/* ===== TOP CONTROLS (theme + lang) ===== */
.top-controls {
  position: fixed;
  top: 20px;
  right: 24px;
  z-index: 150;
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 5px 8px;
  gap: 2px;
}

.top-controls__lang {
  display: flex;
  align-items: center;
  gap: 4px;
}

.top-controls__lang-btn {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-tertiary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color var(--duration-fast), background var(--duration-fast);
  line-height: 1;
}

.top-controls__lang-btn.active {
  color: var(--color-text-primary);
  background: var(--color-surface-raised);
}

.top-controls__lang-btn:hover:not(.active) {
  color: var(--color-text-secondary);
}

.top-controls__lang-sep {
  font-size: 0.75rem;
  color: var(--color-border-strong);
  line-height: 1;
}

.top-controls__theme {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  border-radius: 50%;
  transition: color var(--duration-fast), background var(--duration-fast);
  padding: 0;
}

.top-controls__theme:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-raised);
}

@media (max-width: 900px) {
  .top-controls {
    top: 10px;
    right: 60px;
  }
}

/* ===== MOBILE HEADER ===== */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 56px;
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding-inline: 20px;
  align-items: center;
  justify-content: space-between;
}

@media (max-width: 900px) {
  .mobile-header {
    display: flex;
  }

  body {
    padding-top: 56px;
  }
}

/* ===== NAVIGATION (legacy, used in case pages) ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-standard);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
}

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

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-text-primary);
  transition: color var(--duration-fast) var(--ease-standard);
  line-height: 1;
}

.nav__logo:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-standard);
  position: relative;
  padding-bottom: 2px;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration-base) var(--ease-standard);
}

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__link.active {
  color: var(--color-text-primary);
}

/* Theme toggle */
.nav__theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
  cursor: pointer;
}

.nav__theme-toggle:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-raised);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  cursor: pointer;
  color: var(--color-text-primary);
}

.nav__hamburger span {
  display: block;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--duration-slow) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-standard);
  transform-origin: center;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu overlay */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease-standard);
}

.nav__mobile.open {
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-h2-size);
  color: var(--color-text-primary);
  transition: color var(--duration-fast);
}

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

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__mobile {
    display: flex;
  }
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(0) !important;
}

.btn--primary {
  background: var(--color-accent);
  color: #FFFFFF;
  padding: 14px 28px;
  border: 1.5px solid transparent;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text-primary);
  padding: 13px 27px;
  border: 1.5px solid var(--color-border-strong);
  font-weight: 500;
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--ghost {
  background: none;
  color: var(--color-text-secondary);
  padding: 0;
  font-weight: 500;
  border: none;
  gap: 6px;
}

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

.btn--ghost:hover .btn__arrow {
  transform: translateX(4px);
}

.btn__arrow {
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-standard);
  font-size: 1.1em;
  line-height: 1;
}

/* ===== CASE STUDY CARD ===== */
.case-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto;
  transition: border-color var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard);
}

.case-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.case-card__cover {
  grid-column: 1 / -1;
}

.case-card__cover {
  width: 100%;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  background: var(--color-surface-raised);
}

.case-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 400ms var(--ease-standard);
}

.case-card:hover .case-card__cover img {
  transform: scale(1.02);
}

.case-card__inner {
  padding: var(--space-8);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-6) var(--space-10);
  align-items: start;
}

.case-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.case-card__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-8) 0 0 var(--space-8);
}

.case-card__eyebrow {
  font-size: var(--text-label-size);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.case-card__title {
  color: var(--color-text-primary);
}

.case-card__context {
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.case-card__metric {
  text-align: right;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  padding: var(--space-8) var(--space-8) 0 0;
}

.case-card__metric-number {
  font-family: var(--font-display);
  font-style: normal;
  font-size: 2.75rem;
  line-height: 1;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.case-card__metric-label {
  font-size: var(--text-caption-size);
  color: var(--color-text-tertiary);
  text-align: right;
  max-width: 140px;
  line-height: 1.4;
}

.case-card__footer {
  grid-column: 1 / -1;
  margin: 0 var(--space-8);
  padding: var(--space-5) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.case-card__outcomes {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.outcome {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.outcome__value {
  font-size: var(--text-h4-size);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.2;
}

.outcome__label {
  font-size: var(--text-caption-size);
  color: var(--color-text-tertiary);
}

@media (max-width: 768px) {
  .case-card {
    grid-template-columns: 1fr;
    padding: var(--space-5);
    gap: var(--space-5);
  }

  .case-card__metric {
    text-align: left;
    align-items: flex-start;
    padding-top: 0;
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-3);
  }

  .case-card__metric-label {
    text-align: left;
    max-width: none;
  }

  .case-card__metric-number {
    font-size: 2.25rem;
  }

  .case-card__footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===== TAGS ===== */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-label-size);
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  line-height: 1;
}

.tag--accent {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.tag--default {
  background: var(--color-surface-raised);
  color: var(--color-text-secondary);
}

/* ===== ABOUT HOW ITEMS ===== */
.how-item {
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-border);
  transition: border-color var(--duration-base);
}

.how-item:hover {
  border-left-color: var(--color-accent);
}

/* ===== CONTACT LINK ===== */
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}

.contact-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ===== HERO ENTRANCE ANIMATIONS ===== */
.hero__animate {
  opacity: 0;
  transform: translateY(12px);
  animation: heroEnter var(--duration-enter) var(--ease-decelerate) forwards;
}

.hero__animate:nth-child(1) { animation-delay: 100ms; }
.hero__animate:nth-child(2) { animation-delay: 250ms; }
.hero__animate:nth-child(3) { animation-delay: 400ms; }

@keyframes heroEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== STAT COUNTER ===== */
.stat-counter {
  display: inline;
}

/* ===== SECTION STATS ROW ===== */
.stats-row {
  display: flex;
  gap: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat__value {
  font-family: var(--font-display);
  font-style: normal;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.stat__label {
  font-size: var(--text-caption-size);
  color: var(--color-text-tertiary);
}