/* ============================================
   HumanStamp — styles.css
   Mobile-first, no external dependencies
   ============================================ */

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

:root {
  --color-bg:        #ffffff;
  --color-text:      #0F172A;
  --color-text-muted:#475569;
  --color-green:     #22C55E;
  --color-green-dark:#16A34A;
  --color-navy:      #0F172A;
  --color-navy-mid:  #1E293B;
  --color-section:   #F8FAFC;
  --color-border:    #E2E8F0;
  --color-yellow:    #EAB308;
  --color-gray-light:#F1F5F9;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
               sans-serif, "Apple Color Emoji";
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Menlo, Consolas,
               "Courier New", monospace;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  32px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 16px 48px rgba(0,0,0,.12), 0 4px 16px rgba(0,0,0,.06);

  --max-w: 1120px;
  --nav-h: 68px;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ── Layout helpers ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 { font-size: clamp(2.2rem, 5.5vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); font-weight: 750; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 700; }
h4 { font-size: 1rem; font-weight: 700; }

p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 650;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-green);
  color: #fff;
  box-shadow: 0 2px 12px rgba(34, 197, 94, .35);
}

.btn-primary:hover {
  background: var(--color-green-dark);
  box-shadow: 0 4px 20px rgba(34, 197, 94, .45);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  padding: 13px 20px;
}

.btn-ghost:hover {
  color: var(--color-green);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 550;
  transition: color 0.15s;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-sans);
}

.text-link:hover { color: var(--color-text); }

.text-link svg {
  display: inline;
  transition: transform 0.15s;
}

.text-link:hover svg { transform: translateY(2px); }

/* ============================================
   NAV
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-h);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-shield {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav__links {
  display: none;
  align-items: center;
  gap: 4px;
}

.nav__link {
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 550;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-gray-light);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Hamburger */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
  padding: 8px;
}

.nav__hamburger:hover { background: var(--color-gray-light); }

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
  transform-origin: center;
}

.nav__hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 20px 24px;
  z-index: 99;
  box-shadow: var(--shadow-md);
}

.nav__mobile.is-open { display: block; }

.nav__mobile-link {
  display: block;
  padding: 14px 4px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  transition: color 0.15s;
}

.nav__mobile-link:last-of-type { border-bottom: none; }
.nav__mobile-link:hover { color: var(--color-text); }

.nav__mobile-cta {
  margin-top: 16px;
  width: 100%;
  justify-content: center;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  padding: 96px 0 80px;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34,197,94,.1);
  border: 1px solid rgba(34,197,94,.25);
  color: var(--color-green-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero__eyebrow-dot {
  width: 6px;
  height: 6px;
  background: var(--color-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.85); }
}

.hero__h1 {
  margin-bottom: 20px;
}

.hero__h1 em {
  font-style: normal;
  color: var(--color-green);
}

.hero__sub {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 540px;
  margin-bottom: 36px;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

/* iMessage mockup */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.imessage-frame {
  width: 100%;
  max-width: 340px;
  background: #F2F2F7;
  border-radius: 40px;
  padding: 20px 16px 28px;
  box-shadow: var(--shadow-lg);
  position: relative;
  border: 1px solid rgba(0,0,0,.06);
}

.imessage-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 4px 16px;
  border-bottom: 1px solid rgba(0,0,0,.08);
  margin-bottom: 20px;
}

.imessage-avatar {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}

.imessage-contact {
  flex: 1;
}

.imessage-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.imessage-status {
  font-size: 0.72rem;
  color: var(--color-green);
  font-weight: 550;
}

.imessage-messages {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 0 4px;
}

.imessage-row {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.imessage-row.incoming {
  align-items: flex-start;
}

.imessage-bubble {
  max-width: 82%;
  padding: 11px 15px;
  border-radius: 18px;
  font-size: 0.88rem;
  line-height: 1.45;
  font-family: var(--font-sans);
}

.imessage-row.outgoing .imessage-bubble {
  background: #007AFF;
  color: #fff;
  border-bottom-right-radius: 4px;
}

.imessage-row.incoming .imessage-bubble {
  background: #fff;
  color: var(--color-text);
  border-bottom-left-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

