/**
 * Template Name: CH7S
 * Template URL: https://ch7.co/
 * Updated: February 15 2026
 * Author: CH7.co
 * License: https://ch7.co/license.html
 */

/* ==========================================
   CH7.co - Main Stylesheet
   Modern, Beginner-Friendly Website
   ========================================== */

/* Tailwind CDN is loaded via HTML <script> tag */

/* ==========================================
   CSS Custom Properties (Design Tokens)
   ========================================== */
:root {
  /* Colors */
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;

  /* Light Mode */
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F9FAFB;
  --color-bg-tertiary: #F3F4F6;
  --color-text: #1F2937;
  --color-text-secondary: #4B5563;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;

  /* Semantic */
  --color-success: #10B981;
  --color-error: #EF4444;
  --color-warning: #F59E0B;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;

  /* 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);
}

/* Dark Mode */
.dark {
  --color-bg: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-bg-tertiary: #334155;
  --color-text: #F9FAFB;
  --color-text-secondary: #D1D5DB;
  --color-text-muted: #9CA3AF;
  --color-border: #374151;
}

/* ==========================================
   Base Styles
   ========================================== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color var(--transition-base), color var(--transition-base);
  line-height: 1.6;
}

/* ==========================================
   Typography
   ========================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

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

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

/* Navigation */
.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 0.5rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

/* Cards */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Affiliate CTA Box */
.affiliate-cta {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  border: 2px solid var(--color-primary);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.affiliate-link {
  color: var(--color-primary);
  font-weight: 600;
}

/* Form Elements */
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.form-error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
}

.mobile-menu.active {
  display: block;
}

/* Theme Toggle */
.theme-toggle {
  padding: 0.5rem;
  border-radius: 0.5rem;
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-secondary);
}

/* ==========================================
   Utility Classes
   ========================================== */
.bg-primary {
  background-color: var(--color-bg);
}

.bg-secondary {
  background-color: var(--color-bg-secondary);
}

.bg-tertiary {
  background-color: var(--color-bg-tertiary);
}

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

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

.text-muted {
  color: var(--color-text-muted);
}

.text-accent {
  color: var(--color-primary);
}

.border-color {
  border-color: var(--color-border);
}

/* Container */
.container-custom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container-custom {
    padding: 0 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container-custom {
    padding: 0 2rem;
  }
}

/* Section Spacing */
.section-padding {
  padding: 4rem 0;
}

@media (min-width: 768px) {
  .section-padding {
    padding: 6rem 0;
  }
}

/* ==========================================
   Article Styles
   ========================================== */
.article-content h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.article-content h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.article-content p {
  margin-bottom: 1rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Table of Contents */
.toc {
  background-color: var(--color-bg-secondary);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.toc-link {
  display: block;
  padding: 0.25rem 0;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

/* ==========================================
   Footer Styles
   ========================================== */
.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-link {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

/* ==========================================
   Accordion FAQ
   ========================================== */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.accordion-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.accordion-item:hover {
  box-shadow: var(--shadow-sm);
}

.accordion-item.active {
  border-color: var(--color-primary);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.accordion-trigger:hover {
  background-color: var(--color-bg-secondary);
}

.accordion-icon {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.accordion-body {
  padding: 0 1.25rem 1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================
   Back to Top Button
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {

  .no-print,
  .back-to-top {
    display: none !important;
  }
}