/* ============================================================
   Academy UI Polish — buttons, frames, panels, forms, tables
   Loaded after platform-v2.css. Safe additive overrides only.
   ============================================================ */

:root {
  --btn-height: 42px;
  --btn-radius: 12px;
  --frame-radius: 16px;
  --frame-radius-lg: 22px;
  --control-radius: 12px;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --focus-ring: 0 0 0 3px color-mix(in srgb, var(--brand) 28%, transparent);
}

/* ---------- Buttons ---------- */
.button,
.primary-button,
.secondary-button,
.danger-button,
button.button,
a.button,
input[type="submit"].button,
.logout-button,
.icon-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--btn-height);
  padding: 0 16px;
  border-radius: var(--btn-radius);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.18s var(--ease-out),
    box-shadow 0.18s var(--ease-out),
    background 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease,
    opacity 0.15s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.button:active,
.primary-button:active,
.secondary-button:active,
.danger-button:active {
  transform: translateY(1px) scale(0.985);
}

.button:disabled,
.primary-button:disabled,
.secondary-button:disabled,
.danger-button:disabled,
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Primary */
.button-primary,
.primary-button,
button.button-primary,
a.button-primary {
  background: linear-gradient(135deg, var(--brand), color-mix(in srgb, var(--brand) 72%, #0ea5e9));
  color: #fff !important;
  border-color: color-mix(in srgb, var(--brand) 80%, #000);
  box-shadow:
    0 1px 0 color-mix(in srgb, #fff 22%, transparent) inset,
    0 8px 20px color-mix(in srgb, var(--brand) 28%, transparent);
}

.button-primary:hover,
.primary-button:hover,
button.button-primary:hover,
a.button-primary:hover {
  filter: brightness(1.05);
  box-shadow:
    0 1px 0 color-mix(in srgb, #fff 28%, transparent) inset,
    0 12px 28px color-mix(in srgb, var(--brand) 36%, transparent);
  transform: translateY(-1px);
}

/* Secondary / ghost */
.button-secondary,
.secondary-button,
button.button-secondary,
a.button-secondary {
  background: var(--surface);
  color: var(--ink) !important;
  border-color: var(--line-strong, var(--line));
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

.button-secondary:hover,
.secondary-button:hover {
  background: var(--surface-muted, var(--paper));
  border-color: color-mix(in srgb, var(--brand) 35%, var(--line));
  color: var(--brand) !important;
  transform: translateY(-1px);
}

/* Danger */
.button-danger,
.danger-button,
button.button-danger {
  background: linear-gradient(135deg, #e11d48, #be123c);
  color: #fff !important;
  border-color: #9f1239;
  box-shadow: 0 8px 18px rgba(225, 29, 72, 0.22);
}

.button-danger:hover,
.danger-button:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

/* Soft / muted action */
.button-soft,
.button-ghost {
  background: color-mix(in srgb, var(--brand) 8%, var(--surface));
  color: var(--brand) !important;
  border-color: color-mix(in srgb, var(--brand) 18%, transparent);
}

.button-soft:hover,
.button-ghost:hover {
  background: color-mix(in srgb, var(--brand) 14%, var(--surface));
}

/* Icon-only buttons */
.icon-button {
  width: 40px;
  min-width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  box-shadow: var(--shadow-sm, 0 1px 2px rgba(16, 24, 40, 0.04));
}

.icon-button:hover {
  background: var(--brand-soft, color-mix(in srgb, var(--brand) 10%, var(--surface)));
  color: var(--brand);
  border-color: color-mix(in srgb, var(--brand) 25%, var(--line));
  transform: translateY(-1px);
}

.logout-button {
  min-height: 40px;
  border-radius: 12px;
  background: color-mix(in srgb, #ef4444 8%, transparent);
  color: #e11d48;
  border: 1px solid color-mix(in srgb, #ef4444 18%, transparent);
  padding: 0 12px;
}

.logout-button:hover {
  background: color-mix(in srgb, #ef4444 14%, transparent);
  border-color: color-mix(in srgb, #ef4444 30%, transparent);
}

/* Focus */
.button:focus-visible,
.primary-button:focus-visible,
.secondary-button:focus-visible,
.danger-button:focus-visible,
.icon-button:focus-visible,
.logout-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring), 0 8px 20px color-mix(in srgb, var(--brand) 18%, transparent);
}

/* ---------- Frames / Panels / Cards ---------- */
.panel,
.stat-card,
.course-card,
.exercise-card,
.submission-card,
.resource-card,
.auth-card,
.table-wrap,
.viewer-shell,
.chat-info,
.chat-window,
.notice {
  border-radius: var(--frame-radius) !important;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 97%, transparent);
  box-shadow: var(--shadow-sm, 0 3px 15px rgba(36, 48, 82, 0.05));
  transition:
    border-color 0.2s ease,
    box-shadow 0.22s var(--ease-out),
    transform 0.22s var(--ease-out);
}

.panel:hover,
.stat-card:hover,
.course-card:hover,
.exercise-card:hover,
.resource-card:hover {
  border-color: color-mix(in srgb, var(--brand) 22%, var(--line));
  box-shadow: var(--shadow-md, 0 14px 36px rgba(43, 53, 91, 0.1));
}

.panel {
  padding: 22px 22px 20px;
}

.stat-card {
  padding: 18px 18px 16px;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--brand), var(--accent, #06b6d4));
  opacity: 0.85;
  border-radius: 3px 0 0 3px;
}

.course-card,
.exercise-card,
.resource-card {
  padding: 16px;
}

/* Section headers inside panels */
.panel > h2,
.panel > h3,
.panel-header,
.section-title {
  margin: 0 0 14px;
  letter-spacing: -0.03em;
}

