/* ==========================================================================
   MicroClinic Project — Design System
   Based on design.json tokens
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens (CSS Variables)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Healthcare nonprofit palette */
  --color-bg: #ffffff;
  --color-surface: #f4f7f8;
  --color-surface-alt: #e8eef0;
  --color-text: #0f1720;
  --color-text-muted: #4a5560;
  --color-border: #c8d4da;
  --color-primary: #1a4765;
  --color-primary-hover: #143a52;
  --color-accent: #77bcbd;
  --color-accent-soft: #e5f2f2;
  --color-primary-soft: #e1e8ec;
  --color-focus: #1a73e8;

  /* Typography - Font stacks */
  --font-display: 'Libre Baskerville', Georgia, ui-serif, serif;
  --font-sans: Inter, system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* Type scale */
  --text-display-xl: 72px;
  --text-display-xl-line: 78px;
  --text-display-l: 56px;
  --text-display-l-line: 62px;
  --text-h1: 44px;
  --text-h1-line: 52px;
  --text-h2: 34px;
  --text-h2-line: 42px;
  --text-h3: 26px;
  --text-h3-line: 34px;
  --text-h4: 20px;
  --text-h4-line: 28px;
  --text-body-l: 18px;
  --text-body-l-line: 30px;
  --text-body: 16px;
  --text-body-line: 28px;
  --text-body-s: 14px;
  --text-body-s-line: 22px;
  --text-label: 12px;
  --text-label-line: 16px;

  /* Spacing scale (px) */
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;
  --space-96: 96px;
  --space-128: 128px;

  /* Section padding */
  --section-padding-y-mobile: 48px;
  --section-padding-x-mobile: 20px;
  --section-padding-y-tablet: 72px;
  --section-padding-x-tablet: 32px;
  --section-padding-y-desktop: 96px;
  --section-padding-x-desktop: 48px;

  /* Left/right margin for hero and header (logo aligns with text) */
  --content-margin-x: clamp(24px, 12vw, 180px);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* Elevation */
  --elevation-0: none;
  --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.06);
  --elevation-2: 0 6px 20px rgba(0, 0, 0, 0.10);

  /* Grid */
  --container-max: 1200px;
  --gutter-mobile: 20px;
  --gutter-tablet: 24px;
  --gutter-desktop: 32px;

  /* Motion */
  --duration-fast: 120ms;
  --duration-base: 180ms;
  --duration-slow: 280ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Max line length for readability (60-72 chars) */
p {
  max-width: 65ch;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--section-padding-x-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--section-padding-x-tablet);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--section-padding-x-desktop);
  }
}

/* Typography utilities */
.body-l {
  font-size: var(--text-body-l);
  line-height: calc(var(--text-body-l-line) / var(--text-body-l));
}

.body-s {
  font-size: var(--text-body-s);
  line-height: calc(var(--text-body-s-line) / var(--text-body-s));
}

/* --------------------------------------------------------------------------
   Section Base
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--section-padding-y-mobile);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--section-padding-y-tablet);
  }
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--section-padding-y-desktop);
  }
}

.section-header {
  margin-bottom: var(--space-48);
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: var(--space-64);
  }
}

.eyebrow {
  display: block;
  font-size: var(--text-label);
  line-height: var(--text-label-line);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: calc(var(--text-h2-line) / var(--text-h2));
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

.section-description {
  margin-top: var(--space-16);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Header (fixed overlay; transparent over hero, solid when scrolled)
   3-column grid: logo | nav (centered) | buttons
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 200;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 250ms ease, border-color 250ms ease, box-shadow 250ms ease;
}

.header--overlay {
  background-color: transparent;
  border-bottom-color: transparent;
}

.header--scrolled {
  background-color: var(--color-bg);
  border-bottom-color: var(--color-border);
  box-shadow: var(--elevation-1);
}

.header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-16);
  min-height: 100px;
  padding-left: var(--content-margin-x);  /* align logo with hero text */
  padding-right: clamp(20px, 8vw, 120px);  /* extend content further right */
}

@media (min-width: 768px) {
  .header__inner {
    min-height: 116px;
  }
}

/* Column 1: Logo - dual white/colored with crossfade */
.header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity 200ms ease;
}

.header__logo:hover,
.header__logo:focus-visible {
  opacity: 0.85;
}

.header__logo:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.brand {
  position: relative;
  display: flex;
  align-items: center;
  height: 100px;
}

@media (min-width: 768px) {
  .brand {
    height: 116px;
  }
}

.brand__img {
  height: 100%;
  width: auto;
  object-fit: contain;
  transition: opacity 250ms ease;
}

.brand__img--white {
  position: relative;
  display: block;
  transform: scale(1.12);
  transform-origin: left center;
}

.brand__img--color {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scale(1.12);
  transform-origin: left center;
}

