/* ==========================================================================
   Synvoca — Components
   ========================================================================== */

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: var(--ls-normal);
  border: 1px solid transparent;
  transition: background-color var(--duration-base) var(--ease),
    background-position var(--duration-slow) var(--ease), box-shadow var(--duration-base) var(--ease),
    color var(--duration-base) var(--ease), border-color var(--duration-base) var(--ease),
    transform var(--duration-fast) var(--ease);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.link-accent {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--duration-fast) var(--ease);
}

.link-accent:hover {
  text-decoration-color: currentColor;
}

.btn--primary {
  background: var(--gradient-brand);
  background-size: 160% 160%;
  background-position: 0% 50%;
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(34, 211, 238, 0.25);
}

.btn--primary:hover {
  background-position: 100% 50%;
  box-shadow: 0 6px 28px rgba(34, 211, 238, 0.4);
}

.btn--secondary {
  background: transparent;
  color: var(--color-fg);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-fg);
}

.section--inverse .btn--secondary {
  color: var(--color-inverse-fg);
  border-color: var(--color-inverse-border);
}

.section--inverse .btn--secondary:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--color-inverse-fg-secondary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-fg-secondary);
  padding: 0.5rem 0.25rem;
}

.btn--ghost:hover {
  color: var(--color-fg);
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: var(--fs-body);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 6, 12, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.site-header__logo img {
  height: 26px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav__list a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-fg-secondary);
  transition: color var(--duration-fast) var(--ease);
}

.site-nav__list a:hover {
  color: var(--color-fg);
}

.site-nav__cta-item {
  display: none;
}

.site-nav__list .site-nav__cta-item a {
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: none;
  padding: 0.875rem 1.75rem;
  background: var(--gradient-brand);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.site-nav__list .site-nav__cta-item a:hover {
  filter: brightness(1.1);
  color: #ffffff;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-header__login {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-fg-secondary);
  transition: color var(--duration-fast) var(--ease);
}

.site-header__login:hover {
  color: var(--color-fg);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: var(--ls-normal);
}

.lang-switch__item {
  color: var(--color-fg-muted);
  transition: color var(--duration-fast) var(--ease);
}

.lang-switch__item:hover {
  color: var(--color-fg);
}

.lang-switch__item--active {
  color: var(--color-fg);
}

.lang-switch__sep {
  color: var(--color-border-strong);
}

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

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-fg);
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 860px) {
  .site-nav__list {
    position: fixed;
    top: 65px;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 95;
    width: 100%;
    height: calc(100vh - 65px);
    height: calc(100dvh - 65px);
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    padding: var(--space-5) var(--container-padding-x);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
  }

  .site-nav__list a {
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--fs-body);
    color: var(--color-fg);
  }

  .site-nav.is-open .site-nav__list {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav.is-open .site-header__login,
  .site-header__login {
    display: none;
  }

  .site-header__actions .btn--lg {
    display: none;
  }

  .site-nav__list .site-nav__cta-item {
    display: block;
    margin-top: var(--space-5);
  }

  .nav-toggle {
    display: flex;
  }
}

@media (min-width: 861px) {
  .site-header__actions .cta-demo--mobile {
    display: none;
  }
}

/* ---- Cards --------------------------------------------------------------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--duration-base) var(--ease), transform var(--duration-base) var(--ease),
    box-shadow var(--duration-base) var(--ease);
}

.card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  flex-shrink: 0;
}

.card__icon svg {
  width: 20px;
  height: 20px;
}

.card h3,
.card h4 {
  margin-bottom: var(--space-2);
}

.card p {
  color: var(--color-fg-secondary);
  font-size: var(--fs-small);
}

/* ---- Grids ----------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--space-5);
}

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

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

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

@media (max-width: 960px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* ---- Steps (Πώς λειτουργεί) ------------------------------------------------ */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-7);
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: var(--space-7);
  border-top: 1px solid var(--color-border);
}

.step__number {
  position: absolute;
  top: -0.05em;
  left: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-fg-muted);
}

.step h3 {
  margin-bottom: var(--space-3);
}

.step p {
  color: var(--color-fg-secondary);
}

.step__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-fg);
}

@media (max-width: 780px) {
  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* ---- Problem list ----------------------------------------------------------- */

.problem-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3) var(--space-6);
}

.problem-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.problem-item__mark {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--color-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.problem-item__mark::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-fg-secondary);
}

.problem-item p {
  margin: 0;
  font-size: var(--fs-body);
}

@media (max-width: 780px) {
  .problem-list {
    grid-template-columns: 1fr;
  }
}

/* ---- Industry cards ---------------------------------------------------------- */

.industry-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
}

.industry-card:hover {
  border-color: var(--color-fg);
  transform: translateY(-2px);
}

.industry-card__label {
  font-size: var(--fs-body);
  font-weight: 600;
}

.industry-card__desc {
  margin-top: var(--space-2);
  font-size: 0.9375rem;
  color: var(--color-fg-secondary);
}

/* ---- FAQ ---------------------------------------------------------------------- */

.faq-list {
  max-width: 760px;
  margin-inline: auto;
  border-top: 1px solid var(--color-border);
}

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

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  text-align: left;
  font-size: var(--fs-body-lg);
  font-weight: 500;
}

.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--color-fg);
  top: 50%;
  left: 50%;
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) var(--ease);
}

.faq-item__icon::before {
  width: 12px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.faq-item__icon::after {
  width: 1.5px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.faq-item__question[aria-expanded="true"] .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-item__answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--duration-base) var(--ease);
}

.faq-item__answer p {
  padding-bottom: var(--space-6);
  color: var(--color-fg-secondary);
  max-width: 620px;
}

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

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-field--full {
  grid-column: 1 / -1;
}

.form-field label {
  font-size: 0.9375rem;
  font-weight: 500;
}

.form-field label .optional {
  color: var(--color-fg-muted);
  font-weight: 400;
}

.form-field input,
.form-field select,
.form-field textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  font-size: var(--fs-small);
  transition: border-color var(--duration-fast) var(--ease);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--color-fg);
}

.form-field input:invalid[data-touched="true"],
.form-field textarea:invalid[data-touched="true"] {
  border-color: #f87171;
}

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

.form-note {
  font-size: 0.8125rem;
  color: var(--color-fg-muted);
}

.form-status {
  margin-top: var(--space-5);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: var(--fs-small);
  display: none;
}

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

.form-status--success {
  border-color: rgba(74, 222, 128, 0.3);
  background: rgba(74, 222, 128, 0.1);
  color: #86efac;
}

.form-status--error {
  border-color: rgba(248, 113, 113, 0.3);
  background: rgba(248, 113, 113, 0.1);
  color: #fca5a5;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8) var(--space-6);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-7);
  padding-bottom: var(--space-8);
}

.site-footer__brand img {
  height: 22px;
  width: auto;
  margin-bottom: var(--space-4);
}

.site-footer__brand p {
  color: var(--color-fg-secondary);
  font-size: var(--fs-small);
  max-width: 320px;
}

.site-footer__col h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-fg-muted);
  margin-bottom: var(--space-4);
}

.site-footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-footer__col a {
  font-size: var(--fs-small);
  color: var(--color-fg-secondary);
  transition: color var(--duration-fast) var(--ease);
}

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

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-fg-muted);
}

@media (max-width: 780px) {
  .site-footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
}

/* ---- Sticky mobile CTA -------------------------------------------------------------- */

.mobile-cta-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  padding: var(--space-4);
  background: rgba(5, 6, 12, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 640px) {
  .mobile-cta-bar {
    display: block;
  }
  body {
    padding-bottom: 76px;
  }
}