/* ================================
   九宫格切图工具 - 自定义样式
   配色与 Leowh 主页统一
   ================================ */

:root {
  --bg: #FAFAF9;
  --bg-alt: #F5F5F4;
  --surface: #FFFFFF;
  --border: #E7E5E4;
  --border-strong: #D6D3D1;
  --text: #1E293B;
  --text-secondary: #52525B;
  --text-muted: #71717A;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: rgba(79, 70, 229, 0.08);
  --secondary: #F97316;
  --accent: #EC4899;
  --success: #059669;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Toast ── */
.toast {
  position: fixed; top: 24px; right: 24px;
  background: var(--text); color: var(--bg);
  padding: 10px 18px; border-radius: 100px;
  font-size: 14px; font-weight: 500;
  display: flex; align-items: center; gap: 8px;
  z-index: 1000;
  transform: translateX(calc(100% + 40px));
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.toast.show { transform: translateX(0); }
.toast-dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; }

/* ── Page ── */
.page { max-width: 960px; margin: 0 auto; padding: 0 32px; }

/* ── Header scroll effect ── */
#header.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

/* ── Custom scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f5f9; }
::-webkit-scrollbar-thumb { background: #A5B4FC; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4F46E5; }

::selection { background: rgba(79, 70, 229, 0.2); color: #1E293B; }

/* ══════════════════════════════════════════
   Upload Area
   ══════════════════════════════════════════ */
.upload-area {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}
.upload-area:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.upload-area.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(79,70,229,0.1);
}
.upload-icon {
  width: 48px; height: 48px;
  margin: 0 auto 16px;
  color: var(--text-muted);
}
.upload-text {
  font-size: 16px; font-weight: 600; color: var(--text); margin-bottom: 8px;
}
.upload-hint {
  font-size: 13px; color: var(--text-muted);
}

/* ══════════════════════════════════════════
   Main Layout
   ══════════════════════════════════════════ */
.tool-section {
  padding: 24px 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.preview-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.preview-canvas-wrap {
  position: relative;
  width: 100%;
  max-height: 500px;
  overflow: auto;
  background: #f5f5f5;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  min-height: 300px;
}
.preview-canvas-wrap canvas {
  max-width: 100%;
  display: block;
}

.control-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 16px;
}

.control-title {
  font-size: 16px; font-weight: 700; color: var(--text);
  padding-bottom: 12px; border-bottom: 1px solid var(--border);
}

/* ══════════════════════════════════════════
   Form Elements
   ══════════════════════════════════════════ */
.form-group {
  display: flex; flex-direction: column; gap: 6px;
}
.form-group label {
  font-size: 13px; font-weight: 600; color: var(--text-secondary);
}
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select {
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit; font-size: 14px; color: var(--text);
  transition: all 0.2s ease; outline: none;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.form-group input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
}
.form-group input[type="color"] {
  width: 40px; height: 40px; border: 2px solid var(--border); border-radius: var(--radius);
  cursor: pointer; padding: 2px;
}
.range-row {
  display: flex; align-items: center; gap: 10px;
}
.range-row input[type="range"] { flex: 1; }
.range-value {
  min-width: 48px; font-size: 13px; font-weight: 600; color: var(--primary);
}

/* ══════════════════════════════════════════
   Buttons
   ══════════════════════════════════════════ */
.btn-primary {
  padding: 12px 24px;
  background: var(--primary);
  border: none; border-radius: 100px;
  font-family: inherit; font-size: 14px; font-weight: 600;
  color: white; cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.10); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  padding: 10px 20px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.15s ease;
}
.btn-secondary:hover { background: var(--primary-light); border-color: rgba(79,70,229,0.25); color: var(--primary); }

.btn-outline {
  padding: 10px 20px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit; font-size: 13px; font-weight: 500;
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.15s ease;
}
.btn-outline:hover { background: var(--primary-light); border-color: rgba(79,70,229,0.25); color: var(--primary); }

.btn-group {
  display: flex; flex-wrap: wrap; gap: 8px;
}

/* ══════════════════════════════════════════
   Image Grid (九宫格)
   ══════════════════════════════════════════ */
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
  background: var(--primary);
  border-radius: var(--radius);
  overflow: hidden;
  max-height: 500px;
}
.grid-cell {
  position: relative;
  aspect-ratio: 1;
  background: #fff;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s ease;
}
.grid-cell:hover { filter: brightness(0.9); }
.grid-cell canvas { width: 100%; height: 100%; object-fit: cover; }
.grid-cell-number {
  position: absolute;
  top: 4px; left: 4px;
  background: rgba(0,0,0,0.5); color: white;
  width: 22px; height: 22px; border-radius: 50%;
  font-size: 11px; display: flex; align-items: center; justify-content: center;
  pointer-events: none;
}

/* ══════════════════════════════════════════
   Guide Section (accordion)
   ══════════════════════════════════════════ */
.guide-section {
  margin-top: 16px;
  margin-bottom: 64px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.guide-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 20px;
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.guide-toggle:hover { background: var(--bg-alt); }
.guide-toggle-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 600; color: #1E293B;
}
.guide-toggle.open .toggle-arrow { transform: rotate(180deg); }
.toggle-arrow { transition: transform 0.2s ease; color: var(--text-muted); }
.guide-list { padding: 0 20px 20px; }
.guide-list.hidden { display: none; }
.guide-item {
  padding: 16px 0; border-top: 1px solid var(--border);
}
.guide-item:first-child { border-top: 1px solid var(--border); }
.guide-item-title {
  font-size: 14px; font-weight: 600; color: #1E293B; margin-bottom: 6px;
}
.guide-item-body {
  font-size: 13px; color: var(--text-secondary); line-height: 1.8;
}
.guide-item-body kbd {
  padding: 1px 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-family: 'SF Mono', 'Cascadia Code', monospace;
  font-size: 12px; color: var(--text-secondary);
}

/* ══════════════════════════════════════════
   Responsive
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .page { padding: 0 16px; }
  .tool-grid { grid-template-columns: 1fr; }
  .grid-container { max-height: 400px; }
  .upload-area { padding: 32px 20px; }
}