/* =============================================
   DESIGN TOKENS
   ============================================= */
:root {
  /* Purple theme */
  --color-primary: #7C3AED;
  --color-primary-dark: #6D28D9;
  --color-primary-light: #EDE9FE;
  --color-primary-lighter: #F5F3FF;
  --color-primary-subtle: #FAFAFF;

  /* Status */
  --color-success: #10B981;
  --color-success-light: #ECFDF5;
  --color-error: #EF4444;
  --color-error-light: #FEF2F2;

  /* Neutrals */
  --color-text: #1a1a1a;
  --color-text-secondary: #555;
  --color-text-muted: #767676;
  --color-bg: #fff;
  --color-bg-alt: #F9FAFB;
  --color-border: #e5e7eb;

  /* Typography */
  --font-family: 'Source Sans 3', 'Segoe UI', Arial, sans-serif;

  /* Spacing */
  --max-width: 800px;
  --max-width-wide: 1100px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* =============================================
   FONT FACES
   ============================================= */
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-regular-ext.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-semibold-ext.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-semibold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-bold-ext.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/fonts/source-sans-3-bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* =============================================
   RESET & BASE
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* =============================================
   LAYOUT
   ============================================= */
.container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: var(--max-width);
}

.section {
  padding: 4rem 0;
}

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

.section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: var(--color-text);
}

/* =============================================
   HEADER
   ============================================= */
.site-header {
  padding: 1rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-header a {
  text-decoration: none;
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* =============================================
   UPLOAD AREA
   ============================================= */
.upload-area {
  border: 2px dashed #A78BFA;
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-subtle);
}

.upload-area:hover,
.upload-area:focus-visible {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-area.drag-over {
  border-color: var(--color-primary);
  border-style: solid;
  background: var(--color-primary-light);
  transform: scale(1.01);
}

.upload-icon {
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.upload-subtext {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.upload-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* =============================================
   COMPRESSION OPTIONS
   ============================================= */
.compression-options {
  margin-top: 1.5rem;
  text-align: left;
}

/* =============================================
   FILE LIST & BATCH SUMMARY
   ============================================= */
.file-list-wrapper {
  margin-top: 1.5rem;
  text-align: left;
}

.batch-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  font-size: 0.9375rem;
  color: var(--color-text);
  font-weight: 600;
}

.batch-summary-size {
  color: var(--color-text-secondary);
  font-weight: 400;
}

.file-list-container {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.file-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
  transition: background 0.15s ease;
}

.file-item:last-child {
  border-bottom: none;
}

.file-item-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.file-item-size {
  color: var(--color-text-muted);
  white-space: nowrap;
  font-size: 0.8125rem;
}

.file-item-status {
  white-space: nowrap;
  font-size: 0.8125rem;
  font-weight: 600;
  min-width: 80px;
  text-align: right;
}

.file-item[data-state="pending"] .file-item-status {
  color: var(--color-text-muted);
}

.file-item[data-state="compressing"] {
  background: var(--color-primary-lighter);
}

.file-item[data-state="compressing"] .file-item-status {
  color: var(--color-primary);
}

.file-item[data-state="complete"] .file-item-status {
  color: var(--color-success);
}

.file-item[data-state="error"] .file-item-status {
  color: var(--color-error);
}

.file-item-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.file-item-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  line-height: 1;
  transition: all 0.15s ease;
  padding: 0;
}

.file-item-remove:hover {
  color: var(--color-error);
  background: var(--color-error-light);
}

.file-item-download {
  display: none;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-success);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  line-height: 1;
  transition: all 0.15s ease;
  padding: 0;
  text-decoration: none;
}

.file-item[data-state="complete"] .file-item-download {
  display: inline-flex;
}

.file-item-download:hover {
  background: var(--color-success-light);
}

.level-selector {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.level-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
}

.level-option:hover {
  border-color: #C4B5FD;
}

.level-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.level-check {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  transition: all 0.15s ease;
  position: relative;
}