/* Stamped message row */
.imessage-stamped-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
}

.imessage-stamp-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(34,197,94,.12);
  border: 1px solid rgba(34,197,94,.3);
  border-radius: 100px;
  padding: 3px 10px 3px 6px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--color-green-dark);
  letter-spacing: 0.02em;
}

.imessage-stamp-badge svg {
  display: inline;
  width: 13px;
  height: 13px;
}

.imessage-time {
  font-size: 0.66rem;
  color: #8E8E93;
  padding: 0 4px;
}

/* Second incoming message (no badge) */
.imessage-row.incoming .imessage-bubble {
  font-style: normal;
}

/* ============================================
   PROBLEM SECTION
   ============================================ */
.problem {
  background: var(--color-section);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.problem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.problem__card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.problem__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.problem__card:first-child::before {
  background: linear-gradient(90deg, #EF4444, #F97316);
}

.problem__card:last-child::before {
  background: linear-gradient(90deg, #8B5CF6, #3B82F6);
}

.problem__icon {
  font-size: 1.6rem;
  margin-bottom: 16px;
  display: block;
}

.problem__card h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.problem__card p {
  font-size: 0.95rem;
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how {
  background: var(--color-bg);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-green-dark);
  margin-bottom: 12px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 520px;
  margin: 0 auto;
}

.how__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  position: relative;
}

.how__step {
  background: var(--color-section);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  transition: box-shadow 0.2s, transform 0.2s;
}

.how__step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.how__step-number {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 28px;
  height: 28px;
  background: var(--color-green);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.how__step-icon {
  font-size: 2rem;
  margin-bottom: 20px;
  display: block;
  line-height: 1;
}

.how__step h3 {
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.how__step p {
  font-size: 0.92rem;
  line-height: 1.65;
}

/* ============================================
   USE CASES
   ============================================ */
.usecases {
  background: var(--color-section);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.usecases__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.usecases__col {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
}

.usecases__col-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.usecases__col-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.usecases__col:first-child .usecases__col-icon {
  background: rgba(34,197,94,.1);
}

.usecases__col:last-child .usecases__col-icon {
  background: rgba(59,130,246,.1);
}

.usecases__col h3 {
  font-size: 1.2rem;
}

.usecases__list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.usecases__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.93rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.usecases__check {
  width: 20px;
  height: 20px;
  background: rgba(34,197,94,.12);
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

.usecases__check svg {
  width: 11px;
  height: 11px;
  stroke: var(--color-green-dark);
  stroke-width: 2.5;
  fill: none;
}

/* ============================================
   SHIELD STATES
   ============================================ */
.shield-section {
  background: var(--color-navy);
  padding: 96px 0;
}

.shield-section .section-label {
  color: rgba(34,197,94,.8);
}

.shield-section .section-header h2 {
  color: #fff;
}

.shield-section .section-header p {
  color: rgba(255,255,255,.55);
}

.shields__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 880px;
  margin: 0 auto;
}

.shield-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  transition: background 0.2s, border-color 0.2s;
}

.shield-card:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.18);
}

.shield-card__icon {
  margin: 0 auto 20px;
  width: 64px;
  height: 64px;
}

.shield-card__title {
  font-size: 1.05rem;
  font-weight: 750;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.shield-card__sub {
  font-size: 0.85rem;
  color: rgba(255,255,255,.5);
  line-height: 1.55;
}

.shield-card__level {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.shield-card--green .shield-card__level {
  background: rgba(34,197,94,.2);
  color: #4ADE80;
}

.shield-card--yellow .shield-card__level {
  background: rgba(234,179,8,.2);
  color: #FDE047;
}

.shield-card--gray .shield-card__level {
  background: rgba(148,163,184,.15);
  color: #94A3B8;
}

/* ============================================
   DEVELOPERS
   ============================================ */
.developers {
  background: var(--color-bg);
}

.developers__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: center;
}

.developers__copy h2 {
  margin-bottom: 16px;
}

.developers__copy p {
  font-size: 1rem;
  margin-bottom: 28px;
  max-width: 460px;
}

.code-block {
  background: var(--color-navy);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  font-family: var(--font-mono);
}

