/* ============================================
   SmartAdapt — Material Design 3 Inspired
   Modern healthcare tech landing page
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Primary palette — healthcare blue */
  --md-primary: #1a73e8;
  --md-primary-light: #4285f4;
  --md-primary-dark: #1557b0;
  --md-on-primary: #ffffff;

  /* Surface & background */
  --md-surface: #ffffff;
  --md-surface-dim: #f8f9fa;
  --md-surface-container: #f1f3f4;
  --md-surface-container-high: #e8eaed;
  --md-surface-variant: #e3e8f0;

  /* Text */
  --md-on-surface: #1f1f1f;
  --md-on-surface-variant: #5f6368;
  --md-outline: #dadce0;

  /* Accent colors */
  --md-blue: #1a73e8;
  --md-green: #0d652d;
  --md-green-bg: #e6f4ea;
  --md-purple: #7b1fa2;
  --md-purple-bg: #f3e8fd;
  --md-orange: #e8710a;
  --md-orange-bg: #fef7e0;
  --md-teal: #007b83;
  --md-teal-bg: #e0f7fa;
  --md-red: #d93025;
  --md-red-bg: #fce8e6;
  --md-blue-bg: #e8f0fe;

  /* Dark section */
  --md-dark: #1a1c2e;
  --md-dark-surface: #252842;

  /* Elevation */
  --md-elevation-1: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.1);
  --md-elevation-2: 0 1px 3px rgba(0,0,0,.08), 0 4px 8px rgba(0,0,0,.1);
  --md-elevation-3: 0 2px 6px rgba(0,0,0,.08), 0 8px 24px rgba(0,0,0,.12);

  /* Shape */
  --md-radius-sm: 8px;
  --md-radius-md: 12px;
  --md-radius-lg: 16px;
  --md-radius-xl: 28px;
  --md-radius-full: 100px;

  /* Motion */
  --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-duration: 300ms;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: 'Google Sans Text', 'Segoe UI', Roboto, sans-serif;
  color: var(--md-on-surface);
  background: var(--md-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Google Sans', 'Segoe UI', Roboto, sans-serif;
  line-height: 1.2;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--md-outline);
  transition: box-shadow var(--md-motion-duration) var(--md-motion-standard);
}

.nav--scrolled {
  box-shadow: var(--md-elevation-2);
}

.nav__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Google Sans', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--md-primary);
}

.nav__logo .material-symbols-outlined { font-size: 28px; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__links a {
  padding: 8px 16px;
  border-radius: var(--md-radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  transition: all var(--md-motion-duration) var(--md-motion-standard);
}

.nav__links a:hover {
  background: var(--md-surface-container);
  color: var(--md-on-surface);
}

.nav__cta {
  background: var(--md-primary) !important;
  color: var(--md-on-primary) !important;
}

.nav__cta:hover {
  background: var(--md-primary-dark) !important;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--md-radius-full);
  color: var(--md-on-surface);
}

.nav__toggle:hover { background: var(--md-surface-container); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 160px 24px 100px;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 30%, #f8f9fa 100%);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(26,115,232,.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(66,133,244,.06) 0%, transparent 50%),
    radial-gradient(circle at 60% 80%, rgba(123,31,162,.04) 0%, transparent 50%);
}

.hero__container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero__chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-radius: var(--md-radius-full);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 700;
  color: var(--md-on-surface);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--md-on-surface-variant);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.stat { text-align: center; }

.stat__number {
  display: block;
  font-family: 'Google Sans', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--md-primary);
}

.stat__label {
  font-size: 14px;
  color: var(--md-on-surface-variant);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--md-radius-full);
  font-family: 'Google Sans', sans-serif;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--md-motion-duration) var(--md-motion-standard);
  border: none;
}

.btn--filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-1);
}

.btn--filled:hover {
  background: var(--md-primary-dark);
  box-shadow: var(--md-elevation-2);
}

.btn--outlined {
  background: transparent;
  color: var(--md-primary);
  border: 1.5px solid var(--md-primary);
}

.btn--outlined:hover {
  background: var(--md-blue-bg);
}

/* ---------- Sections ---------- */
.section {
  padding: 96px 24px;
}

.section--alt {
  background: var(--md-surface-dim);
}

.section--dark {
  background: var(--md-dark);
}

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section__chip {
  display: inline-flex;
  padding: 4px 14px;
  background: var(--md-blue-bg);
  color: var(--md-primary);
  border-radius: var(--md-radius-full);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
}

.section__chip--light {
  background: rgba(255,255,255,.15);
  color: rgba(255,255,255,.9);
}

