/* ============================================================
   PHP Error Log Viewer — Styles
   Zero-dependency, CSS custom properties, responsive
   ============================================================ */

/* ----- CSS Custom Properties (Theming) ----- */
:root {
  /* Colors — Light theme */
  --color-bg:            #f8f9fa;
  --color-surface:       #ffffff;
  --color-border:        #dee2e6;
  --color-border-light:  #e9ecef;
  --color-text:          #212529;
  --color-text-secondary:#6c757d;
  --color-text-muted:    #adb5bd;
  --color-primary:       #4361ee;
  --color-primary-hover: #3a56d4;
  --color-primary-light: #eef0fd;
  --color-accent:        #f72585;
  --color-success:       #06d6a0;
  --color-warning:       #ffd166;
  --color-danger:        #ef476f;
  --color-danger-light:  #fde8ed;

  /* Severity colors */
  --severity-fatal:      #ef476f;
  --severity-warning:    #ffd166;
  --severity-notice:     #118ab2;
  --severity-deprecated: #a0a0a0;
  --severity-parse:      #ef476f;
  --severity-unknown:    #6c757d;

  /* Typography */
  --font-family:         -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                          "Helvetica Neue", Arial, sans-serif;
  --font-mono:           "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono",
                          "Cascadia Code", Consolas, monospace;
  --font-size-xs:        0.75rem;
  --font-size-sm:        0.8125rem;
  --font-size-base:      0.9375rem;
  --font-size-lg:        1.125rem;
  --font-size-xl:        1.5rem;
  --font-size-2xl:       1.875rem;

  /* Spacing */
  --space-xs:            0.25rem;
  --space-sm:            0.5rem;
  --space-md:            0.75rem;
  --space-lg:            1rem;
  --space-xl:            1.5rem;
  --space-2xl:           2rem;
  --space-3xl:           3rem;

  /* Borders & Radii */
  --radius-sm:           4px;
  --radius-md:           8px;
  --radius-lg:           12px;
  --radius-xl:           16px;
  --radius-full:         9999px;

  /* Shadows */
  --shadow-sm:           0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:           0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg:           0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.08);

  /* Transitions */
  --transition-fast:     150ms ease;
  --transition-base:     200ms ease;
  --transition-slow:     300ms ease;

  /* Layout */
  --max-width:           1100px;
  --header-height:       64px;
}

/* ----- Dark Theme ----- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:            #1a1a2e;
    --color-surface:       #16213e;
    --color-border:        #2a2a4a;
    --color-border-light:  #1f1f3a;
    --color-text:          #e4e6eb;
    --color-text-secondary:#b0b3b8;
    --color-text-muted:    #6c6e7a;
    --color-primary:       #6c83f7;
    --color-primary-hover: #8295f9;
    --color-primary-light: #1e2545;
    --color-danger-light:  #2d1a24;

    --shadow-sm:           0 1px 2px rgba(0,0,0,0.2);
    --shadow-md:           0 4px 6px rgba(0,0,0,0.3);
    --shadow-lg:           0 10px 25px rgba(0,0,0,0.4);
  }
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ----- Header ----- */
.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--space-2xl);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.app-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: none;
}

@media (min-width: 600px) {
  .app-subtitle { display: inline; }
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.timezone-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.timezone-select {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
  max-width: 220px;
  transition: border-color var(--transition-fast);
}

.timezone-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ----- Main ----- */
.app-main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

/* ----- Section Headings ----- */
.section-heading {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

/* ----- Tab Bar ----- */
.tab-bar {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--color-border-light);
  margin-bottom: var(--space-lg);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-icon {
  flex-shrink: 0;
}

/* ----- Tab Panels ----- */
.tab-panel {
  animation: fadeIn var(--transition-base);
}

.tab-panel[hidden] {
  display: none;
}

/* ----- Example Panel ----- */
.example-panel {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-md);
  max-width: 520px;
}

.example-desc {
  margin: 0;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ----- Drop Zone (File Upload) ----- */
.drop-zone {
  position: relative;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.drop-zone-content {
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.drop-icon {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.drop-text {
  font-size: var(--font-size-base);
  color: var(--color-text);
}

.drop-link {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.drop-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.drop-hint code {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  background: var(--color-bg);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
}

/* ----- Paste Textarea ----- */
.paste-textarea {
  width: 100%;
  min-height: 240px;
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.paste-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.paste-textarea::placeholder {
  color: var(--color-text-muted);
}

/* ----- URL Input ----- */
.url-input-row {
  display: flex;
  gap: var(--space-md);
}

.url-input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.url-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.url-input::placeholder {
  color: var(--color-text-muted);
}

.input-hint {
  margin-top: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  color: #fff;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-secondary {
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-color: transparent;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary);
  color: #fff;
}

.btn-ghost {
  color: var(--color-text-secondary);
  background: transparent;
  border-color: var(--color-border);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-danger);
  border-color: var(--color-danger);
  background: var(--color-danger-light);
}

/* ----- Stats Bar ----- */
.stats-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-actions {
  margin-left: auto;
  display: flex;
  gap: var(--space-sm);
}

/* ----- Empty State ----- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  color: var(--color-text-muted);
}

.empty-state h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.empty-state p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  max-width: 320px;
}

.empty-state[hidden] {
  display: none;
}

.empty-icon {
  opacity: 0.5;
}

/* ----- Table Container ----- */
.table-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.table-container[hidden] {
  display: none;
}

/* ----- Results Table ----- */
.results-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
}

