/* =============================================
   Clínica Dental Sonrisa Premium — Estilos
   Mobile First | CSS Variables | AA Accessible
   ============================================= */

/* --- Variables --- */
:root {
  --color-primary: #0F4C81;
  --color-primary-dark: #0a3560;
  --color-secondary: #38BDF8;
  --color-accent: #14B8A6;
  --color-bg: #F8FAFC;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-white: #FFFFFF;
  --color-border: #E2E8F0;

  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  --shadow-sm: 0 1px 3px rgba(15, 76, 129, 0.08);
  --shadow-md: 0 4px 20px rgba(15, 76, 129, 0.1);
  --shadow-lg: 0 10px 40px rgba(15, 76, 129, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --header-height: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --container-max: 1200px;
  --section-padding: clamp(3.5rem, 8vw, 6rem);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-body);
  font-size: clamp(0.9375rem, 1.5vw, 1rem);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

ul {
  list-style: none;
}

address {
  font-style: normal;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

/* --- Container --- */
.container {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
}

/* --- Glassmorphism --- */
.glass {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  min-height: 48px;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  text-align: center;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

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

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 0.625rem 1.25rem;
  min-height: 40px;
  font-size: 0.875rem;
}

.btn--full {
  width: 100%;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: background var(--transition), box-shadow var(--transition);
}

.header--scrolled {
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 500;
}

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

.logo__icon {
  color: var(--color-accent);
}

.logo strong {
  color: var(--color-accent);
}

/* --- Navigation --- */
.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__list {
  display: none;
  gap: 1.75rem;
}

.nav__link {
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 0.25rem 0;
}

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

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

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

.nav__cta {
  display: none;
}

/* --- Hamburger --- */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1002;
}

.hamburger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger--active .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger--active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger--active .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-overlay {
  display: none;
}

/* --- Hero --- */
.hero {
  padding-top: calc(var(--header-height) + 2rem);
  padding-bottom: var(--section-padding);
  background: linear-gradient(160deg, var(--color-bg) 60%, rgba(56, 189, 248, 0.08));
  overflow: hidden;
}

.hero__grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.hero__badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  background: rgba(20, 184, 166, 0.1);
  border-radius: var(--radius-full);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(1.875rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero__visual {
  position: relative;
  max-width: 480px;
  margin-inline: auto;
}

.hero__image-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero__image {
  width: 100%;
  aspect-ratio: 8 / 9;
  object-fit: cover;
}

.stat-card {
  position: absolute;
  padding: 0.875rem 1.125rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  animation: float 4s ease-in-out infinite;
}

.stat-card--1 {
  top: 8%;
  left: -5%;
  animation-delay: 0s;
}

.stat-card--2 {
  bottom: 30%;
  right: -8%;
  animation-delay: 1s;
}

.stat-card--3 {
  bottom: 5%;
  left: 5%;
  animation-delay: 2s;
}

.stat-card__value {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-card__label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.3;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* --- Sections --- */
.section {
  padding-block: var(--section-padding);
}

.section__header {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 3rem;
}

.section__header--left {
  text-align: left;
  margin-inline: 0;
}

.section__tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-secondary);
  margin-bottom: 0.75rem;
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.625rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

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

/* --- Services --- */
.services {
  background: var(--color-white);
}

.services__grid {
  display: grid;
  gap: 1.5rem;
}

.service-card {
  padding: 2rem 1.5rem;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, rgba(15, 76, 129, 0.1), rgba(56, 189, 248, 0.15));
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.service-card__icon svg {
  width: 32px;
  height: 32px;
}

.service-card__title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.625rem;
}

.service-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* --- About --- */
.about__grid {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.about__image-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about__image {
  width: 100%;
  aspect-ratio: 6 / 7;
  object-fit: cover;
}

.about__text {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.0625rem;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.about__stat {
  text-align: center;
}

.about__stat-value {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-accent);
}

.about__stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.about__values-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.values-list {
  display: grid;
  gap: 1rem;
}

.values-list__item {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
}

.values-list__icon {
  flex-shrink: 0;
  color: var(--color-accent);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.values-list__item strong {
  display: block;
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-bottom: 0.125rem;
}

.values-list__item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Gallery --- */
.gallery {
  background: var(--color-white);
}

