@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --color-black: #0a0a0a;
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --header-height: 80px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-main);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.7;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== Layout ========== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section--gray {
  background: var(--color-gray-50);
}

.section--dark {
  background: var(--color-gray-900);
  color: var(--color-white);
}

/* ========== Typography ========== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: 16px;
}

.section--dark .section-label {
  color: var(--color-gray-500);
}

.section-title {
  margin-bottom: 24px;
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  max-width: 640px;
  line-height: 1.8;
}

.section--dark .section-description {
  color: var(--color-gray-400);
}

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

.text-center .section-description {
  margin-left: auto;
  margin-right: auto;
}

/* ========== Buttons ========== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: var(--font-main);
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  gap: 8px;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-gray-900);
  color: var(--color-white);
  border-color: var(--color-gray-900);
}

.btn--primary:hover {
  background: var(--color-gray-700);
  border-color: var(--color-gray-700);
  opacity: 1;
}

.btn--outline {
  background: transparent;
  color: var(--color-gray-900);
  border-color: var(--color-gray-300);
}

.btn--outline:hover {
  border-color: var(--color-gray-900);
  opacity: 1;
}

.btn--white {
  background: var(--color-white);
  color: var(--color-gray-900);
}

.btn--white:hover {
  background: var(--color-gray-100);
  opacity: 1;
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn--ghost:hover {
  border-color: var(--color-white);
  opacity: 1;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ========== Header ========== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-100);
  z-index: 1000;
  transition: all var(--transition);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 0;
}

.header__logo img {
  height: 48px;
  width: auto;
}

.footer__logo-img {
  height: 52px;
  width: auto;
  filter: invert(1);
  mix-blend-mode: lighten;
  margin-bottom: 12px;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color var(--transition);
}

.header__nav a:hover {
  color: var(--color-gray-900);
  opacity: 1;
}

.header__nav a.active {
  color: var(--color-gray-900);
}

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

.header__lang {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-gray-400);
  padding: 6px 12px;
  border: 1px solid var(--color-gray-200);
  border-radius: 4px;
  transition: all var(--transition);
}

.header__lang:hover {
  color: var(--color-gray-900);
  border-color: var(--color-gray-400);
  opacity: 1;
}

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

.header__menu-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-gray-900);
  transition: all var(--transition);
}

/* Mobile menu */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  z-index: 999;
  padding: 32px 24px;
  flex-direction: column;
  gap: 8px;
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav a {
  font-size: 1.125rem;
  font-weight: 500;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-gray-100);
  color: var(--color-gray-600);
}

.mobile-nav a:hover {
  color: var(--color-gray-900);
  opacity: 1;
}

.mobile-nav .btn {
  margin-top: 16px;
}

/* ========== Hero ========== */

.hero {
  padding-top: calc(var(--header-height) + 80px);
  padding-bottom: 96px;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero__content {
  max-width: 720px;
}

.hero__headline {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero__sub {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-gray-500);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 560px;
}

/* ========== Grid ========== */

.grid {
  display: grid;
  gap: 32px;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ========== Cards ========== */

.card {
  padding: 40px;
  border: 1px solid var(--color-gray-200);
  border-radius: 8px;
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--color-gray-400);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-900);
  color: var(--color-white);
  border-radius: 10px;
  margin-bottom: 24px;
  font-size: 1.25rem;
}

.card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card__text {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ========== Steps ========== */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  counter-reset: step;
}

.step {
  counter-increment: step;
  position: relative;
  padding-top: 48px;
}

.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-gray-400);
  letter-spacing: 0.05em;
}

.step__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step__text {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ========== Problem Grid ========== */

.problem-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.problem-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 8px;
}

.problem-item__icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-400);
  font-size: 1.25rem;
}

.problem-item__text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-700);
}

/* ========== Differentiators ========== */

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

.diff-item {
  text-align: center;
  padding: 32px 16px;
}

.diff-item__label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: 8px;
}

.diff-item__text {
  font-size: 1rem;
  font-weight: 500;
}

.section--dark .diff-item__text {
  color: var(--color-white);
}

/* ========== CTA Section ========== */

.cta-section {
  padding: 96px 0;
  text-align: center;
}

.cta-section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 32px;
}

.section--dark .cta-section__title {
  color: var(--color-white);
}

/* ========== Service Detail ========== */

.service-block {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.service-block:last-child {
  border-bottom: none;
}

.service-block__header {
  margin-bottom: 48px;
}

.service-block__tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: 12px;
}

.service-block__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.service-block__desc {
  font-size: 1.0625rem;
  color: var(--color-gray-500);
  max-width: 640px;
  line-height: 1.8;
}

.service-block__quote {
  font-size: 1.25rem;
  font-weight: 500;
  font-style: italic;
  color: var(--color-gray-700);
  border-left: 3px solid var(--color-gray-900);
  padding-left: 24px;
  margin: 40px 0;
  max-width: 640px;
}

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

.pillar {
  padding: 32px;
  border: 1px solid var(--color-gray-200);
  border-radius: 8px;
}