.results-table thead {
  background: var(--color-bg);
}

.results-table thead th {
  border-bottom: 2px solid var(--color-border);
  background: var(--color-bg);
}

.results-table th {
  position: sticky;
  top: var(--header-height);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-align: left;
  user-select: none;
  white-space: nowrap;
  background: var(--color-bg);
  z-index: 10;
}

.results-table th.sortable {
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.results-table th.sortable:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.results-table th[aria-sort="ascending"] .sort-indicator,
.results-table th[aria-sort="descending"] .sort-indicator {
  color: var(--color-primary);
}

.sort-indicator {
  font-size: var(--font-size-xs);
  margin-left: var(--space-xs);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.results-table th[aria-sort] .sort-indicator {
  opacity: 1;
}

/* Column widths */
.col-count  { width: 90px; }
.col-time   { width: 180px; }
.col-message { width: auto; }

/* ----- Table Body ----- */
.results-table tbody tr {
  transition: background var(--transition-fast);
}

.results-table tbody td {
  border-bottom: 1px solid var(--color-border-light);
}

.results-table tbody tr.group-row {
  cursor: pointer;
}

.results-table tbody tr.group-row:hover td {
  background: var(--color-primary-light);
}

.results-table tbody tr.expanded-row td {
  background: var(--color-bg);
}

.results-table td {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  vertical-align: top;
}

/* Count cell */
.count-cell {
  font-weight: 700;
  text-align: center;
}

.count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 28px;
  padding: 0 var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.count-badge.high-count {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

/* Time cell */
.time-cell {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Message cell */
.message-cell {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  word-break: break-word;
  line-height: 1.6;
}

.message-cell .severity-tag {
  display: inline-block;
  padding: 1px 6px;
  margin-right: var(--space-xs);
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
}

.severity-tag.sev-fatal   { background: var(--severity-fatal); color: #fff; }
.severity-tag.sev-warning { background: var(--severity-warning); color: #000; }
.severity-tag.sev-notice  { background: var(--severity-notice); color: #fff; }
.severity-tag.sev-deprecated { background: var(--severity-deprecated); color: #fff; }
.severity-tag.sev-parse   { background: var(--severity-parse); color: #fff; }
.severity-tag.sev-unknown { background: var(--severity-unknown); color: #fff; }

/* Expand indicator */
.expand-indicator {
  display: inline-block;
  width: 16px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.group-row.expanded .expand-indicator {
  transform: rotate(90deg);
}

/* Expanded child entries */
.child-entry {
  padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-2xl);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  border-top: 1px solid var(--color-border-light);
  word-break: break-all;
}

.child-entry .child-time {
  color: var(--color-text-muted);
  margin-right: var(--space-md);
  white-space: nowrap;
}

/* ----- Footer ----- */
.app-footer {
  text-align: center;
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.app-footer p {
  margin: 0;
}

.footer-meta {
  margin-top: var(--space-xs) !important;
}

/* ----- Loading Spinner ----- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ----- URL status ----- */
#url-status.loading {
  color: var(--color-primary);
}

#url-status.error {
  color: var(--color-danger);
}

#url-status.success {
  color: var(--color-success);
}

/* ----- URL download progress ----- */
.url-progress-wrapper {
  margin-top: var(--space-sm);
  height: 4px;
  background: var(--color-border-light);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.url-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

/* Native progress element — hidden; wrapper bar is used instead */
.url-progress {
  display: none;
}

/* ----- URL CORS notice ----- */
.url-cors-notice {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: #6d5e00;
  line-height: 1.7;
}

@media (prefers-color-scheme: dark) {
  .url-cors-notice {
    background: #2d2410;
    border-color: #5c4a00;
    color: #e6c300;
  }
}

.url-cors-notice summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-sm);
  padding: var(--space-xs) 0;
  user-select: none;
}

.url-cors-notice summary:hover {
  color: inherit;
  opacity: 0.85;
}

.url-cors-notice p {
  margin-top: var(--space-sm);
}

.url-cors-notice code {
  display: block;
  margin: var(--space-sm) 0;
  padding: var(--space-xs) var(--space-sm);
  background: rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  white-space: nowrap;
  overflow-x: auto;
}

.url-cors-notice ul {
  margin-top: var(--space-sm);
  padding-left: var(--space-xl);
}

.url-cors-notice li {
  margin-bottom: var(--space-xs);
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
  .app-header {
    padding: 0 var(--space-lg);
    height: auto;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
  }

  .app-main {
    padding: var(--space-lg) var(--space-md);
    gap: var(--space-lg);
  }

  .header-right {
    width: 100%;
  }

  .timezone-select {
    flex: 1;
    max-width: none;
  }

  .stats-bar {
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
  }

  .stat-actions {
    width: 100%;
    margin-left: 0;
  }

  .col-time {
    width: 120px;
  }

  .results-table th,
  .results-table td {
    padding: var(--space-sm) var(--space-md);
  }

  .url-input-row {
    flex-direction: column;
  }

  .tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  .col-time {
    display: none;
  }

  .results-table .col-time {
    display: none;
  }

  .results-table td:nth-child(2) {
    display: none;
  }

  .count-badge {
    min-width: 24px;
    height: 22px;
    font-size: 10px;
  }
}

/* ----- Print Styles ----- */
@media print {
  .app-header,
  .input-section,
  .stats-bar .stat-actions,
  .app-footer {
    display: none;
  }

  .results-table th {
    background: #fff !important;
    color: #000 !important;
  }

  .results-table td {
    color: #000 !important;
  }
}