/* =============================================================
   Kurashiru AI Supply Chain OS — Component Kit
   Buttons, Inputs, Cards, Badges, Links, Sections
   ============================================================= */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: var(--fw-semibold);
  font-size: var(--ts-body-md);
  line-height: 1;
  padding: 14px 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover { transform: translateY(-0.5px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 9px 14px; font-size: var(--ts-body-sm); border-radius: var(--radius-sm); }
.btn-lg { padding: 18px 28px; font-size: var(--ts-body-lg); }

.btn-primary {
  background: var(--color-brand-primary);
  color: var(--color-text-on-brand);
}
.btn-primary:hover { background: var(--color-brand-primary-hover); text-decoration: none; }
.btn-primary:active { background: var(--color-brand-primary-active); }

.btn-secondary {
  background: var(--color-neutral-0);
  color: var(--color-text-primary);
  border-color: var(--color-border-default);
}
.btn-secondary:hover { background: var(--color-neutral-25); border-color: var(--color-border-strong); text-decoration: none; }

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
}
.btn-ghost:hover { background: var(--color-neutral-50); text-decoration: none; }

.btn-on-brand {
  background: var(--color-neutral-0);
  color: var(--color-brand-primary);
}
.btn-on-brand:hover { background: var(--color-bg-warm); text-decoration: none; }

/* ---------- Input ---------- */
.input {
  display: block; width: 100%;
  font-family: var(--font-body);
  font-size: var(--ts-body-md);
  line-height: var(--lh-tight);
  padding: 12px 14px;
  background: var(--color-neutral-0);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}
.input::placeholder { color: var(--color-text-tertiary); }
.input:hover { border-color: var(--color-border-strong); }
.input:focus { outline: none; border-color: var(--color-brand-primary); box-shadow: var(--shadow-focus); }

.label { display: block; font-size: var(--ts-body-sm); font-weight: var(--fw-medium); color: var(--color-text-secondary); margin-bottom: 6px; }

/* ---------- Card ---------- */
.card {
  background: var(--color-neutral-0);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);
}
.card-hover:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--color-border-default); }

/* ---------- Badge ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: var(--ts-body-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  line-height: 1.4;
}
.badge-brand   { background: var(--color-brand-primary-soft); color: var(--color-brand-primary-active); }
.badge-neutral { background: var(--color-neutral-50); color: var(--color-text-secondary); }
.badge-success { background: var(--color-success-bg); color: #1B7A2A; }
.badge-warning { background: var(--color-warning-bg); color: #6B4F00; }
.badge-info    { background: var(--color-info-bg); color: #2A4FCC; }

/* ---------- Link ---------- */
.link-inline { color: var(--color-text-link); font-weight: var(--fw-medium); }
.link-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--color-text-link); font-weight: var(--fw-semibold); font-size: var(--ts-body-md);
}
.link-arrow:hover { text-decoration: none; }
.link-arrow .arrow { transition: transform var(--duration-fast) var(--ease-out); }
.link-arrow:hover .arrow { transform: translateX(3px); }

/* ---------- Section ---------- */
.section { padding: var(--space-9) 0; }
.section-lg { padding: var(--space-11) 0; }
.section-warm { background: var(--color-bg-warm); }
.section-subtle { background: var(--color-bg-subtle); }
.section-inverse { background: var(--color-bg-inverse); color: var(--color-text-on-inverse); }

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

@media (min-width: 768px) { .container, .container-wide, .container-narrow { padding: 0 48px; } }
@media (min-width: 1024px) { .container, .container-wide { padding: 0 80px; } }

/* ---------- Eyebrow ---------- */
.eyebrow {
  display: inline-block;
  font-size: var(--ts-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-brand-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

