/* ═══════════════════════════════════════════════
   DiagnosKit — Reset & Base
   ═══════════════════════════════════════════════ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-body);
}

input, textarea, select {
  font-family: var(--font-body);
}

ul, ol {
  list-style: none;
}

/* ── Utility Classes ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.text-blue  { color: var(--blue); }
.text-green { color: var(--green); }
.text-dark  { color: var(--gray-900); }
.text-muted { color: var(--gray-500); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  transform: translateY(-1px);
  box-shadow: 0 12px 36px rgba(58,171,219,0.38);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--white);
  color: var(--blue);
  border-color: var(--blue);
}
.btn-secondary:hover {
  background: var(--blue-light);
  transform: translateY(-1px);
}

.btn-green {
  background: var(--green);
  color: var(--white);
  border-color: var(--green);
  box-shadow: var(--shadow-green);
}
.btn-green:hover {
  background: var(--green-dark);
  border-color: var(--green-dark);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-700);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--gray-100);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

/* ── Form Elements ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  letter-spacing: 0.01em;
}

.form-label span {
  color: var(--status-error);
  margin-left: 2px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--gray-900);
  background: var(--white);
  transition: all var(--duration-fast) var(--ease-out);
  outline: none;
  appearance: none;
}

.form-input::placeholder {
  color: var(--gray-300);
}

.form-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(58,171,219,0.15);
}

.form-input.error {
  border-color: var(--status-error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.12);
}

.form-error {
  font-size: 13px;
  color: var(--status-error);
  display: flex;
  align-items: center;
  gap: 4px;
}

.form-hint {
  font-size: 13px;
  color: var(--gray-500);
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge-blue   { background: var(--blue-light); color: var(--blue-dark); }
.badge-green  { background: var(--green-light); color: var(--green-dark); }
.badge-orange { background: #FEF3C7; color: #92400E; }
.badge-gray   { background: var(--gray-100); color: var(--gray-500); }

/* ── Toast Notification ── */
.toast-container {
  position: fixed;
  top: calc(var(--header-h) + 16px);
  right: var(--space-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--gray-900);
  color: var(--white);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  pointer-events: all;
  animation: toastIn var(--duration-normal) var(--ease-out) forwards;
  max-width: 360px;
}

.toast.success { background: var(--green-dark); }
.toast.error   { background: #DC2626; }
.toast.info    { background: var(--blue-dark); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(24px); }
}

/* ── Loading Spinner ── */
.spinner {
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner-blue {
  border-color: rgba(58,171,219,0.2);
  border-top-color: var(--blue);
}

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

/* ── Modal Overlay ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26,35,50,0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.modal-overlay.active {
  opacity: 1;
}

.modal {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(24px) scale(0.97);
  transition: transform var(--duration-normal) var(--ease-out);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ── Skeleton Loading ── */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-300) 50%, var(--gray-100) 75%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0%   { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ── Lang switcher chip ── */
.lang-chip {
  display: inline-flex;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-full);
  overflow: hidden;
  font-size: 13px;
  font-weight: 600;
}

.lang-chip button {
  padding: 5px 12px;
  color: var(--gray-500);
  transition: all var(--duration-fast);
}

.lang-chip button.active {
  background: var(--blue);
  color: var(--white);
}

/* ── Divider ── */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--gray-300);
  font-size: 13px;
  font-weight: 500;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-300);
}

/* ── OAuth Button ── */
.btn-oauth {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  padding: 12px 20px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  background: var(--white);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
}

.btn-oauth:hover {
  border-color: var(--blue);
  background: var(--blue-light);
  color: var(--blue-dark);
}

.btn-oauth svg {
  flex-shrink: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
  .btn-lg    { padding: 13px 24px; font-size: 15px; }
}