/* ============================================
   RESPONSIVE STYLESHEET - Mobile-First Design
   ============================================ */

/* ============================================
   TABLET: 768px - 1024px
   ============================================ */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero p {
    font-size: 1.1rem;
  }

  .spinner-card {
    padding: 1.5rem;
  }

  .section-title h2 {
    font-size: 1.75rem;
  }

  .comparison-grid {
    gap: 1rem;
  }

  .content-page {
    padding: 5rem 0 3rem;
  }
}

/* ============================================
   TABLET PORTRAIT: max-width 768px
   ============================================ */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .topbar-inner {
    padding: 0 1rem;
  }

  .topbar-donate {
    gap: 0.5rem;
  }

  .topbar-donate-link {
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
  }

  .topbar-social {
    gap: 0.3rem;
  }

  .topbar-social-link {
    width: 20px;
    height: 20px;
    font-size: 0.6rem;
  }

  .topbar-share-label {
    display: none;
  }

  /* Header & Navigation */
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu {
    display: block;
    position: fixed;
    top: 100px;
    left: 0;
    right: 0;
    bottom: 0;
    background: #ffffff;
    padding: 1rem 1.5rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    overflow-y: auto;
  }

  .mobile-menu.active {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-nav-links {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
  }

  .mobile-nav-links li {
    border-bottom: 1px solid #f3f4f6;
  }

  .mobile-nav-links .nav-link {
    width: 100%;
    padding: 0.85rem 0;
    display: block;
  }

  .mobile-nav-links .nav-link::after {
    display: none;
  }

  .mobile-lang-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .lang-switch-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: background 0.2s ease;
    font-size: 0.95rem;
  }

  .lang-switch-btn:hover,
  .lang-switch-btn.active {
    background: #eff6ff;
    color: #2563eb;
  }

  .language-selector {
    width: 100%;
  }

  .language-selector-btn {
    width: 100%;
    justify-content: space-between;
  }

  .language-dropdown {
    position: static;
    box-shadow: none;
    border: 1px solid #e5e7eb;
    margin-top: 0.5rem;
    transform: none;
    opacity: 1;
    visibility: visible;
    display: none;
  }

  .language-selector.open .language-dropdown {
    display: block;
  }

  /* Hero */
  .hero {
    padding: 6.5rem 1rem 3rem;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .hero p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  /* Spinner Area */
  .spinner-card {
    padding: 1.25rem;
    margin: 0 0.5rem;
  }

  .spinner-grid {
    grid-template-columns: 1fr;
  }

  .spinner-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .mode-selector {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .mode-selector::-webkit-scrollbar {
    display: none;
  }

  .mode-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    white-space: nowrap;
  }

  .spinner-column textarea {
    min-height: 200px;
    font-size: 0.95rem;
  }

  .spin-btn {
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 1rem;
  }

  .result-box {
    min-height: 160px;
  }

  .counters {
    gap: 1rem;
  }

  /* Features Grid */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .feature-card {
    padding: 1.5rem 1.25rem;
  }

  /* Tips Grid */
  .tips-grid {
    grid-template-columns: 1fr;
  }

  /* Comparison Grid */
  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .comparison-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  /* Compare Section */
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .compare-column {
    padding: 1rem;
  }

  /* Contact Grid */
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .contact-info {
    order: -1;
  }

  /* About Card */
  .about-card {
    padding: 1.5rem;
  }

  /* Policy */
  .policy-card {
    padding: 1.5rem;
  }

  .policy-intro {
    padding: 1.25rem;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .footer-brand .logo {
    justify-content: center;
  }

  .social-icons {
    justify-content: center;
  }

  .footer-links {
    align-items: center;
  }

  .footer-bottom {
    padding: 1.25rem 1rem;
  }

  /* Cards */
  .card {
    padding: 1.25rem;
  }

  /* Contact Form */
  .contact-form {
    padding: 1.25rem;
  }

  /* Cookie Consent */
  .cookie-consent-content {
    flex-direction: column;
    text-align: center;
  }

  .cookie-consent-text {
    min-width: auto;
  }

  .cookie-consent-actions {
    width: 100%;
    justify-content: center;
  }

  /* Donate Section */
  .donate-card {
    padding: 1.75rem;
  }

  .donate-buttons {
    flex-direction: column;
    align-items: center;
  }

  .paypal-btn,
  .coffee-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* Content Pages */
  .content-page {
    padding: 5rem 1rem 3rem;
  }

