/* ========================================================
   EDYAIRDEV — CURSO DE SQL INTERACTIVO
   APPLE STUDIO DESIGN SYSTEM
   ======================================================== */

:root {
  --apple-bg: #f5f5f7;
  --apple-card: #ffffff;
  --apple-border: rgba(0, 0, 0, 0.08);
  --apple-border-hover: rgba(0, 0, 0, 0.16);
  --apple-text: #1d1d1f;
  --apple-text-secondary: #86868b;
  --apple-text-tertiary: #6e6e73;
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --apple-blue-light: rgba(0, 113, 227, 0.08);
  --apple-green: #34c759;
  --apple-green-light: rgba(52, 199, 89, 0.12);
  --apple-red: #ff3b30;
  --apple-red-light: rgba(255, 59, 48, 0.1);
  --apple-orange: #ff9500;
  --apple-radius-sm: 8px;
  --apple-radius-md: 14px;
  --apple-radius-lg: 20px;
  --apple-radius-pill: 9999px;
  --apple-shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.04);
  --apple-shadow-card: 0 8px 30px rgba(0, 0, 0, 0.06);
  --apple-shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.09);
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Menlo, monospace;
}

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

html, body {
  min-height: 100%;
}

body {
  background-color: var(--apple-bg);
  color: var(--apple-text);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================================
   TOP NAVIGATION BAR (APPLE STUDIO)
   ======================================================== */
.navbar-apple-editor {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--apple-border);
  padding: 0.75rem 1.5rem;
  transition: var(--transition-smooth);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand-group {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--apple-text);
  text-decoration: none;
  letter-spacing: -0.4px;
}

.brand-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--apple-blue);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--apple-blue);
}

.brand-separator {
  color: var(--apple-text-secondary);
  font-weight: 300;
  font-size: 1.1rem;
}

.editor-course-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--apple-text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Engine status pill */
.engine-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--apple-border);
  padding: 0.4rem 0.9rem;
  border-radius: var(--apple-radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--apple-text-secondary);
  box-shadow: var(--apple-shadow-subtle);
  transition: var(--transition-smooth);
}

.engine-status-pill .status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--apple-orange);
  box-shadow: 0 0 6px var(--apple-orange);
  transition: var(--transition-smooth);
}

.engine-status-pill.ready {
  border-color: rgba(52, 199, 89, 0.3);
  background: #f0fdf4;
  color: #15803d;
}

.engine-status-pill.ready .status-indicator {
  background: var(--apple-green);
  box-shadow: 0 0 8px rgba(52, 199, 89, 0.7);
}

.engine-status-pill.error {
  border-color: rgba(255, 59, 48, 0.3);
  background: #fef2f2;
  color: #b91c1c;
}

.engine-status-pill.error .status-indicator {
  background: var(--apple-red);
  box-shadow: 0 0 8px rgba(255, 59, 48, 0.7);
}

.btn-apple-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--apple-card);
  border: 1px solid var(--apple-border);
  color: var(--apple-text);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.42rem 1rem;
  border-radius: var(--apple-radius-pill);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.btn-apple-back:hover {
  background: #e8e8ed;
  border-color: rgba(0, 0, 0, 0.15);
  transform: translateY(-1px);
}

/* ========================================================
   MAIN LAYOUT
   ======================================================== */
.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 991px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

/* ========================================================
   SIDEBAR: EXERCISE LIST
   ======================================================== */
.sidebar {
  background: var(--apple-card);
  border: 1px solid var(--apple-border);
  border-radius: var(--apple-radius-lg);
  box-shadow: var(--apple-shadow-card);
  overflow: hidden;
  position: sticky;
  top: 75px;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 100px);
}

.sidebar-header {
  padding: 16px 20px;
  background: #fbfbfd;
  border-bottom: 1px solid var(--apple-border);
}

.sidebar-header h2 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--apple-text);
  letter-spacing: -0.2px;
}

.badge-count {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--apple-blue-light);
  color: var(--apple-blue);
  padding: 3px 9px;
  border-radius: var(--apple-radius-pill);
}

.exercise-list-scroll {
  overflow-y: auto;
  flex-grow: 1;
  padding: 6px;
}

/* Custom Scrollbar */
.exercise-list-scroll::-webkit-scrollbar {
  width: 6px;
}
.exercise-list-scroll::-webkit-scrollbar-thumb {
  background: #d2d2d7;
  border-radius: 999px;
}

