/* ========================================
   JST 頭皮護理官網 — 共用樣式表
   ======================================== */

/* ── CSS 變數 ── */
:root {
  --color-cream: #FAF8F5;
  --color-ivory: #F5F0E8;
  --color-sage: #A8B5A0;
  --color-sage-dark: #8A9A82;
  --color-sage-light: #D4DDD0;
  --color-wood: #C4A882;
  --color-wood-light: #E8DCC8;
  --color-gold: #D4AF37;
  --color-gold-light: #F0E6C8;
  --color-text-primary: #3D3D3D;
  --color-text-secondary: #6B6B6B;
  --color-text-light: #9A9A9A;
  --color-white: #FFFFFF;

  --font-size-hero: 3rem;
  --font-size-h1: 2.25rem;
  --font-size-h2: 1.75rem;
  --font-size-h3: 1.375rem;
  --font-size-h4: 1.125rem;
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --font-size-xs: 0.75rem;

  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;
  --letter-spacing-wide: 0.05em;
  --letter-spacing-wider: 0.1em;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  --container-max: 1200px;
  --container-padding: 1.5rem;

  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.8s;
}

/* ── 重置 ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--duration-fast) var(--ease-out);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ── 佈局 ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

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

.section--loose {
  padding: var(--space-2xl) 0;
}

/* ── 排版 ── */
.section-title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-align: center;
  margin-bottom: var(--space-md);
  letter-spacing: var(--letter-spacing-wide);
}

.section-subtitle {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-xl);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.page-header {
  background: linear-gradient(135deg, var(--color-ivory) 0%, var(--color-cream) 100%);
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
  border-bottom: 1px solid var(--color-sage-light);
}

.page-header__title {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: var(--letter-spacing-wide);
}

.page-header__subtitle {
  font-size: var(--font-size-h4);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* ── 按鈕 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-sage);
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(168, 181, 160, 0.3);
}

.btn-primary:hover {
  background: var(--color-sage-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(168, 181, 160, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--color-sage);
  border: 1.5px solid var(--color-sage);
}

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

.btn-line {
  background: #06C755;
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(6, 199, 85, 0.3);
}

.btn-line:hover {
  background: #05a347;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(6, 199, 85, 0.4);
}

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

.btn-gold:hover {
  background: #b8962e;
  transform: translateY(-2px);
}

.btn-small {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-small);
}

/* ── 卡片 ── */
.card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.card--image-top .card__image {
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: var(--space-md);
  aspect-ratio: 4 / 3;
}

.card--image-top .card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.card--image-top:hover .card__image img {
  transform: scale(1.05);
}

.card__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.card__text {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.card__meta {
  font-size: var(--font-size-small);
  color: var(--color-sage-dark);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-xs);
}

/* ── 價格卡片 ── */
.pricing-card {
  background: var(--color-white);
  border: 1px solid var(--color-sage-light);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  text-align: center;
  position: relative;
  transition: all var(--duration-normal) var(--ease-out);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.pricing-card--featured {
  border: 2px solid var(--color-gold);
  background: linear-gradient(180deg, var(--color-ivory) 0%, var(--color-cream) 100%);
}

.pricing-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-gold);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: var(--letter-spacing-wide);
}

.pricing-card__name {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.pricing-card__price {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  color: var(--color-sage-dark);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.pricing-card__price span {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
}

.pricing-card__features {
  margin: var(--space-md) 0;
  text-align: left;
}

.pricing-card__features li {
  padding: 0.5rem 0;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-sage-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-card__features li:last-child {
  border-bottom: none;
}

.pricing-card__features li i {
  color: var(--color-sage);
  font-size: 0.875rem;
}

/* ── 導覽列 ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  z-index: 1000;
  transition: all var(--duration-normal) var(--ease-out);
}

.navbar__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__logo {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: var(--letter-spacing-wide);
}

.navbar__logo span {
  color: var(--color-sage);
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.navbar__menu a {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  position: relative;
}

.navbar__menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-sage);
  transition: width var(--duration-normal) var(--ease-out);
}

.navbar__menu a:hover {
  color: var(--color-sage);
}

.navbar__menu a:hover::after,
.navbar__menu a.active::after {
  width: 100%;
}

.navbar__menu a.active {
  color: var(--color-sage);
}

.navbar__cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 5px;
}

.navbar__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--duration-normal) var(--ease-out);
}

