/* ========================================
   Slide Stock — Global CSS
   ui-spec.md セクション 8
   ======================================== */

/* --- Design Tokens --- */
:root {
  --color-primary: #1a73e8;
  --color-primary-hover: #1557b0;
  --color-text: #202124;
  --color-text-secondary: #5f6368;
  --color-background: #ffffff;
  --color-surface: #f8f9fa;
  --color-border: #dadce0;
  --color-error: #d93025;
  --color-success: #188038;
  --color-warning: #f9ab00;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --line-height-base: 1.6;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  --max-width: 960px;
  --border-radius: 8px;
  --border-radius-sm: 4px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* --- Layout --- */
main {
  padding: var(--space-lg) var(--space-md);
}

footer {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- Navbar --- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.navbar-brand {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.navbar-brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

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

.navbar-user {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
  color: #fff;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-secondary:hover {
  background: rgba(26, 115, 232, 0.04);
}

.btn-secondary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  color: var(--color-error);
  border: 1px solid var(--color-error);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-danger:hover {
  background: var(--color-error);
  color: #fff;
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: 0;
  text-decoration: none;
}

.btn-text:hover {
  text-decoration: underline;
}

.btn-google-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xl);
  background: var(--color-background);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: box-shadow 0.15s;
}

.btn-google-login:hover {
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-text);
}

.btn-logout {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
}

.btn-logout:hover {
  color: var(--color-text);
  text-decoration: underline;
}

/* --- URL Input Form --- */
.url-input-form {
  margin-bottom: var(--space-xl);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.input-url {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  outline: none;
  transition: border-color 0.15s;
}

.input-url:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

.error-message {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--space-xs);
}

/* --- Stock Card --- */
.stock-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: box-shadow 0.2s;
}

.stock-card:hover {
  box-shadow: var(--shadow-md);
}

.stock-card + .stock-card {
  margin-top: var(--space-md);
}

.stock-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.stock-card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: 1.4;
}

.stock-card-title a {
  color: var(--color-text);
}

.stock-card-title a:hover {
  color: var(--color-primary);
}

.stock-card-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.stock-card-memo {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.stock-card-actions {
  display: flex;
  gap: var(--space-md);
}

.stock-card-pending {
  color: var(--color-text-secondary);
  font-style: italic;
}

.stock-card-failed {
  color: var(--color-error);
}

/* --- Badge --- */
.badge {
  display: inline-block;
  padding: 2px var(--space-sm);
  border-radius: var(--border-radius-sm);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  color: #fff;
}

.badge-speakerdeck { background: #4CAF50; }
.badge-docswell { background: #2196F3; }
.badge-google_slides { background: #FFC107; color: #333; }

/* --- Stock List --- */
.stock-list {
  min-height: 200px;
}

.loading-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-2xl);
}
.loading-container[hidden] {
  display: none;
}

.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-secondary);
}

.empty-state p + p {
  margin-top: var(--space-sm);
}

.empty-state-heading {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.empty-state-providers {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
  flex-wrap: wrap;
}

.empty-state-provider-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius);
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s, box-shadow 0.15s;
}

.empty-state-provider-link:hover {
  opacity: 0.85;
  box-shadow: var(--shadow-md);
}

.empty-state-action {
  margin-top: var(--space-lg);
  font-size: var(--font-size-base);
  color: var(--color-text);
  font-weight: 500;
}

#load-more-container {
  text-align: center;
  padding: var(--space-lg) 0;
}

/* --- Loading Spinner --- */
.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Embed Viewer --- */
.embed-viewer {
  margin: var(--space-lg) 0;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: #000;
}

.embed-iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  display: block;
}

.embed-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* --- Memo Editor --- */
.memo-editor {
  margin: var(--space-xl) 0;
}

.memo-editor-heading {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.memo-textarea {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  line-height: var(--line-height-base);
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

.memo-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

.memo-editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-sm);
}

.char-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.char-count.warning { color: var(--color-warning); }
.char-count.error { color: var(--color-error); }

.memo-editor-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.memo-status {
  font-size: var(--font-size-sm);
}

.memo-status.success { color: var(--color-success); }
.memo-status.error { color: var(--color-error); }

/* --- Danger Zone --- */
.danger-zone {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* --- Error Page --- */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 60vh;
  padding: var(--space-xl);
}

.error-page-code {
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.error-page h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.error-page p:not(.error-page-code) {
  color: var(--color-text-secondary);
  max-width: 480px;
  margin-bottom: var(--space-lg);
}

/* --- Landing / Login --- */
.landing,
.login-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 60vh;
  padding: var(--space-xl);
}

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

.landing h1,
.login-container h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.landing p,
.login-container p {
  color: var(--color-text-secondary);
  max-width: 480px;
  margin-bottom: var(--space-lg);
}

/* --- Detail Page --- */
.detail-header {
  margin-bottom: var(--space-lg);
}

.detail-title {
  font-size: var(--font-size-xl);
  margin: var(--space-md) 0 var(--space-sm);
}

.detail-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.detail-link {
  margin: var(--space-md) 0;
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
}

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

/* --- Hero --- */
.hero {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.hero-description {
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto var(--space-xl);
  font-size: var(--font-size-lg);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

/* --- Providers --- */
.providers {
  padding: var(--space-2xl) var(--space-md);
}

.section-title {
  text-align: center;
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xl);
}

.provider-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.provider-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  text-align: center;
}

.provider-card .badge {
  margin-bottom: var(--space-md);
}

.provider-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --- How It Works --- */
.how-it-works {
  padding: var(--space-2xl) var(--space-md);
  background: var(--color-background);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.step h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.step p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --- Responsive --- */
@media (min-width: 640px) {
  .input-group {
    flex-direction: row;
  }

  .input-url {
    flex: 1;
  }
}

@media (min-width: 960px) {
  main {
    max-width: var(--max-width);
    margin-inline: auto;
  }

  .navbar {
    padding-left: calc((100% - var(--max-width)) / 2 + var(--space-lg));
    padding-right: calc((100% - var(--max-width)) / 2 + var(--space-lg));
  }
}