:root {
  --sky-50: #f3fbff;
  --sky-100: #e1f5ff;
  --sky-200: #c5ebfa;
  --sky-400: #49b7e5;
  --sky-500: #158ec6;
  --sky-600: #0c6fa7;
  --ink-950: #123047;
  --ink-700: #3b5b70;
  --ink-500: #688395;
  --line: #d6e8f1;
  --white: #ffffff;
  --success: #158060;
  --shadow: 0 20px 60px rgba(40, 111, 143, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--sky-50); color: var(--ink-950); font-family: Inter, Pretendard, "Noto Sans KR", Arial, sans-serif; line-height: 1.6; }
button, select, input { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: -4rem; left: 1rem; z-index: 10; padding: 0.7rem 1rem; background: var(--ink-950); color: var(--white); border-radius: 4px; }
.skip-link:focus { top: 1rem; }
.section-shell { width: min(100% - 2.5rem, 1080px); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 5; background: rgba(243, 251, 255, 0.93); border-bottom: 1px solid rgba(214, 232, 241, 0.85); backdrop-filter: blur(14px); }
.header-inner { width: min(100% - 2.5rem, 1180px); min-height: 74px; margin: auto; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.55rem; font-weight: 800; font-size: 1.1rem; letter-spacing: 0; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: var(--white); background: var(--sky-500); border-radius: 7px; }
.brand-mark svg { width: 18px; }
.desktop-nav { display: flex; align-items: center; gap: 1.5rem; margin-left: auto; color: var(--ink-700); font-size: 0.92rem; }
.desktop-nav a:hover { color: var(--sky-600); }
.language-picker { display: inline-flex; align-items: center; gap: 0.42rem; color: var(--ink-700); }
.language-picker svg { width: 18px; }
.language-picker select { appearance: none; border: 0; background: transparent; color: var(--ink-700); cursor: pointer; }

.intro { padding-top: 5.5rem; text-align: center; }
.eyebrow, .section-kicker { margin: 0; color: var(--sky-600); font-size: 0.82rem; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.eyebrow { display: inline-flex; align-items: center; gap: 0.42rem; padding: 0.32rem 0.7rem; border: 1px solid var(--sky-200); border-radius: 999px; background: var(--white); }
.eyebrow span:first-child { width: 7px; height: 7px; border-radius: 50%; background: var(--success); }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { max-width: 720px; margin: 1rem auto 0; font-size: clamp(2rem, 5vw, 3.65rem); line-height: 1.12; letter-spacing: 0; }
.intro-copy { max-width: 620px; margin: 1.2rem auto 0; color: var(--ink-700); font-size: 1.06rem; }

.compressor { margin-top: 3.2rem; padding: clamp(1.25rem, 4vw, 2.75rem); background: var(--white); border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); }
.tool-heading, .result-heading, .progress-copy, .result-actions { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.tool-heading h2, .content-heading h2 { margin: 0.25rem 0 0; font-size: clamp(1.4rem, 3vw, 1.9rem); line-height: 1.25; letter-spacing: 0; }
.privacy-chip { display: inline-flex; align-items: center; gap: 0.36rem; flex: 0 0 auto; margin: 0; color: var(--success); font-size: 0.82rem; font-weight: 700; }
.privacy-chip svg { width: 16px; }
.drop-zone { display: grid; justify-items: center; padding: clamp(2rem, 7vw, 4rem) 1.4rem; margin-top: 1.7rem; border: 1.5px dashed #8fcde7; border-radius: 7px; background: #f8fdff; text-align: center; transition: background 160ms ease, border-color 160ms ease, transform 160ms ease; outline: none; }
.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.is-dragging { border-color: var(--sky-500); background: var(--sky-100); }
.drop-zone.is-dragging { transform: scale(1.005); }
.upload-icon, .success-icon { display: grid; place-items: center; width: 53px; height: 53px; border-radius: 50%; color: var(--sky-600); background: var(--sky-100); }
.upload-icon svg { width: 25px; }
.drop-title { margin: 1rem 0 0; font-size: 1.1rem; font-weight: 800; }
.drop-hint, .format-note { margin: 0.2rem 0 0; color: var(--ink-500); font-size: 0.9rem; }
.format-note { margin-top: 0.9rem; font-size: 0.78rem; }
.primary-button, .secondary-button, .icon-button { min-height: 42px; border-radius: 6px; border: 1px solid transparent; font-weight: 800; transition: transform 150ms ease, background 150ms ease, border-color 150ms ease; }
.primary-button { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; margin-top: 1.25rem; padding: 0.7rem 1rem; background: var(--sky-500); color: var(--white); }
.primary-button:hover { background: var(--sky-600); transform: translateY(-1px); }
.primary-button:disabled { cursor: wait; opacity: 0.65; transform: none; }
.primary-button svg, .secondary-button svg { width: 17px; }
.workspace { margin-top: 1.5rem; }
.file-summary { display: flex; align-items: center; gap: 0.9rem; padding: 0.9rem; border-bottom: 1px solid var(--line); }
.preview-wrap { display: grid; place-items: center; width: 62px; height: 62px; flex: 0 0 auto; overflow: hidden; border-radius: 6px; background: var(--sky-100); }
.preview-wrap img { width: 100%; height: 100%; object-fit: cover; }
.file-meta { min-width: 0; }
.file-name { margin: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 800; }
.file-details { margin: 0.15rem 0 0; color: var(--ink-500); font-size: 0.86rem; }
.icon-button { display: grid; place-items: center; width: 38px; padding: 0; margin-left: auto; background: var(--white); color: var(--ink-700); border-color: var(--line); }
.icon-button:hover { color: #b33131; border-color: #efcaca; background: #fff8f8; }
.icon-button svg { width: 18px; }
.settings-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(160px, 0.5fr); gap: 1.5rem; padding: 1.3rem 0; }
.control-group { display: grid; gap: 0.55rem; color: var(--ink-700); font-size: 0.9rem; font-weight: 700; }
.control-group > span { display: flex; justify-content: space-between; gap: 0.5rem; }
.control-group strong { color: var(--sky-600); }
input[type="range"] { width: 100%; accent-color: var(--sky-500); }
.control-group select { min-height: 40px; border: 1px solid var(--line); border-radius: 5px; padding: 0 0.7rem; background: var(--white); color: var(--ink-950); }
.action-button { width: 100%; margin-top: 0; }
.progress-panel { margin-top: 1.35rem; padding: 1rem 1.1rem; background: var(--sky-50); border-radius: 6px; }
.progress-copy { color: var(--ink-700); font-size: 0.9rem; }
.progress-copy strong { color: var(--sky-600); }
.progress-track { height: 8px; overflow: hidden; margin-top: 0.7rem; background: var(--sky-200); border-radius: 99px; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--sky-500); border-radius: inherit; transition: width 180ms ease; }
.result-panel { margin-top: 1.5rem; padding: 1.2rem; border: 1px solid #bfe8da; border-radius: 7px; background: #f7fffb; }
.success-icon { width: 40px; height: 40px; color: var(--success); background: #dbf5e9; }
.success-icon svg { width: 20px; }
.result-heading { justify-content: flex-start; }
.result-heading h3 { margin: 0.1rem 0 0; font-size: 1.1rem; }
.result-stats { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 1.1rem; border-block: 1px solid #d7eee5; }
.result-stats > div { display: grid; gap: 0.15rem; padding: 0.75rem; }
.result-stats > div + div { border-left: 1px solid #d7eee5; }
.result-stats span { color: var(--ink-500); font-size: 0.78rem; }
.result-stats strong { font-size: 1rem; }
.result-stats .saved strong { color: var(--success); }
.result-actions { justify-content: flex-start; margin-top: 1rem; }
.result-actions .primary-button, .result-actions .secondary-button { margin-top: 0; }
.secondary-button { display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem; padding: 0.7rem 1rem; color: var(--ink-700); background: var(--white); border-color: var(--line); }
.secondary-button:hover { border-color: var(--sky-400); background: var(--sky-50); }
.status-message { min-height: 1.5rem; margin: 0.8rem 0 0; color: #b33131; font-size: 0.85rem; text-align: center; }

