/* ===== Mobile-First Modern UI Design - Inspired by iLovePDF & Smallpdf ===== */

:root {
  /* Primary Colors - Modern Purple-Indigo */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --primary-soft: rgba(99, 102, 241, 0.1);
  
  /* Accent Colors */
  --secondary: #f43f5e;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  
  /* Neutral Colors */
  --dark: #0f172a;
  --gray-900: #1e293b;
  --gray-800: #334155;
  --gray-700: #475569;
  --gray-600: #64748b;
  --gray-500: #94a3b8;
  --gray-400: #cbd5e1;
  --gray-300: #e2e8f0;
  --gray-200: #f1f5f9;
  --gray-100: #f8fafc;
  --white: #ffffff;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-card: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
  
  /* Shadows - Softer, more modern */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.04), 0 2px 4px -2px rgba(0,0,0,0.02);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -4px rgba(0,0,0,0.02);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.06), 0 8px 10px -6px rgba(0,0,0,0.02);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.1);
  --shadow-colored: 0 10px 40px -10px rgba(99, 102, 241, 0.3);
  
  /* Border Radius - More rounded for mobile */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  
  /* Transitions */
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Touch Targets - Minimum 44px for mobile */
  --touch-target: 44px;
  --touch-target-lg: 56px;
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

@media (max-width: 375px) {
  html {
    font-size: 15px;
  }
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--gray-100);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* ===== Header - Mobile Optimized ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

@media (min-width: 768px) {
  .header-content {
    height: 72px;
  }
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--dark);
  font-weight: 800;
  font-size: 1.25rem;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .logo {
    font-size: 1.5rem;
    gap: 12px;
  }
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow-md);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .logo-icon {
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
  }
}

.logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: var(--touch-target);
  height: var(--touch-target);
  gap: 5px;
  background: var(--gray-100);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
  z-index: 1001;
}

.nav-toggle:active {
  background: var(--gray-200);
  transform: scale(0.95);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

/* Navigation Menu - Mobile Drawer */
.nav-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--white);
  padding: 80px var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 999;
  overflow-y: auto;
}

.nav-menu.active {
  transform: translateX(0);
}

.nav-menu a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--gray-800);
  font-weight: 600;
  font-size: 1.125rem;
  padding: var(--space-4);
  border-radius: var(--radius);
  transition: var(--transition-fast);
  min-height: var(--touch-target-lg);
}

.nav-menu a:active {
  background: var(--primary-soft);
  color: var(--primary);
}

/* Desktop Navigation */
@media (min-width: 1024px) {
  .nav-menu {
    position: static;
    flex-direction: row;
    padding: 0;
    transform: none;
    background: transparent;
    gap: var(--space-1);
  }
  
  .nav-menu a {
    font-size: 0.9375rem;
    padding: var(--space-2) var(--space-4);
    min-height: auto;
  }
  
  .nav-menu a:hover {
    background: var(--gray-100);
    color: var(--primary);
  }
}

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dropdown-toggle span {
  transition: transform 0.3s ease;
}

.dropdown.active .dropdown-toggle span {
  transform: rotate(180deg);
}

.dropdown-menu {
  list-style: none;
  padding: var(--space-2) 0;
  display: none;
  flex-direction: column;
  gap: var(--space-1);
}

.dropdown.active .dropdown-menu {
  display: flex;
  animation: slideDown 0.2s ease;
}

.dropdown-menu a {
  font-size: 1rem;
  padding-left: var(--space-8);
  font-weight: 500;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 1024px) {
  .dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    min-width: 240px;
    display: flex;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
  }
  
  .dropdown:hover .dropdown-menu,
  .dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .dropdown-menu a {
    padding: var(--space-3) var(--space-4);
    font-size: 0.9375rem;
  }
}

/* Language Switcher */
.lang-switcher {
  display: none;
}

@media (min-width: 768px) {
  .lang-switcher {
    display: flex;
    gap: 4px;
    background: var(--gray-100);
    padding: 4px;
    border-radius: var(--radius-full);
  }
}

.lang-btn {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--gray-500);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 32px;
}

