/* ========================================
   AI News Monitor - Design System
   ======================================== */

:root {
  /* Color Palette */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --bg-card-hover: #1f2847;
  --bg-modal: #151d30;

  --text-primary: #f0f4ff;
  --text-secondary: #8b95b0;
  --text-muted: #5a6380;

  --accent-primary: #6366f1;
  --accent-primary-hover: #818cf8;
  --accent-secondary: #22d3ee;
  --accent-gradient: linear-gradient(135deg, #6366f1, #22d3ee);

  --danger: #f43f5e;
  --warning: #f59e0b;
  --success: #10b981;

  --border: rgba(99, 102, 241, 0.15);
  --border-hover: rgba(99, 102, 241, 0.3);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

  --transition: 0.2s ease;
}

/* ========================================
   Reset & Base
   ======================================== */

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

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

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

/* Animated background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(34, 211, 238, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  min-height: 100vh;
}

/* ========================================
   Header
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 1.6rem;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.7;
    transform: scale(1.1);
  }
}

.logo h1 {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.25);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.btn-warning {
  background: var(--warning);
  color: #000;
}

.btn-warning:hover {
  background: #fbbf24;
}

.btn-danger {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 6px 12px;
  font-size: 0.8rem;
}

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

.btn-icon {
  font-size: 1.1rem;
}

/* ========================================
   Tabs
   ======================================== */

.tabs {
  display: flex;
  gap: 0;
  padding: 0 16px;
  background: rgba(10, 14, 26, 0.6);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 16px;
  border: none;
  background: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

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

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

.tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
  font-size: 0.7rem;
  font-weight: 600;
}

.tab.active .tab-badge {
  background: var(--accent-primary);
  color: white;
}

/* ========================================
   Main Content
   ======================================== */

.main {
  padding: 16px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Feed Controls
   ======================================== */

.feed-controls {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.search-box {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent-primary);
}

.search-icon {
  font-size: 0.9rem;
  opacity: 0.5;
}

.search-box input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
}

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

.select {
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition);
  -webkit-appearance: none;
}

.select:focus {
  border-color: var(--accent-primary);
}

/* ========================================
   Article Cards
   ======================================== */

.articles-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-card {
  display: block;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateX(2px);
  box-shadow: var(--shadow-md);
}

.article-card:hover::before {
  opacity: 1;
}

.article-card.important {
  border-left: 3px solid var(--danger);
}

.article-card.important::before {
  background: var(--danger);
  opacity: 1;
  width: 3px;
  left: -3px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.article-source {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 500;
}

.badge-important {
  background: rgba(244, 63, 94, 0.15);
  color: var(--danger);
}

.badge-category {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary-hover);
}

.article-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: auto;
}

.article-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.article-summary {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.article-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.keyword-tag {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.7rem;
  background: rgba(34, 211, 238, 0.1);
  color: var(--accent-secondary);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

/* ========================================
   Sources List
   ======================================== */

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.source-card {
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.source-card:hover {
  border-color: var(--border-hover);
}

.source-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.source-name {
  font-weight: 600;
  font-size: 1rem;
}

.source-type {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
}

.type-rss {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.type-web {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.source-url {
  font-size: 0.8rem;
  color: var(--text-muted);
  word-break: break-all;
  margin-bottom: 8px;
}

.source-details {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.source-category {
  font-size: 0.8rem;
  color: var(--accent-primary-hover);
}

.source-keywords-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.source-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ========================================
   Settings
   ======================================== */

.settings-panel {
  max-width: 600px;
}

.settings-panel h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.settings-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.status-message {
  margin-top: 12px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  display: none;
}

.status-message.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success);
}

.status-message.error {
  display: block;
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: var(--danger);
}

/* ========================================
   Form Elements
   ======================================== */

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

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.textarea {
  resize: vertical;
  min-height: 80px;
}

.form-hint {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ========================================
   Modal
   ======================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-overlay.active {
  display: flex;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-modal);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

/* ========================================
   Loading & Empty States
   ======================================== */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 0;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 64px 0;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  opacity: 0.5;
}

/* ========================================
   Utility
   ======================================== */

.hidden {
  display: none !important;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 640px) {
  .header-content {
    height: 56px;
  }

  .logo h1 {
    font-size: 1rem;
  }

  .btn-text {
    display: none;
  }

  .feed-controls {
    flex-direction: column;
    gap: 8px;
  }

  .tab-label {
    display: none;
  }

  .tab {
    padding: 12px 14px;
  }

  .article-title {
    font-size: 0.95rem;
  }

  .modal {
    max-height: 85vh;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .app {
    max-width: 700px;
  }
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}