/* ============================================================
   碩思有限公司 — One-Page Website Stylesheet
   ============================================================ */

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

:root {
  --navy:       #0D1B2A;
  --navy-mid:   #1A2F45;
  --navy-light: #243B55;
  --gold:       #C9A84C;
  --gold-light: #E2C47A;
  --cream:      #F8F5EF;
  --white:      #FFFFFF;
  --gray-100:   #F4F4F6;
  --gray-300:   #CBCDD6;
  --gray-500:   #8A8FA8;
  --gray-700:   #3D4257;
  --text:       #1E2235;
  --font-serif: 'Noto Serif TC', 'Georgia', serif;
  --font-sans:  'Noto Sans TC', 'Helvetica Neue', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm:  0 2px 12px rgba(13, 27, 42, 0.08);
  --shadow-md:  0 8px 32px rgba(13, 27, 42, 0.14);
  --shadow-lg:  0 20px 60px rgba(13, 27, 42, 0.2);
}

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

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

/* ---------- Utility ---------- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2.2rem;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gold);
  color: var(--navy);
}
.btn-primary:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 168, 76, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.55);
}
.btn-outline:hover {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-2px);
}

.btn-full { width: 100%; }

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.section-divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  margin: 0 auto;
  border-radius: 2px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: all var(--transition);
  padding: 0;
}

#navbar.scrolled {
  background: rgba(13, 27, 42, 0.97);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--white);
}

.logo-zh {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.08em;
}

.logo-divider {
  color: rgba(255,255,255,0.3);
  font-size: 1rem;
}

.logo-en {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.65);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  position: relative;
  transition: color var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--gold);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--gold);
}

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

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: 1.5rem;
}

.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.5);
  padding: 0.25rem 0.4rem;
  border-radius: 3px;
  transition: all var(--transition);
}

.lang-btn:hover {
  color: var(--gold);
}

.lang-btn.active {
  color: var(--gold);
  background: rgba(201,168,76,0.12);
}

.lang-sep {
  color: rgba(255,255,255,0.2);
  font-size: 0.7rem;
  user-select: none;
}

/* Japanese font class */
[data-lang="ja"] body,
[data-lang="ja"] p,
[data-lang="ja"] h1,
[data-lang="ja"] h2,
[data-lang="ja"] h3,
[data-lang="ja"] h4,
[data-lang="ja"] li,
[data-lang="ja"] label,
[data-lang="ja"] button,
[data-lang="ja"] a {
  font-family: 'Noto Sans JP', 'Noto Sans TC', sans-serif;
}

[data-lang="ja"] .section-title,
[data-lang="ja"] .service-card h3,
[data-lang="ja"] .strength-item h4,
[data-lang="ja"] .hero-subtitle,
[data-lang="ja"] .title-zh {
  font-family: 'Noto Serif JP', 'Noto Serif TC', serif;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile nav */
@media (max-width: 768px) {
  .lang-switcher { margin-left: 0.5rem; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--navy);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0 2rem;
    transform: translateY(-120%);
    opacity: 0;
    transition: all var(--transition);
    border-top: 1px solid rgba(255,255,255,0.08);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }
  .nav-links a {
    padding: 1rem 2rem;
    display: block;
  }
}

/* ============================================================
   HERO
   ============================================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 55%, #1A2F45 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201,168,76,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,168,76,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

/* Decorative circle */
#hero::before {
  content: '';
  position: absolute;
  right: -15vw;
  top: 50%;
  transform: translateY(-50%);
  width: 55vw;
  height: 55vw;
  border-radius: 50%;
  border: 1.5px solid rgba(201,168,76,0.12);
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  right: -10vw;
  top: 50%;
  transform: translateY(-50%);
  width: 42vw;
  height: 42vw;
  border-radius: 50%;
  border: 1.5px solid rgba(201,168,76,0.08);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 2rem;
  max-width: 1160px;
  margin: 0 auto;
  width: 100%;
}

.hero-tagline-pre {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.5rem;
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 1.5rem;
}

.title-zh {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  line-height: 1.1;
}

.title-en {
  font-size: clamp(0.75rem, 1.5vw, 1.05rem);
  font-weight: 400;
  letter-spacing: 0.28em;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.4rem);
  color: var(--gold-light);
  letter-spacing: 0.12em;
  margin-bottom: 1.2rem;
}

.hero-desc {
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  color: rgba(255,255,255,0.65);
  line-height: 1.9;
  margin-bottom: 2.8rem;
  max-width: 560px;
}

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

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255,255,255,0.35);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.scroll-line {
  width: 1.5px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(201,168,76,0.5), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 0.5; }
  50% { transform: scaleY(0.7); opacity: 1; }
}

