@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;800&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --bg-color: #0b0f19;
  --panel-bg: rgba(17, 24, 39, 0.7);
  --panel-border: rgba(255, 255, 255, 0.08);
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --accent-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --card-hover-gradient: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(29, 78, 216, 0.05) 100%);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent-glow: 0 0 20px rgba(59, 130, 246, 0.4);
}

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

body {
  font-family: 'Outfit', 'Noto Sans KR', 'Inter', sans-serif;
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(at 10% 20%, rgba(29, 78, 216, 0.15) 0px, transparent 50%),
    radial-gradient(at 90% 80%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1000px;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

/* Header Section */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 32px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  animation: fadeInDown 0.6s ease-out;
}

.logo-section h1 {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(to right, #3b82f6, #10b981);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.logo-section p {
  font-size: 13px;
  color: var(--text-secondary);
}

.actions-section {
  display: flex;
  gap: 12px;
}

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
  padding: 12px 24px;
  border-radius: 12px;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Statistics Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  animation: fadeIn 0.8s ease-out;
}

.stat-card {
  padding: 20px 24px;
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
}

/* Main Dashboard Files Panel */
.dashboard-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 400px;
  animation: fadeInUp 0.8s ease-out;
  position: relative; /* Drag/Drop overlay absolute positioning anchor */
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 16px;
}

.panel-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 500px;
  overflow-y: auto;
  padding-right: 4px;
}

/* Custom Scrollbar */
.file-list::-webkit-scrollbar {
  width: 6px;
}
.file-list::-webkit-scrollbar-track {
  background: transparent;
}
.file-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
}
.file-list::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* File Card Items */
.file-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 14px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.file-card:hover {
  background: var(--card-hover-gradient);
  border-color: rgba(59, 130, 246, 0.3);
  transform: scale(1.01) translateY(-2px);
}

.file-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.file-icon {
  width: 44px;
  height: 44px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #3b82f6;
  font-size: 20px;
}

.file-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.file-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: color 0.2s, text-decoration 0.2s;
}

.file-name:hover {
  color: #3b82f6;
  text-decoration: underline;
}

.file-meta {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  gap: 16px;
}

.file-actions {
  display: flex;
  gap: 8px;
}

.btn-action {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-action.active {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
  border-color: rgba(59, 130, 246, 0.4);
}

.btn-action.drag-over {
  background: rgba(59, 130, 246, 0.3) !important;
  border-color: #3b82f6 !important;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.5) !important;
  transform: scale(1.05);
}

.btn-open {
  background: var(--accent-gradient);
  border: none;
  color: white;
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.2);
}

.btn-open:hover {
  background: linear-gradient(135deg, #10b981 0%, #047857 100%);
  box-shadow: 0 6px 14px rgba(16, 185, 129, 0.3);
  transform: translateY(-1px);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 60px 0;
  color: var(--text-secondary);
  text-align: center;
}

.empty-icon {
  font-size: 48px;
  color: var(--text-muted);
}

/* Modal Styling */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(7, 10, 19, 0.7);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 30px;
  width: 90%;
  max-width: 440px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.modal-header p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.form-group label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 12px;
  color: white;
  font-size: 14px;
  outline: none;
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-input:focus {
  border-color: #3b82f6;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}