/* ==========================================================================
   Components
   Reusable UI elements — buttons, cards, badges, forms, navigation.
   ========================================================================== */

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75em 1.75em;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 12px hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.35);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 6px 24px hsla(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l), 0.5);
  transform: translateY(-2px) scale(1.02);
}

.btn--secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: var(--border-width) solid var(--border-color-strong);
}

.btn--secondary:hover {
  background: var(--surface-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5em 1em;
}

.btn--ghost:hover {
  color: var(--color-primary);
  background: var(--color-primary-muted);
}

.btn--sm {
  padding: 0.5em 1.25em;
  font-size: var(--text-xs);
}

.btn--lg {
  padding: 1em 2.25em;
  font-size: var(--text-base);
}

.btn__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}


/* --- Card --------------------------------------------------------------- */

.card {
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  border-color: var(--border-color-strong);
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px) scale(1.01);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-bottom: var(--border-width) solid var(--border-color);
}

.card__body {
  padding: var(--space-6);
}

.card__category {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-2);
}

.card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.card__description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--border-color);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  transition: gap var(--duration-fast) var(--ease-out);
}

.card__link:hover {
  gap: var(--space-3);
}

.card__link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.card__link:hover svg {
  transform: translateX(2px);
}


/* --- Badge -------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.3em 0.8em;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.badge:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-muted);
  transform: translateY(-2px);
}

.badge--primary {
  background: var(--color-primary-muted);
  border-color: transparent;
  color: var(--color-primary);
}

.badge--accent {
  background: var(--color-accent-muted);
  border-color: transparent;
  color: var(--color-accent);
}

.badge__icon {
  width: 14px;
  height: 14px;
}


/* --- Form Elements ------------------------------------------------------ */

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

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75em 1em;
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.form-input:hover,
.form-textarea:hover {
  border-color: var(--border-color-strong);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-muted);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
}

/* Honeypot — visually hidden but traps bots */
.form-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
  pointer-events: none;
}


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

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-sticky);
  transition: all var(--duration-normal) var(--ease-in-out);
}

.nav--scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: var(--border-width) solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

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

.nav__logo {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  flex-shrink: 0;
}

.nav__logo span {
  color: var(--color-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  position: relative;
  padding: 0.5em 1em;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

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

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

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}


/* --- Theme Toggle ------------------------------------------------------- */

.theme-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--surface);
  border: var(--border-width) solid var(--border-color);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--border-color-strong);
}

.theme-toggle__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  transition: transform var(--duration-normal) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="light"] .theme-toggle__thumb {
  transform: translateX(20px);
}

.theme-toggle__icon {
  width: 12px;
  height: 12px;
  fill: #fff;
}


/* --- Mobile Menu Toggle ------------------------------------------------- */

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-out);
}

.nav__hamburger:hover {
  background: var(--surface-hover);
}

.nav__hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-out);
  transform-origin: center;
}

.nav__hamburger--open span:nth-child(1) {
  transform: rotate(45deg) translate(2.5px, 2.5px);
}

.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger--open span:nth-child(3) {
  transform: rotate(-45deg) translate(2.5px, -2.5px);
}

@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-8) var(--space-6);
    gap: var(--space-2);
    background: var(--bg-primary);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: var(--z-overlay);
  }

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

  .nav__link {
    font-size: var(--text-lg);
    padding: var(--space-3) var(--space-4);
    width: 100%;
    border-radius: var(--radius-lg);
  }
}


/* --- Scroll Reveal Animation Base --------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(30px) scale(0.95);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }
.reveal--delay-3 { transition-delay: 300ms; }
.reveal--delay-4 { transition-delay: 400ms; }
.reveal--delay-5 { transition-delay: 500ms; }


/* --- Toast / Notification ----------------------------------------------- */

.toast {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--surface-elevated);
  border: var(--border-width) solid var(--border-color);
  backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-xl);
  z-index: var(--z-toast);
  transform: translateY(120%);
  opacity: 0;
  transition: all var(--duration-normal) var(--ease-out);
}

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

.toast--success {
  border-color: var(--color-success);
}

.toast--error {
  border-color: var(--color-danger);
}

.toast__message {
  font-size: var(--text-sm);
  font-weight: 500;
}