/* ============================================================
   OPESSA — STYLES (LIGHT THEME)
   ============================================================ */

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

:root {
  --bg:           #f8f7f5;
  --bg-2:         #f0efec;
  --bg-3:         #e8e7e3;
  --text:         #111111;
  --text-sec:     #353535;   /* darker — was #5a5a5a */
  --text-muted:   #888888;
  --accent:       #cc2b2b;   /* Opessa red */
  --accent-dark:  #aa2020;
  --border:       rgba(0, 0, 0, 0.09);
  --border-med:   rgba(0, 0, 0, 0.15);

  --radius:       14px;
  --radius-sm:    8px;
  --radius-xs:    5px;

  --font-display: 'Barlow Condensed', sans-serif;
  --font-body:    'Inter', sans-serif;

  --container:    1280px;
  --pad:          2rem;
  --section-v:    7rem;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   UTILITIES
   ============================================================ */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* Section labels — red, bold brand presence */
.section-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  font-weight: 500;
}

.section-header { margin-bottom: 3.5rem; }

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.05;
  color: var(--text);
}

/* Fade-in on scroll */
.fade-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.9rem 2.2rem;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-body);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
  margin-top: 2rem;
  align-self: flex-start;
}
.btn-primary:hover { background: var(--accent-dark); }

.btn-outline {
  display: inline-block;
  border: 1.5px solid var(--border-med);
  color: var(--text);
  text-decoration: none;
  padding: 0.82rem 2rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: background 0.2s, border-color 0.2s;
  margin-top: 2rem;
  font-weight: 500;
}
.btn-outline:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.25);
}

/* ============================================================
   NAV
   ============================================================ */

#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0.8rem 0;
  transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}

#nav.scrolled {
  background: rgba(248, 247, 245, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
  padding: 0.5rem 0;
}

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

/* Logo — scale up large, negative margin crops the baked-in PNG whitespace */
.nav-logo img {
  height: 220px;
  width: auto;
  display: block;
  margin: -45px 0;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* Nav links — strong, readable, full contrast */
.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }

/* Contact CTA — red, stands out */
.nav-links .nav-cta {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.5rem 1.35rem;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  font-weight: 500;
  transition: background 0.2s;
}
.nav-links .nav-cta:hover {
  background: var(--accent-dark);
  color: #fff;
}

/* Hamburger */
.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}
.nav-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-menu-btn.open span:nth-child(2) { opacity: 0; }
.nav-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   MOBILE MENU
   ============================================================ */

.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-menu.open { opacity: 1; pointer-events: all; }

.mobile-close {
  position: absolute;
  top: 1.5rem; right: 2rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
}

.mobile-menu ul { list-style: none; text-align: center; }
.mobile-menu ul li { margin: 1rem 0; }
.mobile-menu ul li a {
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 8vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.mobile-menu ul li a:hover { color: var(--accent); }

/* ============================================================
   HERO
   ============================================================ */

#hero {
  display: flex;
  align-items: stretch;
  min-height: 100vh;
  background: var(--bg);
  overflow: hidden;
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10.5rem var(--pad) 5rem 4rem;
  max-width: 660px;
}

.hero-eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(4rem, 8vw, 8rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 1.8rem;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-sec);
  max-width: 420px;
  line-height: 1.8;
  font-weight: 400;
}

/* Vertical video panel */
.hero-video-panel {
  width: calc(100vh * 9 / 16);
  max-width: 44vw;
  min-width: 260px;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
  background: #111;
}

.hero-video-panel video {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

/* ── AUDIO TOGGLE BUTTONS ── */
.video-audio-btn {
  position: absolute;
  background: rgba(0, 0, 0, 0.58);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 99px;
  transition: background 0.2s;
  z-index: 5;
  backdrop-filter: blur(4px);
}
.video-audio-btn:hover { background: rgba(0, 0, 0, 0.78); }

.video-audio-btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* Hero audio button — prominent, bottom-left */
.hero-audio-btn {
  bottom: 1.5rem;
  left: 1.5rem;
  padding: 0.6rem 1.1rem 0.6rem 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  font-family: var(--font-body);
  font-weight: 500;
}

/* Hide the "sound on" icon by default (video starts muted) */
.hero-audio-btn .icon-sound { display: none; }

/* Process video audio buttons — small, top-right corner */
.process-audio-btn {
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.42rem;
  width: 32px;
  height: 32px;
  justify-content: center;
}

.process-audio-btn .icon-sound { display: none; }

/* ============================================================
   STATS — red brand bar
   ============================================================ */

#stats {
  background: var(--accent);
  color: #fff;
  padding: 0;
}

.stats-row {
  display: flex;
  align-items: stretch;
}

.stat-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 2rem;
  gap: 0.35rem;
  text-align: center;
}