.section__title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section__title--light { color: #ffffff; }

.section__subtitle {
  font-size: 17px;
  color: var(--md-on-surface-variant);
  line-height: 1.7;
}

.section__subtitle--light { color: rgba(255,255,255,.7); }

/* ---------- Cards Grid ---------- */
.cards {
  display: grid;
  gap: 24px;
}

.cards--grid {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.cards--three {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  padding: 32px;
  border-radius: var(--md-radius-lg);
  transition: all var(--md-motion-duration) var(--md-motion-standard);
}

.card--elevated {
  background: var(--md-surface);
  border: 1px solid var(--md-outline);
}

.card--elevated:hover {
  box-shadow: var(--md-elevation-3);
  transform: translateY(-2px);
}

.card--filled {
  background: var(--md-surface);
  border: 1px solid var(--md-outline);
}

.card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--md-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card__icon .material-symbols-outlined { font-size: 26px; }

.card__icon--blue { background: var(--md-blue-bg); color: var(--md-blue); }
.card__icon--green { background: var(--md-green-bg); color: var(--md-green); }
.card__icon--purple { background: var(--md-purple-bg); color: var(--md-purple); }
.card__icon--orange { background: var(--md-orange-bg); color: var(--md-orange); }
.card__icon--teal { background: var(--md-teal-bg); color: var(--md-teal); }
.card__icon--red { background: var(--md-red-bg); color: var(--md-red); }

.card__icon-inline {
  font-size: 32px;
  color: var(--md-primary);
  margin-bottom: 16px;
  display: block;
}

.card__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card__text {
  font-size: 15px;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--md-primary);
}

.card__link .material-symbols-outlined { font-size: 18px; }

.card__link:hover { text-decoration: underline; }

/* ---------- Feature Sections ---------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.feature--reverse { direction: rtl; }
.feature--reverse > * { direction: ltr; }

.feature__title {
  font-size: clamp(28px, 3.5vw, 36px);
  font-weight: 700;
  margin-bottom: 16px;
}

.feature__text {
  font-size: 16px;
  color: var(--md-on-surface-variant);
  line-height: 1.7;
  margin-bottom: 28px;
}

.feature__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--md-on-surface);
}

.feature__list .material-symbols-outlined {
  font-size: 22px;
  color: var(--md-primary);
  flex-shrink: 0;
  margin-top: 1px;
}

/* Feature Visual Cards */
.feature__card {
  background: var(--md-surface);
  border-radius: var(--md-radius-lg);
  border: 1px solid var(--md-outline);
  overflow: hidden;
  box-shadow: var(--md-elevation-2);
}

.feature__card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background: var(--md-surface-container);
  font-weight: 500;
  font-size: 14px;
  border-bottom: 1px solid var(--md-outline);
}

.feature__card-header .material-symbols-outlined {
  color: var(--md-primary);
  font-size: 20px;
}

.feature__card-body {
  padding: 24px 20px;
}

/* Voice Demo */
.voice-demo { text-align: center; }

.voice-demo__wave {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--md-blue-bg);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pulse 2s infinite;
}

.voice-demo__wave::after {
  content: 'mic';
  font-family: 'Material Symbols Outlined';
  font-size: 28px;
  color: var(--md-primary);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26,115,232,.3); }
  50% { box-shadow: 0 0 0 16px rgba(26,115,232,0); }
}

.voice-demo__text {
  font-size: 18px;
  font-weight: 500;
  color: var(--md-on-surface);
  margin-bottom: 20px;
  font-style: italic;
}

.voice-demo__response {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--md-green-bg);
  color: var(--md-green);
  border-radius: var(--md-radius-full);
  font-size: 14px;
  font-weight: 500;
}

.voice-demo__response .material-symbols-outlined { font-size: 18px; }

/* Phone Mockup */
.feature__phone {
  background: var(--md-on-surface);
  border-radius: 32px;
  padding: 0;
  overflow: hidden;
  max-width: 320px;
  margin: 0 auto;
  box-shadow: var(--md-elevation-3);
}

.phone__header {
  background: var(--md-primary);
  color: white;
  padding: 16px 20px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phone__time { font-size: 13px; font-weight: 500; }
.phone__title { font-size: 17px; font-weight: 600; }

.phone__body {
  background: var(--md-surface);
  padding: 20px;
}

.phone__greeting {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--md-on-surface);
}

.phone__devices {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.phone__device {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--md-radius-md);
  background: var(--md-surface-container);
  font-size: 14px;
  font-weight: 500;
}

.phone__device .material-symbols-outlined {
  font-size: 22px;
  color: var(--md-on-surface-variant);
}

