/* =========================================================================
   레이의 레버리지 — Components & Layout  (Better Stack — Midnight SRE console)
   Depends on tokens.css.
   규칙: 다크 캔버스 / 보더로 형태 정의 / 드롭섀도 금지(inset 하이라이트만) /
         그래디언트는 Primary CTA 1곳 / periwinkle은 링크·액센트만 /
         라운드 카드16·버튼9999·입력10 / 텍스트 화이트·frost·muted만. 폰트 Noto Sans.
   ========================================================================= */

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-noto);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  letter-spacing: var(--tracking-body);
  font-weight: var(--fw-regular);
  color: var(--text-primary);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::placeholder { color: var(--color-muted-steel); }
::selection { background: rgba(152, 164, 247, 0.3); color: #fff; }

:focus-visible {
  outline: 2px solid var(--color-periwinkle-glow);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* 다크 전환: 잔존 라이트 장식 마크업 차단 */
.deco, .hero-visual { display: none !important; }

/* ---------- Typography ---------- */
.font-display { font-family: var(--font-noto); }

h1, h2, h3, h4 {
  font-family: var(--font-noto);
  font-weight: var(--fw-medium);          /* 헤드라인 500 */
  color: var(--text-primary);
  margin: 0;
  letter-spacing: var(--tracking-heading);
  line-height: 1.15;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-noto);
  font-size: var(--text-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted-steel);
}

.lead {
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--text-secondary);
  font-weight: var(--fw-regular);
}

.muted { color: var(--text-tertiary); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section { padding-block: var(--section-gap); }
.section--tight { padding-block: var(--spacing-48); }
.section--surface-1,
.section--surface-2,
.section--ivory { background: var(--bg-surface-1); }

.section-header { max-width: 780px; margin-bottom: var(--spacing-48); }
.section-header.center { margin-inline: auto; text-align: center; }
.section-header h2 {
  font-size: var(--text-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin-top: var(--spacing-16);
}
.section-header p {
  margin-top: var(--spacing-16);
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--text-secondary);
}
.section-header__icon { display: none; }

.section--pagehero { text-align: center; }
.section--pagehero .container > * { margin-inline: auto; }
.section--pagehero .lead { max-width: 680px; }

.grid { display: grid; gap: var(--element-gap); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Buttons ---------- */
/* Primary = 바이올렛-블루 그래디언트 pill (유일 채색 + inset rim) */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-8);
  font-family: var(--font-noto);
  font-size: var(--text-body);
  line-height: 1.4;
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-body);
  padding: 11px 24px;
  border-radius: var(--radius-pill);
  background: var(--gradient-iris);
  border: none;
  color: var(--color-pure-white);
  box-shadow: var(--shadow-inset-rim);
  transition: filter .16s ease, transform .16s ease;
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn .arrow { transition: transform .18s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* Secondary = 아웃라인 pill */
.btn--ghost {
  background: transparent;
  border: 1px solid var(--color-steel-border);
  color: var(--color-frost);
  box-shadow: none;
}
.btn--ghost:hover { background: rgba(147, 157, 184, 0.1); color: var(--color-pure-white); }

/* 텍스트 링크 */
.btn--quiet {
  background: transparent;
  border: none;
  color: var(--color-periwinkle-glow);
  padding: 6px 2px;
  border-radius: 0;
  box-shadow: none;
}
.btn--quiet:hover { background: transparent; text-decoration: underline; text-underline-offset: 4px; }

.btn-row { display: flex; flex-wrap: wrap; gap: var(--spacing-16); align-items: center; }

/* ---------- Badges / chips ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-body-sm);
  font-weight: var(--fw-medium);
  letter-spacing: -0.01em;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-carbon-surface);
  border: 1px solid var(--color-gunmetal);
  color: var(--text-secondary);
}
.badge--dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-periwinkle-glow); }
.badge--live { border-color: var(--color-periwinkle-glow); color: var(--color-periwinkle-glow); }
.badge--beta { border-color: var(--color-steel-border); color: var(--color-frost); }
.badge--dev  { border-color: var(--color-gunmetal); color: var(--text-tertiary); }
.badge--done { background: var(--gradient-iris); border-color: transparent; color: #fff; box-shadow: var(--shadow-inset-rim); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 16, 26, 0.85);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-gunmetal);
  box-shadow: var(--shadow-inset-rim);
}
.site-header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-20);
}
.brand {
  font-family: var(--font-noto);
  font-weight: var(--fw-medium);
  font-size: var(--text-subheading);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-pure-white);
}
/* 브랜드 마크 = iris 그래디언트 큐브 */
.brand__mark {
  width: 24px; height: 24px; border-radius: 7px;
  background: var(--gradient-iris);
  box-shadow: var(--shadow-inset-rim);
}
.brand__mark::after { content: none; }

