/* =========================================================
   BigBlueWave – Main Stylesheet
   ========================================================= */

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

:root {
  --clr-navy:    #0b1f3a;
  --clr-blue:    #1565c0;
  --clr-blue-md: #1976d2;
  --clr-blue-lt: #42a5f5;
  --clr-wave:    #00b0ff;
  --clr-accent:  #00e5ff;
  --clr-white:   #ffffff;
  --clr-light:   #f0f6ff;
  --clr-gray:    #6b7a92;
  --clr-border:  #dce8f8;
  --clr-dark:    #0d1b2a;

  --ff-main: 'Pretendard', 'Inter', sans-serif;
  --fw-light: 300;
  --fw-reg:   400;
  --fw-med:   500;
  --fw-semi:  600;
  --fw-bold:  700;
  --fw-xbold: 800;

  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  22px;
  --radius-xl:  36px;

  --shadow-sm:  0 2px 10px rgba(21,101,192,.08);
  --shadow-md:  0 8px 32px rgba(21,101,192,.14);
  --shadow-lg:  0 20px 60px rgba(11,31,58,.18);

  --transition: .3s ease;
  --max-w: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--ff-main);
  color: var(--clr-navy);
  background: var(--clr-white);
  line-height: 1.7;
  overflow-x: hidden;
}

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

/* ── Container ── */
.container {
  width: 92%;
  max-width: var(--max-w);
  margin: 0 auto;
}

/* ── Section Shared ── */
.section { padding: 100px 0; }

.section-tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: var(--fw-semi);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--clr-blue);
  background: rgba(21,101,192,.1);
  border-radius: 999px;
  padding: 4px 16px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: var(--fw-xbold);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--clr-gray);
  max-width: 640px;
  margin-bottom: 56px;
}

.highlight {
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: .97rem;
  font-weight: var(--fw-semi);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  color: var(--clr-white);
  box-shadow: 0 4px 20px rgba(21,101,192,.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(21,101,192,.45);
}

.btn-outline {
  border: 2px solid rgba(255,255,255,.6);
  color: var(--clr-white);
  background: rgba(255,255,255,.1);
  backdrop-filter: blur(6px);
}
.btn-outline:hover {
  background: rgba(255,255,255,.2);
  border-color: var(--clr-white);
  transform: translateY(-2px);
}

.btn-service {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: var(--fw-semi);
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-blue-lt));
  color: var(--clr-white);
  transition: all var(--transition);
  margin-top: 24px;
}
.btn-service:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-service--ai {
  background: linear-gradient(135deg, #6a1b9a, #29b6f6);
}

/* =========================================================
   HEADER
   ========================================================= */
.header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  z-index: 999;
  padding: 18px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.header.scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: baseline; gap: 1px; font-size: 1.55rem; font-weight: var(--fw-xbold); }
.logo-big  { color: var(--clr-navy); }
.logo-blue { color: var(--clr-blue); }
.logo-wave { color: var(--clr-wave); }

.header.scrolled .logo-big { color: var(--clr-navy); }

/* nav */
.nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: .95rem;
  font-weight: var(--fw-med);
  color: rgba(255,255,255,.85);
  transition: color var(--transition);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--clr-wave);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav-link:hover { color: var(--clr-white); }
.nav-link:hover::after { width: 100%; }

.header.scrolled .nav-link { color: var(--clr-navy); }
.header.scrolled .nav-link:hover { color: var(--clr-blue); }

.nav-cta {
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  color: var(--clr-white) !important;
  padding: 9px 22px;
  border-radius: 999px;
  font-weight: var(--fw-semi);
}
.nav-cta::after { display: none; }
.nav-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: all var(--transition);
}
.header.scrolled .hamburger span { background: var(--clr-navy); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, var(--clr-navy) 0%, #0d2e5e 55%, #133a7a 100%);
  overflow: hidden;
  padding-top: 80px;
}

/* Animated waves */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.wave {
  position: absolute;
  bottom: -30px;
  left: -50%;
  width: 200%;
  height: 220px;
  border-radius: 50%;
  opacity: .18;
  animation: waveAnim 10s linear infinite;
}
.wave1 { background: var(--clr-blue-lt); animation-duration: 9s; bottom: -20px; }
.wave2 { background: var(--clr-wave);    animation-duration: 12s; animation-delay: -3s; bottom: -50px; opacity: .12; }
.wave3 { background: var(--clr-accent);  animation-duration: 15s; animation-delay: -6s; bottom: -70px; opacity: .08; }

