:root {
    /* Colors and Theming */
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --primary-disabled: #1d4ed8;
    
    --success-bg: rgba(16, 185, 129, 0.2);
    --success-border: #10b981;
    --success-text: #34d399;
    
    --error-bg: rgba(239, 68, 68, 0.2);
    --error-border: #ef4444;
    --error-text: #f87171;
    
    --focus-ring: rgba(59, 130, 246, 0.5);
    
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --border-radius: 16px;
    --transition-speed: 0.25s;

    /* Spacing System */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.25rem;
    --spacing-2xl: 3.5rem;
}

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

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, hsla(225,39%,30%,0.2) 0, transparent 50%), 
        radial-gradient(at 100% 0%, hsla(339,49%,30%,0.2) 0, transparent 50%);
    color: var(--text-main);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
    -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Container */
.app-container {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 20px;
    width: 100%;
    max-width: 700px;
    padding: var(--spacing-2xl);
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    margin: 2rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  padding-bottom: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--card-border);
  gap: var(--spacing-lg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.header-icon {
    font-size: 2.75rem;
    filter: drop-shadow(0 0 10px rgba(255, 107, 0, 0.3));
}

.header-text h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: #ffffff;
}

.header-text p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-xl);
}

.setup-required .main-content {
    display: none;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-speed);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
  color: white;
}

.btn-secondary-outline {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #e2e8f0;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(8px);
}

.btn-secondary-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Modal Popup Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(2, 6, 23, 0.85); /* Darker backdrop */
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-content {
    background: linear-gradient(135deg, rgba(30, 41, 59, 1) 0%, rgba(15, 23, 42, 1) 100%);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    width: 90%;
    max-width: 1000px;
    padding: 2.5rem;
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.05) inset,
        0 20px 50px -12px rgba(0, 0, 0, 0.8),
        0 0 30px 0 rgba(59, 130, 246, 0.1);
    animation: modalEntrance 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

/* Subtle gradient glow behind the modal content */
.modal-content::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

@keyframes modalEntrance {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 1.25rem;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-close {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 10px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-close:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.2);
    transform: rotate(90deg);
}

.modal-content .form-group {
    position: relative;
    z-index: 1;
}

.modal-content textarea {
    min-height: 320px; /* Increased from 250px */
}

.modal-content textarea, 
.modal-content input[type="text"] {
    color: var(--text-main);
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(2, 6, 23, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
    width: 100%;
    border-radius: 8px;
}

.modal-content textarea:focus, 
.modal-content input[type="text"]:focus {
    background: rgba(2, 6, 23, 0.6);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15), inset 0 2px 4px rgba(0,0,0,0.2);
}

.modal-content .btn-primary {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.modal-content .btn-primary::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.modal-content .btn-primary:hover::after {
    opacity: 1;
}

.form-group {
    margin-bottom: var(--spacing-xl);
    animation: revealIn 0.5s ease-out backwards;
}

label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: #e2e8f0;
    letter-spacing: 0.01em;
}

.label-with-action {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.label-with-action label {
    margin-bottom: 0;
}

.btn-action-small {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--primary-color);
    width: 24px;
    height: 24px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    line-height: 1;
    transition: all 0.2s ease;
}

.btn-action-small:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.btn-action-small .hidden {
    display: none;
}

#new-doc-input-wrapper input {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.75rem 1rem;
    transition: all var(--transition-speed);
}

#new-doc-input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

#deep-level-group {
    background: rgba(59, 130, 246, 0.03);
    border-left: 2px solid var(--primary-color);
    padding: 1.25rem;
    border-radius: 0 12px 12px 0;
    margin-top: -0.5rem;
    margin-bottom: 2rem;
    animation: slideInLeft 0.3s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

