/* ==========================================================================
   VELTRON STUDIO LIMITED · 水墨東方極簡 · 純黑白
   主色：#111111 墨 / #ffffff 紙 / #fafafa 背景留白 / #9ca3af 灰
   ========================================================================== */

:root {
  --ink:        #111111;
  --paper:      #ffffff;
  --bg:         #fafafa;
  --gray:       #9ca3af;
  --line:       rgba(17, 17, 17, 0.10);
  --line-soft:  rgba(17, 17, 17, 0.06);
  --muted:      #6b7280;
  --shadow:     0 1px 30px rgba(17, 17, 17, 0.04);

  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang HK",
                "PingFang SC", "Hiragino Sans GB", "Microsoft JhengHei", sans-serif;
  --font-serif: Georgia, "Songti TC", "Songti SC", "STSong", serif;

  --maxw:       1140px;
  --ease:       cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

::selection { background: var(--ink); color: var(--paper); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
}

.section { padding: 128px 0; }
.section-sm { padding: 88px 0; }

.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 28px;
  font-weight: 400;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--muted);
  max-width: 560px;
  line-height: 1.9;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease),
              padding 0.4s var(--ease);
  padding: 22px 0;
}
.navbar.is-scrolled {
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
  padding: 14px 0;
}

.nav-container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.22em;
}
.nav-logo .logo-mark { flex-shrink: 0; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 40px;
}
.nav-link {
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  position: relative;
  padding: 4px 0;
  transition: color 0.3s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1px;
  background: var(--ink);
  transition: width 0.35s var(--ease);
}
.nav-link:hover { color: var(--ink); }
.nav-link:hover::after,
.nav-link.is-active::after { width: 100%; }
.nav-link.is-active { color: var(--ink); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px; height: 30px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 1.5px;
  background: var(--ink);
  transition: transform 0.35s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 0 80px;
  overflow: hidden;
}
.hero-inner { position: relative; z-index: 2; max-width: 760px; }

.hero-enso {
  position: absolute;
  top: 8%; right: -6%;
  width: 520px; height: 520px;
  z-index: 1;
  pointer-events: none;
  opacity: 0.55;
}
.hero-enso svg { width: 100%; height: 100%; }

.hero-eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.hero-eyebrow::before {
  content: "";
  display: inline-block;
  width: 40px; height: 1px;
  background: var(--gray);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.04em;
  margin-bottom: 36px;
}
.hero-title .ink-em {
  font-style: italic;
  color: var(--muted);
}

.hero-sub {
  font-size: 1.125rem;
  line-height: 2;
  color: var(--muted);
  max-width: 480px;
  margin-bottom: 52px;
}

.hero-actions { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }

.hero-stroke {
  position: absolute;
  left: 0; bottom: 64px;
  width: 42%; max-width: 460px;
  z-index: 1;
  opacity: 0.9;
}
.hero-stroke svg { width: 100%; display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  padding: 16px 38px;
  border: 1px solid var(--ink);
  transition: background 0.35s var(--ease), color 0.35s var(--ease),
              transform 0.35s var(--ease);
}
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: transparent; color: var(--ink); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn .arrow { transition: transform 0.35s var(--ease); }
.btn:hover .arrow { transform: translateX(5px); }

/* ---------- Services list ---------- */
.services-list { border-top: 1px solid var(--line); }
.service-item {
  display: grid;
  grid-template-columns: 80px 1fr 2fr;
  gap: 48px;
  align-items: start;
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.4s var(--ease);
}
.service-item:hover { padding-left: 16px; }
.service-num {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--gray);
  letter-spacing: 0.1em;
  padding-top: 8px;
}
.service-name {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  letter-spacing: 0.04em;
}
.service-en {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gray);
  margin-top: 8px;
}
.service-desc {
  color: var(--muted);
  line-height: 1.95;
  font-size: 0.98rem;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin-top: 18px;
}
.service-tags span {
  font-size: 0.75rem;
  color: var(--gray);
  letter-spacing: 0.06em;
}
.service-tags span + span::before {
  content: "·";
  margin-right: 10px;
  color: var(--line);
}

/* ---------- About / CTA ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}
.about-label {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--gray);
}
.about-body p {
  font-size: 1.0625rem;
  line-height: 2;
  color: var(--muted);
  margin-bottom: 22px;
}
.about-body p strong { color: var(--ink); font-weight: 500; }

.stats-row {
  display: flex;
  gap: 72px;
  margin-top: 56px;
  flex-wrap: wrap;
}
.stat .stat-num {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 400;
  line-height: 1;
}
.stat .stat-label {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gray);
  margin-top: 10px;
}

.cta-band {
  text-align: center;
  padding: 120px 0;
  border-top: 1px solid var(--line);
  position: relative;
}
.cta-band .ink-circle {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 380px; height: 380px;
  z-index: 0;
  opacity: 0.5;
}
.cta-band .container { position: relative; z-index: 2; }
.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 1.3;
  margin-bottom: 20px;
}
.cta-sub { color: var(--muted); margin-bottom: 48px; }

/* ---------- Philosophy ---------- */
.philo-list { border-top: 1px solid var(--line); }
.philo-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 32px;
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.philo-char {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  line-height: 1;
  color: var(--ink);
}
.philo-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.philo-text { color: var(--muted); line-height: 1.95; max-width: 620px; }

