:root {
  --bg-color: #0b0f19;
  --card-bg: rgba(20, 27, 45, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-glow: rgba(59, 130, 246, 0.35);
  --accent: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
  --success: #10b981;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --font: 'Outfit', 'Noto Sans SC', -apple-system, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
}

.background-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(139, 92, 246, 0.08) 50%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.app-container {
  width: 100%;
  max-width: 900px;
  padding: 32px 20px 80px;
  position: relative;
  z-index: 1;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--card-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.brand-icon svg {
  width: 24px;
  height: 24px;
}

.brand-text h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(180deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text .subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 10px;
}

/* Cards */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transition: all 0.3s ease;
}

.input-header {
  margin-bottom: 14px;
}

.input-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.input-header .tip {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.input-header code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  color: #93c5fd;
}

textarea {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 14px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

textarea:focus, input[type="text"]:focus, input[type="password"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
}

.pwd-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pwd-input-wrap input {
  width: 90px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  color: var(--text-main);
  text-align: center;
  font-weight: 600;
  outline: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  user-select: none;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-gradient {
  background: var(--accent-gradient);
  color: #fff;
}

.btn-gradient:hover {
  opacity: 0.95;
  box-shadow: 0 4px 18px rgba(139, 92, 246, 0.4);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--card-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Results & File List */
.result-header, .links-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--card-border);
}

.result-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.badge {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  font-size: 0.8rem;
  padding: 3px 8px;
  border-radius: 20px;
}

.batch-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  user-select: none;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: background 0.2s;
}

.file-item:hover {
  background: rgba(30, 41, 59, 0.5);
}

.file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.file-name {
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 450px;
}

.file-size {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Links & Dlinks cards */
.dlink-item {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 12px;
}

.dlink-item:last-child {
  margin-bottom: 0;
}

.dlink-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.dlink-name {
  font-weight: 600;
  color: #34d399;
}

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

.tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
}

.tag-success {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}

.modal-dialog {
  position: relative;
  background: #131b2e;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 520px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--card-border);
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.btn-close:hover {
  color: #fff;
}

.modal-body {
  padding: 24px;
  max-height: 70vh;
  overflow-y: auto;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
}

.form-group .required {
  color: #ef4444;
}

.form-group input {
  width: 100%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-main);
  outline: none;
}

.form-group small {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.rpc-input-group {
  display: flex;
  gap: 8px;
}

.divider {
  border: none;
  border-top: 1px solid var(--card-border);
  margin: 18px 0;
}

.modal-footer {
  padding: 16px 24px;
  background: rgba(15, 23, 42, 0.4);
  border-top: 1px solid var(--card-border);
  display: flex;
  justify-content: flex-end;
}

/* Spinner & Toast */
.spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #1e293b;
  border: 1px solid var(--card-border);
  color: #fff;
  padding: 10px 20px;
  border-radius: 30px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  font-size: 0.9rem;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Auth & User UI */
.auth-tab {
  transition: all 0.2s ease;
  user-select: none;
}
.auth-tab.active {
  color: #fff !important;
  border-bottom-color: var(--primary) !important;
}
.auth-tab:hover:not(.active) {
  color: #cbd5e1 !important;
}

.history-chip {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.history-chip:hover {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(96, 165, 250, 0.4);
  color: #93c5fd;
}