/* ─── Academy Base Styles ───
 * Reset, typography, global utilities, animations
 */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

html, body {
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: var(--font-base);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ── Desktop font upgrade ── */
@media (min-width: 768px) {
  html, body {
    font-family: "Manrope", "PingFang SC", "Microsoft YaHei", sans-serif;
  }
}

/* ── Links ── */
a { color: inherit; text-decoration: none; }

/* ── Images ── */
img, svg { display: block; max-width: 100%; }

/* ── Lists ── */
ul, ol { list-style: none; }

/* ── Inputs ── */
button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button { cursor: pointer; }

/* ── Scrollbar (desktop) ── */
@media (min-width: 768px) {
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb {
    background: rgba(165,175,191,0.2);
    border-radius: 3px;
  }
  ::-webkit-scrollbar-thumb:hover { background: rgba(165,175,191,0.35); }
}

/* ── Selection ── */
::selection {
  background: rgba(201,169,98,0.3);
  color: var(--text-primary);
}

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--brand-gold);
  outline-offset: 2px;
  border-radius: var(--radius-btn);
}

/* ── Utility Classes ── */
.hidden { display: none !important; }
.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;
}

/* ── Page Transition ── */
.page-enter {
  animation: page-fade-in var(--transition-slow) ease-out;
}

@keyframes page-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Directional Page Transitions ── */
.page-slide-right {
  animation: slide-from-right var(--transition-slow) ease-out;
}
.page-slide-left {
  animation: slide-from-left var(--transition-slow) ease-out;
}

@keyframes slide-from-right {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes slide-from-left {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Skeleton Loading ── */
.skeleton {
  background: linear-gradient(90deg,
    var(--bg-panel) 25%,
    var(--bg-elevated) 50%,
    var(--bg-panel) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-btn);
}

@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line {
  height: 14px;
  margin-bottom: var(--space-sm);
  border-radius: 4px;
}

.skeleton-line:last-child { margin-bottom: 0; }
.skeleton-line.w-75 { width: 75%; }
.skeleton-line.w-50 { width: 50%; }
.skeleton-line.w-60 { width: 60%; }
.skeleton-title {
  height: 20px;
  width: 40%;
  margin-bottom: var(--space-md);
  border-radius: 4px;
}

.skeleton-circle {
  border-radius: 50%;
}

.skeleton-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
}

/* ── Spinner (fallback) ── */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--brand-gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 60px auto;
}

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

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: calc(var(--tabbar-h) + 24px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  padding: 10px 24px;
  font-size: var(--font-sm);
  color: var(--text-primary);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-slow);
  z-index: var(--z-toast);
  box-shadow: var(--shadow-lg);
  max-width: calc(100vw - 48px);
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Modal ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: var(--z-modal);
  animation: modal-bg-in var(--transition-base) ease-out;
}

@keyframes modal-bg-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-box {
  background: var(--bg-panel);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  padding: var(--space-2xl);
  max-width: 340px;
  width: calc(100% - 48px);
  box-shadow: var(--shadow-xl);
  animation: modal-slide-in var(--transition-slow) ease-out;
}

@keyframes modal-slide-in {
  from { opacity: 0; transform: translateY(16px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-title {
  font-size: var(--font-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
}

.modal-body {
  font-size: var(--font-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: var(--line-height-relaxed);
}

.modal-actions {
  display: flex;
  gap: var(--space-md);
}

.modal-actions .btn { flex: 1; }

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 48px var(--space-lg);
  color: var(--text-muted);
  font-size: var(--font-base);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-lg);
  opacity: 0.6;
}

.empty-state-text {
  font-size: var(--font-sm);
  color: var(--text-muted);
  margin-top: var(--space-xs);
  line-height: var(--line-height-relaxed);
}

/* ── Alert ── */
.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-btn);
  font-size: var(--font-sm);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-normal);
}

.alert-danger {
  background: var(--bg-danger);
  color: var(--color-danger);
  border: 1px solid rgba(248,113,113,0.3);
}

.alert-success {
  background: var(--bg-success);
  color: var(--color-success);
  border: 1px solid rgba(74,222,128,0.3);
}

.alert-warning {
  background: var(--bg-warning);
  color: var(--color-warning);
  border: 1px solid rgba(251,146,60,0.3);
}

/* ── Font Toggle ── */
.font-toggle {
  position: fixed;
  bottom: calc(var(--tabbar-h) + 16px + env(safe-area-inset-bottom, 0px));
  left: 16px;
  width: var(--touch-target);
  height: var(--touch-target);
  background: var(--bg-panel);
  border: 1px solid var(--border-default);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  cursor: pointer;
  z-index: 90; /* below tabbar z-index to not overlap */
  color: var(--text-secondary);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.font-toggle:active { background: var(--gold-glow); }

@media (min-width: 768px) {
  .font-toggle { bottom: 16px; left: 16px; }
}