.ex-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--apple-radius-sm);
  color: var(--apple-text);
  padding: 11px 14px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: var(--transition-smooth);
  margin-bottom: 3px;
}

.ex-item:hover {
  background: #f5f5f7;
  border-color: rgba(0, 0, 0, 0.04);
}

.ex-item.active {
  background: #f0f7ff;
  border-color: rgba(0, 113, 227, 0.25);
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.08);
}

.ex-badge {
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--apple-border);
  background: #fbfbfd;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--apple-text-secondary);
  transition: var(--transition-smooth);
}

.ex-item.active .ex-badge {
  background: var(--apple-blue);
  border-color: var(--apple-blue);
  color: #ffffff;
}

.ex-item.solved .ex-badge {
  background: var(--apple-green);
  border-color: var(--apple-green);
  color: #ffffff;
  font-weight: 800;
}

.ex-item .ex-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--apple-text);
  line-height: 1.3;
}

.ex-item .ex-diff {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--apple-text-tertiary);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sidebar-footer {
  padding: 14px 18px;
  background: #fbfbfd;
  border-top: 1px solid var(--apple-border);
}

.progress-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--apple-text-secondary);
  margin-bottom: 8px;
}

.progress-bar {
  height: 8px;
  border-radius: var(--apple-radius-pill);
  background: #e5e5ea;
  overflow: hidden;
}

.progress-bar > div {
  height: 100%;
  background: linear-gradient(90deg, var(--apple-blue) 0%, var(--apple-green) 100%);
  width: 0%;
  border-radius: var(--apple-radius-pill);
  transition: width 0.4s ease;
}

/* ========================================================
   MAIN WORKSPACE CARDS
   ======================================================== */
.main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--apple-card);
  border: 1px solid var(--apple-border);
  border-radius: var(--apple-radius-lg);
  box-shadow: var(--apple-shadow-card);
  padding: 24px;
  position: relative;
  transition: var(--transition-smooth);
}

/* Exercise Header Row */
.exercise-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.eyebrow-apple {
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--apple-blue);
}

.exercise-intro-card h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--apple-text);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.exercise-intro-card p.desc {
  font-size: 0.98rem;
  color: var(--apple-text-secondary);
  line-height: 1.6;
  max-width: 820px;
}

.schema-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--apple-bg);
  border: 1px solid var(--apple-border);
  color: var(--apple-text);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--apple-radius-pill);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.schema-toggle:hover {
  background: #e8e8ed;
  border-color: rgba(0, 0, 0, 0.15);
  transform: translateY(-1px);
}

/* Schema Panel */
#schema-panel {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--apple-border);
  gap: 16px;
  grid-template-columns: repeat(3, 1fr);
}

#schema-panel.open {
  display: grid;
}

@media (max-width: 900px) {
  #schema-panel {
    grid-template-columns: 1fr;
  }
}

.schema-table {
  border: 1px solid var(--apple-border);
  border-radius: var(--apple-radius-md);
  overflow: hidden;
  background: #ffffff;
  box-shadow: var(--apple-shadow-subtle);
}

.schema-table .st-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--apple-blue);
  background: #fbfbfd;
  padding: 10px 14px;
  border-bottom: 1px solid var(--apple-border);
}

.schema-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.schema-table th, .schema-table td {
  text-align: left;
  padding: 7px 12px;
  border-bottom: 1px solid var(--apple-border);
  color: var(--apple-text-tertiary);
  white-space: nowrap;
}

.schema-table th {
  background: #f5f5f7;
  color: var(--apple-text);
  font-weight: 600;
}

.schema-table tr:last-child td {
  border-bottom: none;
}

/* ========================================================
   CERTIFICATE CARD
   ======================================================== */
.card.certificate {
  background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 100%);
  border: 1.5px solid rgba(52, 199, 89, 0.4);
  box-shadow: 0 12px 35px rgba(52, 199, 89, 0.1);
}

.card.certificate[hidden] {
  display: none;
}

.certificate-inner {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.certificate-icon-badge {
  width: 52px;
  height: 52px;
  border-radius: var(--apple-radius-md);
  background: var(--apple-green);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
  box-shadow: 0 8px 20px rgba(52, 199, 89, 0.3);
}

.certificate-content h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--apple-text);
  margin-bottom: 4px;
}

.certificate-content p.desc {
  font-size: 0.95rem;
  color: var(--apple-text-secondary);
  margin-bottom: 16px;
}

.student-name {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--apple-text);
  margin-bottom: 8px;
}

