:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --input-bg: #334155;
  --border-color: #475569;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #10b981;
  --primary-hover: #059669;
  --focus-ring: rgba(16, 185, 129, 0.4);
  --error-bg: rgba(244, 63, 94, 0.1);
  --error-text: #f43f5e;
  --font-main: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; }

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  position: relative;
  overflow-x: hidden;
  padding: 2rem 0;
}

.background-glow {
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(16, 185, 129, 0.08) 0%, transparent 50%);
  z-index: -1;
  pointer-events: none;
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 500px;
  margin: 0 20px;
  border: 1px solid var(--border-color);
}

header { text-align: center; margin-bottom: 2rem; }

.icon-wrapper {
  color: var(--primary);
  background: rgba(16, 185, 129, 0.1);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem auto;
}

h1 { margin: 0; font-size: 1.5rem; }
p.subtitle { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.5rem; }

.row { display: flex; gap: 15px; }
.half { flex: 1; min-width: 0; }
.input-group { margin-bottom: 1.25rem; }
.spacer-bottom { margin-bottom: 25px; }

label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}
.sub-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="text"], input[type="url"], input[type="email"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: white;
  border-radius: 8px;
  outline: none;
  font-family: var(--font-main);
  transition: all 0.2s;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.file-upload-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    background: #0b1120;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.icon-preview {
    width: 48px;
    height: 48px;
    background: #1e293b;
    border-radius: 6px;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid #334155;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
    overflow: hidden;
}

input[type="file"] { display: none; }

.custom-file-btn {
    display: inline-block;
    cursor: pointer;
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin: 0;
}

.custom-file-btn:hover { text-decoration: underline; }

#fileName {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-container {
  background: #0b1120;
  border-radius: 8px;
  border: 1px solid #334155;
  margin-bottom: 1.5rem;
}
.preview-header {
  background: #1e293b;
  color: var(--text-muted);
  font-size: 0.7rem;
  text-transform: uppercase;
  padding: 8px 12px;
  font-weight: 600;
  border-bottom: 1px solid #334155;
}
.preview-code { padding: 12px; font-family: var(--font-mono); font-size: 0.8rem; }
.preview-code .key { color: var(--text-muted); margin-right: 10px; display: inline-block; width: 120px; }
.preview-code .val { color: var(--primary); word-break: break-all; }

.warning-box {
    background: var(--error-bg);
    color: var(--error-text);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--error-text);
    font-size: 0.85rem;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 1.5rem;
    animation: fadeIn 0.3s ease;
}
.warning-box.hidden { display: none; }
.warning-box svg { flex-shrink: 0; margin-top: 2px; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.advanced-section { margin-bottom: 1.5rem; }

.toggle-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0;
    width: auto;
    cursor: pointer;
}

.toggle-btn:hover { color: var(--text-main); }
.chevron { transition: transform 0.3s; }
.toggle-btn.open .chevron { transform: rotate(180deg); }

.advanced-content {
    margin-top: 15px;
    padding-left: 10px;
    border-left: 2px solid var(--border-color);
    overflow: hidden;
    transition: max-height 0.4s ease-in-out, opacity 0.3s;
    max-height: 1000px;
    opacity: 1;
}

.advanced-content.hidden { max-height: 0; opacity: 0; margin-top: 0; pointer-events: none; }

.advanced-group {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding-bottom: 1rem;
}
.advanced-group:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.group-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 15px;
    background: rgba(255,255,255,0.03);
    padding: 10px;
    border-radius: 8px;
}

.checkbox-group { display: flex; align-items: center; gap: 10px; margin-bottom: 0; }
.checkbox-group input { width: auto; margin: 0; cursor: pointer; }
.checkbox-group label { margin: 0; cursor: pointer; color: var(--text-main); font-size: 0.85rem; }

.action-btn {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: #064e3b;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: center;
  align-items: center;
}
.action-btn:hover { background: var(--primary-hover); transform: translateY(-1px); }
.action-btn:active { transform: translateY(1px); }
.action-btn:disabled { opacity: 0.7; cursor: not-allowed; }

.loader {
  border: 2px solid rgba(0,0,0,0.1);
  border-left-color: #064e3b;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  animation: spin 1s linear infinite;
  display: none;
  margin-left: 10px;
}
.action-btn.loading .loader { display: block; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 480px) {
    .container { padding: 1.5rem; }
    .row { flex-direction: column; }
    .preview-code .key { width: 100%; display: block; margin-bottom: 2px; }
}

.input-error {
  border-color: var(--error-text) !important;
  animation: shake 0.3s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}