.zf-hero__win-line {
  height: 10px;
  background: var(--c-bg-alt);
  border-radius: 3px;
  margin-bottom: 10px;
}
.zf-hero__win-line--h { height: 18px; width: 60%; margin-bottom: 14px; background: var(--c-border); }
.zf-hero__win-line--short { width: 70%; }
.zf-hero__win-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 8px;
  margin-top: 16px;
}
.zf-hero__win-card {
  height: 56px;
  background: var(--c-bg-alt);
  border-radius: var(--r-sm);
  border: 1px solid var(--c-border);
}

/* ── 10. Portfolio Grid ───────────────────────────────────────────────────── */
.zf-portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
  margin: 0 -1px;
}
.zf-portfolio-grid--full {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.zf-portfolio-card {
  background: var(--c-bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform var(--ease-out);
}
.zf-portfolio-card:hover { z-index: 1; }

.zf-portfolio-card__img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: grayscale(30%);
  transition: filter var(--ease), transform var(--ease-out);
}
.zf-portfolio-card:hover .zf-portfolio-card__img {
  filter: grayscale(0%);
  transform: scale(1.02);
}

.zf-portfolio-card__placeholder {
  width: 100%;
  aspect-ratio: 3 / 2;
  background: var(--card-bg, #1a1a1a);
  display: flex;
  align-items: flex-end;
  padding: 16px;
  transition: opacity var(--ease);
}
.zf-portfolio-card__placeholder-label {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255,255,255,.3);
}
.zf-portfolio-card__body { padding: 20px; flex: 1; }
.zf-portfolio-card__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.zf-portfolio-card__pkg {
  font-size: .625rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}
.zf-portfolio-card__year {
  font-size: .625rem;
  color: var(--c-text-light);
  margin-left: auto;
}
.zf-portfolio-card__title {
  font-size: 1rem;
  font-family: var(--f-heading);
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.3;
}
.zf-portfolio-card__brief {
  font-size: .8125rem;
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

/* ── 11. Process Steps ────────────────────────────────────────────────────── */
.zf-steps {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
}
.zf-step {
  background: var(--c-bg);
  padding: 28px 24px;
  position: relative;
}
.zf-section--alt .zf-step { background: var(--c-bg-alt); }
.zf-step__num {
  display: block;
  font-size: 2rem;
  font-family: var(--f-heading);
  color: var(--c-border);
  font-weight: 700;
  margin-bottom: 12px;
}
.zf-step__title {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}
.zf-step__desc { font-size: .8125rem; color: var(--c-text-muted); line-height: 1.6; }

/* ── 12. Industries Grid ──────────────────────────────────────────────────── */
.zf-industries-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
}
.zf-industry-tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 24px;
  background: var(--c-bg);
  position: relative;
  text-decoration: none;
  transition: background var(--ease);
  overflow: hidden;
}
.zf-industry-tile:hover { background: var(--c-bg-alt); text-decoration: none; }
.zf-industry-tile__label {
  font-size: .9375rem;
  font-weight: 500;
  color: var(--c-text);
  display: block;
}
.zf-industry-tile__count {
  font-size: .75rem;
  color: var(--c-text-muted);
}
.zf-industry-tile__arrow {
  position: absolute;
  top: 24px; right: 24px;
  font-size: 1rem;
  color: var(--c-border);
  transition: color var(--ease), transform var(--ease-out);
}
.zf-industry-tile:hover .zf-industry-tile__arrow {
  color: var(--c-text);
  transform: translateX(4px);
}

/* ── 13. CTA Block ────────────────────────────────────────────────────────── */
.zf-cta-block {
  text-align: center;
  max-width: 580px;
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) 0;
}
.zf-cta-block__label {
  font-size: .6875rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(255,255,255,.5);
  margin-bottom: 12px;
}
.zf-cta-block__title {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  color: #ffffff;
  margin-bottom: 16px;
}
.zf-cta-block__sub {
  font-size: 1rem;
  color: rgba(255,255,255,.65);
  margin-bottom: 32px;
  line-height: 1.6;
}
.zf-cta-block__actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ── 14. Buttons ──────────────────────────────────────────────────────────── */
.zf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-family: var(--f-body);
  font-size: .875rem;
  font-weight: 500;
  line-height: 1.2;
  border-radius: var(--r-sm);
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid transparent;
}
.zf-btn:hover { text-decoration: none; transform: translateY(-1px); }
.zf-btn:active { transform: translateY(0); }

