/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-base: #0a0a0f;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.06);
  --bg-input: rgba(255,255,255,0.05);
  --bg-input-focus: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.08);
  --border-focus: rgba(139,92,246,0.6);
  --text-primary: #f1f0ff;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent: #7c3aed;
  --accent-light: #8b5cf6;
  --accent-glow: rgba(124,58,237,0.3);
  --success: #10b981;
  --success-glow: rgba(16,185,129,0.25);
  --error: #ef4444;
  --error-glow: rgba(239,68,68,0.25);
  --warning: #f59e0b;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(124,58,237,0.15);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Background Effects ===== */
.bg-grid {
  position: fixed; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(124,58,237,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.bg-glow {
  position: fixed; z-index: 0; border-radius: 50%;
  pointer-events: none; filter: blur(80px); opacity: 0.4;
}
.bg-glow-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(124,58,237,0.25) 0%, transparent 70%);
  top: -200px; right: -100px;
  animation: glow-drift 12s ease-in-out infinite alternate;
}
.bg-glow-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(16,185,129,0.15) 0%, transparent 70%);
  bottom: 10%; left: -100px;
  animation: glow-drift 16s ease-in-out infinite alternate-reverse;
}
@keyframes glow-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(40px, 30px) scale(1.1); }
}

/* ===== Header ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 900px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), #5b21b6);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 20px var(--accent-glow);
}
.logo-icon svg { width: 18px; height: 18px; color: white; }
.logo-text { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.logo-badge {
  font-size: 0.65rem; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), #ec4899);
  color: white; padding: 2px 8px; border-radius: 20px;
  letter-spacing: 0.05em; text-transform: uppercase;
}

.status-indicator { display: flex; align-items: center; gap: 8px; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-muted);
  transition: background var(--transition), box-shadow var(--transition);
}
.status-dot.online { background: var(--success); box-shadow: 0 0 8px var(--success-glow); }
.status-dot.error { background: var(--error); box-shadow: 0 0 8px var(--error-glow); }
.status-text { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== Main Layout ===== */
.main { position: relative; z-index: 1; padding: 32px 24px 80px; }
.container {
  max-width: 900px; margin: 0 auto;
  display: flex; flex-direction: column; gap: 20px;
}

/* ===== Cards ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: border-color var(--transition), box-shadow var(--transition);
  animation: card-in 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
}
@keyframes card-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.card:hover { border-color: rgba(255,255,255,0.12); }

.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  cursor: default;
}
.config-card .card-header { cursor: pointer; user-select: none; }
.config-card .card-header:hover { background: var(--bg-card-hover); }

.card-title {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 0.95rem;
}
.card-title svg { width: 18px; height: 18px; color: var(--accent-light); }

.config-toggle svg { width: 20px; height: 20px; color: var(--text-muted); transition: transform var(--transition); }
.config-toggle.open svg { transform: rotate(180deg); }

/* ===== Config Body ===== */
.config-body { padding: 24px; animation: slide-down 0.2s ease; }
@keyframes slide-down {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Compose Body ===== */
.compose-body { padding: 24px; display: flex; flex-direction: column; gap: 20px; }

/* ===== Form Elements ===== */
.form-row { display: flex; gap: 16px; }
@media (max-width: 640px) { .form-row { flex-direction: column; } }

.form-group { display: flex; flex-direction: column; gap: 8px; flex: 1; }

.form-label {
  font-size: 0.82rem; font-weight: 600;
  color: var(--text-secondary); text-transform: uppercase;
  letter-spacing: 0.08em;
}
.form-label .optional {
  font-weight: 400; text-transform: none; letter-spacing: 0;
  color: var(--text-muted); font-size: 0.78rem;
}

.form-input, .form-textarea {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 10px 14px;
  outline: none;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form-input:hover, .form-textarea:hover { border-color: rgba(255,255,255,0.15); }
.form-input:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.12), inset 0 1px 3px rgba(0,0,0,0.2);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-muted); }
.input-locked {
  color: var(--accent-light);
  cursor: not-allowed;
  opacity: 0.75;
  border-style: dashed;
}
.input-locked:hover, .input-locked:focus {
  border-color: var(--border) !important;
  background: var(--bg-input) !important;
  box-shadow: none !important;
}

.form-textarea {
  resize: vertical; min-height: 200px;
  line-height: 1.6;
}

.code-editor {
  font-family: var(--font-mono);
  font-size: 0.83rem;
}

.form-hint { font-size: 0.76rem; color: var(--text-muted); }
.form-hint code {
  font-family: var(--font-mono); font-size: 0.74rem;
  background: rgba(255,255,255,0.07); padding: 1px 5px;
  border-radius: 4px; color: var(--accent-light);
}
.form-hint strong { color: var(--text-secondary); font-weight: 600; }

/* ===== Recipient List ===== */
.recipient-list { display: flex; flex-direction: column; gap: 8px; }
.recipient-item {
  display: flex; gap: 8px; align-items: center;
  animation: fade-in-up 0.2s ease both;
}
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.recipient-input { flex: 1; }

.recipient-btn {
  flex-shrink: 0; width: 36px; height: 36px;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg-input); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition); color: var(--text-muted);
}
.recipient-btn-remove:hover {
  background: rgba(239,68,68,0.15);
  border-color: rgba(239,68,68,0.4);
  color: var(--error);
}
.recipient-btn svg { width: 14px; height: 14px; }

