/* ========================================
   SINCLAIR TECHNOLOGIES — Design Tokens
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Fonts */
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-display: 'Instrument Serif', Georgia, serif;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* LIGHT MODE (Default) */
:root, [data-theme="light"] {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-surface-2: #f1f3f5;
  --color-surface-offset: #e9ecef;
  --color-divider: #dee2e6;
  --color-border: #ced4da;

  --color-text: #1a2332;
  --color-text-muted: #5a6577;
  --color-text-faint: #adb5bd;
  --color-text-inverse: #f8f9fa;

  /* Sinclair Teal */
  --color-primary: #1a5c6b;
  --color-primary-hover: #134a56;
  --color-primary-active: #0d3840;
  --color-primary-light: #e8f4f6;
  --color-primary-highlight: #c5dde2;

  /* Sinclair Gold */
  --color-accent: #b8933a;
  --color-accent-hover: #9a7a2e;
  --color-accent-light: #faf3e0;

  /* Status */
  --color-error: #a12c7b;
  --color-success: #437a22;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

/* DARK MODE */
[data-theme="dark"] {
  --color-bg: #0f1419;
  --color-surface: #1a2028;
  --color-surface-2: #212830;
  --color-surface-offset: #171d24;
  --color-divider: #2a3240;
  --color-border: #354050;

  --color-text: #d5dbe3;
  --color-text-muted: #8892a0;
  --color-text-faint: #4a5568;
  --color-text-inverse: #1a2332;

  --color-primary: #4faabb;
  --color-primary-hover: #3a95a6;
  --color-primary-active: #2a8090;
  --color-primary-light: #1a2e34;
  --color-primary-highlight: #253a40;

  --color-accent: #d4ad50;
  --color-accent-hover: #c49d3e;
  --color-accent-light: #2a2418;

  --color-error: #d163a7;
  --color-success: #6daa45;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0f1419;
    --color-surface: #1a2028;
    --color-surface-2: #212830;
    --color-surface-offset: #171d24;
    --color-divider: #2a3240;
    --color-border: #354050;
    --color-text: #d5dbe3;
    --color-text-muted: #8892a0;
    --color-text-faint: #4a5568;
    --color-text-inverse: #1a2332;
    --color-primary: #4faabb;
    --color-primary-hover: #3a95a6;
    --color-primary-active: #2a8090;
    --color-primary-light: #1a2e34;
    --color-primary-highlight: #253a40;
    --color-accent: #d4ad50;
    --color-accent-hover: #c49d3e;
    --color-accent-light: #2a2418;
    --color-error: #d163a7;
    --color-success: #6daa45;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* ========================================
   GLOBAL LAYOUT
   ======================================== */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-default);
}

section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

/* ========================================
   HEADER / NAVIGATION
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease;
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
}

.header__top a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.header__top a:hover {
  color: var(--color-primary);
}

.header__top-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__top-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding: var(--space-3) 0;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.header__logo img {
  height: 44px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav__cta {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-inverse);
  background: var(--color-primary);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  text-decoration: none;
  white-space: nowrap;
}

.nav__cta:hover {
  background: var(--color-primary-hover);
}

/* Mobile nav */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
}

.theme-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100dvh;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-surface);
    padding: var(--space-16) var(--space-6) var(--space-6);
    box-shadow: var(--shadow-lg);
    transition: right 0.3s ease;
    z-index: 200;
    gap: var(--space-1);
  }
  .nav--open { right: 0; }
  .nav__link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }
  .nav__cta {
    text-align: center;
    margin-top: var(--space-4);
  }
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 150;
  }
  .nav-overlay--visible { display: block; }
  .header__top { display: none; }
}

/* ========================================
   HERO
   ======================================== */

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-primary-active);
  padding-block: 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left center;
  opacity: 0.25;
  filter: blur(2px);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13, 56, 64, 0.92) 0%, rgba(13, 56, 64, 0.96) 40%, rgba(26, 92, 107, 0.94) 100%);
  z-index: 1;
}

.hero__grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-10);
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

.hero__content {
  position: relative;
  max-width: 600px;
}

.hero__image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__image img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-xl);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
  border: 3px solid rgba(255, 255, 255, 0.15);
  object-fit: cover;
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero__image {
    order: -1;
  }
  .hero__image img {
    max-width: 400px;
    margin-inline: auto;
  }
  .hero__actions {
    justify-content: center;
  }
  .hero__subtitle {
    margin-inline: auto;
  }
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: #ffffff;
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