.brand__img--white {
  opacity: 1;
}

.brand__img--color {
  opacity: 0;
}

.header--scrolled .brand__img--white {
  opacity: 0;
}

.header--scrolled .brand__img--color {
  opacity: 1;
}

/* Column 2: Nav - centered in middle column */
.header__nav {
  display: none;
}

@media (min-width: 768px) {
  .header__nav {
    display: flex;
    justify-content: flex-end;
  }
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.2vw, 32px);
  list-style: none;
  margin: 0 0 0 1.25rem;
  padding: 0;
}

.header__nav-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-size: var(--text-body);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  padding: var(--space-8) var(--space-12);
  border-radius: var(--radius-sm);
  transition: color 200ms ease, background-color 200ms ease;
}

.header__nav-list a:hover,
.header__nav-list a:focus-visible {
  background-color: rgba(119, 188, 189, 0.35);
}

.header__nav-list .nav-arrow {
  font-size: 0.5em;
  opacity: 0.9;
  line-height: 1;
}

.header--overlay .header__nav-list a {
  color: #ffffff;
}

.header--overlay .header__nav-list a:hover,
.header--overlay .header__nav-list a:focus-visible {
  color: #ffffff;
}

.header--scrolled .header__nav-list a:hover,
.header--scrolled .header__nav-list a:focus-visible {
  background-color: var(--color-accent-soft);
  color: var(--color-primary);
}

.header--scrolled .header__nav-list a {
  color: var(--color-text);
}

.header__nav-list a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Column 3: Button group + menu button (right-aligned) */
.header__right {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 13px;
}

.header__actions {
  display: none;
  align-items: center;
  gap: 13px;
}

.header__actions .btn--header-chw,
.header__actions .btn--header-clinician {
  min-width: 132px;
  justify-content: center;
}

@media (min-width: 768px) {
  .header__actions {
    display: flex;
  }

  .header__menu-btn {
    display: none;
  }
}

.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

/* Header buttons: both CHW and Clinician use same white oval (overlay) / primary (scrolled) */
.btn--header-chw {
  border: 2px solid transparent;
  transition: color 250ms ease, background-color 250ms ease;
}

.header--overlay .btn--header-chw {
  background-color: #ffffff;
  color: var(--color-primary);
}

.header--overlay .btn--header-chw:hover,
.header--overlay .btn--header-chw:focus {
  background-color: rgba(255, 255, 255, 0.9);
}

.header--scrolled .btn--header-chw {
  background-color: var(--color-primary);
  color: var(--color-bg);
}

.header--scrolled .btn--header-chw:hover,
.header--scrolled .btn--header-chw:focus {
  background-color: var(--color-primary-hover);
}

.btn--header-clinician {
  border: 2px solid transparent;
  transition: color 250ms ease, background-color 250ms ease;
}

.header--overlay .btn--header-clinician {
  background-color: #ffffff;
  color: var(--color-primary);
}

.header--overlay .btn--header-clinician:hover,
.header--overlay .btn--header-clinician:focus {
  background-color: rgba(255, 255, 255, 0.9);
}

.header--scrolled .btn--header-clinician {
  background-color: var(--color-primary);
  color: var(--color-bg);
}

.header--scrolled .btn--header-clinician:hover,
.header--scrolled .btn--header-clinician:focus {
  background-color: var(--color-primary-hover);
}

.header__menu-btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.header__menu-icon {
  position: relative;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: background-color 200ms ease;
}

.header--overlay .header__menu-btn {
  color: #ffffff;
}

.header--scrolled .header__menu-btn {
  color: var(--color-text);
}

.header__menu-icon::before,
.header__menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--duration-base) var(--ease-standard);
}

.header__menu-icon::before {
  top: -8px;
}

.header__menu-icon::after {
  top: 8px;
}

.header__menu-btn[aria-expanded="true"] .header__menu-icon {
  background-color: transparent;
}

.header__menu-btn[aria-expanded="true"] .header__menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.header__menu-btn[aria-expanded="true"] .header__menu-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.header__mobile-nav {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.header--overlay .header__mobile-nav {
  background-color: rgba(15, 23, 32, 0.98);
}

.header--overlay .header__mobile-nav a {
  color: #ffffff;
}

.header--overlay .header__mobile-nav .btn--header-chw,
.header--overlay .header__mobile-nav .btn--header-clinician {
  background-color: #ffffff;
  color: var(--color-primary);
}

.header__mobile-nav[hidden] {
  display: none;
}

.header__mobile-nav nav {
  padding: var(--space-24) var(--section-padding-x-mobile);
}

.header__mobile-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.header__mobile-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  margin-top: var(--space-24);
  padding-top: var(--space-24);
  border-top: 1px solid var(--color-border);
}

.header__mobile-nav a {
  font-size: var(--text-body-l);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
}

