/* ============================================
   eBook Manager — Component Library
   ============================================ */

@import url('base.css');

/* ══════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
  filter: brightness(1.1);
}

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

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

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: rgba(248, 113, 113, 0.2);
}

.btn-danger:hover {
  background: rgba(248, 113, 113, 0.2);
  border-color: var(--danger);
  box-shadow: 0 0 20px rgba(248, 113, 113, 0.15);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.btn-icon:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

.btn-sm svg {
  width: 14px;
  height: 14px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* ══════════════════════════════════════════════
   FORM INPUTS
   ══════════════════════════════════════════════ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-input, .form-textarea {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.form-input::placeholder, .form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-input:hover, .form-textarea:hover {
  border-color: var(--border-hover);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow), inset 0 2px 4px rgba(0,0,0,0.1);
}

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

.password-wrapper {
  position: relative;
}

.password-wrapper .form-input {
  padding-right: 48px;
}

.password-toggle {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color var(--transition-fast);
  border: none;
}

.password-toggle:hover {
  color: var(--text-primary);
}

.password-toggle svg {
  width: 18px;
  height: 18px;
}

/* input wrapper with leading icon */
.input-icon-wrapper {
  position: relative;
}

.input-icon-wrapper .form-input {
  padding-left: 44px;
}

.input-icon-wrapper .input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  width: 18px;
  height: 18px;
}

/* ══════════════════════════════════════════════
   BOOK CARDS
   ══════════════════════════════════════════════ */

.book-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.book-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--accent-gradient);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), 0 10px 30px var(--accent-glow);
  background: var(--bg-tertiary);
}

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

.book-card__cover {
  aspect-ratio: 2 / 3;
  width: 100%;
  object-fit: cover;
  display: block;
}

.book-card__cover-placeholder {
  aspect-ratio: 2 / 3;
  width: 100%;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, #252540 50%, var(--bg-tertiary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  user-select: none;
}

.book-card__body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.book-card__title {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card__author {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

.book-card__topic {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  font-style: italic;
}

.book-card__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.book-card__notes {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-style: italic;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.book-card__actions {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
  margin-top: auto;
  padding-top: 8px;
}

/* ══════════════════════════════════════════════
   BADGES
   ══════════════════════════════════════════════ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.6875rem;
  font-weight: 500;
  white-space: nowrap;
}

.badge-owned {
  background: var(--success-bg);
  color: var(--success);
}

.badge-read {
  background: var(--info-bg);
  color: var(--info);
}

.badge-awaiting {
  background: var(--warning-bg);
  color: var(--warning);
}

/* ══════════════════════════════════════════════
   MODAL
   ══════════════════════════════════════════════ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.modal__header h2 {
  font-size: 1.125rem;
}

.modal__body {
  padding: 24px;
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
}

/* ══════════════════════════════════════════════
   HEADER / NAVBAR
   ══════════════════════════════════════════════ */

.header {
  background: rgba(21, 21, 32, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 24px;
}

.header__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
}

.header__logo {
  color: var(--accent);
  font-weight: 700;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

.header__logo-emoji {
  font-size: 1.4rem;
}

.header__search {
  flex: 1;
  max-width: 480px;
  position: relative;
}

.header__search .form-input {
  padding-left: 44px;
  border-radius: var(--radius-xl);
  background: var(--bg-glass);
  font-size: 0.875rem;
  height: 42px;
}

.header__search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  width: 18px;
  height: 18px;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* User menu dropdown */
.user-menu {
  position: relative;
}

.user-menu__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  min-width: 200px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-normal);
  z-index: 200;
  overflow: hidden;
}

.user-menu__dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-menu__item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.user-menu__item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.user-menu__item:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.user-menu__divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 4px 0;
}

/* ══════════════════════════════════════════════
   FILTERS
   ══════════════════════════════════════════════ */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.filter-chip {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 500;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.filter-chip:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.filter-chip.active {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}

/* ══════════════════════════════════════════════
   TOGGLE / SWITCH
   ══════════════════════════════════════════════ */

.toggle-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.toggle-group__label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle__slider {
  position: absolute;
  inset: 0;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.toggle__slider::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--transition-normal);
}

.toggle input:checked + .toggle__slider {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle input:checked + .toggle__slider::before {
  transform: translateY(-50%) translateX(20px);
  background: var(--bg-primary);
}

.toggle input:focus-visible + .toggle__slider {
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ══════════════════════════════════════════════
   TOAST / NOTIFICATIONS
   ══════════════════════════════════════════════ */

.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-primary);
  pointer-events: auto;
  animation: toastSlideIn var(--transition-slow) forwards;
  border-left: 3px solid var(--text-secondary);
  max-width: 380px;
}

.toast.removing {
  animation: toastSlideOut var(--transition-normal) forwards;
}