.hero__title em {
  font-style: italic;
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--space-8);
  max-width: 560px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #1a1a1a;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
}

.btn--outline {
  background: transparent;
  color: #ffffff;
  border: 1.5px solid rgba(255,255,255,0.4);
}

.btn--outline:hover {
  border-color: #ffffff;
  background: rgba(255,255,255,0.08);
}

.btn--solid {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--solid:hover {
  background: var(--color-primary-hover);
}

/* ========================================
   SECTION HEADERS
   ======================================== */

.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

.section-header__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section-header__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-inline: auto;
}

/* ========================================
   MISSION
   ======================================== */

.mission {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.mission__content {
  max-width: 860px;
  margin-inline: auto;
  text-align: center;
}

.mission__icon {
  width: 48px;
  height: 48px;
  margin-inline: auto;
  margin-bottom: var(--space-6);
  color: var(--color-primary);
}

.mission__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  max-width: 100%;
}

/* ========================================
   CARDS GRID
   ======================================== */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card__image {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--color-surface-2);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card__image img {
  transform: scale(1.04);
}

.card__body {
  padding: var(--space-5) var(--space-5) var(--space-6);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.card__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.card__link:hover {
  color: var(--color-primary-hover);
}

.card__link svg {
  transition: transform 0.2s ease;
}

.card__link:hover svg {
  transform: translateX(3px);
}

/* ========================================
   TEAM
   ======================================== */

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
}

.team-member {
  text-align: center;
}

.team-member__photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin-inline: auto;
  margin-bottom: var(--space-5);
  border: 3px solid var(--color-divider);
}

.team-member__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.team-member__role {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.team-member__bio {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 480px;
  margin-inline: auto;
}

.team-member__bio-toggle {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
  margin-top: var(--space-2);
  padding: 0;
}

.team-member__bio-toggle:hover {
  color: var(--color-primary-hover);
}

.team-member__bio-full {
  display: none;
}

.team-member__bio-full.is-visible {
  display: inline;
}

/* ========================================
   RESEARCH
   ======================================== */

.research-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 720px;
  margin-inline: auto;
}

.research-item {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.research-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.research-item__icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--color-primary);
}

.research-item__content {
  flex: 1;
}

.research-item__title {
  font-weight: 600;
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.research-item__sub {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.research-item__arrow {
  color: var(--color-text-faint);
  flex-shrink: 0;
  transition: transform 0.2s ease, color 0.2s ease;
}

.research-item:hover .research-item__arrow {
  transform: translateX(3px);
  color: var(--color-primary);
}

/* ========================================
   DRUGS
   ======================================== */

.drugs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  max-width: 700px;
  margin-inline: auto;
}

/* ========================================
   CONTACT
   ======================================== */

.contact-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: start;
}

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-info__block {
  display: flex;
  gap: var(--space-4);
}

.contact-info__icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.contact-info__text h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.contact-info__text p,
.contact-info__text a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 1.6;
}

.contact-info__text a:hover {
  color: var(--color-primary);
}

.contact-info__map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-divider);
}

.contact-info__map img {
  width: 100%;
  height: auto;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer__brand img {
  height: 36px;
  width: auto;
}

.footer__brand p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 320px;
  line-height: 1.6;
}

.footer__col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: 0.02em;
}

.footer__col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer__col a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer__bottom a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer__bottom a:hover {
  color: var(--color-primary);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  transition: all 0.2s ease;
}

.footer__social a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ========================================
   PAGE HEADERS (interior pages)
   ======================================== */

.page-header {
  position: relative;
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
  background: var(--color-primary-active);
  overflow: hidden;
}

.page-header__bg {
  position: absolute;
  inset: 0;
}

.page-header__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-header__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,56,64,0.9), rgba(26,92,107,0.7));
}

.page-header__content {
  position: relative;
  z-index: 2;
}

.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: #ffffff;
}

.page-header__breadcrumb {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  margin-top: var(--space-2);
}

.page-header__breadcrumb a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
}

.page-header__breadcrumb a:hover {
  color: #ffffff;
}

/* ========================================
   CONTENT SECTIONS (interior pages)
   ======================================== */

.content-section {
  max-width: 860px;
  margin-inline: auto;
}

.content-section p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.sub-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.sub-nav-card {
  display: block;
  text-decoration: none;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.sub-nav-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.sub-nav-card img {
  width: 100%;
  aspect-ratio: 5/4;
  object-fit: cover;
}

.sub-nav-card__label {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
}

/* ========================================
   UTILITY
   ======================================== */

.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 50;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
}