/* ========================================
   Design Tokens
   ======================================== */
:root {
  --cyan-light: #0e9aa7;
  --cyan: #00838f;
  --blue: #1976D2;
  --blue-dark: #1565C0;
  --blue-deepest: #0D47A1;

  --gradient-brand: linear-gradient(135deg, #4ECDC4 0%, #00BCD4 30%, #2196F3 70%, #1565C0 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(78,205,196,0.06), rgba(21,101,192,0.06));

  --bg-base: #f5f7fa;
  --bg-surface: #ffffff;
  --bg-elevated: #edf0f5;
  --bg-card: rgba(255, 255, 255, 0.85);

  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-muted: #94a3b8;

  --color-pass: #16a34a;
  --color-fail: #dc2626;
  --color-warn: #d97706;

  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(0, 131, 143, 0.12);
  --glass-blur: 16px;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Noto Sans SC', -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-glow-cyan: 0 0 20px rgba(0,131,143,0.1);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 600ms;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========================================
   Background Noise
   ======================================== */
.bg-noise {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  pointer-events: none;
}

/* ========================================
   Header
   ======================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
}

.app-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-2xl);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.app-subtitle {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}

.section {
  animation: fade-in-up var(--duration-slow) var(--ease-out-expo) both;
}

.hidden {
  display: none !important;
}

/* ========================================
   Upload Zone
   ======================================== */
.upload-zone {
  border: 2px dashed rgba(0, 131, 143, 0.25);
  border-radius: var(--radius-xl);
  padding: var(--space-16) var(--space-8);
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-subtle);
  opacity: 0;
  transition: opacity var(--duration-normal);
  border-radius: inherit;
}

.upload-zone:hover {
  border-color: rgba(0, 131, 143, 0.4);
  transform: scale(1.005);
  box-shadow: var(--shadow-glow-cyan);
}

.upload-zone:hover::before {
  opacity: 1;
}

.upload-zone.drag-over {
  border-style: solid;
  border-color: var(--cyan);
  animation: pulse-border 1.2s ease-in-out infinite;
  box-shadow: var(--shadow-glow-cyan), 0 0 40px rgba(0,131,143,0.08);
}

.upload-zone.drag-over::before {
  opacity: 1;
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  transition: color var(--duration-normal);
  position: relative;
  z-index: 1;
}

.upload-zone:hover .upload-icon {
  color: var(--cyan-light);
}

.upload-title {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  position: relative;
  z-index: 1;
}

.upload-hint {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.upload-error {
  text-align: center;
  color: var(--color-fail);
  font-size: var(--text-sm);
  margin-top: var(--space-4);
  animation: fade-in-up var(--duration-normal) var(--ease-out-expo);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast);
  position: relative;
  z-index: 1;
}

.btn-primary {
  background: var(--gradient-brand);
  color: white;
  box-shadow: 0 2px 8px rgba(0, 188, 212, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 16px rgba(0, 188, 212, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: rgba(0, 131, 143, 0.25);
}

.btn-small {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-copy {
  background: rgba(0, 131, 143, 0.06);
  color: var(--cyan);
  border: 1px solid rgba(0, 131, 143, 0.2);
}

.btn-copy:hover {
  background: rgba(0, 131, 143, 0.12);
}

.btn-copy.copied {
  background: rgba(22, 163, 74, 0.08);
  color: var(--color-pass);
  border-color: rgba(22, 163, 74, 0.25);
}

/* ========================================
   Glass Card
   ======================================== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

/* ========================================
   Processing
   ======================================== */
.processing-card {
  text-align: center;
  padding: var(--space-12) var(--space-8);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(0, 131, 143, 0.15);
  border-top-color: var(--cyan);
  border-radius: 50%;
  margin: 0 auto var(--space-6);
  animation: spin 0.8s linear infinite;
}

.progress-bar-track {
  width: 100%;
  max-width: 320px;
  height: 4px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 2px;
  margin: 0 auto var(--space-4);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--gradient-brand);
  border-radius: 2px;
  transition: width 400ms ease-out;
}