  .content-section h2 {
    font-size: 1.35rem;
  }

  .content-section h3 {
    font-size: 1.15rem;
  }

  /* Breadcrumbs */
  .breadcrumbs {
    font-size: 0.85rem;
  }

  /* Tables */
  .table-container {
    margin: 1rem -0.5rem;
    border-radius: 8px;
  }

  table {
    font-size: 0.85rem;
  }

  th, td {
    padding: 0.65rem 0.75rem;
  }

  /* Copy Toast */
  .copy-toast {
    left: 1rem;
    right: 1rem;
    top: auto;
    bottom: 5rem;
    transform: translateY(100%);
    justify-content: center;
  }

  .copy-toast.show {
    transform: translateY(0);
  }

  /* Back to Top */
  .back-to-top {
    width: 42px;
    height: 42px;
    bottom: 1.25rem;
    right: 1.25rem;
    font-size: 1.1rem;
  }

  /* Ad Containers */
  .ad-container {
    margin: 1.5rem 0;
  }

  .ad-sidebar {
    position: static;
  }

  .ad-placeholder {
    min-height: 100px;
    padding: 2rem 1rem;
  }

  /* Section Padding */
  .features-section,
  .tips-section,
  .contact-section,
  .donate-section {
    padding: 2.5rem 0;
  }

  .section-title {
    margin-bottom: 2rem;
  }

  /* Tabs */
  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .tabs::-webkit-scrollbar {
    display: none;
  }

  .tab-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    white-space: nowrap;
  }

  /* Social Share */
  .social-share {
    justify-content: center;
  }

  /* Spinner Overlay */
  .loading-spinner-lg {
    width: 48px;
    height: 48px;
    border-width: 4px;
  }

  /* Utilities */
  .hide-mobile {
    display: none !important;
  }

  .show-mobile {
    display: block !important;
  }
}

/* ============================================
   MOBILE: max-width 480px
   ============================================ */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 1rem;
  }

  /* Header */
  .nav {
    padding: 0 1rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  .logo-icon {
    width: 28px;
    height: 28px;
    font-size: 1rem;
  }

  /* Hero */
  .hero {
    padding: 6rem 1rem 2rem;
  }

  .hero h1 {
    font-size: 1.6rem;
    line-height: 1.25;
  }

  .hero p {
    font-size: 0.9rem;
  }

  /* Spinner */
  .spinner-card {
    padding: 1rem;
    margin: 0;
    border-radius: 12px;
  }

  .spinner-title {
    font-size: 1.25rem;
  }

  .mode-btn {
    padding: 0.45rem 0.85rem;
    font-size: 0.8rem;
  }

  .spinner-column textarea {
    min-height: 180px;
    padding: 1rem;
    font-size: 0.9rem;
  }

  .spin-btn {
    padding: 0.85rem 1.25rem;
    font-size: 0.95rem;
    border-radius: 10px;
  }

  .result-box {
    min-height: 140px;
    padding: 1rem;
    font-size: 0.9rem;
  }

  .counters {
    flex-direction: column;
    gap: 0.5rem;
  }

  /* Cards */
  .card {
    padding: 1rem;
    border-radius: 12px;
  }

  /* Feature Cards */
  .feature-card {
    padding: 1.25rem 1rem;
  }

  .feature-icon {
    width: 52px;
    height: 52px;
    font-size: 1.5rem;
  }

  .feature-card h3 {
    font-size: 1.05rem;
  }

  .feature-card p {
    font-size: 0.85rem;
  }

  /* Tip Cards */
  .tip-card {
    flex-direction: column;
    text-align: center;
    padding: 1.25rem;
  }

  .tip-icon {
    margin: 0 auto 0.75rem;
  }

  /* Buttons */
  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
  }

  .btn-lg {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
  }

  .btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: 0.8rem;
  }

  /* Contact Form */
  .form-group input,
  .form-group textarea,
  .form-group select {
    padding: 0.7rem 0.85rem;
    font-size: 0.9rem;
  }

  .form-group textarea {
    min-height: 120px;
  }

  /* Comparison */
  .comparison-panel-body {
    min-height: 140px;
    padding: 1rem;
    font-size: 0.9rem;
  }

