:root {
  --bg: #0f0f14;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.08);
  --text: #e8e8ec;
  --muted: #8a8a9a;
  --accent: #8aadf4;
  --accent2: #f5bde6;
  --shadow: 0 20px 50px rgba(0,0,0,0.45);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius: 18px;
}

[data-theme="day"] {
  --bg: #f6f7fb;
  --surface: rgba(255,255,255,0.85);
  --surface-hover: rgba(255,255,255,1);
  --border: rgba(0,0,0,0.06);
  --text: #16161a;
  --muted: #6b6b75;
  --accent: #5c7cfa;
  --accent2: #e07aac;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
}

[data-theme="glass"] {
  --bg: linear-gradient(135deg, #1a0b2e 0%, #2d1b4e 100%);
  --surface: rgba(255,255,255,0.06);
  --surface-hover: rgba(255,255,255,0.12);
  --border: rgba(255,255,255,0.15);
  --text: #fdf6ff;
  --muted: #c0a8d0;
  --accent: #cba6f7;
  --accent2: #fab387;
  --shadow: 0 25px 60px rgba(50,10,80,0.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 24px;
  transition: background 0.4s ease, color 0.2s ease;
}

/* Header */
header {
  max-width: 1200px;
  margin: 0 auto 24px;
  padding: 0 4px;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.theme-switcher { display: flex; gap: 8px; }
.theme-switcher button {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
}
.theme-switcher button:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Grid */
.grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

/* Cards */
.card {
  background: var(--surface);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  background: var(--surface-hover);
  border-color: rgba(255,255,255,0.15);
  box-shadow: 0 28px 60px rgba(0,0,0,0.35);
}
.card h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Tools inside cards */
.tool { display: flex; flex-direction: column; gap: 12px; }
.tool input, .tool select, .tool textarea {
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
}
.tool input:focus, .tool select:focus, .tool textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(138,173,244,0.15);
}

/* Button rows */
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-row button {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 10px;
  padding: 8px 14px;
  color: #0b0b14;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-row button:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

/* Results */
.res {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  min-height: 1.4rem;
  word-break: break-word;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

/* QR container */
#qr-box { margin-top: 8px; display: flex; justify-content: center; }
#qr-box img { border-radius: 8px; border: 1px solid var(--border); }

/* Footer */
footer {
  max-width: 1200px;
  margin: 40px auto 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 20px;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .logo { font-size: 1.8rem; }
  body { padding: 16px; }
}