/* ===== Design tokens ===== */
:root {
  --bg: #faf6f4;
  --surface: #ffffff;
  --ink: #2c2422;
  --ink-soft: #6f625e;
  --border: #ece1dd;
  --primary: #c97b63;
  --primary-dark: #a85f49;
  --primary-soft: #f6e2da;
  --accent: #7f9c8f;
  --accent-soft: #e4ece7;
  --warn: #c0524a;
  --warn-bg: #fbecea;
  --good: #4f8f6d;
  --mid: #c98a3a;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow: 0 6px 20px -14px rgba(40, 30, 25, 0.22);
  --header-start: #fff;
  --dropzone-bg: #fdfaf9;
  --card-muted: #fdfaf9;
  --button-hover: #f4ece9;
  --disabled-bg: #e5d8d3;
  --disabled-ink: #a89a95;
  --track: #ece1dd;
  font-size: 16px;
}

:root[data-theme="dark"] {
  --bg: #1c1918;
  --surface: #282322;
  --ink: #f5eeeb;
  --ink-soft: #c8bbb6;
  --border: #4a403d;
  --primary: #e59a80;
  --primary-dark: #ffc0a9;
  --primary-soft: #513b34;
  --accent-soft: #35453f;
  --warn-bg: #533431;
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.5);
  --header-start: #24201f;
  --dropzone-bg: #221e1d;
  --card-muted: #221e1d;
  --button-hover: #3a302e;
  --disabled-bg: #4a403d;
  --disabled-ink: #b7aaa5;
  --track: #4a403d;
}

* { box-sizing: border-box; }

/* Author rules like `.loading { display:flex }` outrank the UA's
   `[hidden]{display:none}` by cascade origin, not specificity — so any
   hidden element with an explicit display value would still render. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.wrap {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 20px;
}

h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.section-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.section-desc {
  margin: 0 0 20px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* ===== Header ===== */
.site-header {
  padding: 44px 0 28px;
  text-align: center;
  background: linear-gradient(180deg, var(--header-start) 0%, var(--bg) 100%);
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  min-height: 34px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover { background: var(--button-hover); color: var(--ink); }
.theme-toggle:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 3px; }
.theme-toggle-icon { font-size: 1rem; line-height: 1; }

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 1.9rem;
  font-weight: 700;
}

.brand-icon {
  color: var(--primary);
  font-size: 1.4rem;
}

.brand-name em {
  font-style: normal;
  color: var(--primary);
}

.tagline {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* ===== Layout ===== */
main.wrap {
  padding-top: 32px;
  padding-bottom: 60px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}

.results {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.results .card { box-shadow: none; }

/* ===== Dropzone ===== */
.dropzone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  background: var(--dropzone-bg);
  transition: border-color 0.2s ease, background 0.2s ease;
  cursor: pointer;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dropzone.drag-over {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.dropzone-inner {
  text-align: center;
  padding: 40px 20px;
  color: var(--ink-soft);
}

.dropzone-icon {
  font-size: 2.4rem;
  display: block;
  margin-bottom: 10px;
}

.dropzone-inner p { margin: 0 0 6px; color: var(--ink); }

.dropzone-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.preview-wrap {
  width: 100%;
  padding: 16px;
  display: flex;
  justify-content: center;
}

.preview-wrap img {
  max-width: 100%;
  max-height: 360px;
  border-radius: var(--radius-md);
  object-fit: contain;
  box-shadow: var(--shadow);
}

.kakao-consult-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fee500;
  color: #191919;
  text-decoration: none;
}

.kakao-consult-btn:hover { filter: brightness(0.95); }

/* ===== Buttons ===== */
.upload-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 16px -8px rgba(201, 123, 99, 0.5);
}

.btn-primary:hover:not(:disabled) { box-shadow: 0 8px 20px -8px rgba(201, 123, 99, 0.6); }

.btn-primary:disabled {
  background: var(--disabled-bg);
  color: var(--disabled-ink);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--border);
}

.btn-ghost:hover { background: var(--button-hover); }

/* ===== Loading ===== */
.loading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--primary-soft);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Metrics ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.metric {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  background: var(--card-muted);
}

.metric-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}

.metric-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.metric-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
}

.badge-low { background: var(--accent-soft); color: var(--good); }
.badge-mid { background: #f8ecd8; color: var(--mid); }
.badge-high { background: var(--warn-bg); color: var(--warn); }

.metric-bar-track {
  height: 8px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
  margin-bottom: 10px;
}

.metric-bar-fill {
  height: 100%;
  border-radius: 999px;
  width: 0%;
  transition: width 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.fill-low { background: var(--good); }
.fill-mid { background: var(--mid); }
.fill-high { background: var(--warn); }

.metric-desc {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ===== Skin age hero ===== */
.skin-age-card {
  text-align: center;
  padding: 32px 28px;
}

.skin-age-hero {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  line-height: 1;
  margin: 6px 0 10px;
}

.skin-age-hero-value {
  font-size: 4.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--primary);
}

.skin-age-hero-unit {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.skin-age-hero-caption {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

/* ===== Care routine ===== */
.skin-summary {
  margin: 0 0 22px;
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-muted);
}

.skin-summary p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.skin-summary strong { color: var(--ink); }

.care-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.care-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  background: var(--card-muted);
}

.care-step-featured {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.care-step-featured .care-step-visual {
  background: var(--surface);
  color: var(--primary);
}

.care-step-visual {
  flex: none;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.care-step-visual svg { width: 26px; height: 26px; }

.care-step-body { flex: 1; min-width: 0; }

.care-step-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.care-step-num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary-dark);
}

.care-step-head h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
}

.care-step-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  white-space: nowrap;
}

.care-step-product {
  margin: 0 0 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
}

.care-step-why {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.care-step-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 16px;
  margin-top: 12px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.care-step-cta:hover { background: var(--primary-dark); }

/* ===== History ===== */
.history-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 6px;
}

.history-head .section-desc { margin-bottom: 0; }

.btn-clear-history {
  padding: 9px 16px;
  font-size: 0.85rem;
  flex: none;
  white-space: nowrap;
}

.history-empty {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin: 14px 0 0;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  background: var(--card-muted);
}

.history-thumb {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex: none;
  background: var(--track);
}

.history-info {
  flex: 1;
  min-width: 0;
}

.history-date {
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.history-type {
  font-weight: 700;
  font-size: 0.92rem;
  margin: 2px 0 6px;
}

.history-scores {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.history-scores span {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--good);
}

.history-delete {
  flex: none;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.history-delete:hover { background: var(--button-hover); color: var(--warn); }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 26px 0 40px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.site-footer p { margin: 4px 0; }

/* ===== Responsive ===== */
@media (max-width: 560px) {
  .card { padding: 20px; }
  .brand { font-size: 1.5rem; }
  .btn { flex: 1; text-align: center; }
  .care-step { flex-direction: column; }
  .care-step-cta { width: 100%; }
  .skin-age-hero-value { font-size: 3.2rem; }
}