/* ============================================================
   SLNext Academy — Components
   Header, navigation, buttons, cards, forms, footer
   ============================================================ */

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 15px 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
    border-color 0.3s var(--ease), transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
  will-change: transform;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--ink);
  color: var(--light);
  box-shadow: 0 14px 34px -18px rgba(27, 24, 19, 0.55);
}

.btn--primary:hover {
  background: var(--accent-strong);
  box-shadow: 0 18px 40px -18px rgba(133, 103, 47, 0.55);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--ink);
  background: rgba(27, 24, 19, 0.05);
}

.btn--light {
  background: var(--light);
  color: var(--ink);
  box-shadow: 0 16px 40px -20px rgba(0, 0, 0, 0.6);
}

.btn--light:hover {
  background: var(--accent);
  color: var(--light);
}

.btn--ghost-invert {
  background: transparent;
  color: var(--light);
  border-color: var(--line-dark);
}

.btn--ghost-invert:hover {
  border-color: var(--light);
  background: rgba(246, 242, 235, 0.06);
}

.btn--sm { padding: 11px 20px; font-size: 0.9rem; }

.btn--lg { padding: 18px 34px; font-size: 1.05rem; }

.btn--full { width: 100%; }

/* ---------- Small components ---------- */

.icon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--accent-strong);
  box-shadow: var(--shadow-sm);
}

.icon-badge svg {
  width: 24px;
  height: 24px;
}

.chip {
  display: inline-block;
  padding: 5px 13px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--ink-2);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-weight: 600;
  font-size: 0.95rem;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.text-link > span {
  transition: transform 0.3s var(--ease);
}

.text-link:hover {
  color: var(--accent-strong);
  border-color: var(--accent);
}

.text-link:hover > span {
  transform: translateX(4px);
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(246, 242, 235, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 34px -26px rgba(27, 24, 19, 0.35);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-h);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--ink);
}

.logo__mark {
  width: 34px;
  height: 34px;
}

.logo__word {
  font-family: var(--font-serif);
  font-size: 1.42rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1;
}

.logo__academy {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-strong);
  margin-left: -6px;
  align-self: flex-end;
  padding-bottom: 2px;
}

.primary-nav {
  margin-left: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 30px);
}

.nav-link {
  position: relative;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink-2);
  padding-block: 6px;
  transition: color 0.25s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent-strong);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav-link:hover {
  color: var(--ink);
}

.nav-link:hover::after,
.nav-link.is-active {
  transform: scaleX(1);
  color: var(--accent-strong);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: clamp(12px, 2vw, 28px);
}

.nav-cta { display: none; }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.nav-toggle:hover {
  border-color: var(--ink);
}

.nav-toggle__bar {
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
}

.lang-switch__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.lang-switch__btn:hover {
  color: var(--ink);
}

.lang-switch__btn.is-active {
  background: var(--ink);
  color: var(--light);
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
  color: var(--light);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1.1fr 1.2fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-block: clamp(56px, 8vw, 90px);
  border-bottom: 1px solid var(--line-dark);
}

.logo--footer {
  color: var(--light);
  margin-bottom: 1.4rem;
}

.logo--footer .logo__academy { color: var(--accent); }

.footer__desc {
  color: rgba(246, 242, 235, 0.7);
  font-size: 0.95rem;
  max-width: 34ch;
  line-height: 1.7;
}

.social {
  display: flex;
  gap: 12px;
  margin-top: 1.6rem;
}

.social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line-dark);
  color: var(--light);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease),
    transform 0.3s var(--ease);
}

.social a:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.social svg {
  width: 18px;
  height: 18px;
}

.footer__col h3 {
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1.4rem;
}

.footer__col ul {
  display: grid;
  gap: 0.75rem;
}

.footer__col a {
  color: rgba(246, 242, 235, 0.72);
  font-size: 0.94rem;
  transition: color 0.25s var(--ease);
}

.footer__col a:hover {
  color: var(--light);
}

.footer__contact {
  font-style: normal;
  color: rgba(246, 242, 235, 0.72);
  font-size: 0.94rem;
  display: grid;
  gap: 0.75rem;
}

.footer__contact a:hover {
  color: var(--light);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-block: 26px;
  font-size: 0.85rem;
  color: rgba(246, 242, 235, 0.55);
}

.footer__legal {
  display: flex;
  gap: 1.6rem;
}

.footer__legal a {
  color: inherit;
  transition: color 0.25s var(--ease);
}

.footer__legal a:hover {
  color: var(--light);
}

/* ---------- Forms ---------- */

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.field label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-2);
}

.field label span { color: var(--accent-strong); }

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field select,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

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

.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='8' viewBox='0 0 14 8'%3E%3Cpath d='M1 1l6 6 6-6' fill='none' stroke='%231B1813' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

.field input::placeholder,
.field textarea::placeholder {
  color: rgba(111, 103, 91, 0.75);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(160, 128, 74, 0.2);
}

.field input:user-invalid,
.field select:user-invalid,
.field textarea:user-invalid,
.field input.is-invalid,
.field select.is-invalid,
.field textarea.is-invalid {
  border-color: #B4554D;
  box-shadow: 0 0 0 3px rgba(180, 85, 77, 0.15);
}

.field--consent {
  flex-direction: row;
  align-items: flex-start;
  gap: 12px;
}

.field--consent input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex-shrink: 0;
  accent-color: var(--accent-strong);
}

.field--consent label {
  font-weight: 400;
  font-size: 0.88rem;
  color: var(--muted);
}

.field--consent label a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.field--consent label a:hover {
  color: var(--ink);
}

.form-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 12px;
}

.form-success {
  margin-top: 16px;
  padding: 15px 18px;
  border-radius: var(--radius-s);
  background: #EFE6D4;
  border: 1px solid rgba(160, 128, 74, 0.4);
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.95rem;
}