.code-block__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.code-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.code-dot:nth-child(1) { background: #FF5F57; }
.code-dot:nth-child(2) { background: #FFBD2E; }
.code-dot:nth-child(3) { background: #28CA41; }

.code-label {
  margin-left: 6px;
  font-size: 0.72rem;
  color: rgba(255,255,255,.35);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.code-block__body {
  padding: 24px 20px;
  overflow-x: auto;
}

.code-block__body pre {
  font-size: 0.82rem;
  line-height: 1.8;
  color: #E2E8F0;
  white-space: pre;
  tab-size: 2;
}

.code-comment { color: #64748B; }
.code-method  { color: #FB923C; font-weight: 600; }
.code-path    { color: #A5F3FC; }
.code-key     { color: #A78BFA; }
.code-string  { color: #86EFAC; }
.code-arrow   { color: #FDE68A; }
.code-result  { color: #34D399; font-weight: 600; }

.dev-features {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.dev-tag {
  background: var(--color-gray-light);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ============================================
   WAITLIST
   ============================================ */
.waitlist {
  background: var(--color-navy);
  padding: 100px 0;
}

.waitlist__inner {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.waitlist__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34,197,94,.15);
  border: 1px solid rgba(34,197,94,.3);
  color: #4ADE80;
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.waitlist h2 {
  color: #fff;
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: 16px;
  letter-spacing: -0.04em;
}

.waitlist__sub {
  color: rgba(255,255,255,.6);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 40px;
}

.waitlist__form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.waitlist__input {
  width: 100%;
  padding: 16px 20px;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 100px;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

.waitlist__input::placeholder {
  color: rgba(255,255,255,.35);
}

.waitlist__input:focus {
  border-color: var(--color-green);
  background: rgba(255,255,255,.1);
}

.waitlist__submit {
  width: 100%;
  padding: 16px;
  background: var(--color-green);
  color: #fff;
  border: none;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 2px 16px rgba(34,197,94,.35);
}

.waitlist__submit:hover {
  background: var(--color-green-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(34,197,94,.45);
}

.waitlist__submit:active { transform: scale(0.98); }

.waitlist__fine {
  margin-top: 20px;
  font-size: 0.8rem;
  color: rgba(255,255,255,.3);
  line-height: 1.6;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-navy-mid);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 52px 0 40px;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 750;
  color: #fff;
  letter-spacing: -0.02em;
}

.footer__logo-shield {
  width: 28px;
  height: 28px;
}

.footer__tagline {
  font-size: 0.85rem;
  color: rgba(255,255,255,.4);
  line-height: 1.5;
  max-width: 260px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
}

.footer__link {
  font-size: 0.85rem;
  color: rgba(255,255,255,.4);
  transition: color 0.15s;
}

.footer__link:hover { color: rgba(255,255,255,.75); }
.footer__link--soon {
  cursor: default;
  opacity: .35;
}
.footer__link--soon:hover { color: inherit; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.footer__copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,.3);
}

/* ============================================
   RESPONSIVE — tablet (640px+)
   ============================================ */
@media (min-width: 640px) {
  .problem__grid {
    grid-template-columns: 1fr 1fr;
  }

  .usecases__grid {
    grid-template-columns: 1fr 1fr;
  }

  .shields__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .waitlist__form {
    flex-direction: row;
  }

  .waitlist__input {
    flex: 1;
    min-width: 0;
  }

  .waitlist__submit {
    width: auto;
    padding: 16px 28px;
    white-space: nowrap;
  }

  .footer__inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}

/* ============================================
   RESPONSIVE — desktop (900px+)
   ============================================ */
@media (min-width: 900px) {
  .nav__links {
    display: flex;
  }

  .nav__hamburger {
    display: none;
  }

  .hero {
    padding: 120px 0 100px;
  }

  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }

  .hero__sub {
    font-size: 1.15rem;
  }

  .how__steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .developers__inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr 1fr;
    align-items: start;
    gap: 40px;
  }

  .imessage-frame {
    max-width: 360px;
  }
}

/* ============================================
   RESPONSIVE — large (1200px+)
   ============================================ */
@media (min-width: 1200px) {
  .container {
    padding: 0 32px;
  }
}

/* ── Utilities ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}