.stat-num {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1;
}

.stat-label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 400;
}

.stat-divider {
  width: 1px;
  background: rgba(255, 255, 255, 0.2);
  align-self: stretch;
  margin: 1.5rem 0;
}

/* ============================================================
   ABOUT
   ============================================================ */

#about {
  padding: var(--section-v) 0;
  border-top: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 6rem;
  align-items: start;
}

.about-left h2 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.2vw, 2.9rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.06;
  color: var(--text);
}

/* Body text — darker, larger, clearly readable */
.about-right p {
  color: var(--text-sec);
  margin-bottom: 1.4rem;
  font-size: 1rem;
  line-height: 1.85;
  font-weight: 400;
}
.about-right p:last-child { margin-bottom: 0; }

/* ============================================================
   TAIWAN
   ============================================================ */

#taiwan {
  padding: var(--section-v) 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.taiwan-label {
  color: var(--accent) !important;
}

.taiwan-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.taiwan-left h2 {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 0.9;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 2rem;
}

.taiwan-left p {
  color: var(--text-sec);
  font-size: 1rem;
  line-height: 1.85;
  font-weight: 400;
  margin-bottom: 1.2rem;
}

.taiwan-left p:last-child { margin-bottom: 0; }

.taiwan-right {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-top: 0.5rem;
}

.taiwan-block {
  border-top: 1px solid var(--border);
  padding-top: 1.75rem;
}

.taiwan-block-label {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
  font-weight: 500;
}

.taiwan-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.taiwan-list li {
  color: var(--text-sec);
  font-size: 0.97rem;
  font-weight: 400;
  padding-left: 1.25rem;
  position: relative;
}

.taiwan-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.taiwan-footer-note {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.8;
  font-weight: 300;
  font-style: italic;
  border-top: 1px solid var(--border);
  padding-top: 1.75rem;
}

/* ============================================================
   CAPABILITIES
   ============================================================ */

#capabilities {
  padding: var(--section-v) 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.capability-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.2rem;
  transition: box-shadow 0.2s, transform 0.2s;
  border-top: 3px solid transparent;
}
.capability-card:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
  border-top-color: var(--accent);
}

/* Numbers — red */
.cap-num {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.2rem;
  font-weight: 500;
}

.capability-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.9rem;
  line-height: 1.2;
  color: var(--text);
}

.capability-card p {
  color: var(--text-sec);
  font-size: 0.95rem;
  line-height: 1.8;
  font-weight: 400;
}

/* ============================================================
   PROCESS
   ============================================================ */

#process {
  padding: var(--section-v) 0;
  border-bottom: 1px solid var(--border);
}

.process-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.process-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Vertical video — 9:16, no cropping */
.process-video-wrap {
  aspect-ratio: 9 / 16;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-3);
  width: 100%;
  position: relative;
}

.process-video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.process-card-text { padding: 0 0.25rem; }

/* Process numbers — red */
.process-num {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.process-card-text h3 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
  line-height: 1.1;
  color: var(--text);
}

.process-card-text p {
  color: var(--text-sec);
  font-size: 0.95rem;
  line-height: 1.8;
  font-weight: 400;
}

/* ============================================================
   CERTIFICATIONS
   ============================================================ */

#certifications {
  padding: var(--section-v) 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cert-top {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
  margin-bottom: 4rem;
}

.cert-top-left h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.05;
  margin-bottom: 1.4rem;
  color: var(--text);
}

.cert-top-left p {
  color: var(--text-sec);
  font-size: 1rem;
  line-height: 1.85;
  font-weight: 400;
  margin-bottom: 1.2rem;
}

.cert-top-left p:last-child { margin-bottom: 0; }

/* Cert video — vertical 9:16 */
.cert-video-wrap {
  aspect-ratio: 9 / 16;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-3);
  position: relative;
  max-height: 520px;
}

.cert-video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Cert badges image */
.cert-badges-wrap {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3rem 4rem;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cert-badges-wrap img {
  width: 100%;
  max-width: 800px;
  height: auto;
  display: block;
}

/* 5-column cert cards */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.cert-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
  border-top: 3px solid transparent;
}

.cert-card:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
  border-top-color: var(--accent);
}

.cert-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.9rem;
  color: var(--accent);
}

.cert-card p {
  color: var(--text-sec);
  font-size: 0.875rem;
  line-height: 1.8;
  font-weight: 400;
}

/* ============================================================
   PHILOSOPHY
   ============================================================ */

#philosophy {
  padding: var(--section-v) 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.philosophy-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.2rem;
  transition: box-shadow 0.2s, transform 0.2s;
  border-top: 3px solid transparent;
}
.philosophy-card:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
  border-top-color: var(--accent);
}

