/* ============================================================
   SeniorTechSafety — Stylesheet
   Stack: Vanilla HTML / CSS / JS
   Audience: Seniors — accessible, high-contrast, large type
   ============================================================ */

/* 1. CUSTOM PROPERTIES */
:root {
  --blue:         #4287F5;
  --blue-dark:    #0C5DDE;
  --blue-light:   #7DADF8;
  --blue-bg:      #F0F5FE;
  --navy:         #020C1E;
  --dark:         #1B2534;
  --gray:         #424242;
  --gray-light:   #D9D9D9;
  --white:        #FFFFFF;

  --color-text:        var(--dark);
  --color-text-muted:  #5a6478;
  --color-bg:          var(--white);
  --color-bg-alt:      var(--blue-bg);
  --color-border:      #e0e8f7;
  --color-primary:     var(--blue);
  --color-primary-dk:  var(--blue-dark);

  --font-heading: 'Fira Sans', system-ui, sans-serif;
  --font-body:    'DM Sans',   system-ui, sans-serif;

  --text-xs:   0.875rem;
  --text-sm:   1rem;
  --text-base: 1.125rem;   /* 18px — senior-accessible minimum */
  --text-lg:   1.25rem;
  --text-xl:   1.5rem;
  --text-2xl:  2rem;
  --text-3xl:  2.5rem;
  --text-4xl:  3rem;
  --text-5xl:  3.75rem;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  --max-width:     1140px;
  --radius-sm:     8px;
  --radius-md:     12px;
  --radius-lg:     20px;
  --radius-full:   9999px;

  --shadow-sm:   0 1px 3px  rgba(2,12,30,.08);
  --shadow-md:   0 4px 16px rgba(2,12,30,.10);
  --shadow-lg:   0 8px 32px rgba(2,12,30,.14);
  --shadow-blue: 0 4px 20px rgba(66,135,245,.30);

  --transition: .25s ease;
}

/* 2. RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img  { display: block; max-width: 100%; height: auto; }
ul   { list-style: none; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-dk); }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 3. TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
}

h1 { font-size: clamp(var(--text-3xl), 5vw,   var(--text-5xl)); }
h2 { font-size: clamp(var(--text-2xl), 4vw,   var(--text-4xl)); }
h3 { font-size: clamp(var(--text-xl),  3vw,   var(--text-3xl)); }
h4 { font-size: clamp(var(--text-lg),  2.5vw, var(--text-2xl)); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

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

/* 4. LAYOUT */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section          { padding-block: var(--space-3xl); }
.section--alt     { background-color: var(--color-bg-alt); }

.section__header {
  text-align: center;
  max-width: 700px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.section__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue);
  background: rgba(66,135,245,.10);
  padding: .3em 1em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
}

.section__title    { margin-bottom: var(--space-sm); }
.section__subtitle { color: var(--color-text-muted); font-size: var(--text-lg); }

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

/* 5. SKIP LINK */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  background: var(--blue);
  color: #fff;
  padding: .75em 1.5em;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  transition: top .2s;
}
.skip-link:focus { top: 0; color: #fff; }

/* 6. NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: var(--shadow-md);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-lg);
}

.nav__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav__brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--white);
  line-height: 1;
}

.nav__brand-tag {
  font-size: .75rem;
  color: var(--blue-light);
  letter-spacing: .04em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,.80);
  padding: .45em .9em;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}

.nav__link:hover,
.nav__link.active {
  color: var(--white);
  background: rgba(255,255,255,.10);
}

.nav__link--cta {
  background: var(--blue);
  color: var(--white) !important;
  padding: .5em 1.2em;
  border-radius: var(--radius-full);
}

.nav__link--cta:hover {
  background: var(--blue-dark) !important;
  color: var(--white) !important;
}

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav__toggle:hover { background: rgba(255,255,255,.10); }

.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none;
  flex-direction: column;
  background: var(--navy);
  padding: var(--space-sm) var(--space-lg) var(--space-md);
  border-top: 1px solid rgba(255,255,255,.10);
  gap: 4px;
}