@keyframes waveAnim {
  0%   { transform: translateX(0)    rotateZ(0deg); }
  50%  { transform: translateX(-25%) rotateZ(1deg); }
  100% { transform: translateX(0)    rotateZ(0deg); }
}

/* Particle dots bg */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(66,165,245,.18) 1px, transparent 1px),
    radial-gradient(circle, rgba(0,176,255,.12) 1px, transparent 1px);
  background-size: 50px 50px, 80px 80px;
  background-position: 0 0, 25px 25px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 0 100px;
}

.hero-eyebrow {
  font-size: .85rem;
  font-weight: var(--fw-semi);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: var(--fw-xbold);
  color: var(--clr-white);
  line-height: 1.18;
  margin-bottom: 24px;
}
.hero-title em {
  font-style: normal;
  color: var(--clr-blue-lt);
}
.hero-title strong {
  font-style: normal;
  background: linear-gradient(90deg, var(--clr-wave), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.12rem;
  color: rgba(255,255,255,.72);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.75;
}

.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.hero-scroll-hint span {
  display: block;
  width: 24px; height: 38px;
  border: 2px solid rgba(255,255,255,.4);
  border-radius: 12px;
  position: relative;
}
.hero-scroll-hint span::before {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: rgba(255,255,255,.6);
  border-radius: 2px;
  animation: scrollHint 2s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { opacity: 1; top: 6px; }
  50%       { opacity: 0; top: 18px; }
}

/* ── Animate-up ── */
.animate-up {
  opacity: 0;
  transform: translateY(30px);
  animation: animUp .7s ease forwards;
}
.delay-1 { animation-delay: .15s; }
.delay-2 { animation-delay: .3s; }
.delay-3 { animation-delay: .45s; }

@keyframes animUp {
  to { opacity: 1; transform: none; }
}

/* ── Reveal on scroll ── */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity .65s ease, transform .65s ease;
}
.reveal.visible { opacity: 1; transform: none; }
.reveal.delay-1 { transition-delay: .12s; }
.reveal.delay-2 { transition-delay: .24s; }
.reveal.delay-3 { transition-delay: .36s; }

/* =========================================================
   ABOUT
   ========================================================= */
.about { background: var(--clr-white); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 72px;
}

.about-card {
  background: var(--clr-light);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.about-icon {
  width: 58px; height: 58px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 22px;
  font-size: 1.4rem;
  color: var(--clr-white);
  box-shadow: 0 6px 18px rgba(21,101,192,.3);
}

.about-card h3 {
  font-size: 1.15rem;
  font-weight: var(--fw-bold);
  margin-bottom: 12px;
}

.about-card p {
  font-size: .95rem;
  color: var(--clr-gray);
  line-height: 1.7;
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: linear-gradient(135deg, var(--clr-navy), #133a7a);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
}

.stat-item { text-align: center; }

.stat-num {
  font-size: 3rem;
  font-weight: var(--fw-xbold);
  color: var(--clr-white);
  line-height: 1;
}
.stat-unit {
  font-size: 1.8rem;
  font-weight: var(--fw-xbold);
  color: var(--clr-wave);
}

.stat-item p {
  font-size: .88rem;
  color: rgba(255,255,255,.6);
  margin-top: 8px;
  font-weight: var(--fw-med);
}

/* =========================================================
   SERVICES
   ========================================================= */
.services {
  background: var(--clr-light);
  position: relative;
  overflow: hidden;
}
.services::before {
  content: '';
  position: absolute;
  top: -120px; right: -160px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(21,101,192,.07) 0%, transparent 70%);
  pointer-events: none;
}

.service-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 72px;
}

.service-card {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--clr-border);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.service-card-inner { padding: 44px 40px; position: relative; }

.service-badge {
  position: absolute;
  top: 28px; right: 32px;
  font-size: 3.5rem;
  font-weight: var(--fw-xbold);
  color: rgba(21,101,192,.06);
  line-height: 1;
  user-select: none;
}

.service-icon-wrap {
  width: 72px; height: 72px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
  color: var(--clr-white);
  margin-bottom: 28px;
  box-shadow: 0 8px 24px rgba(21,101,192,.3);
}

.service-card--ai .service-icon-wrap {
  background: linear-gradient(135deg, #6a1b9a, #29b6f6);
  box-shadow: 0 8px 24px rgba(106,27,154,.3);
}

