/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue-start: #2563eb;
  --blue-end:   #06b6d4;
  --blue-mid:   #3b82f6;
  --dark:       #060a12;
  --dark-2:     #0d1424;
  --dark-3:     #111827;
  --card-bg:    #131c2e;
  --card-border:#1e2d47;
  --text:       #f0f4ff;
  --text-muted: #8da0bf;
  --accent:     #3b82f6;
  --accent-2:   #06b6d4;
  --radius:     16px;
  --transition: 0.35s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans KR', 'Inter', sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== TYPOGRAPHY ===== */
.section-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  text-align: center;
}
.section-title.left { text-align: left; }

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 60px;
  line-height: 1.8;
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.delay-1 { transition-delay: 0.15s !important; }
.delay-2 { transition-delay: 0.3s !important; }

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-block;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50px;
  transition: var(--transition);
  box-shadow: 0 4px 30px rgba(37,99,235,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(37,99,235,0.6);
}

.btn-secondary {
  display: inline-block;
  padding: 14px 32px;
  border: 2px solid var(--accent);
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 50px;
  transition: var(--transition);
  margin-top: 24px;
}
.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

/* ===== NAV ===== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: background 0.4s, box-shadow 0.4s;
}
#navbar.scrolled {
  background: rgba(6,10,18,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
  background: linear-gradient(90deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-img {
  height: 44px;
  width: 44px;
  object-fit: contain;
  border-radius: 50%;
  display: block;
}
.nav-links {
  display: flex;
  gap: 32px;
  flex: 1;
}
.nav-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition);
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); }

.nav-cta {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  transition: var(--transition);
  box-shadow: 0 2px 16px rgba(37,99,235,0.35);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(37,99,235,0.5); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0;
  background: rgba(6,10,18,0.98);
  padding: 12px 24px 24px;
}
.nav-mobile.open { display: flex; }
.mobile-link {
  padding: 14px 0;
  font-size: 1rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--card-border);
  font-weight: 500;
}
.mobile-link:last-child { border-bottom: none; }
.mobile-link.cta {
  margin-top: 12px;
  text-align: center;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  color: #fff;
  border-radius: 50px;
  padding: 14px;
  font-weight: 700;
  border-bottom: none;
}

/* ===== HERO ===== */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(37,99,235,0.25) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(6,182,212,0.15) 0%, transparent 60%),
    var(--dark);
}
#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563eb' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

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

.hero-label {
  font-size: 0.85rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #fff 0%, rgba(255,255,255,0.75) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 20px;
  margin-top: 72px;
  flex-wrap: wrap;
  justify-content: center;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 36px;
  text-align: center;
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  backdrop-filter: blur(8px);
}

.stat-num {
  display: block;
  font-size: 2.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-plus {
  font-size: 1.4rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.scroll-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: scrollBounce 1.5s ease-in-out infinite;
  box-shadow: 0 0 10px var(--accent);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.5; }
}

/* ===== PROBLEM ===== */
#problem {
  padding: 120px 0;
  background: var(--dark-2);
}

#problem .section-title,
#problem .section-sub,
#problem .section-label { text-align: left; }

.problem-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.problem-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

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

.problem-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.problem-card:hover::before { opacity: 1; }

.problem-num {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 20px;
  opacity: 0.6;
}

.problem-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #fff;
}

.problem-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.9;
}

.problem-card strong { color: var(--text); }

.problem-card blockquote {
  margin: 16px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: rgba(59,130,246,0.08);
  border-radius: 0 8px 8px 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  font-style: normal;
  line-height: 1.6;
}

/* ===== SERVICES ===== */
#services {
  padding: 120px 0;
  background: var(--dark);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.05), rgba(6,182,212,0.05));
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  border-color: rgba(59,130,246,0.5);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(37,99,235,0.15);
}
.service-card:hover::after { opacity: 1; }

.service-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.service-card p {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.9;
}

/* ===== PRICING ===== */
#pricing {
  padding: 120px 0;
  background: var(--dark-2);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  position: relative;
  transition: var(--transition);
}