.processing-status {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* ========================================
   Report — Summary
   ======================================== */
.summary-card {
  margin-bottom: var(--space-6);
  animation: fade-in-up var(--duration-slow) var(--ease-out-expo) both;
}

.summary-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-6);
}

.summary-status {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.status-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: var(--text-base);
  font-weight: 700;
}

.status-icon.status-pass {
  background: rgba(22, 163, 74, 0.1);
  color: var(--color-pass);
  border: 1.5px solid rgba(22, 163, 74, 0.25);
}

.status-icon.status-fail {
  background: rgba(220, 38, 38, 0.1);
  color: var(--color-fail);
  border: 1.5px solid rgba(220, 38, 38, 0.25);
}

.summary-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-xl);
}

.summary-title.text-pass { color: var(--color-pass); }
.summary-title.text-fail { color: var(--color-fail); }

.summary-file {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  word-break: break-all;
}

.summary-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.summary-stats {
  display: flex;
  gap: var(--space-6);
  flex-shrink: 0;
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 700;
  font-family: var(--font-display);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-errors .stat-value {
  background: none;
  -webkit-text-fill-color: var(--color-fail);
  color: var(--color-fail);
}

.stat-warnings .stat-value {
  background: none;
  -webkit-text-fill-color: var(--color-warn);
  color: var(--color-warn);
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ========================================
   Report — Panel
   ======================================== */
.report-panel {
  margin-bottom: var(--space-4);
  animation: card-enter var(--duration-slow) var(--ease-out-expo) both;
  animation-delay: 150ms;
}

.report-panel:nth-child(3) {
  animation-delay: 250ms;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.panel-title svg {
  color: var(--cyan-light);
  flex-shrink: 0;
}

.empty-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--text-sm);
  padding: var(--space-4) 0;
}

/* ========================================
   Report — Front Matter Data
   ======================================== */
.data-row {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.data-row:last-child {
  border-bottom: none;
}

.data-label {
  width: 5.5em;
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--cyan-light);
  padding-top: 2px;
}

.data-value {
  flex: 1;
  min-width: 0;
}

.data-value-text {
  font-size: var(--text-sm);
  color: var(--text-primary);
  line-height: 1.6;
}

.data-cn {
  font-size: var(--text-sm);
  color: var(--text-primary);
  line-height: 1.6;
}

.data-en {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 2px;
}

/* Author table */
.author-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.author-table td {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  vertical-align: middle;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

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

.author-table td.author-cn { width: 30%; }
.author-table td.author-affs { width: 10%; }
.author-table td.author-en { width: 40%; }

.author-cn {
  color: var(--text-primary);
  white-space: nowrap;
}

.author-en {
  color: var(--text-secondary);
  white-space: nowrap;
}

/* 作者行高亮 */
.author-table tr.author-row-highlight {
  background: rgba(0, 131, 143, 0.06);
}

.author-cn.author-highlight {
  color: var(--cyan);
}

.author-en.author-highlight {
  color: var(--cyan);
}

.author-aff-mismatch,
.author-aff-missing {
  color: var(--color-fail);
}

.author-affs {
  display: flex;
  gap: 4px;
  white-space: nowrap;
}

/* Affiliation badge (boxed number) */
.aff-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 5px;
  background: rgba(0, 131, 143, 0.08);
  border: 1.5px solid rgba(0, 131, 143, 0.3);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--cyan);
  cursor: pointer;
  transition: all var(--duration-fast);
  user-select: none;
}

.aff-badge:hover {
  background: rgba(0, 131, 143, 0.15);
  border-color: var(--cyan);
  box-shadow: 0 0 6px rgba(0,131,143,0.15);
}

.aff-badge-invalid {
  background: rgba(220, 38, 38, 0.08);
  border-color: rgba(220, 38, 38, 0.35);
  color: var(--color-fail);
}