.nav__mobile.open { display: flex; }

.nav__mobile .nav__link {
  padding: .75em 1em;
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
}

/* 7. HERO */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, #0d2044 55%, #091525 100%);
  min-height: 88vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(66,135,245,.18) 0%, transparent 65%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: 680px;
  padding-block: var(--space-3xl);
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--blue-light);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.hero__tag::before {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  background: var(--blue);
  border-radius: 50%;
}

.hero h1  { color: var(--white); margin-bottom: var(--space-md); }

.hero__subtitle {
  font-size: var(--text-lg);
  color: rgba(255,255,255,.72);
  margin-bottom: var(--space-xl);
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* 8. BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1;
  padding: .9em 2em;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  min-height: 52px;
  white-space: nowrap;
}

.btn--primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
  box-shadow: var(--shadow-blue);
}

.btn--primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(66,135,245,.40);
}

.btn--outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.40);
}

.btn--outline:hover {
  background: rgba(255,255,255,.10);
  border-color: rgba(255,255,255,.80);
  color: var(--white);
}

.btn--outline-blue {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}

.btn--outline-blue:hover {
  background: var(--blue);
  color: var(--white);
}

.btn--lg {
  font-size: var(--text-lg);
  padding: 1em 2.4em;
  min-height: 60px;
}

.btn svg { width: 1.1em; height: 1.1em; flex-shrink: 0; }

/* 9. SPLIT / ABOUT */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.split__img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: auto;
  display: block;
}

.split__content h2 { margin-bottom: var(--space-sm); }
.split__content h3 { margin-bottom: var(--space-sm); }
.split__content p  { color: var(--color-text-muted); margin-bottom: var(--space-md); }

/* 10. FEATURE CARDS */
.feature-card {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--blue-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--blue);
}

.feature-card__icon svg { width: 28px; height: 28px; }

.feature-card__title { font-size: var(--text-xl); margin-bottom: var(--space-xs); }
.feature-card__text  { color: var(--color-text-muted); line-height: 1.65; }

/* 11. SAFETY CARDS */
.safety-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  border-left: 4px solid var(--blue);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.safety-card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: .6em;
}

.safety-card__text { color: var(--color-text-muted); margin-bottom: var(--space-md); }

.safety-card__link {
  font-weight: 600;
  font-size: var(--text-sm);
  display: inline-flex;
  align-items: center;
  gap: .4em;
  color: var(--blue);
  transition: gap var(--transition);
}

.safety-card__link:hover { gap: .7em; color: var(--blue-dark); }

/* 12. VIDEO CARDS */
.video-card {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  display: block;
  color: inherit;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.video-card__thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--navy);
  transition: transform .4s ease;
}

.video-card:hover .video-card__thumb img { transform: scale(1.05); }

.video-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(2,12,30,.30);
  transition: background var(--transition);
}

.video-card:hover .video-card__play { background: rgba(2,12,30,.50); }

.video-card__play-icon {
  width: 52px;
  height: 52px;
  background: var(--blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-blue);
  transition: transform var(--transition);
}

.video-card:hover .video-card__play-icon { transform: scale(1.1); }

.video-card__play-icon svg {
  width: 20px;
  height: 20px;
  color: #fff;
  margin-left: 3px;
}

.video-card__body  { padding: var(--space-md); }

.video-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--navy);
  line-height: 1.4;
  margin-bottom: var(--space-xs);
}

.video-card__desc  { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.5; }

/* 13. NEWSLETTER */
.newsletter {
  background: linear-gradient(135deg, var(--navy) 0%, #0d2044 100%);
  padding-block: var(--space-3xl);
  text-align: center;
}

.newsletter__title    { color: var(--white); margin-bottom: var(--space-sm); }
.newsletter__subtitle { color: rgba(255,255,255,.70); font-size: var(--text-lg); margin-bottom: var(--space-xl); }