.service-card h3 {
  font-size: 1.55rem;
  font-weight: var(--fw-bold);
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--clr-navy);
}

.service-desc {
  font-size: .97rem;
  color: var(--clr-gray);
  line-height: 1.75;
  margin-bottom: 24px;
}

.service-list { display: flex; flex-direction: column; gap: 10px; }

.service-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .93rem;
  color: var(--clr-navy);
}

.service-list li i {
  color: var(--clr-blue);
  font-size: .8rem;
  margin-top: 4px;
  flex-shrink: 0;
}

.service-card--ai .service-list li i { color: #9c27b0; }

/* Process */
.process-section {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--clr-border);
  text-align: center;
}

.process-title {
  font-size: 1.2rem;
  font-weight: var(--fw-bold);
  color: var(--clr-navy);
  margin-bottom: 36px;
}

.process-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  min-width: 110px;
}

.step-num {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  color: var(--clr-white);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  font-weight: var(--fw-bold);
  box-shadow: 0 4px 14px rgba(21,101,192,.3);
}

.step-label {
  font-size: .85rem;
  color: var(--clr-gray);
  text-align: center;
  font-weight: var(--fw-med);
  line-height: 1.5;
}

.process-arrow {
  color: var(--clr-blue-lt);
  font-size: 1.1rem;
  opacity: .7;
  margin-bottom: 28px;
}

/* =========================================================
   WHY US
   ========================================================= */
.why { background: var(--clr-white); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.why-card {
  background: var(--clr-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid var(--clr-border);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-align: center;
}
.why-card:hover {
  transform: translateY(-6px);
  background: linear-gradient(160deg, #e8f0fe, #e3f8ff);
  box-shadow: var(--shadow-md);
}

.why-icon {
  width: 60px; height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  color: var(--clr-white);
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(21,101,192,.25);
}

.why-card h4 {
  font-size: 1.05rem;
  font-weight: var(--fw-bold);
  margin-bottom: 12px;
  color: var(--clr-navy);
}

.why-card p {
  font-size: .9rem;
  color: var(--clr-gray);
  line-height: 1.65;
}

/* Testimonials */
.testimonial-section { margin-top: 20px; }

.testimonial-title {
  font-size: 1.3rem;
  font-weight: var(--fw-bold);
  text-align: center;
  margin-bottom: 36px;
  color: var(--clr-navy);
}

.testimonial-slider {
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.testimonial-track {
  display: flex;
  transition: transform .5s ease;
}

.testimonial-item {
  min-width: 100%;
  background: linear-gradient(135deg, var(--clr-navy), #133a7a);
  border-radius: var(--radius-lg);
  padding: 48px 52px;
  color: var(--clr-white);
}

.t-quote {
  font-size: 2rem;
  color: var(--clr-wave);
  margin-bottom: 20px;
  opacity: .8;
}

.testimonial-item p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(255,255,255,.88);
  margin-bottom: 28px;
  font-style: italic;
}

.t-author {
  display: flex;
  align-items: center;
  gap: 16px;
}

.t-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  color: var(--clr-white);
}

.t-author strong { display: block; font-weight: var(--fw-semi); }
.t-author span   { font-size: .85rem; color: rgba(255,255,255,.55); }

.testimonial-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--clr-border);
  transition: background var(--transition), transform var(--transition);
}
.dot.active {
  background: var(--clr-blue);
  transform: scale(1.3);
}

/* =========================================================
   CONTACT
   ========================================================= */
.contact { background: var(--clr-light); }

.contact-wrap {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: start;
}

/* Info */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: linear-gradient(160deg, var(--clr-navy), #133a7a);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  color: var(--clr-white);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.contact-info-item i {
  font-size: 1.1rem;
  color: var(--clr-wave);
  width: 22px;
  margin-top: 3px;
  flex-shrink: 0;
}

.contact-info-item strong {
  display: block;
  font-size: .85rem;
  font-weight: var(--fw-semi);
  color: rgba(255,255,255,.55);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.contact-info-item span {
  font-size: .97rem;
  color: rgba(255,255,255,.9);
}

/* Form */
.contact-form {
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--clr-border);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form-group { display: flex; flex-direction: column; gap: 7px; margin-bottom: 20px; }

.form-group label {
  font-size: .9rem;
  font-weight: var(--fw-med);
  color: var(--clr-navy);
}

