:root {
  /* Neutrals */
  --color-black: 0 0% 0%;
  --color-dark: 0 0% 8%;
  --color-white: 0 0% 100%;

  /* Brand — Orange */
  --color-orange-100: 32 93% 62%; /* #F8A145 */
  --color-orange-500: 30 100% 47%; /* #F07900 */
  --color-orange-700: 24 100% 41%; /* #D35100 */

  /* Typography */
  --font-sans:
    "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-xs: 1.2rem;
  --font-sm: 1.4rem;
  --font-md: 1.6rem;
  --font-lg: 2rem;
  --font-xl: 2.4rem;

  /* Transitions */
  --transition-fast: all 300ms ease-in-out;
  --transition-slow: all 500ms ease-in-out;
}

:root {
  /* Backgrounds */
  --background-primary: hsl(var(--color-white));
  --background-secondary: hsl(0 0% 97%);
  --background-surface: hsl(var(--color-orange-100));

  /* Text */
  --text-primary: hsl(var(--color-dark));
  --text-secondary: hsl(0 0% 27%);
  --text-inverse: hsl(var(--color-white));

  /* Accent */
  --accent-primary: hsl(var(--color-orange-500));
  --accent-hover: hsl(var(--color-orange-700));
  --accent-muted: hsl(var(--color-orange-100));

  /* Border */
  --border-primary: hsl(0 0% 88%);
  --border-accent: hsl(var(--color-orange-500));

  /* Shadows */
  --shadow-light: 0 0.1rem 0.3rem rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 0.4rem 0.6rem rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 1rem 2rem rgba(0, 0, 0, 0.2);

  /* Form */
  --form-placeholder: hsl(0 0% 60%);
}

[data-theme="dark"] {
  --background-primary: hsl(var(--color-black));
  --background-secondary: hsl(var(--color-dark));
  --background-surface: hsl(0 0% 12%);

  --text-primary: hsl(var(--color-white));
  --text-secondary: hsl(0 0% 80%);
  --text-inverse: hsl(var(--color-black));

  --accent-primary: hsl(var(--color-orange-500));
  --accent-hover: hsl(var(--color-orange-100));
  --accent-muted: hsl(var(--color-orange-700));

  --border-primary: hsl(0 0% 16%);
  --border-accent: hsl(var(--color-orange-700));

  --shadow-light: 0 0.1rem 0.3rem rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 0.4rem 0.6rem rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 1rem 2rem rgba(0, 0, 0, 0.2);

  --form-placeholder: hsl(0 0% 40%);
}

html {
  font-size: 62.5%;
  scroll-behavior: smooth;
  scroll-padding-top: 3.2rem;
}

body {
  background-color: var(--background-secondary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-sm);
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.25;
  font-weight: 600;
}

time {
  color: var(--text-secondary);
}

.container {
  max-width: 102.4rem;
  margin-inline: auto;
  padding-inline: 1.6rem;
}

.divider {
  width: 100%;
  height: 0.1rem;
  border: none;
  background-color: var(--border-primary);
  margin-block: 2.4rem;
  color: var(--border-accent);
}

/* ==========================================================
  List
  ========================================================== */
.list-bullet {
  list-style: disc;
  padding-left: 1.6rem;
}

.list-number {
  list-style: decimal;
  padding-left: 1.6rem;
}

.list {
  padding-left: 1.6rem;
}

/* ==========================================================
  Table
  ========================================================== */
.table {
  width: 100%;
}

.table th,
.table td {
  padding: 0.6rem;
}

.table-bordered tr {
  border-bottom: 1px solid var(--border-primary);
}

.table-bordered tr:first-child {
  border-top: 1px solid var(--border-primary);
}

.table-bordered th,
.table-bordered td {
  border-right: 1px solid var(--border-primary);
}

.table-bordered th:first-child,
.table-bordered td:first-child {
  border-left: 1px solid var(--border-primary);
}

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

/* Base Form Label */
.form-label {
  display: block;
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

