/* =============================================
   BUTTON SYSTEM — Tech / Computational Aesthetic
   All colors reference the CSS custom properties
   defined in base.html :root.
   ============================================= */

/* =============================================
   BASE
   ============================================= */
.btn-base {
  display: inline-block;
  font-family: var(--font-ui);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: 2px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  position: relative;
  white-space: nowrap;
}

.btn-base:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.3);
}

/* =============================================
     PRIMARY — Cyan-filled, for main CTAs
     ============================================= */
.btn-primary {
  background: linear-gradient(
    135deg,
    rgba(34, 211, 238, 0.2) 0%,
    rgba(34, 211, 238, 0.1) 100%
  );
  color: var(--accent-cyan);
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-family: var(--font-data);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid rgba(34, 211, 238, 0.4);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  background: linear-gradient(
    135deg,
    rgba(34, 211, 238, 0.3) 0%,
    rgba(34, 211, 238, 0.15) 100%
  );
  border-color: rgba(34, 211, 238, 0.6);
  box-shadow:
    0 0 20px rgba(34, 211, 238, 0.15),
    0 0 40px rgba(34, 211, 238, 0.05);
  color: #fff;
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Small variant */
.btn-primary-sm {
  background: linear-gradient(
    135deg,
    rgba(34, 211, 238, 0.2) 0%,
    rgba(34, 211, 238, 0.1) 100%
  );
  color: var(--accent-cyan);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-family: var(--font-data);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.btn-primary-sm:hover:not(:disabled) {
  transform: translateY(-1px);
  background: linear-gradient(
    135deg,
    rgba(34, 211, 238, 0.25) 0%,
    rgba(34, 211, 238, 0.12) 100%
  );
  border-color: rgba(34, 211, 238, 0.5);
  box-shadow: 0 0 15px rgba(34, 211, 238, 0.1);
  color: #fff;
}

.btn-primary-sm:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* =============================================
     SECONDARY — Outlined, for alternative actions
     ============================================= */
.btn-base.btn-secondary {
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 400;
  font-family: var(--font-data);
  color: var(--text-secondary);
  background: rgba(34, 211, 238, 0.03);
  border: 1px solid var(--border-tech);
  transition:
    color 0.2s ease,
    background 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}

.btn-base.btn-secondary:hover:not(:disabled) {
  color: var(--accent-cyan);
  background: rgba(34, 211, 238, 0.06);
  border-color: rgba(34, 211, 238, 0.3);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.08);
}

/* Small variant */
.btn-secondary-sm {
  color: var(--accent-cyan);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-family: var(--font-data);
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.btn-secondary-sm:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.1);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.1);
}

.btn-secondary-sm:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* =============================================
     TEXT — Minimal, inline actions
     ============================================= */
.btn-text {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  font-size: 0.875rem;
  font-family: var(--font-ui);
  font-weight: 500;
  transition: color 0.2s ease;
}

.btn-text:hover:not(:disabled) {
  color: var(--accent-cyan);
}

.btn-text:active:not(:disabled) {
  color: var(--text-primary);
}

.btn-text-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* =============================================
     DISABLED — All variants
     ============================================= */
.btn-primary:disabled,
.btn-primary-sm:disabled,
.btn-base.btn-secondary:disabled,
.btn-secondary-sm:disabled,
.btn-text:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  filter: none !important;
}

/* =============================================
     LOADING SPINNER
     ============================================= */
.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid var(--accent-cyan);
  border-radius: 50%;
  border-top-color: transparent;
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

/* =============================================
     MODIFIERS
     ============================================= */
.btn-full {
  width: 100%;
  display: block;
}

.btn-icon-left {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon-left svg {
  width: 1.25rem;
  height: 1.25rem;
}

.btn-icon-right {
  display: inline-flex;
  align-items: center;
  flex-direction: row-reverse;
  gap: 0.5rem;
}

.btn-icon-right svg {
  width: 1.25rem;
  height: 1.25rem;
}