/* ==========================================================================
   Font Definitions
   ========================================================================== */

@font-face {
  font-family: "Outline";
  src: url("../fonts/Outline-Regular.woff2") format("woff2"),
    url("../fonts/Outline-Regular.woff") format("woff");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Outline";
  src: url("../fonts/Outline-Light.woff2") format("woff2"),
    url("../fonts/Outline-Light.woff") format("woff");
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

/* ==========================================================================
   CSS Reset & Normalize (Modern Best Practices)
   Based on normalize.css v8.0.1 + modern resets
   ========================================================================== */

/* Box sizing rules */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Prevent font size inflation */
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
}

/* Remove default margin and padding */
* {
  margin: 0;
  padding: 0;
}

/* Set core root defaults */
html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Set core body defaults */
body {
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.5;
  text-rendering: optimizeSpeed;
}

/* Remove list styles on ul, ol elements */
ul,
ol {
  list-style: none;
}

/* Anchor elements that don't have a class get default styles */
a:not([class]) {
  text-decoration-skip-ink: auto;
}

/* Make images easier to work with */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* Remove default button styles */
button {
  background: none;
  border: none;
  cursor: pointer;
}

/* Make sure textareas without a rows attribute are not tiny */
textarea:not([rows]) {
  min-height: 10em;
}

/* Anything that has been anchored to should have extra scroll margin */
:target {
  scroll-margin-block: 5ex;
}

/* Remove all animations, transitions and smooth scroll for people that prefer not to see them */
@media (prefers-reduced-motion: reduce) {
  html:focus-within {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Remove the inner border and padding in Firefox */
::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

/* Restore the focus styles unset by the previous rule */
:-moz-focusring {
  outline: 1px dotted ButtonText;
}

/* Remove the additional ':invalid' styles in Firefox */
:-moz-ui-invalid {
  box-shadow: none;
}

/* Correct the cursor style of increment and decrement buttons in Safari */
::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}

/* Correct the outline style in Safari */
[type="search"] {
  outline-offset: -2px;
}

/* Remove the inner padding in Chrome and Safari on macOS */
::-webkit-search-decoration {
  -webkit-appearance: none;
}

/* Correct the inability to style clickable types in iOS and Safari */
::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}

/* Interactive elements */
summary {
  display: list-item;
}

/* Table */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-accent: #f59e0b;

  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-inverse: #ffffff;

  --color-background: #ffffff;
  --color-background-secondary: #f8fafc;
  --color-background-tertiary: #f1f5f9;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --color-push-box-bg: #EBEEF4;

  --color-success: #22c55e;
  --color-error: #ef4444;
  --color-warning: #f59e0b;

  /* Typography */
  --font-family-base: "Outline", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue",
    sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-family-outfit: "Outfit", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, sans-serif;

  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5; /* 24px at 16px base */
  --line-height-relaxed: 1.75;
  --line-height-24: 24px;

  /* Spacing */
  --spacing-xs: 0.25rem; /* 4px */
  --spacing-sm: 0.5rem; /* 8px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 1.5rem; /* 24px */
  --spacing-xl: 2rem; /* 32px */
  --spacing-2xl: 3rem; /* 48px */

  /* Border Radius */
  --radius-sm: 0.25rem; /* 4px */
  --radius-md: 0.5rem; /* 8px */
  --radius-lg: 0.75rem; /* 12px */
  --radius-xl: 1rem; /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1),
    0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --mobile-max-width: 430px;
  --header-height: auto;
  --footer-height: auto;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-background-secondary);
}

/* ==========================================================================
   Top Bar Slotted Content Styles
   ========================================================================== */

top-bar .icon-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

top-bar .icon-button svg {
  width: 32px;
  height: 32px;
}

top-bar .logo {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: #ffffff;
  text-decoration: none;
}

top-bar .actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* ==========================================================================
   Mobile Container (for desktop viewing)
   Centers content in a phone-sized container on larger screens
   ========================================================================== */

.mobile-container {
  width: 100%;
  min-height: 100vh;
  margin: 0 auto;
  background-color: var(--color-background);
  position: relative;
}

@media (min-width: 431px) {
  body {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: var(--spacing-lg) 0;
  }

  .mobile-container {
    max-width: var(--mobile-max-width);
    min-height: calc(100vh - var(--spacing-lg) * 2);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
  }
}

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

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

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.truncate-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   Page Components
   ========================================================================== */

/* Section */
.section {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.section-heading {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

/* Book Grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

/* ==========================================================================
   Book Detail Page
   ========================================================================== */

.book-detail {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--color-primary);
}

/* Book Cover */
.book-cover {
  display: flex;
  justify-content: center;
}

.book-cover-placeholder {
  width: 180px;
  height: 270px;
  background-color: var(--color-background-tertiary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  box-shadow: var(--shadow-md);
}

.book-cover-placeholder svg {
  width: 64px;
  height: 64px;
  opacity: 0.5;
}

.book-cover img {
  width: 180px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Book Info */
.book-info {
  text-align: center;
}

.book-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
  line-height: var(--line-height-tight);
}

.book-author {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.book-rating {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.book-rating .stars {
  display: flex;
  gap: 2px;
}

.book-rating .stars svg {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
}

.rating-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.book-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-background-tertiary);
  border-radius: var(--radius-lg);
}

.meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.meta-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-value {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

/* Purchase Section */
.purchase-section {
  padding: var(--spacing-md);
  background-color: var(--color-background-secondary);
  border-radius: var(--radius-lg);
}

.price-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.current-price {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.original-price {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  text-decoration: line-through;
}

.discount-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-inverse);
  background-color: var(--color-success);
  border-radius: var(--radius-sm);
}

.purchase-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  flex: 1;
  color: var(--color-text-inverse);
  background-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
}

.btn-secondary {
  padding: var(--spacing-sm);
  color: var(--color-text);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-background-tertiary);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
}

.btn-full {
  width: 100%;
}

/* Book Description */
.book-description p {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.book-description p:last-child {
  margin-bottom: 0;
}

/* Reviews Section */
.reviews-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.review-card {
  padding: var(--spacing-md);
  background-color: var(--color-background-secondary);
  border-radius: var(--radius-lg);
}

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

.reviewer-info {
  display: flex;
  flex-direction: column;
}

.reviewer-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.review-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.review-stars {
  display: flex;
  gap: 2px;
}

.review-stars svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
}

.review-text {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: var(--line-height-normal);
}