.newsletter__form {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  max-width: 520px;
  margin-inline: auto;
}

.newsletter__input {
  flex: 1;
  min-width: 240px;
  padding: .9em 1.4em;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255,255,255,.20);
  background: rgba(255,255,255,.10);
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--text-base);
  min-height: 52px;
  transition: border-color var(--transition), background var(--transition);
}

.newsletter__input::placeholder { color: rgba(255,255,255,.45); }

.newsletter__input:focus {
  outline: none;
  border-color: var(--blue-light);
  background: rgba(255,255,255,.15);
}

/* 14. FOOTER */
.footer {
  background: var(--navy);
  padding-block: var(--space-3xl) var(--space-xl);
  color: rgba(255,255,255,.70);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand-name { font-family: var(--font-heading); font-size: var(--text-xl); font-weight: 700; color: var(--white); margin-bottom: 4px; }
.footer__brand-tag  { font-size: var(--text-xs); color: var(--blue-light); margin-bottom: var(--space-md); letter-spacing: .04em; }

.footer__brand-desc {
  font-size: var(--text-sm);
  line-height: 1.75;
  max-width: 300px;
  margin-bottom: var(--space-md);
  color: rgba(255,255,255,.60);
}

.footer__socials { display: flex; gap: .75rem; }

.footer__social-link {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,.10);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.65);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}

.footer__social-link:hover { background: var(--blue); color: var(--white); }
.footer__social-link svg   { width: 18px; height: 18px; }

.footer__col-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--white);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.footer__links { display: flex; flex-direction: column; gap: .6rem; }

.footer__link {
  color: rgba(255,255,255,.60);
  font-size: var(--text-sm);
  transition: color var(--transition);
  text-decoration: none;
}

.footer__link:hover { color: var(--blue-light); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.10);
  padding-top: var(--space-md);
  text-align: center;
  font-size: var(--text-xs);
  color: rgba(255,255,255,.35);
}

/* 15. PAGE HERO (inner pages) */
.page-hero {
  background: linear-gradient(135deg, var(--navy) 0%, #0d2044 100%);
  padding-block: var(--space-3xl);
  text-align: center;
}

.page-hero__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--blue-light);
  background: rgba(66,135,245,.15);
  padding: .3em 1em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
}

.page-hero h1 { color: var(--white); margin-bottom: var(--space-sm); }
.page-hero p  { color: rgba(255,255,255,.72); font-size: var(--text-lg); max-width: 600px; margin-inline: auto; }

/* 16. CYBERSECURITY PAGE */
.cyber-grid {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: var(--space-lg);
}

.cyber-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}

.cyber-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }

.cyber-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.cyber-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.5rem;
}

.cyber-card__icon--blue   { background: rgba(66,135,245,.12); }
.cyber-card__icon--red    { background: rgba(220,38,38,.10);  }
.cyber-card__icon--green  { background: rgba(22,163,74,.10);  }
.cyber-card__icon--purple { background: rgba(147,51,234,.10); }
.cyber-card__icon--orange { background: rgba(234,88,12,.10);  }
.cyber-card__icon--teal   { background: rgba(13,148,136,.10); }

.cyber-card__title { font-size: var(--text-xl); color: var(--navy); }

.cyber-card__desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.cyber-card__tips { display: flex; flex-direction: column; gap: .6rem; }

.cyber-card__tip {
  display: flex;
  align-items: flex-start;
  gap: .6em;
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.55;
}

.cyber-card__tip::before {
  content: '✓';
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: .05em;
}

/* Callout */
.callout {
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.callout--info {
  background: rgba(66,135,245,.08);
  border: 1px solid rgba(66,135,245,.20);
  border-left: 4px solid var(--blue);
}

.callout--warning {
  background: rgba(234,88,12,.07);
  border: 1px solid rgba(234,88,12,.20);
  border-left: 4px solid #ea580c;
}