/* ---------- Top Nav ---------- */
.topnav {
  position: sticky; top: 0; z-index: 50;
  height: var(--topnav-height);
  background: var(--color-neutral-0);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background var(--duration-base) var(--ease-out), backdrop-filter var(--duration-base) var(--ease-out);
}
.topnav.is-scrolled { background: rgba(255,255,255,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.topnav-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px;
}
.topnav-logo {
  display: inline-flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--color-text-primary);
  height: 100%;
}
.topnav-logo:hover { text-decoration: none; }
.topnav-logo-mark { display: block; height: 32px; width: auto; }
.topnav-logo-divider {
  display: block; width: 1px; height: 22px;
  background: var(--color-border-default, #D0D0D0);
}
.topnav-logo-suite {
  font: var(--fw-medium) 15px/1 var(--font-display);
  letter-spacing: -0.005em;
  color: var(--color-text-primary);
  white-space: nowrap;
}
.topnav-logo-suite-em { font-weight: var(--fw-bold); }
@media (max-width: 720px) {
  .topnav-logo-suite { font-size: 13px; }
  .topnav-logo-mark { height: 28px; }
}
.topnav-links {
  display: flex; gap: 32px; align-items: center;
  list-style: none; margin: 0; padding: 0;
}
.topnav-link {
  font-size: var(--ts-body-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  display: inline-flex; align-items: center; gap: 4px;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out);
}
.topnav-link:hover { color: var(--color-text-primary); text-decoration: none; }
.topnav-actions { display: flex; gap: 12px; align-items: center; }

/* ---------- App Header Logo Lockup ----------
   Used in product / service-site application headers.
   Composition: vertical Kurashiru brand mark + 1px divider + service name.
   Service name is interchangeable per sub-product.
   Override --app-header-service to swap the suite/sub-product label.
*/
.app-header-logo {
  display: inline-flex; align-items: center; gap: 14px;
  text-decoration: none; color: var(--color-text-primary);
  height: 100%;
  --app-header-mark-size: 36px;
  --app-header-divider-color: var(--color-border-default, #D0D0D0);
  --app-header-service-color: var(--color-text-primary);
  --app-header-service-size: 18px;
  --app-header-service-weight: var(--fw-bold);
}
.app-header-logo:hover { text-decoration: none; }
.app-header-logo-mark {
  display: block;
  height: var(--app-header-mark-size);
  width: auto;
}
.app-header-logo-divider {
  display: block; width: 1px;
  height: calc(var(--app-header-mark-size) * 0.7);
  background: var(--app-header-divider-color);
}
.app-header-logo-service {
  font: var(--app-header-service-weight) var(--app-header-service-size)/1.2 var(--font-display);
  letter-spacing: -0.005em;
  color: var(--app-header-service-color);
  white-space: nowrap;
}
/* Inverted variant — for dark / Spicy Red app-header surfaces */
.app-header-logo.is-inverted {
  --app-header-divider-color: rgba(255,255,255,.55);
  --app-header-service-color: #FFFFFF;
}
@media (max-width: 720px) {
  .app-header-logo {
    --app-header-mark-size: 32px;
    --app-header-service-size: 15px;
  }
}

/* ---------- Footer ---------- */
.footer { background: #1A1A1A; color: var(--color-neutral-200); padding: var(--space-9) 0 var(--space-7); }
.footer h4 { color: var(--color-neutral-0); font-size: var(--ts-body-sm); font-weight: var(--fw-semibold); margin-bottom: 18px; letter-spacing: 0.04em; text-transform: uppercase; }
.footer a { color: var(--color-neutral-300); display: block; padding: 6px 0; font-size: var(--ts-body-sm); }
.footer a:hover { color: var(--color-neutral-0); text-decoration: none; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px; }
.footer-brand img { height: 28px; margin-bottom: 16px; }
.footer-bottom {
  margin-top: var(--space-7); padding-top: 24px;
  border-top: 1px solid #2A2A2A;
  display: flex; justify-content: space-between; align-items: center;
  font-size: var(--ts-body-xs); color: var(--color-neutral-400);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; }
}

/* ---------- Scroll-in animation ---------- */
.scroll-in { opacity: 0; transform: translateY(24px); transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out); }
.scroll-in.is-in { opacity: 1; transform: translateY(0); }

/* ---------- Utility ---------- */
.flex { display: flex; }
.grid { display: grid; }
.gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; } .gap-5 { gap: 24px; } .gap-6 { gap: 32px; } .gap-7 { gap: 48px; }
.mt-2 { margin-top: 8px; } .mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; } .mt-5 { margin-top: 24px; } .mt-6 { margin-top: 32px; } .mt-7 { margin-top: 48px; }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary  { color: var(--color-text-tertiary); }
.text-brand     { color: var(--color-brand-primary); }