#deep-level-group input {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.75rem 1rem;
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: "▼";
    font-size: 0.7rem;
    color: var(--text-muted);
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

select option:disabled {
    color: var(--primary-color);
    font-weight: 600;
    background: rgba(15, 23, 42, 0.9);
}

select, textarea {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-family);
    font-size: 1rem;
    padding: 0.75rem 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
    appearance: none;
}

select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
    resize: vertical;
    min-height: 250px;
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

textarea::placeholder {
    color: #475569;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.input-row {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
}

.input-row > div {
  display: flex;
  flex-direction: column;
}

.help-text {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.error-message {
    color: var(--error-text);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    min-height: 20px;
    display: none;
}

.error-message.visible {
    display: block;
    animation: fadeIn 0.3s;
}

/* Button */
.action-area {
    margin-top: 2rem;
}

.btn-primary {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-primary:disabled {
    background-color: var(--primary-disabled);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-danger {
    background-color: transparent;
    color: var(--error-text);
    border: 1px solid var(--error-border);
    border-radius: 8px;
    padding: 0.875rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-danger:hover {
    background-color: var(--error-bg);
    color: white;
}

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-left: 10px;
}

.hidden {
    display: none !important;
}

.reveal-animation {
    animation: revealIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes revealIn {
    from { 
        opacity: 0; 
        transform: translateY(10px);
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
    }
}

/* Sparkle Celebration */
.sparkle {
    position: fixed;
    pointer-events: none;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    z-index: 9999;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    animation: sparkleExplosion 1s cubic-bezier(0, 0, 0.2, 1) forwards;
}

@keyframes sparkleExplosion {
    0% {
        transform: translate(0, 0) scale(0);
        opacity: 1;
    }
    100% {
        transform: translate(var(--x), var(--y)) scale(1.5);
        opacity: 0;
    }
}

/* Toast Container */
.toast-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 1000;
}

.toast {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease-out forwards;
    max-width: 350px;
}

.toast.removing {
    animation: slideOut 0.3s ease-in forwards;
}

.toast.success {
    border-left: 4px solid var(--success-border);
}

.toast.error {
    border-left: 4px solid var(--error-border);
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-content {
    display: flex;
    flex-direction: column;
    padding-top: 0.1rem;
}

.toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.toast.success .toast-title { color: var(--success-text); }
.toast.error .toast-title { color: var(--error-text); }

.toast-message {
    font-size: 0.85rem;
    color: var(--text-main);
    line-height: 1.4;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* Data Explorer & Tree View */
.explorer-section {
    margin-top: 1rem;
    animation: fadeIn 0.6s ease-out;
}

.explorer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.explorer-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 0.025em;
}

.tree-container {
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    min-height: 100px;
    max-height: 500px;
    overflow-y: auto;
    font-family: 'Menlo', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
}

.tree-node {
    margin-left: 1.5rem;
    position: relative;
    user-select: none;
}

.tree-node::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: rgba(255, 255, 255, 0.05);
}

.tree-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: default;
    transition: background 0.2s;
}

.tree-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.tree-toggle {
    cursor: pointer;
    font-size: 0.7rem;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.tree-toggle.expanded {
    transform: rotate(90deg);
}

.tree-icon {
    font-size: 0.9rem;
}

.tree-key {
    color: #94a3b8;
    font-weight: 500;
}

.tree-value {
    color: #34d399; /* Success green for values */
    word-break: break-all;
}

.tree-value.string { color: #facc15; } /* Yellow for strings */
.tree-value.number { color: #38bdf8; } /* Blue for numbers */
.tree-value.boolean { color: #f472b6; } /* Pink for booleans */

.tree-children {
    display: none;
}

.tree-children.visible {
    display: block;
    animation: slideDown 0.2s ease-out;
}

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

.empty-tree-msg {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 1.5rem;
        border-radius: 0;
        min-height: 100vh;
        border: none;
    }
    
    body {
        padding: 0;
    }
    
    .toast-container {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
    
    .toast {
        max-width: 100%;
    }
}