.content-section { padding-top: 6rem; }
.content-heading { max-width: 630px; }
.prose-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 3rem; margin-top: 1.3rem; color: var(--ink-700); }
.prose-grid p { margin: 0; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 1.5rem; border: 1px solid var(--line); background: var(--line); }
.feature-item { padding: 1.5rem; background: var(--white); }
.feature-item > svg { width: 22px; color: var(--sky-600); }
.feature-item h3 { margin: 0.85rem 0 0; font-size: 1rem; }
.feature-item p { margin: 0.5rem 0 0; color: var(--ink-700); font-size: 0.9rem; }
.faq-section { padding-bottom: 0; }
.faq-list { margin-top: 1.3rem; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 1rem 2rem 1rem 0; cursor: pointer; font-weight: 800; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { position: absolute; right: 0; content: "+"; color: var(--sky-600); font-size: 1.3rem; font-weight: 400; }
details[open] summary::after { content: "−"; }
details p { margin: -0.2rem 0 1rem; color: var(--ink-700); }
.privacy-section { padding-bottom: 6rem; }
.privacy-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 0 3rem; margin-top: 1.3rem; color: var(--ink-700); }
.privacy-copy > p { grid-column: 1 / -1; margin: 0 0 1.3rem; padding-bottom: 1.3rem; border-bottom: 1px solid var(--line); }
.privacy-copy h3 { margin: 1rem 0 0; font-size: 0.98rem; color: var(--ink-950); }
.privacy-copy div p { margin: 0.35rem 0 0; font-size: 0.92rem; }
.site-footer { padding: 1.6rem 0; border-top: 1px solid var(--line); background: #e9f7fd; color: var(--ink-700); font-size: 0.85rem; }
.site-footer > div { display: flex; justify-content: space-between; gap: 1rem; }
.site-footer p { margin: 0; }

@media (max-width: 700px) {
  .section-shell, .header-inner { width: min(100% - 1.5rem, 1080px); }
  .header-inner { min-height: 64px; }
  .desktop-nav { display: none; }
  .language-picker { margin-left: auto; }
  .intro { padding-top: 3.75rem; }
  .compressor { margin-top: 2.3rem; padding: 1rem; }
  .tool-heading { align-items: flex-start; }
  .privacy-chip { max-width: 125px; align-items: flex-start; }
  .settings-grid, .prose-grid, .privacy-copy { grid-template-columns: 1fr; gap: 1rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-item { padding: 1.25rem; }
  .content-section { padding-top: 4rem; }
  .privacy-section { padding-bottom: 4rem; }
  .result-stats > div { padding: 0.65rem 0.45rem; }
  .result-stats strong { font-size: 0.88rem; }
  .result-actions { align-items: stretch; flex-direction: column; }
  .result-actions .primary-button, .result-actions .secondary-button { width: 100%; }
  .site-footer > div { flex-direction: column; gap: 0.4rem; }
}