.nav { display: flex; align-items: center; gap: var(--spacing-24); }
.nav__link {
  font-size: var(--text-body-sm);
  color: var(--color-muted-steel);
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav__link:hover { color: var(--color-frost); }
.nav__link[aria-current="page"] { color: var(--color-pure-white); border-bottom-color: var(--color-periwinkle-glow); }

.header-cta { display: flex; align-items: center; gap: var(--spacing-12); }
.header-cta .btn { padding: 9px 18px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  border: 1px solid var(--color-gunmetal);
  border-radius: var(--radius-nav);
  background: var(--color-carbon-surface);
}
.nav-toggle span { display: block; height: 2px; width: 18px; margin-inline: auto; background: var(--color-frost); }

/* ---------- Hero (centered, dark) ---------- */
.hero { padding-block: var(--spacing-100) var(--spacing-80); text-align: center; }
.hero__grid { display: block; max-width: 900px; margin-inline: auto; }
.hero__badges { display: flex; flex-wrap: wrap; gap: var(--spacing-8); justify-content: center; margin-bottom: var(--spacing-25); }
.hero h1 {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  font-weight: var(--fw-medium);
  color: var(--color-pure-white);
}
.hero h1 .accent {
  background: var(--gradient-iris);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__sub {
  margin: var(--spacing-25) auto 0;
  font-size: var(--text-subheading);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--text-secondary);
  max-width: 640px;
}
.hero__cta { margin-top: var(--spacing-32); justify-content: center; }

/* ---------- Logo / proof strip ---------- */
.logostrip {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: var(--spacing-40);
  padding-block: var(--spacing-40);
  border-block: 1px solid var(--color-gunmetal);
}
.logostrip span {
  font-size: var(--text-body-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted-steel);
}

/* ---------- Metrics ---------- */
.metrics { border-block: 1px solid var(--color-gunmetal); }
.metric { padding: var(--spacing-20) 0; }
.metric__num {
  font-family: var(--font-noto);
  font-size: var(--text-heading-lg);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-heading-lg);
  color: var(--color-pure-white);
}
.metric__num .unit { color: var(--color-periwinkle-glow); }
.metric__label { color: var(--text-secondary); font-size: var(--text-body-sm); margin-top: 6px; }

/* ---------- Generic Card (carbon + gunmetal border, r16) ---------- */
.card {
  background: var(--color-carbon-surface);
  border: 1px solid var(--color-gunmetal);
  border-radius: var(--radius-card);
  padding: var(--card-padding);
  transition: border-color .18s ease;
}
.card:hover { border-color: var(--color-steel-border); }
.card h3 { font-size: var(--text-heading-sm); line-height: var(--leading-heading-sm); letter-spacing: var(--tracking-heading-sm); }
.card--surface { background: #181a28; }
.card p { color: var(--text-secondary); }
.card__num { font-size: var(--text-subheading); color: var(--color-muted-steel); font-weight: var(--fw-medium); }
.card__title { font-size: var(--text-heading-sm); font-weight: var(--fw-medium); letter-spacing: var(--tracking-heading-sm); margin-top: var(--spacing-12); color: var(--color-pure-white); }
.card__body { margin-top: var(--spacing-12); }
.card__head { display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-12); }

.icon-chip {
  width: 44px; height: 44px; border-radius: var(--radius-nav);
  display: grid; place-items: center;
  background: var(--color-void-black); color: var(--color-frost);
  border: 1px solid var(--color-gunmetal);
  font-size: 20px; margin-bottom: var(--spacing-20);
}

/* ---------- Story Timeline ---------- */
.timeline { position: relative; display: grid; gap: var(--spacing-30); }
.timeline::before { content: ""; position: absolute; left: 19px; top: 8px; bottom: 8px; width: 1px; background: var(--color-gunmetal); }
.tl-item { position: relative; padding-left: 56px; }
.tl-item__dot {
  position: absolute; left: 10px; top: 4px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--color-carbon-surface); border: 1px solid var(--color-steel-border);
  display: grid; place-items: center;
}
.tl-item__dot::after { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--color-periwinkle-glow); }
.tl-item__step { font-size: var(--text-body-sm); letter-spacing: 0.04em; text-transform: uppercase; color: var(--color-muted-steel); }
.tl-item__title { font-size: var(--text-subheading); font-weight: var(--fw-medium); margin: 6px 0 8px; color: var(--color-pure-white); }
.tl-item__body { color: var(--text-secondary); }