.pricing-card.featured {
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(6,182,212,0.08));
  border-color: rgba(59,130,246,0.5);
  box-shadow: 0 0 60px rgba(37,99,235,0.15);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59,130,246,0.4);
}

.plan-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 18px;
  border-radius: 50px;
  white-space: nowrap;
  letter-spacing: 1px;
}

.plan-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.plan-name {
  font-size: 1.6rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 28px;
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
}

.plan-features li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.93rem;
  color: var(--text);
  line-height: 1.5;
}

.plan-features li small {
  display: block;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding-left: 20px;
}

.check {
  color: var(--accent-2);
  font-weight: 700;
  margin-right: 8px;
}

.btn-plan {
  display: block;
  text-align: center;
  padding: 15px;
  border: 2px solid var(--accent);
  color: var(--accent);
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
}

.btn-plan:hover,
.btn-plan.featured {
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 24px rgba(37,99,235,0.4);
}

.pricing-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 32px;
}

/* ===== ABOUT ===== */
#about {
  padding: 120px 0;
  background: var(--dark);
  position: relative;
  overflow: hidden;
}

#about::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text p {
  color: var(--text-muted);
  font-size: 0.97rem;
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-video {
  position: relative;
}

.video-placeholder {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.video-inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-coming {
  text-align: center;
  color: var(--text-muted);
}

.video-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 16px;
  box-shadow: 0 0 40px rgba(37,99,235,0.4);
}

.video-coming p {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.video-coming small {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* YouTube Video Embed */
.video-embed {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius);
}

/* ===== TESTIMONIALS ===== */
#testimonials {
  padding: 120px 0;
  background: var(--dark-2);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: rgba(59,130,246,0.4);
  transform: translateY(-4px);
}

.quote-mark {
  font-size: 5rem;
  line-height: 0.6;
  font-family: Georgia, serif;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  display: block;
}

.testimonial-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 24px;
}

.testimonial-card strong { color: var(--text); }

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}

.testimonial-author strong { display: block; font-size: 0.95rem; color: var(--text); }
.testimonial-author small { display: block; font-size: 0.8rem; color: var(--text-muted); margin-top: 2px; }

/* ===== CONTACT ===== */
#contact {
  padding: 120px 0;
  background: var(--dark);
  position: relative;
  overflow: hidden;
}

#contact::before {
  content: '';
  position: absolute;
  bottom: -200px; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 500px;
  background: radial-gradient(ellipse, rgba(37,99,235,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.contact-form {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: relative;
  z-index: 1;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form-group label {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--text);
}

.required { color: var(--accent-2); }
.optional { color: var(--text-muted); font-weight: 400; font-size: 0.85rem; }

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group textarea {
  background: var(--card-bg);
  border: 1.5px solid var(--card-border);
  border-radius: 10px;
  padding: 16px 20px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

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

/* Radio Groups */
.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.radio-label input[type="radio"],
.radio-label input[type="checkbox"] { display: none; }

.radio-label span {
  padding: 10px 20px;
  background: var(--card-bg);
  border: 1.5px solid var(--card-border);
  border-radius: 50px;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: var(--transition);
  white-space: nowrap;
}

.radio-label input[type="radio"]:checked + span,
.radio-label input[type="checkbox"]:checked + span {
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 12px rgba(37,99,235,0.3);
}

.radio-label span:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* Submit */
.btn-submit {
  padding: 18px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 30px rgba(37,99,235,0.4);
  font-family: inherit;
  letter-spacing: 0.5px;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(37,99,235,0.6);
}

.btn-submit:active { transform: translateY(0); }

/* Success message */
.form-success {
  display: none;
  text-align: center;
  padding: 40px;
  background: var(--card-bg);
  border: 1px solid rgba(6,182,212,0.4);
  border-radius: var(--radius);
}

.form-success.visible { display: block; }

.success-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--blue-start), var(--blue-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin: 0 auto 16px;
  animation: popIn 0.5s cubic-bezier(.4,0,.2,1);
}

@keyframes popIn {
  0% { transform: scale(0); }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.form-success p {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

/* ===== FOOTER ===== */
footer {
  background: var(--dark-2);
  border-top: 1px solid var(--card-border);
  padding: 48px 0;
  text-align: center;
}