.req { color: #e53935; }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font-family: var(--ff-main);
  font-size: .95rem;
  color: var(--clr-navy);
  background: var(--clr-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--clr-blue-md);
  box-shadow: 0 0 0 3px rgba(21,101,192,.12);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: #e53935;
}

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

.form-error {
  font-size: .82rem;
  color: #e53935;
  min-height: 1rem;
}

.btn-submit {
  width: 100%;
  justify-content: center;
  padding: 15px;
  font-size: 1rem;
  margin-top: 4px;
}

.form-success {
  display: none;
  margin-top: 18px;
  padding: 14px 20px;
  background: #e8f5e9;
  border-radius: var(--radius-sm);
  color: #2e7d32;
  font-weight: var(--fw-med);
  font-size: .95rem;
  align-items: center;
  gap: 10px;
}
.form-success.visible { display: flex; }

/* =========================================================
   FOOTER
   ========================================================= */
.footer {
  background: var(--clr-dark);
  padding-top: 72px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.footer-brand .logo-big  { color: var(--clr-white); font-size: 1.45rem; font-weight: var(--fw-xbold); }
.footer-brand .logo-blue { color: var(--clr-blue-lt); font-size: 1.45rem; font-weight: var(--fw-xbold); }
.footer-brand .logo-wave { color: var(--clr-wave);    font-size: 1.45rem; font-weight: var(--fw-xbold); }

.footer-brand p {
  font-size: .88rem;
  color: rgba(255,255,255,.45);
  margin-top: 16px;
  line-height: 1.7;
}

.footer-links h5,
.footer-contact h5 {
  font-size: .85rem;
  font-weight: var(--fw-semi);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255,255,255,.45);
  margin-bottom: 20px;
}

.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links ul li a {
  font-size: .9rem;
  color: rgba(255,255,255,.65);
  transition: color var(--transition);
}
.footer-links ul li a:hover { color: var(--clr-wave); }

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
  color: rgba(255,255,255,.65);
  margin-bottom: 10px;
}
.footer-contact p i { color: var(--clr-wave); width: 16px; }

.social-links {
  display: flex;
  gap: 14px;
  margin-top: 20px;
}
.social-links a {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: 1rem;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.social-links a:hover {
  background: var(--clr-blue);
  color: var(--clr-white);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: .85rem;
  color: rgba(255,255,255,.3);
}

/* =========================================================
   SCROLL TO TOP
   ========================================================= */
.scroll-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-blue), var(--clr-wave));
  color: var(--clr-white);
  font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition);
}
.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
.scroll-top:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 1024px) {
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid .about-card:last-child { grid-column: 1 / -1; max-width: 480px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 40px 48px; }
  .contact-wrap { grid-template-columns: 1fr; }
  .contact-info { flex-direction: row; flex-wrap: wrap; gap: 20px; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  /* Nav */
  .hamburger { display: flex; }
  .nav {
    position: fixed;
    top: 0; right: -100%;
    width: 280px; height: 100vh;
    background: var(--clr-navy);
    padding: 88px 32px 40px;
    transition: right var(--transition);
    z-index: 99;
    box-shadow: -8px 0 30px rgba(0,0,0,.25);
  }
  .nav.open { right: 0; }
  .nav-list { flex-direction: column; gap: 28px; }
  .nav-link { color: rgba(255,255,255,.8); font-size: 1.1rem; }
  .nav-link:hover { color: var(--clr-white); }

  /* Hero */
  .hero-title { font-size: 2.4rem; }
  .hero-desc  { font-size: 1rem; }
  .hero-btns  { flex-direction: column; align-items: flex-start; gap: 12px; }

  /* About */
  .about-grid { grid-template-columns: 1fr; }
  .about-grid .about-card:last-child { max-width: 100%; grid-column: auto; }
  .stats-row  { grid-template-columns: repeat(2, 1fr); gap: 20px; padding: 36px 24px; }

  /* Services */
  .service-cards { grid-template-columns: 1fr; }
  .service-card-inner { padding: 36px 28px; }
  .process-steps { gap: 8px; }
  .process-arrow { display: none; }
  .process-steps { display: grid; grid-template-columns: repeat(2,1fr); }

  /* Why */
  .why-grid { grid-template-columns: 1fr; }
  .testimonial-item { padding: 36px 28px; }

  /* Contact */
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 32px 24px; }

  /* Footer */
  .footer-inner { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .stat-num { font-size: 2.2rem; }
  .scroll-top { bottom: 20px; right: 20px; }
}