.aff-badge-invalid:hover {
  background: rgba(220, 38, 38, 0.15);
  border-color: var(--color-fail);
  box-shadow: 0 0 6px rgba(220, 38, 38, 0.15);
}

/* Affiliation block */
.aff-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.aff-group {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
}

.aff-line {
  padding: 2px 4px;
  border-radius: 4px;
  transition: background var(--duration-fast), color var(--duration-fast);
  cursor: default;
}

.aff-line-cn {
  font-size: var(--text-sm);
  color: var(--text-primary);
  line-height: 1.6;
}

.aff-line-en {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.aff-line.aff-highlight {
  background: rgba(0, 131, 143, 0.08);
  color: var(--cyan);
}

.aff-orphan {
  color: var(--color-fail);
}

.aff-id-orphan {
  border-color: rgba(220, 38, 38, 0.3);
  color: var(--color-fail);
}

.aff-id-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 5px;
  background: rgba(0, 0, 0, 0.04);
  border: 1.5px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
  margin-top: 2px;
}

.aff-highlight .aff-id-label {
  border-color: rgba(0, 131, 143, 0.4);
  color: var(--cyan);
}

.aff-text-wrap {
  flex: 1;
  min-width: 0;
}

/* Keywords table */
.keywords-table {
  width: 100%;
  border-collapse: collapse;
}

.keywords-table td {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  vertical-align: middle;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

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

.kw-cn {
  color: var(--text-primary);
  width: 50%;
}

.kw-en {
  color: var(--text-secondary);
}

.kw-unpaired {
  color: var(--color-fail);
}

/* ========================================
   Report — Elements
   ======================================== */
.elements-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.element-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(0, 0, 0, 0.015);
  border-left: 3px solid transparent;
  border-radius: var(--radius-md);
  transition: background var(--duration-fast), transform var(--duration-fast);
  animation: card-enter var(--duration-slow) var(--ease-out-expo) both;
}

.element-card:hover {
  background: rgba(0, 0, 0, 0.03);
  transform: translateX(2px);
}

.element-type {
  font-size: var(--text-sm);
  font-weight: 600;
  flex-shrink: 0;
  width: 5em;
}

.element-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 6px;
  border-radius: 4px;
  flex-shrink: 0;
  width: 3em;
  text-align: center;
}

.element-index.pi-error {
  background: rgba(220, 38, 38, 0.08);
  color: var(--color-fail);
  border: 1px solid rgba(220, 38, 38, 0.25);
}

.element-index.pi-warning {
  background: rgba(217, 119, 6, 0.08);
  color: var(--color-warn);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.element-index.pi-info {
  background: rgba(148, 163, 184, 0.08);
  color: var(--text-secondary);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.element-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
  min-width: 0;
}

.confidence-badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 1px 8px;
  border-radius: 10px;
  font-weight: 500;
  flex-shrink: 0;
}

.conf-high {
  background: rgba(22, 163, 74, 0.08);
  color: var(--color-pass);
}

.conf-mid {
  background: rgba(217, 119, 6, 0.08);
  color: var(--color-warn);
}

.conf-low {
  background: rgba(220, 38, 38, 0.08);
  color: var(--color-fail);
}

/* ========================================
   Report — Issues
   ======================================== */
.issues-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.issue-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  animation: card-enter var(--duration-slow) var(--ease-out-expo) both;
}

.issue-card.severity-error {
  background: rgba(220, 38, 38, 0.05);
  border-left: 3px solid var(--color-fail);
}

.issue-card.severity-warning {
  background: rgba(217, 119, 6, 0.05);
  border-left: 3px solid var(--color-warn);
}

.issue-card.severity-info {
  background: rgba(148, 163, 184, 0.06);
  border-left: 3px solid var(--text-muted);
}

.issue-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.issue-icon.severity-error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--color-fail);
}

.issue-icon.severity-warning {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warn);
}

.issue-icon.severity-info {
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-muted);
}