/* ---------- Tech / capability grid ---------- */
.tech-card { background: var(--color-carbon-surface); border: 1px solid var(--color-gunmetal); border-radius: var(--radius-card); padding: var(--card-padding); }
.tech-card h3 { font-size: var(--text-subheading); font-weight: var(--fw-medium); color: var(--color-pure-white); }
.tech-card ul { margin-top: var(--spacing-16); display: grid; gap: var(--spacing-8); }
.tech-card li { position: relative; padding-left: 18px; color: var(--text-secondary); font-size: var(--text-body); }
.tech-card li::before { content: ""; position: absolute; left: 0; top: 11px; width: 5px; height: 5px; background: var(--color-muted-steel); border-radius: 50%; }

/* ---------- Software card ---------- */
.sw-card { display: flex; flex-direction: column; gap: var(--spacing-16); }
.sw-card .feat { display: grid; gap: var(--spacing-8); }
.sw-card .feat li { position: relative; padding-left: 20px; color: var(--text-secondary); font-size: var(--text-body); }
.sw-card .feat li::before { content: "→"; position: absolute; left: 0; top: 0; color: var(--color-periwinkle-glow); }
.sw-card .meta { display: flex; justify-content: space-between; align-items: center; padding-top: var(--spacing-16); border-top: 1px solid var(--color-gunmetal); margin-top: auto; }

/* ---------- Lecture card ---------- */
.lecture-card { display: flex; flex-direction: column; }
.lecture-card .outcome { font-size: var(--text-subheading); font-weight: var(--fw-medium); line-height: 1.35; margin-bottom: var(--spacing-12); color: var(--color-pure-white); }
.lecture-card .for-who { color: var(--color-muted-steel); font-size: var(--text-body-sm); margin-bottom: var(--spacing-20); }
.lecture-card .curriculum { counter-reset: c; display: grid; gap: var(--spacing-8); margin: var(--spacing-8) 0 var(--spacing-24); }
.lecture-card .curriculum li { position: relative; padding-left: 26px; color: var(--text-secondary); font-size: var(--text-body); }
.lecture-card .curriculum li::before {
  counter-increment: c; content: counter(c);
  position: absolute; left: 0; top: 1px; font-size: 11px;
  width: 18px; height: 18px; border-radius: 50%; background: var(--color-void-black);
  color: var(--color-frost); border: 1px solid var(--color-gunmetal); display: grid; place-items: center;
}
.lecture-card .price { font-size: var(--text-heading-sm); font-weight: var(--fw-medium); color: var(--color-pure-white); }
.lecture-card .price small { font-size: 13px; color: var(--color-muted-steel); font-weight: var(--fw-regular); }
.lecture-card .cta-row { margin-top: auto; padding-top: var(--spacing-20); display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-16); }

/* ---------- Process steps ---------- */
.steps { counter-reset: s; display: grid; gap: var(--spacing-20); }
.step { position: relative; padding-left: 60px; }
.step::before {
  counter-increment: s; content: counter(s);
  position: absolute; left: 0; top: 0;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--color-steel-border); color: var(--color-frost);
  font-size: 16px; font-weight: var(--fw-medium);
  display: grid; place-items: center; background: var(--color-carbon-surface);
}
.step h3 { font-size: var(--text-subheading); font-weight: var(--fw-medium); color: var(--color-pure-white); }
.step p { color: var(--text-secondary); margin-top: 6px; }

/* ---------- FAQ accordion ---------- */
.faq { display: grid; max-width: 800px; }
.faq__item { border-bottom: 1px solid var(--color-gunmetal); background: transparent; }
.faq__q {
  width: 100%; text-align: left; background: transparent; border: none;
  padding: var(--spacing-20) 0;
  font-size: var(--text-subheading); font-weight: var(--fw-medium); color: var(--color-pure-white);
  display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-16);
}
.faq__q .ico { color: var(--color-periwinkle-glow); transition: transform .2s ease; flex: none; font-size: 24px; line-height: 1; }
.faq__item.open .faq__q .ico { transform: rotate(45deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.faq__a p { padding: 0 0 var(--spacing-20); color: var(--text-secondary); margin: 0; }