.footer-brand {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--blue-start), var(--blue-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.footer-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.5;
}

.footer-biz {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
  font-size: 0.78rem;
  color: var(--text-muted);
  opacity: 0.55;
  margin-bottom: 12px;
}

/* ===== RESPONSIVE - 태블릿 ===== */
@media (max-width: 900px) {
  .about-inner { grid-template-columns: 1fr; gap: 48px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-cta { display: none; }
  .container { padding: 0 20px; }

  #hero { padding: 100px 20px 60px; }
  .hero-title { font-size: 3rem; }

  #problem, #services, #about, #testimonials, #contact { padding: 80px 0; }

  .section-title { font-size: 2.2rem; }
  .pricing-grid { grid-template-columns: 1fr; }
}

/* ===== RESPONSIVE - 모바일 ===== */
@media (max-width: 640px) {
  .container { padding: 0 16px; }

  /* 네비 */
  .nav-inner { padding: 0 16px; }

  /* 히어로 */
  #hero { padding: 88px 16px 56px; min-height: 90vh; }
  .hero-title { font-size: 2.2rem; line-height: 1.15; }
  .hero-label { font-size: 0.75rem; letter-spacing: 2px; }
  .hero-sub { font-size: 0.95rem; }
  .btn-primary { font-size: 0.95rem; padding: 15px 28px; }

  /* 공통 섹션 */
  #problem, #services, #about, #testimonials, #contact { padding: 64px 0; }
  .section-title { font-size: 1.75rem; line-height: 1.25; }
  .section-sub { font-size: 0.9rem; }

  /* 문제 섹션 */
  .problem-cards { grid-template-columns: 1fr; gap: 16px; }
  .problem-card { padding: 28px 24px; }
  .problem-num { font-size: 2.2rem; }

  /* 서비스 */
  .service-grid { grid-template-columns: 1fr; gap: 16px; }
  .service-card { padding: 28px 24px; }

  /* About */
  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .section-title.left { font-size: 1.75rem; }
  .about-text p { font-size: 0.92rem; }
  .btn-secondary { font-size: 0.9rem; padding: 13px 28px; }

  /* 후기 */
  .testimonial-grid { grid-template-columns: 1fr; gap: 16px; }
  .testimonial-card { padding: 28px 22px; }
  .quote-mark { font-size: 3.5rem; }
  .testimonial-card p { font-size: 0.9rem; }

  /* 폼 */
  .contact-form { gap: 20px; }
  .form-group label { font-size: 0.93rem; }
  .form-group input[type="text"],
  .form-group input[type="tel"],
  .form-group textarea { padding: 13px 16px; font-size: 0.9rem; }
  .radio-group { gap: 8px; }
  .radio-label span { padding: 9px 16px; font-size: 0.83rem; }
  .btn-submit { font-size: 0.97rem; padding: 16px; }

  /* 성공 메시지 */
  .form-success { padding: 32px 20px; }
  .form-success h3 { font-size: 1.2rem; }
  .form-success p { font-size: 0.95rem; }

  /* 푸터 */
  .footer-biz { flex-direction: column; align-items: center; gap: 4px; }
  .footer-biz span { text-align: center; }
}

/* ===== 아주 작은 화면 (360px 이하) ===== */
@media (max-width: 380px) {
  .hero-title { font-size: 1.9rem; }
  .section-title { font-size: 1.55rem; }
  .radio-label span { padding: 8px 12px; font-size: 0.78rem; }
}

/* ===== 모바일 텍스트 중앙 정렬 ===== */
@media (max-width: 640px) {
  .section-title,
  .section-title.left,
  .section-sub,
  .section-label,
  .about-text p,
  .hero-title,
  .hero-sub,
  .hero-label,
  .problem-card h3,
  .problem-card p,
  .service-card h3,
  .service-card p {
    text-align: center;
  }

  #problem .section-title,
  #problem .section-sub,
  #problem .section-label {
    text-align: center;
  }

  .radio-group { justify-content: center; }
  .about-text .btn-secondary { display: block; text-align: center; }
}