/* ========================================
   You and Me — Shared Stylesheet
   Warm, professional pet life education
   ======================================== */

:root {
  /* Brand colors */
  --color-cream: #fbf7f2;
  --color-cream-dark: #f3ebe2;
  --color-white: #ffffff;
  --color-ink: #1f343b;
  --color-ink-soft: #5c6b71;
  --color-primary: #2a7f8a;
  --color-primary-dark: #1f646d;
  --color-primary-light: #e6f4f6;
  --color-accent: #e48161;
  --color-accent-dark: #c86645;
  --color-warm: #c4a484;
  --color-success: #2a7f8a;
  --color-error: #c0152f;
  --color-border: rgba(94, 82, 64, 0.18);
  --color-shadow: rgba(31, 52, 59, 0.1);
  --color-overlay: rgba(19, 40, 46, 0.55);

  /* Typography */
  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system, sans-serif;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 1.875rem;
  --fs-3xl: 2.25rem;
  --fs-4xl: clamp(2.25rem, 4vw, 3rem);
  --lh-tight: 1.25;
  --lh-normal: 1.7;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* 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;

  /* Layout */
  --container: 1120px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;
  --shadow-sm: 0 4px 14px var(--color-shadow);
  --shadow-md: 0 12px 30px rgba(31, 52, 59, 0.12);
  --shadow-lg: 0 20px 50px rgba(31, 52, 59, 0.16);
  --transition: 0.25s ease;
  --focus-ring: 0 0 0 3px rgba(42, 127, 138, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-ink);
  background: var(--color-cream);
  -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-primary-dark);
}

ul,
ol {
  padding-left: 1.2rem;
}

h1,
h2,
h3,
h4 {
  line-height: var(--lh-tight);
  margin: 0 0 var(--space-4);
  font-weight: var(--fw-bold);
  color: var(--color-ink);
}

p {
  margin: 0 0 var(--space-4);
}

button,
input,
textarea {
  font: inherit;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-3) var(--space-4);
  z-index: 1000;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

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

.section {
  padding: var(--space-16) 0;
}

.section--alt {
  background: var(--color-cream-dark);
}

.section__eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  color: var(--color-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section__title {
  font-size: var(--fs-3xl);
  margin-bottom: var(--space-4);
}

.section__lead {
  max-width: 42rem;
  color: var(--color-ink-soft);
  font-size: var(--fs-md);
  margin-bottom: var(--space-8);
}

.section__header {
  margin-bottom: var(--space-10);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0.75rem 1.4rem;
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  font-weight: var(--fw-semibold);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

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

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

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.85);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--color-white);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--accent:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
}

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

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 247, 242, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

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

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
}

.brand:hover {
  color: var(--color-ink);
}

.brand__mark {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--color-primary), #3aa8b4);
  color: var(--color-white);
  display: grid;
  place-items: center;
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  flex-shrink: 0;
}

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

.brand__name {
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
}

.brand__sub {
  font-size: 0.7rem;
  color: var(--color-ink-soft);
}

.nav {
  display: none;
}

.nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-ink-soft);
  border-radius: var(--radius-full);
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
}

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

.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle__bar {
  width: 18px;
  height: 2px;
  background: var(--color-ink);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--color-border);
  background: var(--color-cream);
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: var(--space-3) 0 var(--space-5);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--color-ink);
  font-weight: var(--fw-medium);
  border-radius: var(--radius-sm);
}

.mobile-nav__link:hover,
.mobile-nav__link.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Hero */
.hero {
  position: relative;
  min-height: clamp(420px, 72vh, 680px);
  display: grid;
  align-items: end;
  color: var(--color-white);
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
}

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

.hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(19, 40, 46, 0.25) 0%, rgba(19, 40, 46, 0.72) 100%),
    radial-gradient(circle at 20% 20%, rgba(42, 127, 138, 0.35), transparent 45%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: var(--space-16) 0 var(--space-12);
}

.hero__title {
  color: var(--color-white);
  font-size: var(--fs-4xl);
  max-width: 14ch;
  margin-bottom: var(--space-4);
}

.hero__tagline {
  max-width: 36rem;
  font-size: var(--fs-md);
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: var(--space-6);
}

.hero__hotline {
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-6);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  font-size: var(--fs-sm);
}

.hero__hotline a {
  color: var(--color-white);
  font-weight: var(--fw-semibold);
}