/* ---------- Channel links ---------- */
.channels { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--element-gap); }
.channel {
  display: flex; flex-direction: column; gap: 8px;
  padding: var(--card-padding); background: var(--color-carbon-surface);
  border: 1px solid var(--color-gunmetal); border-radius: var(--radius-card);
  transition: border-color .18s ease, transform .18s ease;
}
.channel:hover { border-color: var(--color-steel-border); transform: translateY(-2px); }
.channel__name { display: flex; align-items: center; gap: 8px; font-size: var(--text-subheading); font-weight: var(--fw-medium); color: var(--color-pure-white); }
.channel__role { color: var(--color-muted-steel); font-size: var(--text-body-sm); }
.channel__cta { margin-top: 4px; font-size: var(--text-body-sm); color: var(--color-periwinkle-glow); }

/* ---------- Announcement pill ---------- */
.announce {
  display: inline-flex; align-items: center; gap: var(--spacing-12); flex-wrap: wrap;
  padding: 8px 16px;
  background: var(--color-carbon-surface); color: var(--color-periwinkle-glow);
  border: 1px solid var(--color-gunmetal);
  border-radius: var(--radius-pill);
}
.announce__text { font-size: var(--text-body-sm); color: var(--color-frost); }
.announce__text strong { color: var(--color-periwinkle-glow); font-weight: var(--fw-medium); }
.announce a { color: var(--color-periwinkle-glow); border-bottom: 1px solid var(--color-periwinkle-glow); padding-bottom: 1px; font-size: var(--text-body-sm); }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band h2 { font-size: var(--text-heading-lg); line-height: var(--leading-heading-lg); letter-spacing: var(--tracking-heading-lg); color: var(--color-pure-white); }
.cta-band p { margin: var(--spacing-16) auto 0; max-width: 560px; color: var(--text-secondary); font-size: var(--text-subheading); letter-spacing: var(--tracking-subheading); }
.cta-band .btn-row { justify-content: center; margin-top: var(--spacing-32); }

/* ---------- Forms ---------- */
.form { display: grid; gap: var(--spacing-20); max-width: 640px; }
.field { display: grid; gap: 8px; }
.field label { font-size: var(--text-body-sm); color: var(--color-frost); }
.field .req { color: var(--color-periwinkle-glow); }
.field input,
.field textarea,
.field select {
  font-family: var(--font-noto); font-size: var(--text-body); color: var(--color-pure-white);
  padding: 12px 16px; background: var(--color-void-black);
  border: 1px solid var(--color-gunmetal); border-radius: var(--radius-input);
  transition: border-color .15s ease;
}
.field select { color: var(--color-frost); }
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus,
.field textarea:focus,
.field select:focus { outline: none; border-color: var(--color-periwinkle-glow); }
.field--inline { display: flex; align-items: flex-start; gap: 10px; }
.field--inline input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--color-iris-blue); }
.field--inline label { color: var(--text-secondary); font-size: var(--text-body-sm); }
.field--inline a { color: var(--color-periwinkle-glow); border-bottom: 1px solid var(--color-periwinkle-glow); }
.form__note { font-size: var(--text-body-sm); color: var(--color-muted-steel); }
.form__status {
  display: none; padding: var(--spacing-16) var(--spacing-20);
  border-radius: var(--radius-card); background: var(--color-carbon-surface); border: 1px solid var(--color-periwinkle-glow);
  font-size: var(--text-body-sm); color: var(--color-frost);
}
.form__status.show { display: block; }
.form__status strong { color: var(--color-periwinkle-glow); font-weight: var(--fw-medium); }

/* contact split layout */
.contact-grid { display: grid; grid-template-columns: 1fr 0.8fr; gap: var(--spacing-48); align-items: start; }
.contact-aside { display: grid; gap: var(--spacing-20); }
.contact-aside .info { display: grid; gap: 4px; }
.contact-aside .info .k { font-size: var(--text-body-sm); letter-spacing: 0.04em; text-transform: uppercase; color: var(--color-muted-steel); }
.contact-aside .info .v { color: var(--color-pure-white); }