.gallery__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}

.gallery__trigger {
  display: block;
  width: 100%;
  padding: 0;
  border: none;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  background: none;
}

.gallery__trigger img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery__trigger:hover img {
  transform: scale(1.06);
}

/* --- Testimonials --- */
.testimonials__grid {
  display: grid;
  gap: 1.5rem;
}

.testimonial-card {
  padding: 2rem;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.testimonial-card__stars {
  color: #FBBF24;
  font-size: 1.125rem;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.testimonial-card__quote {
  margin-bottom: 1.25rem;
}

.testimonial-card__quote p {
  font-size: 1.0625rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.7;
}

.testimonial-card__author {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.9375rem;
}

/* --- Contact --- */
.contact {
  background: linear-gradient(180deg, var(--color-bg), rgba(15, 76, 129, 0.04));
}

.contact__grid {
  display: grid;
  gap: 3rem;
}

.contact__details {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact__item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 76, 129, 0.08);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.contact__icon svg {
  width: 22px;
  height: 22px;
}

.contact__item strong {
  display: block;
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.contact__item p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

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

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

/* --- Form --- */
.contact-form {
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-primary);
  margin-bottom: 0.375rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 48px;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
  outline: none;
}

.form-group input.error,
.form-group textarea.error {
  border-color: #EF4444;
}

.form-error {
  display: block;
  font-size: 0.8125rem;
  color: #EF4444;
  margin-top: 0.375rem;
  min-height: 1.25rem;
}

.form-success {
  margin-top: 1rem;
  padding: 0.875rem;
  background: rgba(20, 184, 166, 0.1);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
  font-weight: 500;
  text-align: center;
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  padding: 2.5rem 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.logo--footer {
  color: var(--color-white);
}

.logo--footer strong {
  color: var(--color-secondary);
}

.footer__tagline {
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.footer__nav a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
}

.footer__nav a:hover {
  color: var(--color-secondary);
}

.footer__copy {
  font-size: 0.8125rem;
  opacity: 0.7;
}

/* --- WhatsApp Float --- */
.whatsapp-float {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 900;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #25D366;
  color: var(--color-white);
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
  transition: transform var(--transition), box-shadow var(--transition);
}

.whatsapp-float svg {
  width: 28px;
  height: 28px;
}

.whatsapp-float:hover {
  color: var(--color-white);
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(37, 211, 102, 0.5);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  left: 1.5rem;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

.back-to-top:hover {
  transform: translateY(-3px);
}

.back-to-top[hidden] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(15, 76, 129, 0.92);
  backdrop-filter: blur(8px);
}

.lightbox[hidden] {
  display: none;
}

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition);
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.25);
}

.lightbox__image {
  max-width: 90vw;
  max-height: 75vh;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.lightbox__caption {
  margin-top: 1rem;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9375rem;
  text-align: center;
}

/* --- Tablet: 768px+ --- */
@media (min-width: 768px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .gallery__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .contact__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer__brand,
  .footer__copy {
    flex: 1;
  }

  .footer__copy {
    text-align: right;
  }
}

/* --- Desktop: 1024px+ --- */
@media (min-width: 1024px) {
  .hamburger {
    display: none;
  }

  .nav__list {
    display: flex;
  }

  .nav__cta {
    display: inline-flex;
  }

  .hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .hero__visual {
    margin-inline: 0;
    margin-left: auto;
  }

  .services__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about__grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .stat-card--1 {
    left: -12%;
  }

  .stat-card--2 {
    right: -12%;
  }
}

/* --- Large Desktop: 1440px+ --- */
@media (min-width: 1440px) {
  :root {
    --container-max: 1320px;
  }
}

/* --- Mobile Nav Open --- */
@media (max-width: 1023px) {
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 85vw);
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: calc(var(--header-height) + 2rem) 2rem 2rem;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: right var(--transition);
    z-index: 1001;
    gap: 0;
  }

  .nav--open {
    right: 0;
  }

  .nav__list {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 100%;
    margin-bottom: 2rem;
  }

  .nav__link {
    display: block;
    padding: 1rem 0;
    font-size: 1.0625rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__cta {
    display: inline-flex;
    width: 100%;
  }

  .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(15, 76, 129, 0.4);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
  }

  .nav-overlay--visible {
    opacity: 1;
    visibility: visible;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}