/* ---------- Contact · 水墨留白（左對齊錯落式） ---------- */
.contact-ink { max-width: 960px; }

.ink-label {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 40px;
}
.ink-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ink);
  flex-shrink: 0;
}

.ink-mail-wrap { position: relative; display: inline-block; }
.ink-mail {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 5.6vw, 4rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.25;
  display: inline-block;
  transition: opacity 0.3s var(--ease);
}
.ink-mail:hover { opacity: 0.55; }
.ink-brush {
  position: absolute;
  left: 4px; bottom: -16px;
  width: 52%; max-width: 320px;
  height: 16px;
  pointer-events: none;
}

.ink-rule {
  height: 1px;
  background: var(--line);
  margin-top: 80px;
}

.ink-info {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 44px 72px;
  margin-top: 72px;
}
.ink-info-item {
  border-left: 1px solid rgba(17, 17, 17, 0.18);
  padding-left: 22px;
  min-width: 210px;
  max-width: 340px;
}
/* 錯落排布：如水墨畫留白構圖，各項起手高低不一 */
.ink-info-item:nth-child(1) { margin-top: 0; }
.ink-info-item:nth-child(2) { margin-top: 40px; }
.ink-info-item:nth-child(3) { margin-top: 8px; }
.ink-info-item:nth-child(4) { margin-top: 56px; }

.ink-info-key {
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 12px;
}
.ink-info-val {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  line-height: 1.85;
  letter-spacing: 0.02em;
}
.ink-info-en {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  line-height: 1.8;
  color: var(--gray);
  text-transform: uppercase;
  margin-top: 10px;
}
.ink-note {
  margin-top: 88px;
  font-size: 0.9rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.ink-note a {
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  transition: opacity 0.3s var(--ease), border-color 0.3s var(--ease);
}
.ink-note a:hover { opacity: 0.6; border-bottom-color: var(--ink); }

/* 表單區 */
.form-block { max-width: 640px; }
.form-block .section-title { margin-bottom: 64px; }

/* Form：無邊框無底色，僅底部細線 */
.form-field { margin-bottom: 44px; }
.form-field label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gray);
  margin-bottom: 12px;
}
.form-field input,
.form-field textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  transition: border-color 0.3s var(--ease);
  resize: vertical;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: #c4c4c4; }
.form-field input:focus,
.form-field textarea:focus { outline: none; border-bottom-color: var(--ink); }
.form-field.is-error input,
.form-field.is-error textarea,
.form-field input.is-error,
.form-field textarea.is-error { border-bottom-color: var(--ink); }
.field-error {
  display: block;
  font-size: 0.8rem;
  color: var(--ink);
  margin-top: 8px;
  min-height: 1em;
  letter-spacing: 0.02em;
}
.form-success {
  display: none;
  padding: 40px 0;
  text-align: center;
}
.form-success.is-visible { display: block; }
.form-success .check {
  width: 48px; height: 48px;
  margin: 0 auto 24px;
}
.form-success p {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  letter-spacing: 0.04em;
}

/* ---------- Footer ---------- */
.footer { padding: 100px 0 56px; background: var(--bg); }
.footer-stroke { width: 100%; max-width: var(--maxw); margin: 0 auto 72px; }
.footer-stroke svg { width: 100%; display: block; }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 32px;
}
.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.16em;
  margin-bottom: 8px;
}
.footer-en {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray);
}
.footer-mail {
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--muted);
}
.footer-mail a { transition: opacity 0.3s var(--ease); }
.footer-mail a:hover { opacity: 0.6; }
.footer-copy {
  font-size: 0.82rem;
  color: var(--gray);
  letter-spacing: 0.04em;
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: 0; right: 0;
    width: 78%; max-width: 320px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 36px;
    padding: 0 48px;
    background: var(--paper);
    box-shadow: -20px 0 60px rgba(17,17,17,0.08);
    transform: translateX(100%);
    transition: transform 0.45s var(--ease);
    z-index: 99;
  }
  .nav-menu.is-open { transform: translateX(0); }
  .nav-menu .nav-link { font-size: 1.1rem; font-family: var(--font-serif); }

  .section { padding: 88px 0; }
  .container { padding: 0 24px; }

  .hero-enso { width: 320px; height: 320px; top: 4%; right: -20%; opacity: 0.4; }
  .hero-stroke { display: none; }

  .service-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 40px 0;
  }
  .service-item:hover { padding-left: 0; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }

  /* 聯絡頁：錯落偏移收斂為單列，保持可讀 */
  .ink-mail-wrap { display: block; }
  .ink-brush { width: 72%; max-width: 260px; bottom: -12px; }
  .ink-rule { margin-top: 64px; }
  .ink-info {
    flex-direction: column;
    gap: 44px;
    margin-top: 56px;
  }
  .ink-info-item { max-width: 100%; }
  .ink-info-item:nth-child(1),
  .ink-info-item:nth-child(2),
  .ink-info-item:nth-child(3),
  .ink-info-item:nth-child(4) { margin-top: 0; }
  .ink-note { margin-top: 64px; }

  .stats-row { gap: 40px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero-actions { gap: 16px; }
  .btn { padding: 14px 28px; }
  .section { padding: 72px 0; }
  .form-block .section-title { margin-bottom: 48px; }
  .form-field { margin-bottom: 36px; }
}