.add-recipient-btn {
  align-self: flex-start; margin-top: 4px;
}

/* ===== Optional Toggles ===== */
.optional-toggles { display: flex; gap: 8px; flex-wrap: wrap; }
.toggle-chip {
  font-size: 0.78rem; font-weight: 500;
  padding: 5px 12px; border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-input); color: var(--text-secondary);
  cursor: pointer; transition: all var(--transition);
}
.toggle-chip:hover, .toggle-chip.active {
  background: var(--accent-glow);
  border-color: var(--border-focus);
  color: var(--accent-light);
}

/* ===== Format Tabs ===== */
.format-tabs {
  display: flex; gap: 4px; padding: 4px;
  background: var(--bg-input); border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  width: fit-content;
  margin-bottom: 12px;
}
.format-tab {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 16px; border-radius: 6px;
  font-size: 0.82rem; font-weight: 500;
  border: none; background: transparent;
  color: var(--text-muted); cursor: pointer;
  transition: all var(--transition);
}
.format-tab svg { width: 14px; height: 14px; }
.format-tab:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.format-tab.active {
  background: linear-gradient(135deg, var(--accent), #5b21b6);
  color: white;
  box-shadow: 0 2px 12px var(--accent-glow);
}

/* ===== Rich Text Toolbar ===== */
.rich-toolbar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 4px;
  padding: 8px 12px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.toolbar-group { display: flex; align-items: center; gap: 2px; }
.toolbar-sep { width: 1px; height: 20px; background: var(--border); margin: 0 4px; }

.toolbar-btn {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px; border: none;
  background: transparent; color: var(--text-secondary);
  cursor: pointer; font-size: 0.85rem;
  transition: all var(--transition);
}
.toolbar-btn svg { width: 14px; height: 14px; }
.toolbar-btn:hover { background: rgba(255,255,255,0.08); color: var(--text-primary); }

.toolbar-select {
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-secondary);
  font-size: 0.78rem; padding: 4px 8px;
  cursor: pointer; outline: none;
  transition: border-color var(--transition);
}
.toolbar-select:hover { border-color: rgba(255,255,255,0.2); }
.toolbar-select option { background: #1a1a2e; }

.color-picker {
  width: 30px; height: 30px; border-radius: 6px;
  border: 1px solid var(--border); cursor: pointer;
  padding: 2px; background: var(--bg-input);
}

/* ===== Rich Editor ===== */
.rich-editor {
  min-height: 200px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm) !important;
  cursor: text;
  outline: none;
}
.rich-editor:focus { border-color: var(--border-focus) !important; }
.editor-container { position: relative; }

/* ===== Preview ===== */
.preview-section {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  animation: fade-in-up 0.25s ease both;
}
.preview-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem; font-weight: 500; color: var(--text-secondary);
}
.preview-frame-container { background: #fff; }
.preview-frame { width: 100%; height: 300px; border: none; }

/* ===== Compose Actions ===== */
.compose-actions {
  display: flex; align-items: center; justify-content: flex-end;
  gap: 12px; padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.88rem; font-weight: 500;
  border: none; cursor: pointer;
  transition: all var(--transition);
  text-decoration: none; white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #5b21b6);
  color: white;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(124,58,237,0.45);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
  opacity: 0.5; cursor: not-allowed; transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--bg-input); border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-secondary:hover { background: var(--bg-input-focus); color: var(--text-primary); border-color: rgba(255,255,255,0.2); }

.btn-ghost {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-ghost:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-sm svg { width: 14px; height: 14px; }

/* ===== Sending State ===== */
.btn-sending {
  position: relative; overflow: hidden;
}
.btn-sending::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
  animation: shimmer 1.2s infinite;
}
@keyframes shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

/* ===== Response Card ===== */
.response-card { animation: card-in 0.35s cubic-bezier(0.4,0,0.2,1) both; }
.response-body { padding: 0; }
.response-meta {
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  font-size: 0.8rem; color: var(--text-secondary);
}
.response-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 600;
}
.response-badge.success { background: var(--success-glow); color: var(--success); }
.response-badge.error { background: var(--error-glow); color: var(--error); }
.response-badge.warning { background: rgba(245,158,11,0.2); color: var(--warning); }

.response-json {
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: #a5b4fc;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ===== History ===== */
.history-list { padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.history-item {
  padding: 12px 16px;
  background: var(--bg-input); border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: flex; align-items: center; gap: 12px;
  cursor: pointer; transition: all var(--transition);
  animation: fade-in-up 0.2s ease both;
}
.history-item:hover { background: var(--bg-input-focus); border-color: rgba(255,255,255,0.15); }
.history-status { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.history-status.ok { background: var(--success); }
.history-status.fail { background: var(--error); }
.history-details { flex: 1; min-width: 0; }
.history-subject { font-size: 0.88rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }
.history-time { font-size: 0.75rem; color: var(--text-muted); flex-shrink: 0; font-family: var(--font-mono); }

/* ===== Toast Notifications ===== */
.toast-container {
  position: fixed; bottom: 24px; right: 24px;
  display: flex; flex-direction: column; gap: 8px;
  z-index: 200; pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: rgba(20,20,30,0.95);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex; align-items: center; gap: 10px;
  font-size: 0.85rem; color: var(--text-primary);
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
  backdrop-filter: blur(16px);
  max-width: 360px;
  animation: toast-in 0.3s cubic-bezier(0.4,0,0.2,1) both;
}
@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px) scale(0.95); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}
.toast.out { animation: toast-out 0.25s ease forwards; }
@keyframes toast-out {
  to { opacity: 0; transform: translateX(20px) scale(0.9); }
}
.toast-icon { width: 18px; height: 18px; flex-shrink: 0; }
.toast-success .toast-icon { color: var(--success); }
.toast-error .toast-icon { color: var(--error); }
.toast-info .toast-icon { color: var(--accent-light); }
.toast-warning .toast-icon { color: var(--warning); }