.zf-btn--primary {
  background: var(--c-text);
  color: var(--c-bg);
  border-color: var(--c-text);
}
.zf-btn--primary:hover { background: #333; border-color: #333; }

.zf-btn--ghost {
  background: transparent;
  color: var(--c-text-muted);
  border-color: var(--c-border);
}
.zf-btn--ghost:hover { color: var(--c-text); border-color: var(--c-text); }

.zf-btn--outline {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border);
}
.zf-btn--outline:hover { border-color: var(--c-text); }

.zf-btn--white {
  background: #ffffff;
  color: var(--c-bg-dark);
  border-color: #ffffff;
}
.zf-btn--white:hover { background: rgba(255,255,255,.9); }

.zf-btn--ghost-white {
  background: transparent;
  color: rgba(255,255,255,.8);
  border-color: rgba(255,255,255,.3);
}
.zf-btn--ghost-white:hover { color: #fff; border-color: rgba(255,255,255,.7); }

.zf-btn--sm { padding: 7px 16px; font-size: .8125rem; }
.zf-btn--full { width: 100%; }

/* ── 15. Tags ─────────────────────────────────────────────────────────────── */
.zf-tag {
  display: inline-block;
  font-size: .625rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 3px 10px;
  border: 1px solid var(--c-text);
  border-radius: 20px;
  color: var(--c-text);
}
.zf-tag--light { border-color: var(--c-border); color: var(--c-text-muted); }

/* ── 16. Page Hero ────────────────────────────────────────────────────────── */
.zf-page-hero {
  padding: clamp(40px, 7vw, 84px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 0;
}
.zf-page-hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 16px;
  letter-spacing: -.02em;
}
.zf-page-hero__sub { font-size: 1rem; color: var(--c-text-muted); max-width: 560px; }

/* ── 17. Filter Bar ───────────────────────────────────────────────────────── */
.zf-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 0;
}
.zf-filter-btn {
  padding: 6px 14px;
  font-size: .75rem;
  font-weight: 500;
  border-radius: 20px;
  border: 1px solid var(--c-border);
  color: var(--c-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--ease);
  text-decoration: none;
}
.zf-filter-btn:hover,
.zf-filter-btn.is-active { background: var(--c-text); color: #fff; border-color: var(--c-text); text-decoration: none; }

/* ── 18. Pricing ──────────────────────────────────────────────────────────── */
.zf-pricing-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 20px;
}
.zf-pricing-card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.zf-pricing-card:hover { border-color: var(--c-text); }
.zf-pricing-card--featured {
  border-color: var(--c-text);
  box-shadow: 0 0 0 2px var(--c-text);
}
.zf-pricing-card__badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--c-text);
  color: var(--c-bg);
  font-size: .625rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
}
.zf-pricing-card__name { font-size: 1.0625rem; font-weight: 600; margin-bottom: 8px; }
.zf-pricing-card__price { display: flex; align-items: baseline; gap: 8px; margin-bottom: 8px; }
.zf-pricing-card__price-main { font-size: 2rem; font-family: var(--f-heading); font-weight: 700; }
.zf-pricing-card__price-old {
  font-size: .875rem;
  color: var(--c-text-muted);
  text-decoration: line-through;
}
.zf-pricing-card__desc { font-size: .8125rem; color: var(--c-text-muted); line-height: 1.6; }
.zf-pricing-card__features { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.zf-pricing-card__feature { display: flex; gap: 10px; font-size: .8125rem; }
.zf-pricing-card__check { color: var(--c-text); font-weight: 700; flex-shrink: 0; }

