:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1f2937;
  --color-subtext: #6b7280;
  --color-title: #111827;
  --color-icon: #3b82f6;
  --color-border: #d1d5db;
  --color-primary: #2563eb;
  --color-hover: #1d4ed8;
  --color-secondary: #60a5fa;
  --color-footer-bg: #f1f5f9;
  --color-footer-text: #1f2937;
  --color-error: #dc2626;
  --shadow-footer: 0 -2px 8px rgba(0, 0, 0, 0.1);
  --shadow-header: 0 2px 8px rgba(0, 0, 0, 0.1);
  --btn-bg: var(--color-primary);
  --btn-hover-bg: var(--color-hover);
  --btn-color: #ffffff;
  --btn-hover-color: #e0e7ff;
  --toast-bg: rgba(255, 255, 255, 0.85);
}

body.dark-theme {
  --color-bg: #121212;
  --color-surface: #1e1e1e;
  --color-text: #e0e0e0;
  --color-subtext: #a0a0a0;
  --color-title: #ffffff;
  --color-icon: #f1f1f1;
  --color-border: #2a2a2a;
  --color-primary: #3b82f6;
  --color-hover: #60a5fa;
  --color-secondary: #93c5fd;
  --color-footer-bg: #1a1a1a;
  --color-footer-text: #f1f1f1;
  --color-error: #ef4444;
  --shadow-footer: 0 -2px 8px rgba(0, 0, 0, 0.4);
  --shadow-header: 0 2px 8px rgba(0, 0, 0, 0.4);
  --btn-bg: var(--color-primary);
  --btn-hover-bg: var(--color-hover);
  --btn-color: #fff;
  --btn-hover-color: #e2e8f0;
  --toast-bg: rgba(30, 30, 30, 0.8);
}

* {
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: "Segoe UI", sans-serif;
}

h1,
h2,
h3,
h4 {
  color: var(--color-title);
}

.subtitle {
  font-weight: 400;
  margin-bottom: 0;
}

p.edition-p {
  font-size: 0.75rem;
  margin-bottom: 0;
}

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

a:hover {
  color: var(--color-hover);
}

i,
.icon {
  color: var(--color-icon);
  cursor: pointer;
}

.border {
  border: 1px solid var(--color-border);
}

.span-error,
.form-error-message {
  color: var(--color-error);
  font-size: var(--font-error-size);
  font-weight: var(--font-error-weight);
}

.span-error {
  font-size: 1rem;
}

.form-error-message {
  margin-top: var(--error-margin-top);
  display: block;
  transition: opacity 0.2s ease;
}

.form-error-input {
  border-color: var(--color-error);
}

/* BUTTON */
.app-btn {
  display: inline-block;
  font-weight: 500;
  font-size: var(--btn-font-size);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  padding: var(--btn-padding);
  color: var(--btn-color);
  background-color: var(--btn-bg);
  border: none;
  border-radius: var(--btn-border-radius);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.app-btn:hover,
.app-btn:focus {
  background-color: var(--btn-hover-bg);
  color: var(--btn-hover-color);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.app-btn:active {
  transform: scale(0.98);
}

/* LOADER */

.app-loader-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
}

.app-loader {
  background-color: var(--color-bg);
  padding: 2rem;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 4px 10px var(--color-text);
  max-width: 80%;
  text-align: center;
}

.app-loader-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-secondary);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.app-loader-message {
  font-size: 1rem;
  color: var(--color-text);
}

/* TOAST */
.app-toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  width: 300px;
}

.app-toast {
  background-color: var(--toast-bg);
  backdrop-filter: blur(0.125rem);
  -webkit-backdrop-filter: blur(0.125rem);
  padding: 0rem 1rem 0rem 0.75rem;
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px var(--color-text);
  max-height: 200px;
  overflow-y: auto;
  overflow-x: hidden;
  word-wrap: break-word;
  line-height: 1.4;
  font-size: 0.95rem;
  min-width: 280px;
  max-width: 100%;
  position: relative;
  animation: fadeIn 0.3s ease-in-out;
}

.app-toast-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: transparent;
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
  color: var(--toast-header-color);
}

.app-toast-header .app-icon {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  margin-right: 0.5rem;
  flex-shrink: 0;
}

.app-toast-body {
  padding: 1rem;
  font-size: 0.95rem;
  line-height: 1.4;
  max-height: 200px;
  overflow-y: auto;
  overflow-x: hidden;
  word-wrap: break-word;
}

.app-toast-success .app-icon {
  background-color: var(--color-success);
}

.app-toast-warning .app-icon {
  background-color: var(--color-warning);
}

.app-toast-error .app-icon {
  background-color: var(--color-error);
}

.app-toast .app-close-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #6c757d;
  cursor: pointer;
  margin-left: 0.5rem;
}

.app-toast-body::-webkit-scrollbar {
  width: 6px;
}

.app-toast-body::-webkit-scrollbar-thumb {
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 3px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
}

header {
  background-color: var(--color-primary);
  color: var(--btn-color);
  padding: 1rem 2rem;
  box-shadow: var(--shadow-header);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

nav h1 {
  margin: 0;
  font-size: 1.5rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 0;
  margin: 0;
}

nav a {
  color: var(--btn-color);
  text-decoration: none;
  font-weight: 500;
}

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

main {
  padding: 2rem;
}

section {
  margin-bottom: 3rem;
}

#hero {
  text-align: center;
  background-color: var(--color-surface);
  padding: 3rem 1rem;
  border-radius: 12px;
  box-shadow: 0 2px 8px var(--color-border);
}

h2 {
  color: var(--color-title);
  margin-bottom: 0.5rem;
}

article {
  background-color: var(--color-surface);
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 2px 4px var(--color-border);
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 500px;
}

input,
textarea {
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--color-surface);
  color: var(--color-text);
}

button {
  background-color: var(--btn-bg);
  color: var(--btn-color);
  padding: 0.75rem;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: var(--btn-hover-bg);
  color: var(--btn-hover-color);
}

footer {
  text-align: center;
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 1rem;
  font-size: 0.9rem;
  box-shadow: var(--shadow-footer);
}

@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
    align-items: flex-start;
  }
}