  /* Footer */
  .footer {
    padding: 3rem 0 0;
  }

  .footer-grid {
    padding: 0 1rem 2rem;
    gap: 1.75rem;
  }

  .footer-title {
    font-size: 0.9rem;
  }

  .footer-links a {
    font-size: 0.85rem;
  }

  .footer-bottom p {
    font-size: 0.8rem;
  }

  /* Social Share */
  .share-icon {
    width: 36px;
    height: 36px;
    font-size: 0.9rem;
  }

  /* Cookie Consent */
  .cookie-consent {
    padding: 1rem;
  }

  .cookie-consent-text p {
    font-size: 0.85rem;
  }

  .cookie-accept-btn,
  .cookie-decline-btn {
    padding: 0.55rem 1.2rem;
    font-size: 0.85rem;
  }

  /* Breadcrumbs */
  .breadcrumbs-list {
    gap: 0.35rem;
  }

  .breadcrumbs-item {
    font-size: 0.8rem;
  }

  /* Alerts */
  .alert {
    padding: 0.85rem 1rem;
    font-size: 0.9rem;
  }

  /* Tables */
  table {
    font-size: 0.8rem;
  }

  th, td {
    padding: 0.55rem 0.6rem;
  }

  /* Ad Placeholders */
  .ad-placeholder {
    min-height: 80px;
    padding: 1.5rem 1rem;
    font-size: 0.8rem;
  }

  /* Language Switch */
  .lang-switch {
    gap: 0.35rem;
  }

  .lang-switch-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }

  /* Section Titles */
  .section-title h2 {
    font-size: 1.5rem;
  }

  .section-title p {
    font-size: 0.95rem;
  }

  /* Content Pages */
  .content-page {
    padding: 5rem 1rem 2.5rem;
  }

  .content-section {
    margin-bottom: 2rem;
  }

  .content-section h2 {
    font-size: 1.25rem;
  }

  .content-section h3 {
    font-size: 1.1rem;
  }

  .content-section p,
  .content-section li {
    font-size: 0.9rem;
  }

  /* Donations */
  .donate-card h3 {
    font-size: 1.25rem;
  }

  .donate-card p {
    font-size: 0.9rem;
  }

  /* Copy Toast */
  .copy-toast {
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
  }
}

/* ============================================
   MOBILE SMALL: max-width 360px
   ============================================ */
@media (max-width: 360px) {
  .hero h1 {
    font-size: 1.45rem;
  }

  .spinner-card {
    padding: 0.85rem;
  }

  .spinner-title {
    font-size: 1.15rem;
  }

  .mode-btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.75rem;
  }

  .btn {
    padding: 0.55rem 1rem;
    font-size: 0.85rem;
  }

  .card {
    padding: 0.85rem;
  }

  .feature-icon {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
  }

  .footer-grid {
    gap: 1.5rem;
  }
}

/* ============================================
   DESKTOP: min-width 1025px
   ============================================ */
@media (min-width: 1025px) {
  .hide-desktop {
    display: none !important;
  }

  .show-desktop {
    display: block !important;
  }
}

/* ============================================
   LARGE DESKTOP: min-width 1280px
   ============================================ */
@media (min-width: 1280px) {
  .container {
    max-width: 1200px;
  }

  .hero h1 {
    font-size: 3.25rem;
  }
}

/* ============================================
   ULTRA WIDE: min-width 1536px
   ============================================ */
@media (min-width: 1536px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */
@media (hover: none) and (pointer: coarse) {
  .card:hover {
    transform: none;
  }

  .btn:hover {
    transform: none;
  }

  .share-icon:hover {
    transform: none;
  }

  .social-icon:hover {
    transform: none;
  }

  .back-to-top:hover {
    transform: none;
  }

  .feature-card:hover {
    transform: none;
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .loading-spinner {
    animation: spin 1.2s linear infinite;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .header,
  .footer,
  .back-to-top,
  .cookie-consent,
  .ad-container,
  .social-share,
  .donate-section,
  .hamburger,
  .nav-links,
  .copy-toast,
  .spinner-overlay,
  .compare-section {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
    font-size: 12pt;
  }

  .hero {
    background: none;
    color: #000000;
    padding: 1rem 0;
  }

  .hero h1 {
    color: #000000;
    font-size: 24pt;
  }

  .hero p {
    color: #333333;
  }

  .spinner-card,
  .card {
    box-shadow: none;
    border: 1px solid #cccccc;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  a {
    text-decoration: underline;
    color: #000000;
  }

  .footer-bottom {
    border-top: 1px solid #cccccc;
  }
}