.lang-btn.active {
  background: var(--white);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* Mobile Language Switcher in Menu */
.mobile-lang-switcher {
  display: flex;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--gray-200);
}

.mobile-lang-switcher .lang-btn {
  flex: 1;
  padding: var(--space-3);
  font-size: 1rem;
  background: var(--gray-100);
}

.mobile-lang-switcher .lang-btn.active {
  background: var(--primary);
  color: var(--white);
}

@media (min-width: 1024px) {
  .mobile-lang-switcher {
    display: none;
  }
}

/* ===== Hero Section - Mobile Optimized ===== */
.hero {
  background: var(--gradient-hero);
  padding: 100px 0 60px;
  position: relative;
  overflow: hidden;
  margin-top: 64px;
}

@media (min-width: 768px) {
  .hero {
    padding: 140px 0 100px;
    margin-top: 72px;
  }
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  text-align: center;
  color: var(--white);
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(1.875rem, 7vw, 3.5rem);
  font-weight: 800;
  margin-bottom: var(--space-4);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

@media (min-width: 640px) {
  .hero h1 {
    margin-bottom: var(--space-5);
  }
}

.hero-desc {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  opacity: 0.95;
  max-width: 560px;
  margin: 0 auto var(--space-6);
  font-weight: 400;
  line-height: 1.6;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

@media (max-width: 480px) {
  .hero-badges {
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  border: 1px solid rgba(255,255,255,0.2);
  white-space: nowrap;
}

@media (min-width: 640px) {
  .badge {
    padding: 10px 20px;
    font-size: 0.9375rem;
  }
}

/* ===== Tools Section ===== */
.tools-section {
  padding: var(--space-10) 0;
}

@media (min-width: 768px) {
  .tools-section {
    padding: var(--space-16) 0;
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: var(--space-10);
  }
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-soft);
  color: var(--primary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
}

.section-header h2 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  color: var(--dark);
  letter-spacing: -0.02em;
}

/* Tools Grid - Mobile Optimized */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 480px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }
}

@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Tool Card - Touch Friendly */
.tool-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-decoration: none;
  color: var(--gray-900);
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  border: 1px solid var(--gray-200);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  min-height: 120px;
}

@media (min-width: 640px) {
  .tool-card {
    flex-direction: column;
    padding: var(--space-6);
    min-height: auto;
  }
}

.tool-card:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-sm);
}

@media (min-width: 1024px) {
  .tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
  }
}

.tool-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

@media (min-width: 640px) {
  .tool-icon {
    width: 64px;
    height: 64px;
    font-size: 1.75rem;
  }
}

.tool-card-content {
  flex: 1;
  min-width: 0;
}

.tool-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 640px) {
  .tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
  }
}

.tool-card p {
  color: var(--gray-500);
  font-size: 0.875rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (min-width: 640px) {
  .tool-card p {
    font-size: 0.9375rem;
    -webkit-line-clamp: 3;
  }
}

.popular-badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: var(--gradient-card);
  color: var(--white);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

@media (min-width: 640px) {
  .popular-badge {
    top: var(--space-4);
    right: var(--space-4);
    padding: 6px 12px;
    font-size: 0.75rem;
  }
}

/* ===== Tool Page - Mobile Optimized ===== */
.tool-page {
  padding: 84px 0 40px;
  min-height: calc(100vh - 300px);
}

@media (min-width: 768px) {
  .tool-page {
    padding: 112px 0 60px;
  }
}

.tool-header {
  text-align: center;
  margin-bottom: var(--space-6);
  padding-top: var(--space-4);
}

@media (min-width: 768px) {
  .tool-header {
    margin-bottom: var(--space-10);
    padding-top: var(--space-6);
  }
}

.tool-header h1 {
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 800;
  margin-bottom: var(--space-3);
  color: var(--dark);
  letter-spacing: -0.02em;
}

.tool-header p {
  color: var(--gray-500);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .tool-header p {
    font-size: 1.125rem;
  }
}

/* Upload Container */
.upload-container {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-lg);
  max-width: 680px;
  margin: 0 auto;
  border: 1px solid var(--gray-200);
}

@media (min-width: 640px) {
  .upload-container {
    padding: var(--space-8);
    border-radius: var(--radius-2xl);
  }
}