/* ---------- Footer (dark) ---------- */
.site-footer {
  background: var(--color-void-black);
  color: var(--text-secondary);
  border-top: 1px solid var(--color-gunmetal);
  padding-block: var(--spacing-60) var(--spacing-40);
}
.site-footer .brand { color: var(--color-pure-white); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: var(--spacing-48); }
.footer-brand .slogan { color: var(--color-muted-steel); margin-top: var(--spacing-16); max-width: 34ch; font-size: var(--text-body-sm); }
.footer-col h4 { font-size: var(--text-body-sm); text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-muted-steel); margin-bottom: var(--spacing-16); font-weight: var(--fw-medium); }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-secondary); font-size: var(--text-body-sm); }
.footer-col a:hover { color: var(--color-periwinkle-glow); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--spacing-12); margin-top: var(--spacing-48); padding-top: var(--spacing-20); border-top: 1px solid var(--color-gunmetal); font-size: var(--text-body-sm); color: var(--color-muted-steel); }

/* ---------- Tab Strip ---------- */
.tabstrip {
  display: flex; flex-wrap: wrap; gap: var(--spacing-30);
  border-bottom: 1px solid var(--color-gunmetal);
  margin-bottom: var(--spacing-40);
}
.tab {
  font-family: var(--font-noto); font-size: var(--text-body); font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-body);
  color: var(--color-muted-steel); background: transparent;
  border: none; border-bottom: 2px solid transparent; border-radius: 0;
  padding: 0 0 12px; margin-bottom: -1px;
  transition: color .15s ease, border-color .15s ease;
}
.tab:hover { color: var(--color-frost); }
.tab[aria-selected="true"] { color: var(--color-pure-white); border-bottom-color: var(--color-periwinkle-glow); }
.tabpanel { display: none; }
.tabpanel.active { display: block; }

/* ---------- Course PART cards ---------- */
.partcard { display: flex; flex-direction: column; }
.partcard .icon-chip { width: 48px; height: 48px; margin-bottom: var(--spacing-20); }
.partcard .icon-chip svg { width: 22px; height: 22px; }
.partcard h3 { font-size: var(--text-heading-sm); letter-spacing: var(--tracking-heading-sm); color: var(--color-pure-white); }
.partcard p { margin-top: var(--spacing-12); }
.bullets { display: grid; gap: var(--spacing-10); margin-top: var(--spacing-20); }
.bullets li { position: relative; padding-left: 16px; color: var(--text-secondary); font-size: var(--text-body); }
.bullets li::before { content: ""; position: absolute; left: 0; top: 11px; width: 5px; height: 5px; border-radius: 50%; background: var(--color-periwinkle-glow); }
.bullets--2col { grid-template-columns: 1fr 1fr; column-gap: var(--spacing-32); }
@media (max-width: 560px) { .bullets--2col { grid-template-columns: 1fr; } }

/* ---------- Utilities ---------- */
.mt-8 { margin-top: var(--spacing-8); }
.mt-16 { margin-top: var(--spacing-16); }
.mt-24 { margin-top: var(--spacing-24); }
.mt-40 { margin-top: var(--spacing-40); }
.center { text-align: center; }
.hidden { display: none !important; }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 1024px) {
  :root { --text-display: 44px; --text-heading-lg: 36px; --text-heading: 30px; --section-gap: 64px; }
}

@media (max-width: 860px) {
  .nav, .header-cta .btn { display: none; }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }

  .site-header.open .nav {
    display: flex; flex-direction: column; align-items: flex-start;
    position: absolute; left: 0; right: 0; top: var(--header-h);
    background: var(--color-void-black); border-bottom: 1px solid var(--color-gunmetal);
    padding: var(--spacing-20) var(--container-pad); gap: var(--spacing-16);
  }
  .site-header.open .nav__link { font-size: var(--text-subheading); }
  .site-header.open .header-cta { display: flex; padding: 0 var(--container-pad) var(--spacing-20); gap: var(--spacing-12); }
  .site-header.open .header-cta .btn { display: inline-flex; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .channels { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .logostrip { gap: var(--spacing-25); }
}

@media (max-width: 560px) {
  :root { --text-display: 34px; --text-heading-lg: 30px; --text-heading: 26px; --text-heading-sm: 24px; --section-gap: 56px; --container-pad: 18px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .channels { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .btn-row { width: 100%; }
  .btn-row .btn { flex: 1 1 auto; justify-content: center; }
  .footer-bottom { flex-direction: column; }
  .tabstrip { gap: var(--spacing-20); }
}