:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --bg-input: #0f172a;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    --radius: 12px;
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

header {
    text-align: center;
    padding: 3rem 0 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--primary), #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.mode-badges {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.human { background: rgba(34, 197, 94, 0.15); color: var(--success); border: 1px solid rgba(34, 197, 94, 0.3); }
.badge.ai { background: rgba(99, 102, 241, 0.15); color: var(--primary-light); border: 1px solid rgba(99, 102, 241, 0.3); }
.badge.java { background: rgba(245, 158, 11, 0.15); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.3); }

.status-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin: 1.5rem 0;
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 0.9rem;
}

.client-id-badge {
    margin-left: auto;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: #fff;
    border-radius: 999px;
    font-size: 0.8rem;
    font-family: 'Fira Code', 'Consolas', monospace;
    letter-spacing: 0.03em;
}

.client-id-badge:empty {
    display: none;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--error);
    animation: pulse 2s infinite;
}

.status-dot.connected {
    background: var(--success);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* --- Tools Grid --- */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tool-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.15);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.tool-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.tool-icon.calculator { background: rgba(99, 102, 241, 0.15); }
.tool-icon.text { background: rgba(236, 72, 153, 0.15); }
.tool-icon.datetime { background: rgba(245, 158, 11, 0.15); }
.tool-icon.color { background: rgba(34, 197, 94, 0.15); }
.tool-icon.hash { background: rgba(59, 130, 246, 0.15); }
.tool-icon.json { background: rgba(168, 85, 247, 0.15); }
.tool-icon.password { background: rgba(239, 68, 68, 0.15); }
.tool-icon.qr { background: rgba(20, 184, 166, 0.15); }

.tool-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.tool-name {
    font-size: 0.75rem;
    color: var(--primary-light);
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    display: inline-block;
}

.tool-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

/* --- Form Elements --- */
.tool-form {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.tool-input, .tool-textarea, .tool-select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-family: 'Cascadia Code', 'Fira Code', 'Inter', monospace;
    font-size: 0.85rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.tool-input:focus, .tool-textarea:focus, .tool-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.tool-input::placeholder, .tool-textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.tool-textarea {
    resize: vertical;
    min-height: 50px;
}

.tool-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.tool-select option {
    background: var(--bg-card);
    color: var(--text);
}

.tool-input-sm {
    width: 70px;
    text-align: center;
}

.input-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.input-row .tool-input {
    flex: 1;
}

.input-row .tool-select {
    flex: 1;
}

.checkbox-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.checkbox-row label {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
    accent-color: var(--primary);
    width: 15px;
    height: 15px;
    cursor: pointer;
}

.inline-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.tool-color-picker {
    width: 40px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    padding: 2px;
    background: var(--bg-input);
    flex-shrink: 0;
}

.tool-btn {
    padding: 0.6rem 1.2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
    font-family: 'Inter', sans-serif;
}

.tool-btn:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.tool-btn:active {
    transform: scale(0.97);
}

.tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tool-btn.loading {
    position: relative;
    color: transparent;
}

.tool-btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    margin: -8px 0 0 -8px;
    animation: spin 0.6s linear infinite;
}

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

/* --- Result Area --- */
.tool-result {
    margin-top: 0.6rem;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.tool-result.visible {
    max-height: 400px;
    padding: 0.75rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow-y: auto;
}

.tool-result pre {
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 0.8rem;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.5;
    color: var(--success);
    margin: 0;
}

.tool-result .result-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.tool-result .result-error {
    color: var(--error);
}

.tool-result .result-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 0.3rem;
    word-break: break-all;
}

.tool-result .result-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.tool-result .color-preview {
    display: inline-block;
    width: 24px;
    height: 24px;
    border-radius: 6px;
    border: 2px solid var(--border);
    vertical-align: middle;
    margin-right: 6px;
}

.tool-result .copy-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    cursor: pointer;
    margin-left: 6px;
    transition: all 0.2s;
}

.tool-result .copy-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

.dt-extra-fields {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* --- Activity Log --- */
.activity-log {
    margin-top: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.activity-log h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.log-source-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.log-entries {
    max-height: 300px;
    overflow-y: auto;
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 0.8rem;
}

.log-entry {
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.25rem;
    display: flex;
    gap: 0.75rem;
    align-items: baseline;
}

.log-entry:hover {
    background: rgba(255, 255, 255, 0.03);
}

.log-time {
    color: var(--text-muted);
    flex-shrink: 0;
    font-size: 0.75rem;
}

.log-type {
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    flex-shrink: 0;
}

.log-type.call { background: rgba(59, 130, 246, 0.2); color: var(--info); }
.log-type.result { background: rgba(34, 197, 94, 0.2); color: var(--success); }
.log-type.error { background: rgba(239, 68, 68, 0.2); color: var(--error); }
.log-type.info { background: rgba(245, 158, 11, 0.2); color: var(--warning); }
.log-type.human { background: rgba(34, 197, 94, 0.2); color: var(--success); }

.log-message {
    color: var(--text);
    word-break: break-all;
}

.log-entries::-webkit-scrollbar {
    width: 6px;
}

.log-entries::-webkit-scrollbar-track {
    background: transparent;
}

.log-entries::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.tool-result::-webkit-scrollbar {
    width: 5px;
}

.tool-result::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
}

footer a {
    color: var(--primary-light);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    header h1 { font-size: 1.8rem; }
    .tools-grid { grid-template-columns: 1fr; }
    .container { padding: 1rem; }
    .input-row { flex-wrap: wrap; }
    .checkbox-row { gap: 0.5rem; }
}