/* ========================================
   堇也·nail (Jin Ye Nail)
   Brand Style Sheet
   Created: 2026-06-26
   ======================================== */

/* ---------- CSS Variables ---------- */
:root {
  /* Color Palette */
  --color-charcoal: #2A2A2A;
  --color-ink: #1A1A1A;
  --color-cream: #F5F1EB;
  --color-paper: #FAF7F2;
  --color-violet: #9B7EBD;       /* 堇紫 */
  --color-violet-light: #C9B5DD;
  --color-gold: #A88B5C;          /* 暗金 */
  --color-red: #C85A4A;           /* 朱红 */
  --color-line: #D4CFC8;          /* 分割线 */
  --color-muted: #6B6661;         /* 弱化文字 */

  /* Typography */
  --font-serif-zh: "Noto Serif TC", "Source Han Serif TC", "PingFang TC", serif;
  --font-sans-zh: "Noto Sans TC", "PingFang TC", sans-serif;
  --font-display: "Cormorant Garamond", "Times New Roman", serif;
  --font-body: var(--font-serif-zh);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-xxl: 12rem;

  /* Layout */
  --max-width: 1280px;
  --content-width: 720px;
  --header-height: 80px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 200ms;
  --duration-base: 400ms;
  --duration-slow: 800ms;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  opacity: 0.7;
}

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

ul, ol {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-family: var(--font-display);
  font-weight: 600;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-sm);
}

.eyebrow {
  font-family: var(--font-sans-zh);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}

.lead {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--color-charcoal);
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

.divider {
  height: 1px;
  background: var(--color-line);
  margin: var(--space-lg) 0;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid var(--color-line);
}

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

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.logo .zh {
  font-family: var(--font-serif-zh);
  font-weight: 500;
}

.logo .en {
  font-size: 0.8em;
  color: var(--color-muted);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.main-nav a {
  font-size: 0.95rem;
  color: var(--color-charcoal);
  position: relative;
  padding: 0.5rem 0;
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-violet);
  transition: width var(--duration-base) var(--ease-out);
}

.main-nav a:hover::after {
  width: 100%;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: calc(var(--header-height) + var(--space-lg)) var(--space-md) var(--space-lg);
  background: var(--color-paper);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 20%;
  left: 15%;
  width: 12rem;
  height: 12rem;
  background: var(--color-cream);
  border-radius: 2px;
  filter: blur(40px);
  opacity: 0.6;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero h1 {
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--color-charcoal);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.1em;
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.9rem 2.5rem;
  font-size: 0.95rem;
  font-family: var(--font-sans-zh);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: 1px solid var(--color-ink);
  background: var(--color-ink);
  color: var(--color-paper);
  transition: all var(--duration-base) var(--ease-out);
  cursor: pointer;
}

.btn:hover {
  background: transparent;
  color: var(--color-ink);
  opacity: 1;
}

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

.btn-outline:hover {
  background: var(--color-ink);
  color: var(--color-paper);
}

.btn-violet {
  background: var(--color-violet);
  border-color: var(--color-violet);
}

.btn-violet:hover {
  background: transparent;
  color: var(--color-violet);
}

/* ---------- Grid: Collections ---------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.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); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
}

/* ---------- Card: Nail Item ---------- */
.nail-card {
  position: relative;
  overflow: hidden;
  background: var(--color-cream);
  aspect-ratio: 4/5;
  transition: transform var(--duration-slow) var(--ease-out);
}

.nail-card:hover {
  transform: translateY(-4px);
}

.nail-card .image-wrap {
  position: absolute;
  inset: 0;
  background: var(--color-cream);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.nail-card .image-wrap::before {
  content: "";
  position: absolute;
  top: 20%;
  left: 20%;
  right: 20%;
  bottom: 20%;
  border: 1px dashed var(--color-line);
}

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

.nail-card:hover img {
  transform: scale(1.05);
}

.nail-card .info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md);
  background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
  color: white;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--duration-base) var(--ease-out);
}

.nail-card:hover .info {
  opacity: 1;
  transform: translateY(0);
}

.nail-card .info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.nail-card .info .price {
  font-size: 0.95rem;
  opacity: 0.9;
}

/* ---------- Style Category Cards ---------- */
.style-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

@media (max-width: 1024px) {
  .style-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .style-grid { grid-template-columns: 1fr; }
}

.style-card {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
  cursor: pointer;
  background: var(--color-cream);
}

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

.style-card:hover img {
  transform: scale(1.05);
}

.style-card .label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(42, 42, 42, 0.35);
  color: white;
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: background var(--duration-base) var(--ease-out);
}

.style-card:hover .label {
  background: rgba(42, 42, 42, 0.5);
}

/* ---------- Section: Featured ---------- */
.featured {
  background: var(--color-cream);
}

/* ---------- Section: About Preview ---------- */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

@media (max-width: 768px) {
  .about-preview { grid-template-columns: 1fr; }
}

.about-preview .image {
  aspect-ratio: 4/5;
  background: var(--color-cream);
  position: relative;
  overflow: hidden;
}

.about-preview .image::after {
  content: "";
  position: absolute;
  top: 30%;
  left: 30%;
  right: 30%;
  bottom: 30%;
  border: 1px dashed var(--color-line);
}

/* ---------- Section: Process ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  text-align: center;
}

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

.process-step .number {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--color-violet);
  margin-bottom: var(--space-sm);
}

.process-step h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

.process-step p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ---------- Section: Testimonials ---------- */
.testimonials {
  background: var(--color-ink);
  color: var(--color-paper);
}

.testimonials .section-header h2 {
  color: var(--color-paper);
}

.testimonials .section-header .eyebrow {
  color: var(--color-violet-light);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 768px) {
  .testimonial-grid { grid-template-columns: 1fr; }
}

.testimonial {
  padding: var(--space-md);
  border: 1px solid rgba(255,255,255,0.1);
}

.testimonial .quote {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.6;
  margin-bottom: var(--space-md);
  font-style: italic;
}

.testimonial .author {
  font-size: 0.9rem;
  color: var(--color-violet-light);
  letter-spacing: 0.1em;
}

/* ---------- Section: CTA ---------- */
.cta-section {
  background: var(--color-cream);
  text-align: center;
  padding: var(--space-xl) var(--space-md);
}

.cta-section h2 {
  margin-bottom: var(--space-md);
}

.cta-section p {
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  color: var(--color-charcoal);
}

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

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }
}

.footer-brand .logo {
  color: var(--color-paper);
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  color: var(--color-violet-light);
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
}

.footer-col a:hover {
  color: var(--color-paper);
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-md);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.social-links a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all var(--duration-base) var(--ease-out);
}

.social-links a:hover {
  background: var(--color-violet);
  border-color: var(--color-violet);
  opacity: 1;
}

/* ---------- Page Hero (Sub-pages) ---------- */
.page-hero {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  text-align: center;
  background: var(--color-cream);
}

.page-hero h1 {
  margin-bottom: var(--space-sm);
}

.page-hero p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-charcoal);
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-md) 0;
}

.faq-item summary {
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-right: var(--space-sm);
}

.faq-item summary::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--color-violet);
  transition: transform var(--duration-base) var(--ease-out);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin-top: var(--space-sm);
  color: var(--color-charcoal);
  padding-left: 0;
}

/* ---------- Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Mobile Nav ---------- */
.menu-toggle {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--color-ink);
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .main-nav.open {
    display: flex;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-paper);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-sm);
    border-bottom: 1px solid var(--color-line);
  }
}

/* ---------- Print ---------- */
@media print {
  .site-header,
  .site-footer,
  .cta-section {
    display: none;
  }
}