/* ===== Custom Properties ===== */
:root {
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #e0e7ff;
  --color-primary-bg: #eef2ff;
  --color-success: #16a34a;
  --color-success-light: #dcfce7;
  --color-danger: #dc2626;
  --color-danger-light: #fee2e2;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --max-width: 640px;
}

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

/* ===== Base ===== */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
  line-height: 1.5;
}

/* ===== App Header ===== */
.app-header {
  text-align: center;
  padding: 24px 16px 8px;
}

.app-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.app-tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* ===== Navigation ===== */
.app-nav {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 12px 16px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-link {
  flex: 1;
  text-align: center;
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: background 0.15s, color 0.15s;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-link:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-link.active {
  background: var(--color-primary);
  color: #fff;
}

/* ===== Main Content ===== */
.app-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px;
}

/* ===== Page Sections ===== */
.page {
  animation: fadeIn 0.2s ease;
}

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

.page-greeting {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.page-greeting a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

/* ===== Card / Panel ===== */
.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  margin-bottom: 16px;
}

/* ===== Forms ===== */
label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

input[type="text"],
textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.15s;
  -webkit-appearance: none;
  appearance: none;
}

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.form-group {
  margin-bottom: 16px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-stack);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  min-height: 44px;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

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

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

.btn-secondary:hover:not(:disabled) {
  background: #c7d2fe;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
  min-height: 36px;
}

/* ===== Suggestions Panel ===== */
.suggestions-panel {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
  animation: fadeIn 0.2s ease;
}

.suggestions-panel h3 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.suggestions-panel .corrected-text {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  line-height: 1.5;
  border: 1px solid var(--color-border);
}

.suggestions-panel ul {
  list-style: none;
  padding: 0;
}

.suggestions-panel li {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.suggestions-panel li::before {
  content: "\2022";
  color: var(--color-primary);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.no-suggestions {
  background: var(--color-success-light);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--color-success);
  font-weight: 600;
  animation: fadeIn 0.2s ease;
}

/* ===== Win Card ===== */
.win-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  margin-bottom: 12px;
}

.win-card-date {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.win-card-text {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 8px;
}

.win-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 99px;
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.win-card-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.btn-delete {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  font-family: var(--font-stack);
}

.btn-delete:hover {
  color: var(--color-danger);
  background: var(--color-danger-light);
}

/* ===== Output Tabs ===== */
.output-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.output-tab {
  flex: 1;
  text-align: center;
  padding: 10px 8px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-family: var(--font-stack);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  min-height: 44px;
}

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

.output-tab.active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow);
}

/* ===== AI Content Panel ===== */
.ai-content {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-border);
  animation: fadeIn 0.2s ease;
}

.ai-content h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.ai-content p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
}

.ai-content ul {
  list-style: none;
  padding: 0;
}

.ai-content li {
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.5;
  border-bottom: 1px solid var(--color-border);
}

.ai-content li:last-child {
  border-bottom: none;
}

.ai-content li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-secondary);
}

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.empty-state h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
  color: var(--color-text);
}

.empty-state p {
  font-size: 0.9rem;
}

/* ===== Loading Spinner ===== */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--color-primary-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.spinner-white {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
}

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

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: calc(100vw - 32px);
  width: var(--max-width);
}

.toast {
  background: var(--color-text);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.25s ease, toastOut 0.25s ease 2.5s forwards;
  pointer-events: auto;
}

.toast-success {
  background: var(--color-success);
}

.toast-error {
  background: var(--color-danger);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ===== Utility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

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

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }

/* ===== Desktop Breakpoint ===== */
@media (min-width: 768px) {
  .app-header {
    padding-top: 32px;
  }

  .app-title {
    font-size: 2rem;
  }

  .app-main {
    padding: 24px;
  }

  .nav-link {
    font-size: 0.9rem;
  }

  .output-tab {
    font-size: 0.85rem;
  }

  .card {
    padding: 24px;
  }
}