.form-label-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.form-label-group .form-label {
  margin-bottom: 0;
}

/* Additional Form Info Text */
.form-info {
  color: var(--text-secondary);
  margin-bottom: 1.6rem;
}

/* Base Form Control (input, textarea, select) */
.form-control {
  width: 100%;
  padding: 0.4rem 0.8rem;
  font-size: var(--font-sm);
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--background-primary);
  border: 1px solid var(--border-primary);
  transition: var(--transition-fast);
  box-sizing: border-box;
}

.form-control::placeholder {
  color: var(--form-placeholder);
  opacity: 1;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-muted);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

/* Textarea Specific */
textarea.form-control {
  min-height: 8rem;
  resize: vertical;
}

/* Select Specific */
select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='5'%3E%3Cpath fill='%23000' d='M0 0l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 0.6rem auto;
  padding-right: 2.4rem;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
  cursor: pointer;
  font-size: var(--font-sm);
  color: var(--text-primary);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 1.6rem;
  height: 1.6rem;
  accent-color: var(--accent-primary);
  cursor: pointer;
  flex-shrink: 0;
}

/* Form Group */
.form-group {
  margin-bottom: 1.6rem;
  display: flex;
  flex-direction: column;
}

/* Error / Help Text */
.form-help {
  font-size: var(--font-xs);
  color: var(--accent-hover);
  margin-top: 0.4rem;
}

/* ==========================================================
  Buttons
  ========================================================== */
/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 0.4rem 0.8rem;
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-inverse);
  background-color: var(--accent-primary);
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
  text-decoration: none;
}

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

.btn:disabled {
  background-color: var(--accent-muted);
  cursor: not-allowed;
  opacity: 0.7;
}

/* ==========================================================
  Card
  ========================================================== */
.card {
  background-color: var(--background-primary);
  border: 1px solid var(--border-primary);
  overflow: hidden;
}

.card-body {
  padding: 1.6rem;
}

.card-footer {
  padding: 1.6rem;
  border-top: 1px solid var(--border-primary);
}

/* ==========================================================
  Links
  ========================================================== */
.link {
  color: var(--accent-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.link:hover,
.link.active {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ==========================================================
  Section
  ========================================================== */
.section .container {
  padding-block: 2.4rem;
}

.section-title {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  margin-bottom: 1.6rem;
}

.section-title.lg {
  font-size: var(--font-lg);
}

.section-description {
  margin-bottom: 1rem;
}

/* ==========================================================
  Header
  ========================================================== */
.header-main {
  background-color: var(--background-surface);
}

.header-main .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.8rem;
}

/* ==========================================================
  Brand
  ========================================================== */
.brand-logo {
  font-size: var(--font-sm);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}

.brand-logo .text-accent {
  display: inline-block;
  color: var(--text-inverse);
  background-color: var(--accent-primary);
  padding: 0.2rem 0.4rem;
}

/* ==========================================================
  Navigation
  ========================================================== */
.hamburger-btn {
  flex-shrink: 0;
  padding: 0.4rem 0.6rem;
}

.hamburger-btn svg {
  flex-shrink: 0;
  width: 1.6rem;
  height: 1.6rem;
}

@media only screen and (min-width: 1024px) {
  .hamburger-btn {
    display: none;
  }
}

.header-main .nav {
  flex: 1;
  display: flex;
  justify-content: space-between;
  gap: 1.6rem;
}

.nav ul {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.nav a {
  display: inline-flex;
  color: var(--text-primary);
  padding-inline: 0.2rem;
  transition: var(--transition-fast);
}

.nav a:hover {
  color: var(--accent-hover);
}

/* Active state (optional) */
.nav a[aria-current="page"],
.nav a.active {
  font-weight: 500;
  color: var(--accent-hover);
}

.header-main .nav-left {
  position: fixed;
  inset: 4rem 0 0;
  background-color: var(--background-surface);
  padding: 1.6rem;
  transform: translateX(-100%);
  transition: var(--transition-fast);
  z-index: 100;
  opacity: 0;
}