/* ── 頁尾 ── */
.footer {
  background: var(--color-ivory);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid var(--color-sage-light);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: var(--space-xl);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.footer__brand .footer__logo {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-sm);
  letter-spacing: var(--letter-spacing-wide);
}

.footer__brand p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

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

.footer__social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-sage-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-sage-dark);
  transition: all var(--duration-fast) var(--ease-out);
}

.footer__social a:hover {
  background: var(--color-sage);
  color: var(--color-white);
}

.footer__links h4,
.footer__contact h4 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer__links ul li {
  margin-bottom: 0.75rem;
}

.footer__links ul li a {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__links ul li a:hover {
  color: var(--color-sage);
}

.footer__contact p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.footer__contact p i {
  color: var(--color-sage);
  margin-top: 3px;
  font-size: 0.875rem;
  width: 16px;
}

.footer__bottom {
  max-width: var(--container-max);
  margin: var(--space-lg) auto 0;
  padding: var(--space-md) var(--container-padding) 0;
  border-top: 1px solid var(--color-sage-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.footer__bottom a {
  color: var(--color-text-light);
  transition: color var(--duration-fast) var(--ease-out);
}

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

/* ── CTA 區塊 ── */
.cta-section {
  background: linear-gradient(135deg, var(--color-sage-light) 0%, var(--color-ivory) 100%);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.cta-section__title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.cta-section__subtitle {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  line-height: var(--line-height-relaxed);
}

.cta-section__buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ── FAQ 手風琴 ── */
.faq-item {
  background: var(--color-white);
  border-radius: 12px;
  margin-bottom: var(--space-sm);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: box-shadow var(--duration-normal) var(--ease-out);
}

.faq-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.faq-item__question {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
}

.faq-item__question i {
  color: var(--color-sage);
  transition: transform var(--duration-normal) var(--ease-out);
  font-size: 0.875rem;
}

.faq-item.active .faq-item__question i {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-normal) var(--ease-out), padding var(--duration-normal) var(--ease-out);
}

.faq-item.active .faq-item__answer {
  max-height: 500px;
}

.faq-item__answer-inner {
  padding: 0 var(--space-lg) var(--space-md);
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.faq-category {
  margin-bottom: var(--space-xl);
}

.faq-category__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-sage-dark);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-sage-light);
  display: inline-block;
}

/* ── 表單 ── */
.form-group {
  margin-bottom: var(--space-md);
}

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

.form-group label .required {
  color: #E74C3C;
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-sage-light);
  border-radius: 10px;
  background: var(--color-white);
  color: var(--color-text-primary);
  font-size: var(--font-size-body);
  transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-sage);
  box-shadow: 0 0 0 3px rgba(168, 181, 160, 0.15);
}

.form-control::placeholder {
  color: var(--color-text-light);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B6B6B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

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

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: var(--space-md);
}

.form-check input {
  margin-top: 3px;
  accent-color: var(--color-sage);
}

.form-check label {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* ── 網格系統 ── */
.grid {
  display: grid;
  gap: var(--space-md);
}

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

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

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

/* ── 動畫 ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out), transform var(--duration-slow) var(--ease-out);
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.delay-4 { transition-delay: 0.4s; }
.animate-on-scroll.delay-5 { transition-delay: 0.5s; }

/* ── 響應式 ── */
@media (max-width: 1024px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-hero: 2.25rem;
    --font-size-h1: 1.75rem;
    --font-size-h2: 1.5rem;
    --font-size-h3: 1.25rem;
  }

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

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

  .navbar__menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: var(--space-md);
    gap: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .navbar__menu.open {
    display: flex;
  }

  .navbar__menu a {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-sage-light);
    width: 100%;
  }

  .navbar__menu a::after {
    display: none;
  }

  .navbar__cta .btn {
    display: none;
  }

  .navbar__toggle {
    display: flex;
  }

  .navbar__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .navbar__toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .navbar__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    text-align: center;
  }

  .footer__social {
    justify-content: center;
  }

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

  .page-header {
    padding: var(--space-2xl) 0 var(--space-lg);
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
  }
}

@media (max-width: 640px) {
  :root {
    --container-padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  .pricing-card {
    padding: 2rem 1.5rem;
  }
}

/* ── 工具類 ── */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.hidden { display: none; }

@media (min-width: 769px) {
  .hidden-desktop { display: none; }
}

@media (max-width: 768px) {
  .hidden-mobile { display: none; }
}