/* ===== Theme Variables ===== */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f2f7;
  --text: #0f172a;
  --muted: #64748b;
  --border: rgba(15, 23, 42, 0.12);

  --primary: #2563eb;
  --primary-contrast: #ffffff;

  --danger: #ef4444;
  --danger-contrast: #ffffff;

  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  --radius: 16px;
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --surface: #0f172a;
  --surface-2: #111c33;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: rgba(226, 232, 240, 0.12);

  --primary: #60a5fa;
  --primary-contrast: #0b1220;

  --danger: #f87171;
  --danger-contrast: #0b1220;

  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

/* ===== Base ===== */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.45;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 16px 60px;
}

h1 {
  margin: 0 0 14px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

/* ===== Topbar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

.card + .card { margin-top: 14px; }

.subtle {
  color: var(--muted);
  font-size: 14px;
}

/* ===== Buttons ===== */
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
  transition: transform .06s ease, background .2s ease, border-color .2s ease, opacity .2s ease;
}

.btn:hover { background: color-mix(in srgb, var(--surface-2) 80%, var(--primary) 20%); text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: color-mix(in srgb, var(--primary) 70%, var(--border) 30%);
}
.btn-primary:hover { background: color-mix(in srgb, var(--primary) 86%, #000 14%); }

.btn-danger {
  background: var(--danger);
  color: var(--danger-contrast);
  border-color: color-mix(in srgb, var(--danger) 70%, var(--border) 30%);
}
.btn-danger:hover { background: color-mix(in srgb, var(--danger) 86%, #000 14%); }

.theme-toggle {
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ===== Forms ===== */
label { display: block; font-weight: 700; margin-bottom: 6px; }
.field { margin-bottom: 12px; }

input[type="text"], input[type="email"], input[type="password"], input[type="file"], input[readonly] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  outline: none;
}
input[readonly] { background: color-mix(in srgb, var(--surface) 85%, var(--surface-2) 15%); }
input:focus { border-color: color-mix(in srgb, var(--primary) 55%, var(--border) 45%); }

/* ===== Alerts ===== */
.alert {
  border-radius: 14px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  margin: 12px 0;
}
.alert.error { border-color: color-mix(in srgb, var(--danger) 45%, var(--border) 55%); }
.alert.ok { border-color: color-mix(in srgb, var(--primary) 45%, var(--border) 55%); }

/* ===== Tables ===== */
.table-wrap {
  overflow: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table { width: 100%; border-collapse: collapse; background: var(--surface); }
th, td { padding: 10px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { text-align: left; color: var(--muted); font-size: 13px; }
tr:last-child td { border-bottom: none; }

.thumb {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--border);
  cursor: pointer;
}

/* ===== Copy Tooltip ===== */
.copy-btn {
  position: relative;
  width: 100%;
  margin-top: 6px;
}

.copy-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 130%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  padding: 5px 9px;
  font-size: 12px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease;
  white-space: nowrap;
}

html[data-theme="dark"] .copy-btn::after {
  background: rgba(226, 232, 240, 0.92);
  color: #0b1220;
}

.copy-btn.show-tooltip::after { opacity: 1; }

/* ===== Image Overlay ===== */
#imageOverlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.88);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#imageOverlay img {
  max-width: 94vw;
  max-height: 92vh;
  object-fit: contain;
  border-radius: 18px;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}

#closeOverlay {
  position: fixed;
  top: 14px;
  right: 18px;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255,255,255,.12);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  cursor: pointer;
  border: 1px solid rgba(255,255,255,.18);
}
#closeOverlay:hover { background: rgba(255,255,255,.18); }