/* ── 19. Add-on Card ──────────────────────────────────────────────────────── */
.zf-addon-card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  padding: 32px;
  align-items: start;
}
.zf-addon-card__title { font-size: 1.125rem; font-weight: 600; margin-bottom: 8px; }
.zf-addon-card__desc { font-size: .875rem; color: var(--c-text-muted); margin-bottom: 16px; line-height: 1.6; }
.zf-addon-card__features { display: flex; flex-direction: column; gap: 4px; }
.zf-addon-card__features li { font-size: .8125rem; color: var(--c-text-muted); }
.zf-addon-card__price { text-align: right; }
.zf-addon-card__price-main {
  display: block;
  font-size: 2rem;
  font-family: var(--f-heading);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 4px;
}
.zf-addon-card__price-old {
  display: block;
  font-size: .875rem;
  color: var(--c-text-muted);
  text-decoration: line-through;
  margin-bottom: 2px;
}
.zf-addon-card__period { font-size: .75rem; color: var(--c-text-muted); }

/* ── 20. FAQ ──────────────────────────────────────────────────────────────── */
.zf-faq { border-top: 1px solid var(--c-border); }
.zf-faq__item { border-bottom: 1px solid var(--c-border); }
.zf-faq__btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 20px 0;
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  color: var(--c-text);
  background: transparent;
  border: none;
  cursor: pointer;
}
.zf-faq__icon { flex-shrink: 0; font-size: 1.25rem; transition: transform var(--ease); }
.zf-faq__btn[aria-expanded="true"] .zf-faq__icon { transform: rotate(45deg); }
.zf-faq__answer { padding: 0 0 20px; }
.zf-faq__answer p { font-size: .9375rem; color: var(--c-text-muted); line-height: 1.7; }

/* ── 21. About Page ───────────────────────────────────────────────────────── */
.zf-about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}
.zf-about-lead {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: 20px;
  font-weight: 400;
}
.zf-about-text p { font-size: .9375rem; color: var(--c-text-muted); line-height: 1.7; margin-bottom: 16px; }
.zf-about-values { display: flex; flex-direction: column; gap: 28px; }
.zf-value-item { border-left: 2px solid var(--c-border); padding-left: 20px; }
.zf-value-item__title { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.zf-value-item__desc { font-size: .875rem; color: var(--c-text-muted); line-height: 1.6; }

.zf-system-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
}
.zf-system-card {
  background: var(--c-bg);
  padding: 24px;
}
.zf-section--alt .zf-system-card { background: var(--c-bg-alt); }
.zf-system-card__num {
  display: block;
  font-size: 1.5rem;
  font-family: var(--f-heading);
  color: var(--c-border);
  margin-bottom: 8px;
}
.zf-system-card__name { font-size: .875rem; font-weight: 600; margin-bottom: 6px; }
.zf-system-card__desc { font-size: .8125rem; color: var(--c-text-muted); line-height: 1.6; }

.zf-tech-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.zf-tech-tag {
  font-size: .8125rem;
  padding: 6px 14px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text-muted);
}

/* ── 22. Contact ──────────────────────────────────────────────────────────── */
.zf-contact-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
  padding: clamp(32px, 5vw, 56px) 0;
}

.zf-form { display: flex; flex-direction: column; gap: 20px; }
.zf-form__row { display: flex; flex-direction: column; gap: 20px; }
.zf-form__row--2col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.zf-form__field { display: flex; flex-direction: column; gap: 6px; }
.zf-form__label {
  font-size: .8125rem;
  font-weight: 500;
  color: var(--c-text);
}
.zf-form__label abbr { text-decoration: none; color: var(--c-text-muted); }
.zf-form__input {
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  font-family: var(--f-body);
  font-size: .9375rem;
  color: var(--c-text);
  background: var(--c-bg);
  transition: border-color var(--ease);
  outline: none;
  appearance: none;
  width: 100%;
}
.zf-form__input:focus { border-color: var(--c-text); }
.zf-form__input::placeholder { color: var(--c-text-light); }
.zf-form__select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4' stroke='%23737373' stroke-width='1.5' fill='none'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; cursor: pointer; }
.zf-form__textarea { resize: vertical; min-height: 140px; }
.zf-form__char-count { font-size: .6875rem; color: var(--c-text-light); text-align: right; }
.zf-form__consent { display: flex; flex-direction: column; gap: 4px; }
.zf-form__checkbox-label {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  font-size: .8125rem;
  color: var(--c-text-muted);
  cursor: pointer;
  align-items: start;
}
.zf-form__checkbox-label input[type="checkbox"] { margin-top: 2px; }
.zf-form__submit { display: flex; flex-direction: column; gap: 8px; }
.zf-form__note { font-size: .75rem; color: var(--c-text-muted); text-align: center; }
.zf-honeypot { display: none !important; }