.callout__icon { font-size: 1.6rem; flex-shrink: 0; line-height: 1; }
.callout__body h4 { font-size: var(--text-lg); margin-bottom: .3em; }
.callout__body p  { font-size: var(--text-sm); color: var(--color-text-muted); }

/* 17. ARTICLE SECTIONS */
.article-section {
  max-width: 820px;
  margin-inline: auto;
}

.article-block {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.article-block:last-child { margin-bottom: 0; }

.article-block__icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
  line-height: 1;
}

.article-block h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
  color: var(--navy);
}

.article-block p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  line-height: 1.8;
}

.article-block p:last-child { margin-bottom: 0; }

.article-block ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-bottom: var(--space-sm);
}

.article-block ul li {
  display: flex;
  align-items: flex-start;
  gap: .6em;
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.6;
}

.article-block ul li::before {
  content: '▸';
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: .05em;
}

/* App cards */
.app-card {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.app-card__icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  flex-shrink: 0;
  background: var(--blue-bg);
}

.app-card__body { flex: 1; }

.app-card__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: .5em;
  flex-wrap: wrap;
}

.app-card__badge {
  font-size: var(--text-xs);
  font-weight: 700;
  padding: .15em .65em;
  border-radius: var(--radius-full);
  letter-spacing: .02em;
}

.badge--free     { background: rgba(22,163,74,.12); color: #16a34a; }
.badge--freepaid { background: rgba(234,88,12,.10);  color: #ea580c; }
.badge--paid     { background: rgba(147,51,234,.10); color: #9333ea; }

.app-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Category label */
.category-label {
  display: flex;
  align-items: center;
  gap: .5em;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

.category-label span { font-size: 1.5rem; }

/* Benefit cards (Why Learn Tech) */
.benefit-card {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.benefit-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.benefit-card__icon { font-size: 2.5rem; line-height: 1; }

.benefit-card__title {
  font-size: var(--text-xl);
  color: var(--navy);
}

.benefit-card__text {
  color: var(--color-text-muted);
  line-height: 1.7;
  flex: 1;
}

/* 18. RESPONSIVE */
@media (max-width: 1023px) {
  :root { --space-3xl: 4rem; --space-2xl: 3rem; }

  .grid-4       { grid-template-columns: repeat(2,1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__grid > *:first-child { grid-column: 1 / -1; }
  .split        { gap: var(--space-2xl); }
}

@media (max-width: 767px) {
  :root { --space-3xl: 3rem; --space-2xl: 2rem; }

  .nav__links { display: none; }
  .nav__toggle { display: flex; }

  .hero { min-height: auto; }
  .hero__content { padding-block: var(--space-2xl); }

  .split { grid-template-columns: 1fr; }
  .split__img { height: auto; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .cyber-grid { grid-template-columns: 1fr; }

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

  .newsletter__form { flex-direction: column; align-items: stretch; }
  .container { padding-inline: var(--space-md); }
}

/* 18. CONTACT FORM */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact-form {
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.contact-form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.contact-form__group label {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--dark);
}

.contact-form__group input,
.contact-form__group select,
.contact-form__group textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--dark);
  background: var(--white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color .2s;
  outline: none;
}

.contact-form__group input:focus,
.contact-form__group select:focus,
.contact-form__group textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(66,135,245,.15);
}

.contact-form__group textarea {
  resize: vertical;
  min-height: 140px;
}

.contact-form__submit {
  width: 100%;
  justify-content: center;
  font-size: var(--text-base);
  padding-block: 1rem;
}

.contact-info-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  background: var(--white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.contact-info-item__icon {
  font-size: 1.75rem;
  line-height: 1;
  flex-shrink: 0;
}

.contact-info-item__title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.25rem;
}

.contact-info-item__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin: 0;
}

.form-success {
  display: none;
  background: #f0fdf4;
  border: 2px solid #16a34a;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  color: #15803d;
  font-size: var(--text-lg);
  font-weight: 600;
}

@media (max-width: 767px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* 19. REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  html { scroll-behavior: auto; }
}