/* ==========================================================================
   Components — Buttons, Cards, Navigation, Forms
   ========================================================================== */

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding-block: var(--space-4);
  transition: background var(--duration-base) var(--ease-in-out),
              box-shadow var(--duration-base) var(--ease-in-out),
              padding var(--duration-base) var(--ease-in-out);
}

.nav--scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
  padding-block: var(--space-3);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
}

.nav__logo-text {
  font-family: var(--font-accent);
  font-size: var(--text-xl);
  font-weight: var(--font-extrabold);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav__logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
  letter-spacing: 0.08em;
}

.nav__links {
  display: none;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  transition: color var(--duration-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-secondary);
  transition: width var(--duration-base) var(--ease-out-expo);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__cta {
  display: none;
}

@media (min-width: 768px) {
  .nav__cta {
    display: block;
  }
}

/* ── Hamburger ── */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
  z-index: var(--z-overlay);
}

@media (min-width: 768px) {
  .nav__hamburger {
    display: none;
  }
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: transform var(--duration-base) var(--ease-in-out),
              opacity var(--duration-base);
}

.nav__hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Menu ── */
.nav__mobile {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,.98);
  backdrop-filter: blur(20px);
  z-index: calc(var(--z-overlay) - 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-in-out);
}

.nav__mobile.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  transition: color var(--duration-fast);
}

.nav__mobile-link:hover {
  color: var(--color-secondary);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast),
              background var(--duration-fast);
  white-space: nowrap;
  border: 2px solid transparent;
}

.btn:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 3px;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(26,58,110,.35);
}

.btn--accent {
  background: linear-gradient(135deg, var(--color-accent), #f5b832);
  color: var(--color-primary);
  box-shadow: var(--shadow-accent);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(240,165,0,.45);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn--outline-white {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,.6);
}

.btn--outline-white:hover {
  background: rgba(255,255,255,.15);
  border-color: #ffffff;
  transform: translateY(-2px);
}

.btn--line {
  background: #06c755;
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(6,199,85,.35);
}

.btn--line:hover {
  background: #05a648;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(6,199,85,.45);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn--xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-xl);
}

/* ── Cards ── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: transform var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--featured {
  border: 2px solid var(--color-secondary);
  position: relative;
  overflow: hidden;
}

.card--featured::before {
  content: 'おすすめ';
  position: absolute;
  top: 16px;
  right: -20px;
  background: var(--color-secondary);
  color: #ffffff;
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  padding: 4px 28px;
  transform: rotate(45deg);
  transform-origin: center;
  right: -8px;
  top: 12px;
}

/* ── Badge ── */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  letter-spacing: 0.05em;
}

.badge--primary {
  background: rgba(26,58,110,.1);
  color: var(--color-primary);
}

.badge--secondary {
  background: rgba(46,170,220,.1);
  color: var(--color-secondary);
}

.badge--accent {
  background: rgba(240,165,0,.15);
  color: var(--color-accent-dark);
}

.badge--success {
  background: rgba(39,174,96,.1);
  color: var(--color-success);
}

/* ── Form Elements ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.form-label .required {
  color: #e53e3e;
  margin-left: var(--space-1);
}

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--duration-fast),
              box-shadow var(--duration-fast);
  outline: none;
}

.form-control:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(46,170,220,.15);
}

.form-control::placeholder {
  color: var(--color-muted);
}

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

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%234a5568' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-10);
}

/* ── Tags ── */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-muted);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ── Icon Box ── */
.icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  flex-shrink: 0;
}

.icon-box--secondary {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
}

.icon-box--accent {
  background: linear-gradient(135deg, var(--color-accent), #f5b832);
}

.icon-box svg {
  width: 28px;
  height: 28px;
  color: #ffffff;
}

/* ── Number Stat ── */
.stat {
  text-align: center;
}

.stat__number {
  font-family: var(--font-accent);
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  font-weight: var(--font-extrabold);
  color: var(--color-primary);
  line-height: 1;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-1);
}

.stat__number--white {
  color: #ffffff;
}

.stat__unit {
  font-size: var(--text-2xl);
}

.stat__label {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
  font-weight: var(--font-medium);
}

.stat__label--white {
  color: rgba(255,255,255,.8);
}

/* ── Step Item ── */
.step {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #ffffff;
  font-family: var(--font-accent);
  font-weight: var(--font-extrabold);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.step__content {
  flex: 1;
  padding-top: var(--space-2);
}

.step__title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.step__desc {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ── Footer ── */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,.8);
  padding-block: var(--space-16) var(--space-8);
}

.footer__inner {
  display: grid;
  gap: var(--space-12);
}

@media (min-width: 768px) {
  .footer__inner {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--space-16);
  }
}

.footer__logo-text {
  font-family: var(--font-accent);
  font-size: var(--text-xl);
  font-weight: var(--font-extrabold);
  color: #ffffff;
  margin-bottom: var(--space-2);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: rgba(255,255,255,.5);
  margin-bottom: var(--space-6);
}

.footer__nav-title {
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: rgba(255,255,255,.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer__nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__nav-link {
  font-size: var(--text-sm);
  color: rgba(255,255,255,.7);
  transition: color var(--duration-fast);
}

.footer__nav-link:hover {
  color: var(--color-secondary);
}

.footer__bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  font-size: var(--text-sm);
  color: rgba(255,255,255,.4);
}

/* ── Floating CTA ── */
.floating-cta {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: var(--z-sticky);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity var(--duration-base), transform var(--duration-base) var(--ease-out-expo);
}

.floating-cta.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}