/* Upload Area - Large Touch Target */
.upload-area {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-5);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--gray-50);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

@media (min-width: 640px) {
  .upload-area {
    padding: var(--space-12) var(--space-8);
  }
}

.upload-area:active {
  border-color: var(--primary);
  background: var(--primary-soft);
  transform: scale(0.99);
}

@media (min-width: 1024px) {
  .upload-area:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
  }
}

.upload-area.dragover {
  border-color: var(--primary);
  background: var(--primary-soft);
  border-style: solid;
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.7;
}

@media (min-width: 640px) {
  .upload-icon {
    font-size: 4rem;
    margin-bottom: var(--space-5);
  }
}

.upload-area h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--dark);
}

@media (min-width: 640px) {
  .upload-area h3 {
    font-size: 1.375rem;
  }
}

.upload-area p {
  color: var(--gray-500);
  font-size: 0.9375rem;
}

.file-types {
  margin-top: var(--space-4);
  font-size: 0.8125rem;
  color: var(--gray-500);
  background: var(--white);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-200);
}

/* ===== Buttons - Large Touch Targets ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: var(--touch-target-lg);
  width: 100%;
}

@media (min-width: 480px) {
  .btn {
    width: auto;
    padding: 14px 28px;
  }
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-colored);
}

.btn-primary:active {
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

@media (min-width: 1024px) {
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.5);
  }
}

.btn-secondary {
  background: var(--white);
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:active {
  background: var(--primary-soft);
}

@media (min-width: 1024px) {
  .btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
  }
}

/* ===== Form Elements - Mobile Optimized ===== */
.tool-options {
  margin: var(--space-5) 0;
  padding: var(--space-4);
  background: var(--gray-50);
  border-radius: var(--radius-lg);
}

@media (min-width: 640px) {
  .tool-options {
    padding: var(--space-5);
  }
}

.tool-options label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--gray-700);
  font-size: 0.9375rem;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 16px; /* Prevents iOS zoom */
  transition: var(--transition-fast);
  font-family: inherit;
  background: var(--white);
  min-height: var(--touch-target-lg);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Size Options */
.size-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.size-btn {
  padding: 10px 16px;
  border: 2px solid var(--gray-200);
  background: var(--white);
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: var(--transition-fast);
  min-height: var(--touch-target);
  flex: 1;
  min-width: 80px;
}

@media (min-width: 480px) {
  .size-btn {
    flex: 0 0 auto;
    padding: 12px 20px;
  }
}

.size-btn.active,
.size-btn:active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

/* Background Options */
.bg-options {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.bg-btn {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  border: 3px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
}

@media (min-width: 480px) {
  .bg-btn {
    width: 56px;
    height: 56px;
  }
}

.bg-btn.blue { background: #3b82f6; }
.bg-btn.white { background: #ffffff; border-color: var(--gray-300); }
.bg-btn.red { background: #ef4444; }
.bg-btn.gray { background: #6b7280; }

.bg-btn.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
  transform: scale(1.05);
}

.bg-btn.active::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--white);
  font-weight: bold;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.bg-btn.white.active::after {
  color: var(--dark);
  text-shadow: none;
}

/* File List */
.file-list {
  margin: var(--space-4) 0;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--gray-50);
  border-radius: var(--radius);
  margin-bottom: var(--space-2);
  border: 1px solid var(--gray-200);
  gap: var(--space-3);
}

.file-item span {
  font-weight: 500;
  color: var(--gray-700);
  font-size: 0.9375rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.remove-btn {
  background: var(--secondary);
  color: var(--white);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: 1.25rem;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.remove-btn:active {
  background: #e11d48;
  transform: scale(0.95);
}

/* ===== How It Works ===== */
.how-it-works {
  padding: var(--space-10) 0;
  background: var(--white);
}

@media (min-width: 768px) {
  .how-it-works {
    padding: var(--space-16) 0;
  }
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
}

@media (min-width: 768px) {
  .steps-grid {
    gap: var(--space-8);
  }
}

.step-card {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  position: relative;
}

@media (min-width: 640px) {
  .step-card {
    padding: var(--space-8) var(--space-5);
  }
}

