/* style.css - Modern Minimalist Stylesheet for Save Image As Type Website */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Color System */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --brand-primary: #4f46e5;
  --brand-primary-light: #e0e7ff;
  --brand-secondary: #818cf8;
  
  --accent-success: #10b981;
  --accent-success-light: #d1fae5;
  --accent-warning: #f59e0b;
  
  --border-color: #e2e8f0;
  --border-focus: #cbd5e1;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.04), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.03), 0 8px 10px -6px rgb(0 0 0 / 0.03);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(at 0% 0%, hsla(243,100%,96%,1) 0px, transparent 50%),
    radial-gradient(at 100% 0%, hsla(253,100%,97%,1) 0px, transparent 50%),
    radial-gradient(at 50% 100%, hsla(220,100%,97%,1) 0px, transparent 50%);
  background-attachment: fixed;
}

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

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

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

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(248, 250, 252, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: all var(--transition-normal);
}

header.scrolled {
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  transition: transform var(--transition-normal) ease;
}

.logo:hover img {
  transform: rotate(10deg) scale(1.05);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--brand-primary);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background-color: var(--brand-secondary);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  padding-top: 60px;
  padding-bottom: 80px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

/* Sandbox Converter (Hero Interactive Simulator) */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.sandbox-container {
  width: 100%;
  max-width: 440px;
  background-color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sandbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.sandbox-title {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sandbox-title span {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--accent-success-light);
  color: var(--accent-success);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.sandbox-dropzone {
  border: 2px dashed var(--border-focus);
  border-radius: var(--radius-md);
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background-color: rgba(248, 250, 252, 0.5);
}

.sandbox-dropzone:hover, .sandbox-dropzone.dragover {
  border-color: var(--brand-primary);
  background-color: var(--brand-primary-light);
}

.sandbox-dropzone svg {
  width: 40px;
  height: 40px;
  color: var(--brand-primary);
  transition: transform var(--transition-normal);
}

.sandbox-dropzone:hover svg {
  transform: translateY(-4px);
}

.sandbox-preview-container {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.sandbox-preview-frame {
  position: relative;
  width: 100%;
  height: 180px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
  align-items: center;
}

.sandbox-preview-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.sandbox-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(15, 23, 42, 0.75);
  color: #fff;
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.sandbox-remove:hover {
  background: rgba(15, 23, 42, 0.95);
}

.sandbox-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sandbox-select-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sandbox-select-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.sandbox-select {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  transition: border var(--transition-fast);
}

.sandbox-select:focus {
  border-color: var(--brand-primary);
}

/* Feature Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--brand-primary-light);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon-wrapper svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.25rem;
}

/* Guide Section & Instructions */
.guide-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: flex-start;
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.step-card {
  display: flex;
  gap: 20px;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background-color: var(--brand-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.step-info h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.guide-illustration {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 110px;
}

.ui-mockup {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

.ui-mockup-header {
  height: 36px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 6px;
}

.mock-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border-focus);
}

.mock-dot:nth-child(1) { background-color: #ef4444; }
.mock-dot:nth-child(2) { background-color: #eab308; }
.mock-dot:nth-child(3) { background-color: #22c55e; }

.ui-mockup-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 280px;
  justify-content: center;
  align-items: center;
  position: relative;
}

/* Custom Context Menu Illustration */
.context-menu-mock {
  position: absolute;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  width: 200px;
  padding: 6px 0;
  top: 40px;
  right: 40px;
  font-size: 0.85rem;
  z-index: 10;
  animation: fadeIn 0.2s ease-out;
}

.context-item {
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-primary);
}

.context-item:hover {
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
}

.context-separator {
  height: 1px;
  background-color: var(--border-color);
  margin: 4px 0;
}

/* Keyboard Shortcuts Section */
.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.shortcut-card {
  background-color: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.kbd-group {
  display: flex;
  gap: 6px;
  align-items: center;
}

kbd {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-focus);
  border-bottom: 3px solid var(--border-focus);
  border-radius: 6px;
  padding: 4px 10px;
  font-family: monospace;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* FAQ Accordion */
.faq-list {
  max-width: 800px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

details {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

details[open] {
  box-shadow: var(--shadow-md);
  border-color: var(--brand-primary-light);
}

summary {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  font-family: var(--font-display);
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  transition: transform var(--transition-normal);
  color: var(--brand-primary);
}

details[open] summary::after {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  border-top: 1px solid transparent;
  font-size: 0.95rem;
}

details[open] .faq-content {
  border-top-color: var(--border-color);
}

/* Footer & Legal Modals */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0;
  margin-top: 60px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
}

.footer-logo img {
  width: 28px;
  height: 28px;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links button,
.footer-links a {
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer-links button:hover,
.footer-links a:hover {
  color: var(--brand-primary);
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Modals/Dialogs */
dialog {
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 680px;
  width: 90%;
  padding: 32px;
  background-color: var(--bg-secondary);
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  outline: none;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}

dialog[open] {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

dialog::backdrop {
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.3s ease;
}

dialog[open]::backdrop {
  opacity: 1;
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.dialog-close {
  background: var(--bg-tertiary);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.dialog-close:hover {
  background-color: var(--border-focus);
}

.dialog-body {
  overflow-y: auto;
  padding-right: 8px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dialog-body h3 {
  margin-top: 16px;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.dialog-body ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dialog-body p strong {
  color: var(--text-primary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Utilities */
@media (max-width: 968px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .badge, .hero-actions {
    align-self: center;
  }
  .hero-visual {
    order: -1;
  }
  .guide-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .guide-illustration {
    position: static;
  }
}

@media (max-width: 640px) {
  nav ul {
    display: none; /* simple mobile hide for minimalist design */
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }
}