.pillar__number {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-gray-300);
  margin-bottom: 16px;
}

.pillar__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.pillar__text {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* Engagement models */
.engagement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.engagement-item {
  padding: 32px;
  background: var(--color-gray-50);
  border-radius: 8px;
}

.engagement-item__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.engagement-item__text {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ========== Contact ========== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-info__title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.contact-info__text {
  font-size: 1.0625rem;
  color: var(--color-gray-500);
  line-height: 1.8;
  margin-bottom: 32px;
}

.contact-detail {
  margin-bottom: 24px;
}

.contact-detail__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: 4px;
}

.contact-detail__value {
  font-size: 1rem;
  font-weight: 500;
}

.contact-detail__value a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ========== Contact Form ========== */

.contact-form {
  padding: 48px;
  background: var(--color-gray-50);
  border-radius: 8px;
}

.contact-form__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-form__desc {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  margin-bottom: 32px;
  line-height: 1.7;
}

.form-group {
  margin-bottom: 20px;
}

.form-group:last-of-type {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: 6px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9375rem;
  font-family: var(--font-main);
  color: var(--color-gray-900);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 6px;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-gray-400);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.04);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-gray-400);
}

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

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23737373' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-submit {
  margin-top: 28px;
}

.form-submit .btn {
  width: 100%;
}

.form-success {
  display: none;
  text-align: center;
  padding: 48px 24px;
}

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

.form-success__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-900);
  color: var(--color-white);
  border-radius: 50%;
}

.form-success__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-success__text {
  font-size: 0.9375rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 32px 24px; }
}

/* ========== Footer ========== */

.footer {
  padding: 64px 0 32px;
  background: var(--color-gray-900);
  color: var(--color-gray-400);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer__tagline {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  max-width: 280px;
  line-height: 1.6;
}

.footer__nav {
  display: flex;
  gap: 48px;
}

.footer__nav-group h4 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: 16px;
}

.footer__nav-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__nav-group li a {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  transition: color var(--transition);
}

.footer__nav-group li a:hover {
  color: var(--color-white);
  opacity: 1;
}

.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--color-gray-600);
}

/* ========== Page Header ========== */

.page-header {
  padding-top: calc(var(--header-height) + 64px);
  padding-bottom: 64px;
  border-bottom: 1px solid var(--color-gray-200);
}

.page-header__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.page-header__desc {
  font-size: 1.125rem;
  color: var(--color-gray-500);
  max-width: 640px;
}

/* ========== Privacy / Legal ========== */

.legal-content {
  max-width: 760px;
  padding: 64px 0;
}

.legal-content h2 {
  font-size: 1.25rem;
  margin-top: 48px;
  margin-bottom: 16px;
}

.legal-content p {
  color: var(--color-gray-600);
  margin-bottom: 16px;
  line-height: 1.8;
}

.legal-content ul {
  color: var(--color-gray-600);
  margin-bottom: 16px;
  padding-left: 24px;
  line-height: 2;
}

/* ========== Hero Split Layout ========== */

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__visual svg {
  width: 100%;
  max-width: 480px;
  height: auto;
}

/* ========== Image Utilities ========== */

.img-grayscale {
  filter: grayscale(100%);
  transition: filter 0.5s ease;
}

.img-grayscale:hover {
  filter: grayscale(50%);
}

.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-rounded {
  border-radius: 8px;
  overflow: hidden;
}

.aspect-video {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 8px;
}

.aspect-square {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 8px;
}

/* ========== Service Block with Image ========== */

.service-block__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.service-block__image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 8px;
}

.service-block__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.5s ease;
}

.service-block__image:hover img {
  filter: grayscale(40%);
}

/* ========== Card with Image ========== */

.card--has-image .card__image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 6px;
  margin-bottom: 24px;
}

.card--has-image .card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.5s ease;
}

.card--has-image:hover .card__image img {
  filter: grayscale(40%);
}

/* ========== CTA with Background ========== */

.cta-section--visual {
  position: relative;
  overflow: hidden;
}

.cta-section--visual .cta-bg-pattern {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  opacity: 0.06;
  pointer-events: none;
}

/* ========== Responsive ========== */

@media (max-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }
  .diff-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero { min-height: auto; padding-top: calc(var(--header-height) + 48px); padding-bottom: 64px; }
  .hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .hero__visual { order: -1; }
  .hero__visual svg { max-width: 320px; }

  .header__nav { display: none; }
  .header__menu-btn { display: flex; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .steps { grid-template-columns: 1fr; }
  .pillar-grid { grid-template-columns: 1fr; }
  .diff-grid { grid-template-columns: 1fr; }
  .problem-list { grid-template-columns: 1fr; }
  .engagement-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .service-block__grid { grid-template-columns: 1fr; gap: 32px; }

  [style*="grid-template-columns: 280px"] { grid-template-columns: 1fr !important; }
  [style*="grid-template-columns: 1fr 1fr"] { grid-template-columns: 1fr !important; }

  .footer__inner { flex-direction: column; }
  .footer__nav { flex-direction: column; gap: 32px; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
}