/* ============================================================
   ABOUT
   ============================================================ */
#about {
  padding: 7rem 0;
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-text p {
  color: var(--gray-700);
  line-height: 1.9;
  margin-bottom: 1.4rem;
  font-size: 1rem;
}

.about-text strong {
  color: var(--navy);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.stat-card {
  background: var(--gray-100);
  border: 1.5px solid rgba(13, 27, 42, 0.07);
  border-radius: 12px;
  padding: 1.8rem 1.4rem;
  text-align: center;
  transition: all var(--transition);
}

.stat-card:hover {
  border-color: var(--gold);
  background: var(--white);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.stat-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--navy);
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
}

/* ============================================================
   SERVICES
   ============================================================ */
#services {
  padding: 7rem 0;
  background: var(--cream);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.service-card {
  background: var(--white);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  position: relative;
  border: 1.5px solid rgba(13, 27, 42, 0.07);
  transition: all var(--transition);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(201,168,76,0.25);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card--featured {
  background: var(--navy);
  border-color: transparent;
}

.service-card--featured::before {
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0.6;
}

.service-card--featured h3,
.service-card--featured p,
.service-card--featured .service-list li {
  color: rgba(255,255,255,0.85);
}

.service-card--featured h3 {
  color: var(--white);
}

.service-card--featured .service-icon-wrap {
  color: var(--gold);
}

.service-card--featured .service-number {
  color: rgba(201,168,76,0.3);
}

.service-number {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--gray-300);
  margin-bottom: 1.2rem;
}

.service-icon-wrap {
  width: 52px;
  height: 52px;
  color: var(--navy);
  margin-bottom: 1.4rem;
}

.service-icon-wrap svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.9rem;
  letter-spacing: 0.04em;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.85;
  margin-bottom: 1.4rem;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.service-list li {
  font-size: 0.83rem;
  color: var(--gray-700);
  padding-left: 1.2rem;
  position: relative;
}

.service-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 0.75rem;
}

@media (max-width: 900px) {
  .services-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
}

/* ============================================================
   STRENGTHS
   ============================================================ */
#strengths {
  padding: 7rem 0;
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

#strengths::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201,168,76,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,168,76,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

#strengths .section-title {
  color: var(--white);
}

.strengths-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.strength-item {
  padding: 2rem 1.5rem;
  border: 1px solid rgba(201,168,76,0.15);
  border-radius: 12px;
  background: rgba(255,255,255,0.03);
  transition: all var(--transition);
}

.strength-item:hover {
  background: rgba(201,168,76,0.06);
  border-color: rgba(201,168,76,0.35);
  transform: translateY(-4px);
}

.strength-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin-bottom: 0.9rem;
  opacity: 0.7;
}

.strength-item h4 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.75rem;
  letter-spacing: 0.04em;
}

.strength-item p {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.85;
}

@media (max-width: 900px) {
  .strengths-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .strengths-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  padding: 7rem 0;
  background: var(--white);
}

.contact-intro {
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-top: 1.2rem;
  letter-spacing: 0.02em;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 5rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
}

.contact-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--gold);
  margin-top: 2px;
}

.contact-icon svg {
  width: 100%;
  height: 100%;
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 0.3rem;
}

.contact-value {
  font-size: 0.95rem;
  color: var(--navy);
  font-weight: 500;
}

.contact-languages {
  padding-top: 0.5rem;
}

.lang-tags {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.6rem;
}

.lang-tags span {
  background: var(--navy);
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  letter-spacing: 0.06em;
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray-700);
  letter-spacing: 0.04em;
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--text);
  background: var(--gray-100);
  border: 1.5px solid transparent;
  border-radius: 8px;
  padding: 0.8rem 1rem;
  outline: none;
  transition: all var(--transition);
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-300);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  background: var(--white);
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,168,76,0.12);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238A8FA8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.8rem center;
  background-size: 18px;
  padding-right: 2.5rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.form-note {
  font-size: 0.78rem;
  color: var(--gray-300);
  text-align: center;
  margin-top: -0.4rem;
}

@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .form-row { grid-template-columns: 1fr; }
}

/* ============================================================
   FOOTER
   ============================================================ */
#footer {
  background: var(--navy);
  color: rgba(255,255,255,0.55);
  padding: 3rem 0 1.5rem;
  border-top: 1px solid rgba(201,168,76,0.15);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.footer-brand .logo-zh {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.08em;
  margin-bottom: 0.2rem;
}

.logo-en-sm {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.3);
  margin-bottom: 0.8rem;
}

.footer-brand p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--gold);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 1.5rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.06em;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }

/* ============================================================
   RESPONSIVE MISC
   ============================================================ */
@media (max-width: 600px) {
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; text-align: center; }
  #about, #services, #strengths, #contact { padding: 5rem 0; }
  .section-header { margin-bottom: 2.5rem; }
}