/* Contact info */
.zf-contact-info { display: flex; flex-direction: column; gap: 16px; }
.zf-contact-info__card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 24px;
}
.zf-contact-info__card--dark {
  background: var(--c-bg-dark);
  border-color: var(--c-bg-dark);
  color: #ffffff;
}
.zf-contact-info__title { font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
.zf-contact-info__list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }
.zf-contact-info__item dt { font-size: .6875rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--c-text-muted); margin-bottom: 2px; }
.zf-contact-info__item dd a { font-size: .875rem; color: var(--c-text); }
.zf-contact-info__hours { border-top: 1px solid var(--c-border); padding-top: 16px; }
.zf-contact-info__hours-title { font-size: .75rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--c-text-muted); margin-bottom: 6px; }
.zf-contact-info__hours p { font-size: .875rem; color: var(--c-text); }
.zf-contact-info__card-label { font-size: .625rem; letter-spacing: .16em; text-transform: uppercase; color: rgba(255,255,255,.5); margin-bottom: 6px; }
.zf-contact-info__card-title { font-size: 1.125rem; font-family: var(--f-heading); font-weight: 600; color: #fff; margin-bottom: 16px; }
.zf-contact-info__card-divider { text-align: center; font-size: .75rem; color: rgba(255,255,255,.3); margin: 10px 0; }

/* ── 23. Alerts ───────────────────────────────────────────────────────────── */
.zf-alert {
  padding: 16px 20px;
  border-radius: var(--r-sm);
  font-size: .9rem;
  margin-bottom: 20px;
}
.zf-alert--success { background: #f0faf4; border: 1px solid #86efac; color: #166534; }
.zf-alert--error { background: #fff5f5; border: 1px solid #fca5a5; color: #991b1b; }
.zf-alert ul { margin-top: 6px; padding-left: 20px; list-style: disc; }
.zf-alert li { margin-top: 2px; }

/* ── 24. 404 ──────────────────────────────────────────────────────────────── */
.zf-404 { display: flex; align-items: center; justify-content: center; min-height: 60vh; }
.zf-404__inner { text-align: center; max-width: 400px; }
.zf-404__code {
  display: block;
  font-family: var(--f-heading);
  font-size: 7rem;
  line-height: 1;
  color: var(--c-border);
  margin-bottom: 12px;
}
.zf-404__title { font-size: 1.5rem; margin-bottom: 12px; }
.zf-404__sub { color: var(--c-text-muted); margin-bottom: 28px; }

/* ── 25. Empty state ──────────────────────────────────────────────────────── */
.zf-empty { grid-column: 1/-1; padding: 64px 0; text-align: center; }
.zf-empty__text { font-size: .9375rem; color: var(--c-text-muted); line-height: 1.7; }

