/* ============================================================
   base.css — SCLab-inspired Base Styles
   ============================================================ */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--fw-regular);
  color: var(--text-body);
  background: var(--bg-page);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

main {
  min-height: calc(100vh - var(--nav-height));
  padding-top: var(--nav-height);
}

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 48px);
}

.section {
  padding: var(--section-gap) 0;
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--fw-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.section-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--fw-extrabold);
  color: var(--text-primary);
  margin-top: var(--space-12);
  margin-bottom: var(--space-8);
}

.page-title-wrap {
  padding-top: var(--space-10);
}

.page-title-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-title-inner .meta-badge {
  margin: 0;
}

.page-title-inner .page-title {
  margin: 0;
}

.page-subtitle {
  max-width: 760px;
  color: var(--text-muted);
  font-size: var(--text-base);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 0;
  border-radius: var(--radius-pill);
  padding: 8px 20px;
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  transition: filter var(--transition-fast) ease;
}

.btn:hover {
  filter: brightness(0.92);
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--color-border-soft);
}

.btn-warm {
  background: var(--color-accent-warm);
  color: var(--bg-dark-card);
  font-weight: var(--fw-bold);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: #FFFFFF;
  border-bottom: 1px solid transparent;
  transition: box-shadow 160ms ease, border-color 160ms ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-nav-scroll);
  border-color: var(--color-border);
}

.navbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding: 0 max(24px, calc((100vw - var(--content-max)) / 2));
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav-logo__icons {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-logo__icon {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  object-fit: cover;
  border: 1px solid var(--color-border-soft);
  background: #FFFFFF;
}

.nav-logo__meta {
  display: inline-flex;
  flex-direction: column;
}

.nav-logo__text {
  display: block;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: var(--fw-extrabold);
  color: var(--text-primary);
  letter-spacing: 0.01em;
  line-height: 1;
}

.nav-logo__sub {
  display: block;
  margin-top: 2px;
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin-left: auto;
}

.nav-links a,
.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 0;
  background: transparent;
  color: var(--text-body);
  font-size: var(--text-base);
  font-weight: var(--fw-medium);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-links a:hover,
.nav-trigger:hover,
.nav-links a.active,
.nav-item--dropdown.open .nav-trigger {
  color: var(--color-primary);
}

.nav-links a.active {
  font-weight: var(--fw-semibold);
}

.nav-item--dropdown {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  width: 240px;
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-dropdown);
  border: 1px solid var(--color-border);
  padding: var(--space-2);
  display: none;
}

.nav-item--dropdown:hover .nav-dropdown,
.nav-item--dropdown.open .nav-dropdown {
  display: block;
}

.nav-dropdown a {
  display: block;
  height: 44px;
  line-height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  color: var(--text-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
}

.nav-dropdown a:hover {
  background: #F5F5F5;
  color: var(--text-primary);
}

.nav-login {
  margin-left: var(--space-4);
}

.nav-mobile-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: 22px;
  padding: 4px;
  line-height: 1;
}

/* Hero */
.hero-wrap {
  padding-top: var(--space-10);
}

.hero-panel {
  position: relative;
  max-width: var(--content-max);
  min-height: 320px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  background: var(--bg-hero);
  padding: var(--space-12);
  overflow: hidden;
}

.hero-panel::before,
.hero-panel::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
}

.hero-panel::before {
  width: 180px;
  height: 180px;
  top: -40px;
  right: 140px;
  background: rgba(255, 255, 255, 0.42);
}

.hero-panel::after {
  width: 220px;
  height: 220px;
  bottom: -80px;
  left: -60px;
  background: rgba(255, 255, 255, 0.3);
}

.hero-title {
  position: relative;
  z-index: 1;
  max-width: 690px;
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: var(--fw-extrabold);
  color: var(--text-primary);
  line-height: 1.1;
}

.hero-tagline {
  position: relative;
  z-index: 1;
  max-width: 520px;
  margin: var(--space-16) 0 var(--space-6) auto;
  text-align: right;
  font-size: var(--text-base);
  color: var(--text-body);
}

.hero-cta {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* Shared filter row */
.filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  margin-top: var(--space-12);
  font-size: 13px;
  color: var(--text-muted);
}

.footer__minimal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

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

.mt-4 {
  margin-top: var(--space-4);
}

.mt-8 {
  margin-top: var(--space-8);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-panel {
    padding: var(--space-10);
  }
}

@media (max-width: 640px) {
  main {
    padding-top: calc(var(--nav-height) + var(--space-2));
  }

  .navbar__inner {
    padding: 0 16px;
    gap: var(--space-3);
  }

  .nav-logo {
    gap: 8px;
  }

  .nav-logo__icon {
    width: 24px;
    height: 24px;
  }

  .nav-logo__sub {
    display: none;
  }

  .nav-mobile-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-dropdown);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3) var(--space-4);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a,
  .nav-trigger {
    width: 100%;
    justify-content: space-between;
    padding: 10px 12px;
  }

  .nav-dropdown {
    position: static;
    width: 100%;
    border: 1px solid var(--color-border-soft);
    box-shadow: none;
    margin: 6px 0 0;
    display: none;
  }

  .nav-item--dropdown.open .nav-dropdown {
    display: block;
  }

  .nav-login {
    margin: 8px 0 0;
    width: 100%;
    justify-content: center;
  }

  .hero-wrap {
    padding-top: var(--space-6);
  }

  .hero-panel {
    min-height: auto;
    padding: var(--space-6);
  }

  .hero-tagline {
    margin: var(--space-8) 0 var(--space-4);
    text-align: left;
  }

  .hero-cta {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .page-title {
    margin-top: var(--space-8);
    margin-bottom: var(--space-6);
    font-size: 2rem;
  }

  .filter-row {
    align-items: stretch;
  }
}