.step-number {
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.125rem;
  margin: 0 auto var(--space-4);
  box-shadow: var(--shadow-colored);
}

@media (min-width: 640px) {
  .step-number {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
  }
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

@media (min-width: 640px) {
  .step-icon {
    font-size: 3rem;
  }
}

.step-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--dark);
}

.step-card p {
  color: var(--gray-500);
  font-size: 0.9375rem;
}

.privacy-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-align: center;
  padding: var(--space-4) var(--space-5);
  background: rgba(16, 185, 129, 0.08);
  border-radius: var(--radius-lg);
  color: var(--success);
  font-weight: 600;
  font-size: 0.9375rem;
  max-width: 520px;
  margin: 0 auto;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

/* ===== Footer - Mobile Optimized ===== */
.site-footer {
  background: var(--dark);
  color: var(--white);
  padding: var(--space-10) 0 var(--space-6);
}

@media (min-width: 768px) {
  .site-footer {
    padding: var(--space-16) 0 var(--space-8);
  }
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-10);
  }
}

.footer-brand .logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--white);
  display: inline-block;
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .footer-brand .logo-text {
    font-size: 1.75rem;
  }
}

.footer-desc {
  color: var(--gray-400);
  line-height: 1.7;
  font-size: 0.9375rem;
}

.footer-section h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--white);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-3);
}

.footer-section a {
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition-fast);
  display: inline-block;
  padding: 4px 0;
  min-height: var(--touch-target);
  display: flex;
  align-items: center;
}

.footer-section a:active {
  color: var(--white);
}

@media (min-width: 1024px) {
  .footer-section a:hover {
    color: var(--white);
  }
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.1);
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* ===== Error/404 Pages ===== */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  color: var(--white);
  text-align: center;
  padding: var(--space-5);
}

.error-page h1 {
  font-size: 6rem;
  font-weight: 800;
  opacity: 0.3;
  line-height: 1;
}

@media (min-width: 640px) {
  .error-page h1 {
    font-size: 8rem;
  }
}

.error-page h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}

@media (min-width: 640px) {
  .error-page h2 {
    font-size: 2rem;
  }
}

.error-page p {
  opacity: 0.9;
  margin-bottom: var(--space-6);
  font-size: 1rem;
}

/* ===== Ad Section ===== */
.ad-section {
  padding: var(--space-6) 0;
  background: var(--white);
  text-align: center;
}

@media (min-width: 768px) {
  .ad-section {
    padding: var(--space-10) 0;
  }
}

/* ===== Canvas ===== */
#canvas-container {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-4) 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

#photoCanvas {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

/* ===== Loading States ===== */
.loading {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Progress Bar ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: var(--space-4) 0;
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* ===== Toast Notifications ===== */
.toast {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--dark);
  color: var(--white);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.9375rem;
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s ease;
  max-width: 90vw;
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

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

.toast.error {
  background: var(--secondary);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-card {
  animation: fadeInUp 0.5s ease backwards;
}

.tool-card:nth-child(1) { animation-delay: 0s; }
.tool-card:nth-child(2) { animation-delay: 0.05s; }
.tool-card:nth-child(3) { animation-delay: 0.1s; }
.tool-card:nth-child(4) { animation-delay: 0.15s; }
.tool-card:nth-child(5) { animation-delay: 0.2s; }
.tool-card:nth-child(6) { animation-delay: 0.25s; }

/* ===== Safe Area for Notch Phones ===== */
@supports (padding-top: env(safe-area-inset-top)) {
  .site-header {
    padding-top: env(safe-area-inset-top);
  }
  
  .hero {
    margin-top: calc(64px + env(safe-area-inset-top));
  }
  
  @media (min-width: 768px) {
    .hero {
      margin-top: calc(72px + env(safe-area-inset-top));
    }
  }
  
  .nav-menu {
    padding-top: calc(80px + env(safe-area-inset-top));
  }
}

/* ===== Print Styles ===== */
@media print {
  .site-header,
  .ad-section,
  .site-footer {
    display: none;
  }
  
  .hero {
    margin-top: 0;
    padding: 40px 0;
  }
}