.philosophy-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
  color: var(--text);
}

.philosophy-card p {
  color: var(--text-sec);
  font-size: 0.95rem;
  line-height: 1.8;
  font-weight: 400;
}

/* ============================================================
   SPECIALTIES
   ============================================================ */

#specialties { padding: var(--section-v) 0; }

.specialties-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.specialty-item {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.8rem 2rem;
  transition: background 0.2s, box-shadow 0.2s, border-color 0.2s;
  cursor: default;
}
.specialty-item:hover {
  background: var(--bg-3);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border-color: var(--border-med);
}

.specialty-item h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text);
}

.specialties-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 21 / 8;
  overflow: hidden;
  border-radius: var(--radius);
}

.specialties-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: brightness(0.68);
}

.specialties-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  padding: 2.5rem 3rem;
  background: linear-gradient(to top, rgba(0,0,0,0.45) 0%, transparent 60%);
}

.specialties-overlay p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  font-weight: 400;
  max-width: 480px;
  line-height: 1.75;
}

/* ============================================================
   CONTACT
   ============================================================ */

#contact {
  padding: var(--section-v) 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 7rem;
  align-items: start;
}

.contact-left h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.05;
  margin-bottom: 1.2rem;
  color: var(--text);
}

.contact-left > p {
  color: var(--text-sec);
  font-size: 1rem;
  line-height: 1.85;
  font-weight: 400;
  margin-bottom: 2.5rem;
}

.contact-details {
  border-top: 1px solid var(--border);
  padding-top: 1.75rem;
}

.contact-detail-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 400;
}

.detail-label {
  color: var(--text-muted);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* Form */
#contactForm {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-group label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  color: var(--text);
  padding: 0.82rem 1rem;
  font-size: 0.925rem;
  font-family: var(--font-body);
  font-weight: 400;
  outline: none;
  border-radius: var(--radius-sm);
  transition: border-color 0.2s;
  -webkit-appearance: none;
  appearance: none;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group select {
  cursor: pointer;
  color: var(--text-muted);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888888' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}
.form-group select.has-value { color: var(--text); }

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

/* Submit button — red */
.btn-submit {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.9rem 2.4rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
  align-self: flex-start;
}
.btn-submit:hover { background: var(--accent-dark); }
.btn-submit:disabled { opacity: 0.5; cursor: default; }

.form-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 1rem;
}

/* ============================================================
   FOOTER
   ============================================================ */

footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Bigger logo in footer */
.footer-logo {
  height: 44px;
  width: auto;
  display: block;
  margin-bottom: 0.6rem;
}

.footer-left p {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.footer-right p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ============================================================
   RESPONSIVE — TABLET
   ============================================================ */

@media (max-width: 1024px) {
  :root { --section-v: 5rem; }

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

  .about-grid { gap: 3.5rem; }
  .contact-grid { gap: 3.5rem; }
  .hero-content { padding-left: 3rem; }
}

/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */

@media (max-width: 768px) {
  :root {
    --section-v: 4rem;
    --pad: 1.25rem;
  }

  .nav-links { display: none; }
  .nav-menu-btn { display: flex; }
  .nav-logo img { height: 160px; margin: -35px 0; }

  #hero {
    flex-direction: column;
    min-height: auto;
  }

  .hero-content {
    padding: 7rem 1.5rem 2.5rem;
    max-width: 100%;
  }

  .hero-video-panel {
    width: 100%;
    max-width: 100%;
    aspect-ratio: 9 / 16;
    max-height: 70vh;
    position: relative;
  }

  .hero-video-panel video {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    object-fit: cover;
  }

  .stats-row { flex-wrap: wrap; }
  .stat-item { flex: 1 1 45%; padding: 1.75rem 1rem; }
  .stat-divider:nth-child(2) { display: none; }

  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .taiwan-grid { grid-template-columns: 1fr; gap: 3rem; }
  .capabilities-grid { grid-template-columns: 1fr; }

  .process-cards {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin: 0 auto;
  }

  .philosophy-grid { grid-template-columns: 1fr; }

  /* Certifications */
  .cert-top { grid-template-columns: 1fr; gap: 2rem; }
  .cert-top-right { max-width: 380px; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
  .cert-card:last-child { grid-column: 1 / -1; }
  .cert-badges-wrap { padding: 2rem; }
  .cert-grid { grid-template-columns: 1fr; }
  .cert-card:last-child { grid-column: auto; }
  .specialties-grid { grid-template-columns: 1fr 1fr; }
  .specialties-visual { aspect-ratio: 4 / 3; }

  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  #contactForm { padding: 1.75rem; }
  .form-row { grid-template-columns: 1fr; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-headline { font-size: 3.4rem; }
  .specialties-grid { grid-template-columns: 1fr; }
}