.issue-body {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: nowrap;
}

.issue-message {
  flex: 1;
  min-width: 0;
}

.issue-type-badge {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 4px;
}

.issue-type-badge.severity-error {
  background: rgba(220, 38, 38, 0.08);
  color: var(--color-fail);
}

.issue-type-badge.severity-warning {
  background: rgba(217, 119, 6, 0.08);
  color: var(--color-warn);
}

.issue-type-badge.severity-info {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-muted);
}

.issue-category-badge {
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 1px 6px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-secondary);
}

.issue-message {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.issue-paragraphs {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 6px;
  border-radius: 4px;
}

.issue-type-name {
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0 1px;
}

.bad-punct {
  color: var(--color-fail);
  font-weight: 700;
}

/* ========================================
   Action Buttons
   ======================================== */
.action-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}

/* ========================================
   Floating Upload FAB
   ======================================== */
/* Floating upload: outer hit zone */
.fab-zone {
  position: fixed;
  right: 12px;
  top: 100px;
  z-index: 200;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: var(--space-4);
  border-radius: var(--radius-xl);
}

.fab-zone.visible {
  display: flex;
}

/* Circle icon */
.fab-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 131, 143, 0.25), 0 2px 6px rgba(0,0,0,0.1);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}

.fab-label {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  white-space: nowrap;
}

.fab-zone:hover .fab-circle {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(0, 131, 143, 0.35), 0 2px 8px rgba(0,0,0,0.1);
}

.fab-zone:active .fab-circle {
  transform: scale(0.95);
}

.fab-zone.fab-drag-over .fab-circle {
  transform: scale(1.18);
  box-shadow: 0 0 32px rgba(0, 131, 143, 0.4), 0 6px 20px rgba(0, 131, 143, 0.2);
}

.fab-zone.fab-drag-over .fab-label {
  color: var(--cyan);
  font-weight: 600;
}

/* ========================================
   Footer
   ======================================== */
.app-footer {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  color: var(--text-muted);
  font-size: var(--text-xs);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* ========================================
   Tooltip
   ======================================== */
[data-tooltip] {
  position: relative;
  cursor: help;
}

[data-tooltip]::before,
[data-tooltip]::after {
  position: absolute;
  left: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-fast), transform var(--duration-fast);
  z-index: 300;
}

/* 气泡主体 */
[data-tooltip]::after {
  content: attr(data-tooltip);
  bottom: calc(100% + 8px);
  transform: translateX(-50%) translateY(4px);
  background: #1a202c;
  color: #f0f4f8;
  font-size: var(--text-xs);
  font-weight: 400;
  line-height: 1.5;
  padding: 6px 10px;
  border-radius: 6px;
  width: max-content;
  max-width: 420px;
  white-space: pre-line;
  text-align: left;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 小尖角 */
[data-tooltip]::before {
  content: '';
  bottom: calc(100% + 2px);
  transform: translateX(-50%) translateY(4px);
  border: 6px solid transparent;
  border-top-color: #1a202c;
}

[data-tooltip]:hover::before,
[data-tooltip]:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse-border {
  0%, 100% { border-color: var(--cyan); }
  50% { border-color: var(--cyan-light); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}

.shake {
  animation: shake 400ms ease-in-out;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .header-inner {
    padding: var(--space-3) var(--space-4);
  }

  .logo {
    width: 40px;
    height: 40px;
  }

  .app-title {
    font-size: var(--text-xl);
  }

  .main-content {
    padding: var(--space-6) var(--space-4) var(--space-12);
  }

  .upload-zone {
    padding: var(--space-12) var(--space-6);
  }

  .summary-header {
    flex-direction: column;
  }

  .summary-stats {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .upload-zone {
    padding: var(--space-8) var(--space-4);
    border-radius: var(--radius-lg);
  }

  .glass-card {
    padding: var(--space-4);
    border-radius: var(--radius-md);
  }

  .xml-panel-header {
    padding: var(--space-3) var(--space-4);
  }

  .xml-panel-body pre {
    padding: 0 var(--space-4) var(--space-4);
  }
}