.header-main .nav-left {
  flex-direction: column;
  align-items: flex-start;
}

.header-main .nav.open .nav-left {
  transform: translateX(0);
  opacity: 1;
}

.header-main .nav-right {
  margin-left: auto;
}

@media only screen and (min-width: 1024px) {
  .header-main .nav-left,
  .header-main .nav.open .nav-left {
    position: static;
    transform: translateX(0);
    opacity: 1;
    background: none;
    padding: 0;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
  }
}

/* =========================================================
  Theme Toggle
  ========================================================== */
.dark-mode-btn {
  display: flex;
  align-items: center;
  padding: 0.4rem;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-sm);
  transition: var(--transition-fast);
}

.dark-mode-btn .icon-sun {
  display: none;
  width: 16px;
  height: 16px;
  transition: opacity 0.3s ease-in-out;
}

.dark-mode-btn .icon-moon {
  display: inline-block;
  width: 16px;
  height: 16px;
  transition: opacity 0.3s ease-in-out;
}

[data-theme="dark"] .dark-mode-btn .icon-sun {
  display: inline-block;
}

[data-theme="dark"] .dark-mode-btn .icon-moon {
  display: none;
}

.dark-mode-btn .icon-sun,
.dark-mode-btn .icon-moon {
  opacity: 1;
}

[data-theme="dark"] .dark-mode-btn .icon-moon,
[data-theme="light"] .dark-mode-btn .icon-sun {
  opacity: 0;
}

/* ==========================================================
  Footer
  ========================================================== */
.footer-main {
  border-top: 1px solid var(--border-accent);
}

.footer-main .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding-block: 3.2rem;
}

.footer-main .nav ul {
  flex-wrap: wrap;
  justify-content: center;
}

/* ==========================================================
  Search Box
  ========================================================== */
.search-box {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.search-box .form-label {
  margin-bottom: 0;
}

.search-box .form-control {
  max-width: 20rem;
}

/* ==========================================================
  Simple Article List
  ========================================================== */
.article-list {
  display: grid;
  gap: 0.8rem;
}

.article-item {
  display: flex;
}

.article {
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.article-rank {
  min-width: 1.6rem;
  flex-shrink: 0;
  text-align: right;
  line-height: 1.125;
}

.article-up {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent-muted);
  flex-shrink: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  transition: var(--transition-fast);
}

.article-up:hover {
  color: var(--accent-primary);
}

.article > div {
  flex: 1;
}

.article-title {
  margin: 0;
  font-size: var(--font-sm);
}

.article-title a {
  text-decoration: none;
  transition: var(--transition-fast);
}

.article-title a:hover {
  text-decoration: underline;
}

.article-title .article-source {
  font-size: var(--font-xs);
  color: var(--text-secondary);
  margin-left: 0.4rem;
}

.article-meta {
  font-size: var(--font-xs);
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.article-meta .link {
  color: var(--accent-primary);
}

.article-meta .link:hover {
  color: var(--accent-hover);
}

/* Responsive adjustments */
@media only screen and (min-width: 1024px) {
  .article-item {
    flex-direction: column;
    gap: 0.4rem;
  }

  .article-rank {
    width: auto;
    text-align: left;
  }
}

/* ==========================================================
   Pagination
   ========================================================== */
.pagination {
  margin: 2rem 0;
}

.pagination-list {
  list-style: none;
  display: inline-flex;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.pagination-item {
}

.pagination-btn {
  background: none;
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  padding: 0.2rem 0.8rem;
  cursor: pointer;
  font-size: var(--font-sm);
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.8rem;
}

.pagination-btn:hover:not(:disabled):not(.active) {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.pagination-btn.active {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
  border-color: var(--accent-primary);
}

.pagination-ellipsis {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  font-size: var(--font-sm);
  color: var(--text-secondary);
}

/* ==========================================================
  Comment Thread
  ========================================================== */
.comment-list {
  display: grid;
  gap: 1rem;
}