.level-option input[type="radio"]:checked ~ .level-check {
  border-color: var(--color-primary);
  background: var(--color-primary);
}

.level-option input[type="radio"]:checked ~ .level-check::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
}

.level-option:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-lighter);
}

.level-option input[type="radio"]:focus-visible ~ .level-check {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.level-content {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.level-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
}

.level-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.level-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  margin-top: 0.25rem;
}

.level-badge--recommended {
  background: var(--color-success-light);
  color: var(--color-success);
}

.level-badge--warning {
  background: #FEF3C7;
  color: #D97706;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn-compress {
  width: 100%;
  padding: 0.875rem 2rem;
  font-size: 1.125rem;
  font-weight: 700;
  font-family: var(--font-family);
  color: white;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-compress:hover {
  background: var(--color-primary-dark);
}

.btn-compress:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-download {
  display: inline-block;
  padding: 0.875rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  font-family: var(--font-family);
  color: white;
  background: var(--color-success);
  border: none;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-download:hover {
  background: #059669;
}

.btn-new {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.5rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font-family);
  color: var(--color-primary);
  background: transparent;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-new:hover {
  background: var(--color-primary-light);
}

/* =============================================
   PROGRESS AREA
   ============================================= */
.progress-area {
  margin-top: 2rem;
  text-align: center;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-primary-light);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-fill--indeterminate {
  width: 30%;
  animation: indeterminate 1.5s ease-in-out infinite;
}

@keyframes indeterminate {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

.progress-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* =============================================
   BATCH PROGRESS
   ============================================= */
.batch-progress {
  margin-top: 2rem;
  text-align: center;
}

.batch-progress-label {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
}

/* =============================================
   BATCH RESULTS
   ============================================= */
.batch-results {
  margin-top: 2rem;
  text-align: center;
}

.batch-results-summary {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.batch-results-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.btn-download-all {
  display: inline-block;
  padding: 0.875rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  font-family: var(--font-family);
  color: white;
  background: var(--color-success);
  border: none;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-download-all:hover {
  background: #059669;
}

.btn-download-all:focus-visible {
  outline: 2px solid var(--color-success);
  outline-offset: 2px;
}

/* =============================================
   RESULTS NOTICE
   ============================================= */
.results-notice {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: #FEF3C7;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  color: #92400E;
  line-height: 1.5;
}

/* =============================================
   ERROR AREA
   ============================================= */
.error-area {
  margin-top: 2rem;
  text-align: center;
  padding: 1.5rem;
  background: var(--color-error-light);
  border-radius: var(--radius-md);
}

.error-text {
  color: var(--color-error);
  font-weight: 600;
  margin-bottom: 1rem;
}

/* =============================================
   STEPS (HOW IT WORKS)
   ============================================= */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

.step {
  padding: 1.5rem 1rem;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* =============================================
   FEATURES GRID
   ============================================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  transition: box-shadow 0.2s ease;
}

.feature-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* =============================================
   ABOUT CONTENT
   ============================================= */
.about-content p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* =============================================
   FAQ
   ============================================= */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-left: 1rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20' fill='none'%3E%3Cpath d='M5 7.5l5 5 5-5' stroke='%23555' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 0 1.25rem;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  padding: 2.5rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.footer-privacy {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-links {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0.5rem 0;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  margin: 0 0.35rem;
}

.footer-links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

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

  .section {
    padding: 3rem 0;
  }

  .section h2 {
    font-size: 1.625rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 2rem 1rem 1.5rem;
  }

  .hero h1 {
    font-size: 1.625rem;
  }

  .upload-area {
    padding: 2rem 1.25rem;
    min-height: 160px;
  }

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

  .level-option {
    padding: 0.875rem 1rem;
  }

  .batch-summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .file-item {
    flex-wrap: wrap;
    gap: 0.25rem 0.5rem;
  }

  .file-item-name {
    flex-basis: calc(100% - 40px);
  }

  .file-item-status {
    min-width: unset;
    text-align: left;
  }

  .file-list-container {
    max-height: 200px;
  }
}