.header__mobile-nav a:hover,
.header__mobile-nav a:focus-visible {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Hero (hero-shell: full viewport, video behind header)
   -------------------------------------------------------------------------- */
.hero.hero-shell {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
  background-color: #0b1220;
}

.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(11, 18, 32, 0.55) 0%,
    rgba(11, 18, 32, 0.35) 40%,
    rgba(11, 18, 32, 0.55) 100%
  );
  z-index: 1;
}

.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin-inline: 0;
  margin-inline-end: auto;
  margin-inline-start: var(--content-margin-x);
  padding-top: calc(100px + var(--space-48));
  padding-bottom: var(--space-96);
}

@media (min-width: 768px) {
  .hero__inner {
    padding-top: calc(116px + var(--space-64));
    padding-bottom: var(--space-128);
  }
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(52px, 6vw, 96px);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin: 0.15in 0 var(--space-32) 0;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.hero__headline .headline-line {
  white-space: nowrap;
}

.hero__headline .accent {
  color: #77bcbd;
}

.hero__supporting {
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.95);
  margin: 0 0 var(--space-48);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Hero supporting text – emphasized with lines; white; extra space above */
.hero__supporting--emphasis {
  color: #ffffff;
  padding: var(--space-24) 0;
  margin: 10rem 0 var(--space-48);  /* ~1.5–2 in space above */
  border-top: 1px solid rgba(119, 188, 189, 0.5);
  border-bottom: 1px solid rgba(119, 188, 189, 0.5);
  max-width: 42em;
}

.hero__cta {
  display: inline-block;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding-inline: var(--space-24);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color var(--duration-base) var(--ease-standard),
    transform var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard);
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

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

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

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover,
.btn--outline:focus {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary-hover);
}

.btn--outline.btn--teal {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline.btn--teal:hover,
.btn--outline.btn--teal:focus {
  background-color: var(--color-accent-soft);
}

.btn--sm {
  min-height: 36px;
  padding-inline: var(--space-16);
  font-size: var(--text-body-s);
}

.btn--lg {
  min-height: 52px;
  padding-inline: var(--space-32);
  font-size: var(--text-body-l);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about__content {
  max-width: 65ch;
}

.about__text {
  margin: 0;
}

/* --------------------------------------------------------------------------
   Impact Section
   -------------------------------------------------------------------------- */
.section--impact {
  background-color: var(--color-surface);
}

.impact__inner {
  max-width: 800px;
}

.impact__headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, var(--text-h2));
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 var(--space-24);
}

.impact__text {
  margin: 0;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  gap: var(--space-32);
}

.card-grid--3 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .card-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid--3 {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gutter-desktop);
  }
}

.card {
  display: flex;
  flex-direction: column;
  padding: var(--space-32);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard);
}

@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }
}

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

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

.card--accent-soft {
  background-color: var(--color-accent-soft);
}

.card__label {
  display: block;
  font-size: var(--text-label);
  line-height: var(--text-label-line);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.card__title {
  font-size: var(--text-h3);
  line-height: calc(var(--text-h3-line) / var(--text-h3));
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 0 0 var(--space-12);
  color: var(--color-text);
}

.card__meta {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-12);
}

.card__excerpt {
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin: 0;
  flex-grow: 1;
}

/* --------------------------------------------------------------------------
   Contact Us Section
   -------------------------------------------------------------------------- */
.section--contact {
  background-color: var(--color-surface);
}

.contact {
  max-width: 700px;
}

.contact__content {
  margin-bottom: var(--space-32);
}

.contact__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: calc(var(--text-h2-line) / var(--text-h2));
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-16);
}

.contact__pitch {
  font-size: var(--text-body-l);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin: 0;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.contact__email,
.contact__link {
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

.contact__email:hover,
.contact__email:focus-visible,
.contact__link:hover,
.contact__link:focus-visible {
  color: var(--color-primary-hover);
}

.contact__email:focus-visible,
.contact__link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-64) var(--space-48);
}

@media (min-width: 768px) {
  .footer {
    padding-block: var(--space-80) var(--space-64);
  }
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-48);
  margin-bottom: var(--space-48);
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
}

.footer__tagline {
  margin: 0;
  max-width: 45ch;
}

.footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16) var(--space-32);
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__nav-list a {
  font-size: var(--text-body);
  color: var(--color-text);
  text-decoration: none;
}

.footer__nav-list a:hover,
.footer__nav-list a:focus-visible {
  color: var(--color-primary);
}

.footer__nav-list a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  padding-top: var(--space-32);
  border-top: 1px solid var(--color-border);
}

@media (min-width: 640px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer__social {
  display: flex;
  gap: var(--space-24);
}

.footer__social-link {
  font-size: var(--text-body-s);
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer__social-link:hover,
.footer__social-link:focus-visible {
  color: var(--color-primary);
}

.footer__copyright {
  color: var(--color-text-muted);
  margin: 0;
}