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

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

.toast-info {
  border-left-color: var(--info);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toastSlideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(40px);
  }
}

/* ══════════════════════════════════════════════
   EMPTY STATE
   ══════════════════════════════════════════════ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
  gap: 16px;
}

.empty-state__icon {
  font-size: 4rem;
  opacity: 0.5;
}

.empty-state__title {
  color: var(--text-secondary);
  font-size: 1.125rem;
  font-weight: 500;
}

.empty-state__description {
  color: var(--text-tertiary);
  font-size: 0.875rem;
  max-width: 320px;
}

/* ══════════════════════════════════════════════
   UPLOAD AREA
   ══════════════════════════════════════════════ */

.upload-area {
  border: 2px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 32px 24px;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  min-height: 140px;
}

.upload-area:hover {
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
}

.upload-area.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.upload-area__icon {
  width: 36px;
  height: 36px;
  color: var(--text-tertiary);
}

.upload-area__text {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.upload-area__hint {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.upload-preview {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
}

.upload-preview img {
  width: 100%;
  max-height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.upload-preview__remove {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  cursor: pointer;
  border: none;
  transition: background var(--transition-fast);
}

.upload-preview__remove:hover {
  background: var(--danger);
}

.upload-preview__remove svg {
  width: 14px;
  height: 14px;
}

/* ══════════════════════════════════════════════
   BOOKS GRID
   ══════════════════════════════════════════════ */

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  padding: 0 24px 40px;
  max-width: 1400px;
  margin: 0 auto;
}

/* ══════════════════════════════════════════════
   LOADING
   ══════════════════════════════════════════════ */

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

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

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-glass) 25%,
    var(--bg-glass-hover) 50%,
    var(--bg-glass) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ══════════════════════════════════════════════
   LOGIN PAGE SPECIFICS
   ══════════════════════════════════════════════ */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
    var(--bg-primary);
  padding: 20px;
  overflow: hidden;
  position: relative;
}

.login-card {
  background: rgba(24, 24, 27, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  position: relative;
  z-index: 1;
}

.login-card__logo {
  text-align: center;
  margin-bottom: 8px;
  font-size: 3.5rem;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.5));
}

.login-card__title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.login-card__subtitle {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.9375rem;
  margin-bottom: 36px;
}

.login-error {
  background: var(--danger-bg);
  border: 1px solid rgba(248, 113, 113, 0.2);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--danger);
  font-size: 0.8125rem;
  margin-bottom: 16px;
  display: none;
  align-items: center;
  gap: 8px;
}

.login-error.visible {
  display: flex;
}

/* Floating shapes animation */
.login-bg-shapes {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.login-bg-shapes span {
  position: absolute;
  display: block;
  border-radius: 50%;
  background: var(--accent-gradient);
  filter: blur(60px);
  opacity: 0;
  animation: floatShape 20s ease-in-out infinite alternate;
}

.login-bg-shapes span:nth-child(1) {
  width: 250px; height: 250px;
  left: -5%; top: 20%; animation-delay: 0s; animation-duration: 25s;
}
.login-bg-shapes span:nth-child(2) {
  width: 180px; height: 180px;
  right: -5%; bottom: 10%; animation-delay: 2s; animation-duration: 22s;
}
.login-bg-shapes span:nth-child(3) {
  width: 300px; height: 300px;
  left: 40%; top: -10%; animation-delay: 4s; animation-duration: 28s; opacity: 0.3;
}
.login-bg-shapes span:nth-child(4) { display: none; }
.login-bg-shapes span:nth-child(5) { display: none; }
.login-bg-shapes span:nth-child(6) { display: none; }

@keyframes floatShape {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.15;
  }
  50% {
    opacity: 0.3;
  }
  100% {
    transform: translate(60px, 80px) scale(1.1);
    opacity: 0.15;
  }
}

/* Shake animation for errors */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 50%, 90% { transform: translateX(-4px); }
  30%, 70% { transform: translateX(4px); }
}

.shake {
  animation: shake 0.5s ease;
}

/* ══════════════════════════════════════════════
   CARD ENTER ANIMATION
   ══════════════════════════════════════════════ */

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

.book-card {
  animation: cardFadeIn var(--transition-slow) both;
}

.book-card:nth-child(1) { animation-delay: 0ms; }
.book-card:nth-child(2) { animation-delay: 50ms; }
.book-card:nth-child(3) { animation-delay: 100ms; }
.book-card:nth-child(4) { animation-delay: 150ms; }
.book-card:nth-child(5) { animation-delay: 200ms; }
.book-card:nth-child(6) { animation-delay: 250ms; }
.book-card:nth-child(7) { animation-delay: 300ms; }
.book-card:nth-child(8) { animation-delay: 350ms; }
.book-card:nth-child(n+9) { animation-delay: 400ms; }