.input-action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.certificate-input {
  width: min(100%, 380px);
  padding: 10px 14px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  border-radius: var(--apple-radius-sm);
  border: 1px solid var(--apple-border);
  background-color: #ffffff;
  color: var(--apple-text);
  outline: none;
  transition: var(--transition-smooth);
}

.certificate-input:focus {
  border-color: var(--apple-green);
  box-shadow: 0 0 0 4px rgba(52, 199, 89, 0.15);
}

.btn-certificate-action {
  background: var(--apple-green);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 20px;
  border-radius: var(--apple-radius-pill);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 14px rgba(52, 199, 89, 0.3);
}

.btn-certificate-action:hover {
  background: #2cb34e;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(52, 199, 89, 0.4);
}

.certificate-note {
  font-size: 0.8rem;
  color: var(--apple-text-secondary);
  margin-top: 10px;
}

/* ========================================================
   CODE PLAYGROUND (macOS Window Style)
   ======================================================== */
.editor-wrap {
  border-radius: var(--apple-radius-md);
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
  background: #18181b;
}

.editor-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #27272a;
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mac-traffic-lights {
  display: flex;
  align-items: center;
  gap: 7px;
}

.mac-traffic-lights span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.editor-filename {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: #a1a1aa;
}

.editor-hint {
  font-size: 0.75rem;
  color: #71717a;
}

#sql-input {
  width: 100%;
  min-height: 160px;
  resize: vertical;
  background: #18181b;
  border: none;
  outline: none;
  color: #f4f4f5;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.6;
  padding: 16px;
}

#sql-input::placeholder {
  color: #52525b;
}

/* Custom Scrollbar for Textarea */
#sql-input::-webkit-scrollbar {
  width: 8px;
}
#sql-input::-webkit-scrollbar-thumb {
  background: #3f3f46;
  border-radius: 999px;
}

/* Editor Action Buttons */
.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

button.btn {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 9px 20px;
  border-radius: var(--apple-radius-pill);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

button.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

.btn-run {
  background: var(--apple-blue);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.25);
}

.btn-run:hover:not(:disabled) {
  background: var(--apple-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 113, 227, 0.35);
}

.btn-check {
  background: var(--apple-green);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(52, 199, 89, 0.25);
}

.btn-check:hover:not(:disabled) {
  background: #2cb34e;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(52, 199, 89, 0.35);
}

.btn-clear {
  background: var(--apple-bg);
  border: 1px solid var(--apple-border);
  color: var(--apple-text-secondary);
}

.btn-clear:hover:not(:disabled) {
  background: #e8e8ed;
  color: var(--apple-red);
  border-color: rgba(255, 59, 48, 0.3);
}

/* ========================================================
   FEEDBACK BANNER
   ======================================================== */
#feedback {
  display: none;
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--apple-radius-md);
  font-size: 0.92rem;
  line-height: 1.5;
  font-weight: 500;
}

#feedback.ok {
  display: block;
  background: #f0fdf4;
  border: 1px solid rgba(52, 199, 89, 0.35);
  color: #166534;
}

#feedback.bad {
  display: block;
  background: #fef2f2;
  border: 1px solid rgba(255, 59, 48, 0.35);
  color: #991b1b;
}

/* ========================================================
   RESULTS TABLE
   ======================================================== */
#results {
  margin-top: 20px;
}

#results .meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--apple-text-secondary);
  margin-bottom: 10px;
  display: inline-block;
  background: #f5f5f7;
  padding: 4px 12px;
  border-radius: var(--apple-radius-pill);
}

.result-table-wrap {
  overflow: auto;
  border: 1px solid var(--apple-border);
  border-radius: var(--apple-radius-md);
  max-height: 380px;
  box-shadow: var(--apple-shadow-subtle);
  background: #ffffff;
}

table.result-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

table.result-table th {
  position: sticky;
  top: 0;
  background: #fbfbfd;
  color: var(--apple-text);
  font-weight: 700;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--apple-border);
  white-space: nowrap;
}

table.result-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--apple-border);
  color: var(--apple-text);
  white-space: nowrap;
}

table.result-table tr:last-child td {
  border-bottom: none;
}

table.result-table tr:hover td {
  background: #f8fafc;
}

.error-box {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #b91c1c;
  background: #fef2f2;
  border: 1px solid rgba(255, 59, 48, 0.25);
  border-radius: var(--apple-radius-md);
  padding: 14px 16px;
  white-space: pre-wrap;
}