.phone__device--on {
  background: var(--md-blue-bg);
}

.phone__device--on .material-symbols-outlined {
  color: var(--md-primary);
}

.phone__device-status {
  margin-left: auto;
  font-size: 13px;
  color: var(--md-on-surface-variant);
}

/* Chat Demo */
.chat {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat__msg {
  padding: 12px 16px;
  border-radius: var(--md-radius-lg);
  font-size: 14px;
  line-height: 1.5;
  max-width: 90%;
}

.chat__msg--user {
  background: var(--md-primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chat__msg--ai {
  background: var(--md-surface-container);
  color: var(--md-on-surface);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat__typing {
  display: inline-flex;
  gap: 4px;
  margin-bottom: 8px;
}

.chat__typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--md-on-surface-variant);
  animation: typing 1.4s infinite both;
}

.chat__typing span:nth-child(2) { animation-delay: 0.2s; }
.chat__typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
  30% { opacity: 1; transform: scale(1); }
}

/* Waveform */
.waveform { text-align: center; }

.waveform__bars {
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 6px;
  height: 100px;
  margin-bottom: 20px;
}

.waveform__bar {
  width: 12px;
  height: var(--h);
  background: var(--md-surface-container-high);
  border-radius: 6px;
  animation: wave 1.5s ease-in-out infinite alternate;
}

.waveform__bar--active {
  background: var(--md-primary);
}

@keyframes wave {
  0% { transform: scaleY(1); }
  100% { transform: scaleY(0.6); }
}

.waveform__bar:nth-child(2) { animation-delay: 0.1s; }
.waveform__bar:nth-child(3) { animation-delay: 0.2s; }
.waveform__bar:nth-child(4) { animation-delay: 0.3s; }
.waveform__bar:nth-child(5) { animation-delay: 0.15s; }
.waveform__bar:nth-child(6) { animation-delay: 0.25s; }
.waveform__bar:nth-child(7) { animation-delay: 0.35s; }
.waveform__bar:nth-child(8) { animation-delay: 0.2s; }
.waveform__bar:nth-child(9) { animation-delay: 0.1s; }
.waveform__bar:nth-child(10) { animation-delay: 0.3s; }
.waveform__bar:nth-child(11) { animation-delay: 0.15s; }
.waveform__bar:nth-child(12) { animation-delay: 0.05s; }

.waveform__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--md-green-bg);
  color: var(--md-green);
  border-radius: var(--md-radius-full);
  font-size: 14px;
  font-weight: 500;
}

.waveform__label .material-symbols-outlined { font-size: 18px; }

/* ---------- Tech Grid ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.tech-item {
  text-align: center;
  padding: 32px;
}

.tech-item .material-symbols-outlined {
  font-size: 36px;
  color: var(--md-primary);
  margin-bottom: 16px;
}

.tech-item h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tech-item p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.contact-card {
  text-align: center;
  padding: 32px;
  background: var(--md-dark-surface);
  border-radius: var(--md-radius-lg);
  border: 1px solid rgba(255,255,255,.08);
}

.contact-card .material-symbols-outlined {
  font-size: 32px;
  color: var(--md-primary-light);
  margin-bottom: 12px;
}

.contact-card h4 {
  color: rgba(255,255,255,.9);
  font-size: 16px;
  margin-bottom: 8px;
}

.contact-card p,
.contact-card a {
  color: rgba(255,255,255,.6);
  font-size: 14px;
}

.contact-card a:hover {
  color: var(--md-primary-light);
}

/* ---------- Footer ---------- */
.footer {
  padding: 24px;
  background: var(--md-surface-dim);
  border-top: 1px solid var(--md-outline);
}

.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  font-size: 16px;
  color: var(--md-primary);
}

.footer__brand .material-symbols-outlined { font-size: 22px; }

.footer__divider {
  color: var(--md-on-surface-variant);
  font-weight: 400;
  font-size: 14px;
}

.footer__copy {
  font-size: 13px;
  color: var(--md-on-surface-variant);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--md-surface);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--md-outline);
    box-shadow: var(--md-elevation-2);
  }

  .nav__links.active { display: flex; }

  .nav__toggle { display: block; }

  .hero { padding: 120px 24px 64px; }

  .hero__stats { gap: 24px; }

  .feature {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .feature--reverse { direction: ltr; }

  .section { padding: 64px 24px; }

  .footer__content {
    flex-direction: column;
    text-align: center;
  }

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

@media (max-width: 480px) {
  .hero__title { font-size: 32px; }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .btn { width: 100%; justify-content: center; }
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--md-motion-standard), transform 0.6s var(--md-motion-standard);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}