/* =========================================================
   Nexfila — Design tokens
   Simple / Clean / Professional
   ========================================================= */
:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f6f6f8;
  --color-text: #1a1a1f;
  --color-text-muted: #64656d;
  --color-border: #e4e4e9;
  --color-accent: #23305a;      /* deep indigo — single accent color */
  --color-accent-soft: #eceef4;
  --color-inverse-text: #ffffff;

  --font-base: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
    "Hiragino Sans", "Yu Gothic", "Segoe UI", Roboto, sans-serif;

  --max-width: 1200px;
  --gutter: 24px;

  --radius-sm: 3px;
  --radius-md: 6px;

  --header-height: 72px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================================
   Reset / base
   ========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, p, ul, ol, li, figure {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-inverse-text);
  padding: 12px 20px;
  z-index: 1000;
}

.skip-link:focus {
  left: var(--gutter);
  top: var(--gutter);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* =========================================================
   Typography helpers
   ========================================================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 48px;
  max-width: 26ch;
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 40px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), opacity 0.2s var(--ease);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-inverse-text);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-inverse {
  background-color: #ffffff;
  color: var(--color-accent);
}

.btn-inverse:hover {
  opacity: 0.85;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
}

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

.logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-list a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding-bottom: 4px;
}

.nav-list a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s var(--ease);
}

.nav-list a:not(.nav-cta):hover::after {
  transform: scaleX(1);
}

.nav-cta {
  padding: 10px 22px;
  background-color: var(--color-accent);
  color: var(--color-inverse-text);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: opacity 0.2s var(--ease);
}

.nav-cta:hover {
  opacity: 0.85;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  padding-top: calc(var(--header-height) + 140px);
  padding-bottom: 120px;
}

.hero-inner {
  max-width: 720px;
}

.hero-title {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 44px;
}

/* =========================================================
   Section base
   ========================================================= */
.section {
  padding-block: 100px;
}

.section-soft {
  background-color: var(--color-bg-soft);
}

/* =========================================================
   Service
   ========================================================= */
.service-list {
  border-top: 1px solid var(--color-border);
}

.service-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 32px;
  padding-block: 40px;
  border-bottom: 1px solid var(--color-border);
}

.service-number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.service-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-desc {
  color: var(--color-text-muted);
  max-width: 52ch;
}

/* =========================================================
   About
   ========================================================= */
.about-inner {
  max-width: 720px;
}

.about-lead {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.7;
  margin-bottom: 24px;
}

.about-text {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.95;
}

/* =========================================================
   Strength
   ========================================================= */
.strength-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.strength-number {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.strength-title {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.6;
}

.strength-desc {
  color: var(--color-text-muted);
  font-size: 0.94rem;
  line-height: 1.85;
}

/* =========================================================
   Price
   ========================================================= */
.price-list {
  border-top: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.price-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-block: 28px;
  border-bottom: 1px solid var(--color-border);
}

.price-name {
  font-size: 1rem;
  font-weight: 600;
}

.price-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-accent);
  white-space: nowrap;
}

.price-note {
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

/* =========================================================
   Flow
   ========================================================= */
.flow-list {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.flow-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  position: relative;
  padding-top: 28px;
  border-top: 2px solid var(--color-border);
}

.flow-number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
}

.flow-label {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.6;
}

/* =========================================================
   FAQ
   ========================================================= */
.faq-list {
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding-block: 24px;
}

.faq-question {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 1rem;
  font-weight: 600;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  flex-shrink: 0;
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.2s var(--ease);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.9;
  margin-top: 18px;
  max-width: 60ch;
}

/* =========================================================
   Contact
   ========================================================= */
.contact {
  background-color: var(--color-accent);
  color: var(--color-inverse-text);
  padding-block: 120px;
  text-align: center;
}

.contact-inner {
  max-width: 640px;
}

.contact-title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: -0.01em;
  margin-bottom: 44px;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  padding-block: 48px;
  text-align: center;
}

.footer-logo {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.footer-tagline {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 18px;
}

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

/* =========================================================
   Scroll reveal (light fade-in — progressive enhancement)
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   Responsive — tablet
   ========================================================= */
@media (max-width: 900px) {
  .strength-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* =========================================================
   Responsive — mobile
   ========================================================= */
@media (max-width: 760px) {
  :root {
    --gutter: 20px;
    --header-height: 64px;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    transform: translateX(100%);
    transition: transform 0.28s var(--ease);
    overflow-y: auto;
  }

  .nav.is-open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 32px var(--gutter) 40px;
  }

  .nav-list li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-list a {
    display: block;
    padding: 18px 0;
    font-size: 1rem;
  }

  .nav-list a:not(.nav-cta)::after {
    display: none;
  }

  .nav-cta {
    display: inline-block;
    margin-top: 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding-top: calc(var(--header-height) + 72px);
    padding-bottom: 80px;
  }

  .hero-desc {
    margin-bottom: 36px;
  }

  .btn {
    width: 100%;
    padding-block: 16px;
  }

  .section {
    padding-block: 72px;
  }

  .section-title {
    margin-bottom: 36px;
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-block: 32px;
  }

  .flow-list {
    flex-direction: column;
    gap: 28px;
  }

  .flow-item {
    padding-top: 0;
    padding-left: 24px;
    border-top: none;
    border-left: 2px solid var(--color-border);
  }

  .price-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .contact {
    padding-block: 88px;
  }
}