.page-hero {
  padding: var(--space-16) 0 var(--space-12);
  background:
    linear-gradient(135deg, rgba(42, 127, 138, 0.12), rgba(228, 129, 97, 0.08)),
    var(--color-cream-dark);
  border-bottom: 1px solid var(--color-border);
}

.page-hero__title {
  font-size: var(--fs-4xl);
}

.page-hero__lead {
  max-width: 40rem;
  color: var(--color-ink-soft);
  font-size: var(--fs-md);
}

/* Cards & grids */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-6);
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card__media img {
  transform: scale(1.04);
}

.card__body {
  padding: var(--space-6);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--fs-xl);
  margin-bottom: var(--space-4);
}

.card__title {
  font-size: var(--fs-lg);
  margin-bottom: var(--space-3);
}

.card__text,
.card__list {
  color: var(--color-ink-soft);
}

.card__list {
  margin: 0;
  padding-left: 1.1rem;
}

.card__list li + li {
  margin-top: var(--space-2);
}

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

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

.split__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 280px;
}

.feature-banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 280px;
  display: grid;
  align-items: end;
  color: var(--color-white);
}

.feature-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-banner__overlay {
  position: relative;
  z-index: 1;
  padding: var(--space-8);
  background: linear-gradient(180deg, transparent, rgba(19, 40, 46, 0.75));
}

.feature-banner__text {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  margin: 0;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.check-list li {
  position: relative;
  padding-left: 1.8rem;
  color: var(--color-ink-soft);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45rem;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: inset 0 0 0 3px var(--color-primary-light);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
}

.cta-band {
  background: linear-gradient(135deg, var(--color-primary), #1f646d 55%, #c86645);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  display: grid;
  gap: var(--space-6);
}

.cta-band h2,
.cta-band p {
  color: var(--color-white);
}

.cta-band p {
  opacity: 0.92;
  margin: 0;
}

.steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.steps li::before {
  content: counter(step);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: grid;
  place-items: center;
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
}

/* Contact */
.contact-grid {
  display: grid;
  gap: var(--space-8);
}

.contact-card,
.form-card,
.map-placeholder {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.contact-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.contact-meta strong {
  display: block;
  margin-bottom: var(--space-1);
}

.contact-meta a {
  font-weight: var(--fw-semibold);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
}

.form-control {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.95rem;
  background: var(--color-cream);
  color: var(--color-ink);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
  outline: none;
  background: var(--color-white);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.form-status {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
}

.form-status--success {
  background: rgba(42, 127, 138, 0.12);
  color: var(--color-primary-dark);
  border: 1px solid rgba(42, 127, 138, 0.25);
}

.form-status--error {
  background: rgba(192, 21, 47, 0.08);
  color: var(--color-error);
  border: 1px solid rgba(192, 21, 47, 0.2);
}

.hidden {
  display: none !important;
}

.map-placeholder {
  min-height: 280px;
  display: grid;
  place-items: center;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(42, 127, 138, 0.08), rgba(228, 129, 97, 0.08)),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 12px,
      rgba(94, 82, 64, 0.04) 12px,
      rgba(94, 82, 64, 0.04) 24px
    );
}

.map-placeholder__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--fs-xl);
}

.map-placeholder p {
  margin: 0;
  color: var(--color-ink-soft);
}

.map-placeholder strong {
  display: block;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

/* Footer */
.site-footer {
  background: #17333a;
  color: rgba(255, 255, 255, 0.86);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-8);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.9);
}

.site-footer a:hover {
  color: #9ad7de;
}

.footer__grid {
  display: grid;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer__title {
  color: var(--color-white);
  font-size: var(--fs-lg);
  margin-bottom: var(--space-3);
}

.footer__text {
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 var(--space-3);
}

.footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: var(--space-6);
  display: grid;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.65);
}

.rainbow-line {
  height: 6px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #ff5459, #e48161, #32b8c6, #7ec8a3);
  margin-bottom: var(--space-6);
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition);
  z-index: 90;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
}

/* Scroll animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn:hover,
  .card:hover {
    transform: none;
  }
}

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

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .split {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .contact-grid {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .cta-band {
    grid-template-columns: 1.4fr auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .nav {
    display: block;
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav,
  .mobile-nav.is-open {
    display: none;
  }

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

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

  .brand__name {
    font-size: var(--fs-base);
  }
}

@media (max-width: 959px) {
  body.nav-open {
    overflow: hidden;
  }
}