/* ===== DESIGN TOKENS ===== */
: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);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* 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;

  /* Fonts — Matching Avenir from Wix site */
  --font-display: 'Nunito Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Nunito Sans', 'Helvetica Neue', Arial, sans-serif;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

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

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ===== LIGHT MODE (Default) ===== */
:root, [data-theme="light"] {
  --color-bg:             #FAF9F6;
  --color-surface:        #FFFFFF;
  --color-surface-2:      #F5F3EF;
  --color-surface-offset: #EEEAE4;
  --color-border:         #D6D0C7;
  --color-divider:        #E2DDD6;

  --color-text:           #1A1A18;
  --color-text-muted:     #6B6860;
  --color-text-faint:     #A8A49C;
  --color-text-inverse:   #FAF9F6;

  --color-primary:        #1B4332;
  --color-primary-hover:  #143526;
  --color-primary-light:  #D4E4DB;

  --color-accent:         #8B6F47;
  --color-accent-hover:   #735B39;
  --color-accent-light:   #F0E8DB;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --color-bg:             #111110;
  --color-surface:        #1A1918;
  --color-surface-2:      #222120;
  --color-surface-offset: #1E1D1C;
  --color-border:         #3A3835;
  --color-divider:        #2A2928;

  --color-text:           #E2E0DC;
  --color-text-muted:     #9B9890;
  --color-text-faint:     #5C5A56;
  --color-text-inverse:   #111110;

  --color-primary:        #7CB896;
  --color-primary-hover:  #5FA37D;
  --color-primary-light:  #1E2F25;

  --color-accent:         #C9A872;
  --color-accent-hover:   #B08F56;
  --color-accent-light:   #2A2318;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111110;
    --color-surface:        #1A1918;
    --color-surface-2:      #222120;
    --color-surface-offset: #1E1D1C;
    --color-border:         #3A3835;
    --color-divider:        #2A2928;
    --color-text:           #E2E0DC;
    --color-text-muted:     #9B9890;
    --color-text-faint:     #5C5A56;
    --color-text-inverse:   #111110;
    --color-primary:        #7CB896;
    --color-primary-hover:  #5FA37D;
    --color-primary-light:  #1E2F25;
    --color-accent:         #C9A872;
    --color-accent-hover:   #B08F56;
    --color-accent-light:   #2A2318;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ===== LAYOUT ===== */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #FFFFFF;
  border-bottom: 1px solid #E8E8E8;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

[data-theme="dark"] .header {
  background: #1A1918;
  border-bottom-color: #333;
}

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

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

.header__logo svg {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.header__logo-img {
  width: 44px;
  height: auto;
  flex-shrink: 0;
  object-fit: contain;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.header__logo-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0;
  color: #181818;
}

[data-theme="dark"] .header__logo-name {
  color: var(--color-text);
}

.header__logo-sub {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 300;
  color: #181818;
  letter-spacing: 0;
}

[data-theme="dark"] .header__logo-sub {
  color: var(--color-text);
}

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

.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.header__nav a:hover {
  color: var(--color-text);
  background: oklch(from var(--color-text) l c h / 0.05);
}

.header__nav a.active {
  color: var(--color-primary);
  font-weight: 500;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: oklch(from var(--color-text) l c h / 0.06);
}

.mobile-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
}

.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  position: relative;
  transition: background 0.2s;
}

.mobile-toggle span::before,
.mobile-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.3s var(--ease-out);
}

.mobile-toggle span::before { top: -6px; }
.mobile-toggle span::after { top: 6px; }

.mobile-toggle.open span { background: transparent; }
.mobile-toggle.open span::before { transform: rotate(45deg) translate(4px, 4px); }
.mobile-toggle.open span::after { transform: rotate(-45deg) translate(4px, -4px); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: flex-end;
  padding-top: 4.5rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    oklch(from var(--color-bg) l c h / 0.95) 0%,
    oklch(from var(--color-bg) l c h / 0.6) 40%,
    oklch(from var(--color-bg) l c h / 0.2) 100%
  );
}

.hero__content {
  position: relative;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-16) var(--space-4) var(--space-12);
  width: 100%;
}

.hero__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text);
  max-width: 14ch;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 48ch;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}

.hero__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.hero__cta:active {
  transform: translateY(0);
}

.hero__cta svg {
  width: 16px;
  height: 16px;
}

/* ===== SECTIONS ===== */
.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

.section--alt {
  background: var(--color-surface-2);
}

.section__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

/* ===== ABOUT ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

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

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

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.stat {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
}

.stat__number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.about__continuation {
  margin-top: var(--space-8);
  max-width: 72ch;
}

.about__continuation p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

/* ===== PRACTICE AREAS ===== */
.practices__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.practice-card {
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}

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

.practice-card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.practice-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

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

/* ===== TEAM ===== */
.team__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.team-card {
  text-align: left;
}

.team-card__photo {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.team-card__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}

.team-card__photo svg {
  width: 48px;
  height: 48px;
  color: var(--color-text-faint);
}

.team-card__initials {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.6;
}

.team-card__name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.team-card__title {
  font-size: var(--text-xs);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
  font-weight: 500;
}

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

.team-card__email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

/* Team detail expandable */
.team-card__detail {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.team-card__bio {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  display: none;
}

.team-card__bio.show {
  display: block;
}

.team-card__toggle {
  font-size: var(--text-xs);
  color: var(--color-primary);
  cursor: pointer;
  padding: var(--space-1) 0;
  transition: color var(--transition-interactive);
}

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

.team-card__quals {
  font-size: var(--text-xs);
  color: var(--color-accent);
  line-height: 1.6;
  margin-bottom: var(--space-3);
  font-weight: 500;
}

/* ===== CHINESE SECTION ===== */
.chinese__content {
  max-width: 65ch;
}

.chinese__content p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

/* ===== CONTACT ===== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

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

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

.contact__item-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact__item-content h3 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

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

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

.contact__map {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.contact__map iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive), color var(--transition-interactive);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

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

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

/* ===== PRIVACY ===== */
/* ===== FOOTER ===== */
.footer {
  padding: var(--space-12) 0 var(--space-8);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 800;
  color: var(--color-text);
}

.footer__brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__col h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer__col a {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-1);
  transition: color var(--transition-interactive);
}

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

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__bottom a {
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

.reveal-up {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .reveal-up {
    clip-path: inset(100% 0 0 0);
    animation: reveal-clip linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-clip {
  to { clip-path: inset(0 0 0 0); }
}

/* ===== MOBILE NAV OVERLAY ===== */
.mobile-nav {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  top: 4.5rem;
  height: calc(100dvh - 4.5rem);
  z-index: 200;
  background: var(--color-bg);
  padding: var(--space-6) var(--space-4);
  flex-direction: column;
  gap: var(--space-1);
  border-top: 1px solid var(--color-border);
  overflow-y: auto;
}

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

.mobile-nav a {
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive);
}

.mobile-nav a:hover {
  background: oklch(from var(--color-text) l c h / 0.05);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .header__nav {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero__title {
    font-size: var(--text-2xl);
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .team__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 640px) {
  .hero {
    min-height: 75vh;
  }

  .hero__content {
    padding-top: var(--space-12);
    padding-bottom: var(--space-8);
  }

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

  .team__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

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

  .footer__inner {
    flex-direction: column;
    gap: var(--space-6);
  }

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

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

/* ===== SECTION NAV INDICATORS ===== */
.section[id] {
  scroll-margin-top: 5rem;
}

/* Active nav link */
.header__nav a[data-active="true"] {
  color: var(--color-primary);
  font-weight: 500;
}