/* ── 26. Footer ───────────────────────────────────────────────────────────── */
.zf-footer {
  border-top: 1px solid var(--c-border);
  padding: clamp(40px, 6vw, 64px) 0 0;
  margin-top: auto;
}
.zf-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.zf-footer__logo { font-weight: 600; font-size: .9375rem; letter-spacing: .04em; display: block; margin-bottom: 8px; }
.zf-footer__tagline { font-size: .8125rem; color: var(--c-text-muted); max-width: 220px; line-height: 1.5; }
.zf-footer__col-title {
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: 12px;
}
.zf-footer__list { display: flex; flex-direction: column; gap: 8px; }
.zf-footer__list a { font-size: .875rem; color: var(--c-text-muted); text-decoration: none; transition: color var(--ease); }
.zf-footer__list a:hover { color: var(--c-text); text-decoration: none; }
.zf-footer__bottom {
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}
.zf-footer__copy, .zf-footer__legal { font-size: .75rem; color: var(--c-text-muted); }
.zf-footer__legal a { color: var(--c-text-muted); text-decoration: none; }
.zf-footer__legal a:hover { color: var(--c-text); }

/* ── 27. Utilities ────────────────────────────────────────────────────────── */
.zf-text-muted { color: var(--c-text-muted); }

/* ════════════════════════════════════════════════════════════════════════════
   RESPONSIVE — Tablet (≤ 1024px)
   ════════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root { --sidebar-w: 200px; }
  .zf-hero { grid-template-columns: 1fr; }
  .zf-hero__visual { display: none; }
  .zf-steps { grid-template-columns: repeat(2,1fr); }
  .zf-industries-grid { grid-template-columns: repeat(2,1fr); }
  .zf-footer__inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .zf-about-grid { grid-template-columns: 1fr; }
  .zf-system-grid { grid-template-columns: repeat(2,1fr); }
  .zf-contact-layout { grid-template-columns: 1fr; }
  .zf-contact-info { flex-direction: row; flex-wrap: wrap; }
  .zf-contact-info__card { flex: 1; min-width: 240px; }
}

/* ════════════════════════════════════════════════════════════════════════════
   RESPONSIVE — Mobile (≤ 768px)
   ════════════════════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  :root { --sidebar-w: 0px; --topbar-h: 48px; }

  /* Sidebar — slideout */
  .zf-sidebar {
    width: 260px;
    transform: translateX(-100%);
    transition: transform var(--ease-out);
    box-shadow: none;
  }
  .zf-sidebar.is-open {
    transform: translateX(0);
    box-shadow: 4px 0 32px rgba(0,0,0,.3);
  }

  /* Hamburger */
  .zf-hamburger { display: flex; }
  .zf-sidebar-overlay.is-open { display: block; }

  /* Main layout */
  .zf-main { margin-left: 0; }
  .zf-topbar { padding-left: calc(var(--topbar-h) + 8px); }
  .zf-content { padding: 0 16px 32px; }

  /* Section header */
  .zf-section__header { grid-template-columns: 32px 1fr; grid-template-rows: auto auto; }
  .zf-section__link { grid-column: 2; }
  .zf-section__num { font-size: 1.75rem; }

  /* Hero */
  .zf-hero { padding: 32px 0 40px; }
  .zf-hero__stats { flex-direction: column; align-items: flex-start; gap: 12px; }
  .zf-hero__stat-divider { width: 40px; height: 1px; }

  /* Grids → single column */
  .zf-portfolio-grid,
  .zf-portfolio-grid--full,
  .zf-steps,
  .zf-industries-grid,
  .zf-system-grid { grid-template-columns: 1fr; }

  .zf-pricing-grid { grid-template-columns: 1fr; }
  .zf-addon-card { grid-template-columns: 1fr; }
  .zf-addon-card__price { text-align: left; }

  .zf-form__row--2col { grid-template-columns: 1fr; }
  .zf-contact-info { flex-direction: column; }

  .zf-footer__inner { grid-template-columns: 1fr; gap: 24px; }
  .zf-footer__bottom { flex-direction: column; text-align: center; }

  .zf-filter-bar { gap: 6px; padding: 12px 0; }
}

/* ════════════════════════════════════════════════════════════════════════════
   Print
   ════════════════════════════════════════════════════════════════════════════ */
@media print {
  .zf-sidebar, .zf-topbar, .zf-hamburger, .zf-cta-block, .zf-footer { display: none !important; }
  .zf-main { margin-left: 0; }
  .zf-content { max-width: 100%; padding: 0; }
}