/* ============================================================
   shared.css — Base + Shared Components
   Used by: index.html, result.html, admin.html
   ============================================================ */

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

body::before {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 10% 0%, var(--grad1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 70% at 90% 100%, var(--grad2) 0%, transparent 70%);
  transition: background 0.3s;
}

/* ── Sticky Header ── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 0.3s, border-color 0.3s;
}

.header-inner {
  max-width: 760px; margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; gap: 12px;
}

/* result page has narrower max-width */
.header-inner--narrow { max-width: 680px; }

.logo-text { font-size: 12px; letter-spacing: 2.5px; color: var(--muted); text-transform: uppercase; flex: 1; }
.logo-sep  { color: var(--orange); opacity: 0.6; margin: 0 5px; }

/* ── Theme Toggle ── */
.theme-toggle {
  display: flex; align-items: center; gap: 7px;
  background: var(--card); border: 1px solid var(--border); border-radius: 24px;
  padding: 6px 14px; cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow); flex-shrink: 0;
}
.theme-toggle:hover  { border-color: var(--orange); box-shadow: 0 0 0 3px var(--orange-soft); }
.theme-toggle svg    { width: 14px; height: 14px; display: block; }
.theme-toggle-label  { font-size: 12px; color: var(--muted); font-weight: 500; }

/* ── Shared Buttons ── */
.btn {
  padding: 14px 26px; border-radius: 8px; font-size: 15px;
  font-family: var(--font-body); cursor: pointer;
  font-weight: 600; border: none; transition: all 0.2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--orange), var(--orange2));
  color: #FFFFFF; flex: 1;
  box-shadow: 0 2px 10px rgba(224,96,32,0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(224,96,32,0.40); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-ghost {
  background: var(--card); color: var(--muted);
  border: 1.5px solid var(--border); box-shadow: var(--shadow);
}
.btn-ghost:hover { border-color: var(--orange); color: var(--orange); }

.btn-row { display: flex; gap: 12px; margin-top: 32px; }

/* ── Loading Overlay ── */
.loading-overlay {
  position: fixed; inset: 0; background: var(--bg);
  display: none; flex-direction: column;
  align-items: center; justify-content: center; z-index: 100; opacity: 0.95;
}
.loading-overlay.show { display: flex; }
.spinner {
  width: 44px; height: 44px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--orange);
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--muted); font-size: 14px; margin-top: 16px; }

/* ── Error Box ── */
.error-msg {
  background: var(--err-bg); border: 1px solid var(--err-border);
  color: var(--err-text); padding: 12px 16px; border-radius: 8px;
  font-size: 14px; margin-bottom: 14px; display: none;
}
.error-msg.show { display: block; }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}