/* Individual comment */
.comment-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  color: var(--text-secondary);
}

/* Header line (author, time, links) */
.comment-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--font-xs);
  line-height: 1.4;
}

/* Vote arrow */
.comment-up {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent-muted);
  flex-shrink: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  transition: var(--transition-fast);
}

.comment-up:hover {
  color: var(--accent-primary);
}

/* Author */
.comment-author {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
}

.comment-author:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Time + metadata links */
.comment-time {
  color: var(--text-secondary);
}

.comment-header a {
  color: var(--accent-primary);
  text-decoration: none;
}

.comment-header a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Comment body */
.comment-body {
  font-size: var(--font-sm);
  color: var(--text-primary);
}

.comment-body p:last-child {
  margin-bottom: 0;
}

/* Actions (reply) */
.comment-actions {
  font-size: var(--font-xs);
}

.comment-actions a {
  color: var(--accent-primary);
  text-decoration: none;
}

.comment-actions a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Nested comments */
.comment-children {
  margin-left: 0.8rem;
  padding-left: 0.8rem;
  border-left: 1px solid var(--border-subtle);
  display: grid;
  gap: 1rem;
}

/* Reduce visual weight for deep nesting */
.comment-children .comment-children {
  border-left-color: var(--border-muted);
}

/* Responsive adjustments */
@media only screen and (min-width: 1024px) {
  .comment-body,
  .comment-actions {
    margin-left: 2rem;
  }

  .comment-header {
    flex-wrap: nowrap;
    white-space: nowrap;
  }

  .comment-children {
    margin-left: 1.6rem;
  }
}

/* ==========================================================
  Auth Section
  ========================================================== */
.auth-section .container {
  display: grid;
  place-items: center;
  padding-block: 6.4rem;
}

.auth-form {
  width: 100%;
  max-width: 40rem;
  margin-inline: auto;
  padding: 1.6rem;
  border-radius: 0.4rem;
  box-shadow: var(--shadow-medium);
  background-color: var(--background-primary);
}

.auth-form-header {
  margin-bottom: 1.6rem;
}

.auth-form-title {
  font-size: var(--font-lg);
}

.auth-form-footer {
  margin-top: 1.6rem;
}

/* ==========================================================
Comment Form
========================================================== */
.comment-form {
  margin: 2rem 2rem 4rem 2rem;
}

/* ==========================================================
Generic Content
========================================================== */
.generic-content-list {
  display: grid;
  gap: 2.4rem;
}

.generic-content-title {
  font-size: var(--font-sm);
  margin-bottom: 0.8rem;
}

.generic-content-item p:not(:last-child) {
  margin-bottom: 1rem;
}

.generic-content-item ul {
  margin-top: 0.5rem;
  padding-left: 2.4rem;
  display: grid;
  gap: 0.5rem;
  list-style-type: disc;
}

/* ==========================================================
  Generic Content
  ========================================================== */
.legal-content {
  display: flex;
  flex-direction: column-reverse;
  gap: 2.4rem 6.4rem;
}

@media only screen and (min-width: 1024px) {
  .legal-content {
    align-items: flex-start;
    flex-direction: row;
  }
}

.legal-content-wrapper {
  flex: 1;
  display: grid;
  gap: 5.6rem;
}

.legal-content-title {
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.legal-content-description {
  margin-bottom: 2.4rem;
}

/* ==========================================================
  Table of Contents
  ========================================================== */
.table-of-contents {
  padding: 1.6rem;
  box-shadow: var(--shadow-medium);
  background-color: var(--background-primary);
}

@media only screen and (min-width: 1024px) {
  .table-of-contents {
    flex: 0 0 30rem;
    position: sticky;
    top: 2.4rem;
  }
}

.table-of-contents-title {
  font-size: var(--font-md);
  margin-bottom: 1.6rem;
}

.table-of-contents-list {
  display: grid;
  gap: 0.8rem;
  list-style-type: decimal;
  list-style-position: inside;
}