/* ---------- Form controls ---------- */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="url"],
input[type="date"],
input[type="datetime-local"],
input[type="time"],
input[type="tel"],
select,
textarea {
  min-height: 42px;
  padding: 10px 14px;
  border-radius: var(--control-radius);
  border: 1px solid var(--line-strong, var(--line));
  background: var(--surface);
  color: var(--ink);
  transition:
    border-color 0.16s ease,
    box-shadow 0.16s ease,
    background 0.16s ease;
  width: 100%;
  max-width: 100%;
}

textarea {
  min-height: 96px;
  resize: vertical;
  line-height: 1.5;
}

input:hover,
select:hover,
textarea:hover {
  border-color: color-mix(in srgb, var(--brand) 30%, var(--line));
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--brand) 55%, var(--line));
  box-shadow: var(--focus-ring);
  background: var(--surface);
}

input::placeholder,
textarea::placeholder {
  color: var(--muted);
  opacity: 0.85;
}

label {
  display: block;
  font-weight: 600;
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.form-grid,
.stack-form {
  gap: 14px;
}

.form-grid label,
.stack-form label {
  margin-bottom: 0;
}

/* ---------- Tables ---------- */
.table-wrap {
  overflow: auto;
  padding: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface-muted, var(--paper));
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: start;
}

tbody td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr {
  transition: background 0.14s ease;
}

tbody tr:hover {
  background: color-mix(in srgb, var(--brand) 4%, transparent);
}

/* ---------- Notices / alerts ---------- */
.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  margin-bottom: 18px;
  font-weight: 600;
  font-size: 13.5px;
}

.notice-success {
  background: var(--success-bg, #ecfdf3);
  color: var(--success, #067647);
  border-color: color-mix(in srgb, var(--success, #067647) 22%, transparent);
}

.notice-error {
  background: var(--danger-bg, #fef3f2);
  color: var(--danger, #b42318);
  border-color: color-mix(in srgb, var(--danger, #b42318) 22%, transparent);
}

.notice-info {
  background: var(--info-bg, #eff8ff);
  color: var(--info, #175cd3);
  border-color: color-mix(in srgb, var(--info, #175cd3) 22%, transparent);
}

/* ---------- Badges / pills ---------- */
.status-pill,
.badge,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
}

/* ---------- Topbar polish ---------- */
.topbar {
  border-radius: 0 0 var(--frame-radius) var(--frame-radius);
}

/* ---------- Auth pages ---------- */
.auth-card {
  padding: 28px 26px;
  border-radius: var(--frame-radius-lg) !important;
  box-shadow: var(--shadow-md, 0 14px 36px rgba(43, 53, 91, 0.1));
}

.auth-card .button-primary,
.auth-card .primary-button {
  width: 100%;
  min-height: 46px;
  font-size: 15px;
}

/* ---------- Modal / dialog ---------- */
.confirm-modal {
  border: 1px solid var(--line);
  border-radius: var(--frame-radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg, 0 25px 70px rgba(43, 53, 91, 0.16));
  background: var(--surface);
  color: var(--ink);
  max-width: min(420px, 92vw);
}

.confirm-modal::backdrop {
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
}

.confirm-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 18px;
}

/* ---------- Empty states ---------- */
.empty-state {
  text-align: center;
  padding: 36px 20px;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: var(--frame-radius);
  background: color-mix(in srgb, var(--surface-muted, var(--paper)) 60%, transparent);
}

/* ---------- Chat compose polish ---------- */
.chat-compose {
  border-radius: 16px !important;
  border: 1px solid var(--line) !important;
  background: var(--surface) !important;
  box-shadow: 0 -4px 24px rgba(36, 48, 82, 0.04);
}

.chat-compose textarea {
  border: 0 !important;
  box-shadow: none !important;
  background: transparent !important;
  min-height: 44px !important;
}

.chat-compose .button-primary,
.chat-compose .primary-button {
  min-height: 40px;
  border-radius: 11px;
  padding-inline: 18px;
}

/* ---------- Action bar groups ---------- */
.actions,
.form-actions,
.toolbar-actions,
.panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ---------- Responsive touch targets ---------- */
@media (max-width: 720px) {
  .button,
  .primary-button,
  .secondary-button,
  .danger-button {
    min-height: 44px;
    padding-inline: 14px;
  }

  .icon-button {
    width: 44px;
    min-width: 44px;
    height: 44px;
  }

  .panel {
    padding: 16px;
  }

  thead th,
  tbody td {
    padding: 10px 12px;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .button,
  .primary-button,
  .secondary-button,
  .danger-button,
  .icon-button,
  .panel,
  .stat-card,
  .course-card,
  .exercise-card,
  .resource-card {
    transition: none !important;
  }

  .button:hover,
  .primary-button:hover,
  .secondary-button:hover,
  .danger-button:hover {
    transform: none !important;
  }
}

/* ---------- Dark theme tweaks ---------- */
:root[data-theme="dark"] .button-secondary,
:root[data-theme="dark"] .secondary-button {
  background: var(--surface-muted, var(--surface));
  border-color: var(--line-strong, var(--line));
}

:root[data-theme="dark"] .icon-button {
  background: var(--surface-muted, var(--surface));
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] select,
:root[data-theme="dark"] textarea {
  background: var(--surface-muted, var(--surface));
}

:root[data-theme="dark"] thead th {
  background: var(--surface-muted, var(--surface));
}

:root[data-theme="dark"] .stat-card::before {
  opacity: 1;
}