/* ==========================================================================
   Unified Hero Demo — AI Rewrite + Scratchpad
   ========================================================================== */
.ud-demo {
    position: relative;
    max-width: 960px;
    margin: 40px auto 0;
    min-height: 520px;
}

/* ---- Phase 1: Editor + AI ---- */
.ud-editor {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    opacity: 1;
    transition: opacity 0.5s ease;
    position: absolute;
    top: 0; left: 0; right: 0;
}
.ud-editor.ud-hide { opacity: 0; pointer-events: none; }

.ud-text-ed {
    flex: 0 0 380px;
    background: #2d2d2d;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 16px 48px rgba(0,0,0,0.4);
}
body.day-theme .ud-text-ed {
    background: #fff;
    box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}

.ud-bar {
    background: #1e1e1e;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
body.day-theme .ud-bar { background: #f5f5f5; border-bottom: 1px solid #e0e0e0; }

.ud-bar-title { font-size: 11px; color: var(--text-muted); margin-left: auto; }

.ud-body {
    padding: 16px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-primary);
}
.ud-body p { margin-bottom: 10px; }

/* Text selection */
.ud-select {
    border-radius: 2px;
    transition: background 0.3s ease;
    padding: 1px 2px;
    margin: -1px -2px;
}
.ud-select.ud-selecting { background: rgba(74,158,255,0.3); }
.ud-select.ud-selected { background: rgba(74,158,255,0.3); }

/* Keyboard Ctrl+` position override */
#kb-ctrl {
    top: 40%; left: 35%;
}

/* AI window */
.ud-ai {
    flex: 1; max-width: 480px;
    background: #2d2d2d;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 16px 48px rgba(0,0,0,0.4);
    opacity: 0;
    transform: scale(0.95) translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}
body.day-theme .ud-ai { background: #fff; box-shadow: 0 16px 48px rgba(0,0,0,0.12); }
.ud-ai.ud-show { opacity: 1; transform: scale(1) translateY(0); }

.ud-ai-body { padding: 0; display: flex; flex-direction: column; height: 300px; }

.ud-chat { flex: 1; overflow-y: auto; padding: 14px 14px 8px; }

.ud-msg {
    display: flex; gap: 10px; margin-bottom: 12px;
    opacity: 0; transform: translateY(8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.ud-msg.ud-show { opacity: 1; transform: translateY(0); }
.ud-msg.ud-user { flex-direction: row-reverse; }

.ud-avatar {
    width: 28px; height: 28px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 7px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; flex-shrink: 0;
}

.ud-bubble {
    font-size: 12px; line-height: 1.6;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    border-radius: 8px; padding: 8px 12px;
    max-width: 85%;
}
body.day-theme .ud-bubble { background: rgba(0,0,0,0.04); }
.ud-user .ud-bubble { background: rgba(74,158,255,0.15); color: var(--text-primary); }

/* Input — reuses .input-section from styles.css */
/* Input area — flexbox, button outside input */
.ud-input-area {
    flex-shrink: 0;
    padding: 8px 14px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.ud-input-area input {
    flex: 1;
    background: #1e1e1e;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 13px;
    color: var(--text-secondary);
    outline: none;
}
body.day-theme .ud-input-area input {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    color: #333;
}
.ud-send {
    width: 32px;
    height: 32px;
    background: var(--accent-blue);
    border: none;
    border-radius: 8px;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.15s ease, box-shadow 0.15s ease;
}
.ud-send.ud-send-glow {
    background: #5ba8ff;
    box-shadow: 0 0 12px rgba(74,158,255,0.5);
}
.ud-send.ud-send-press {
    background: #2a6abf;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
    transform: scale(0.85);
}


/* ---- Phase 2: Scratchpad ---- */
.ud-pad {
    position: absolute; top: 0; left: 0; right: 0;
    background: #2d2d2d; border-radius: 12px; overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    opacity: 0; transform: scale(0.95);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
body.day-theme .ud-pad { background: #fff; box-shadow: 0 20px 60px rgba(0,0,0,0.15); }
.ud-pad.ud-show { opacity: 1; transform: scale(1); }

.ud-toolbar {
    background: #1e1e1e; padding: 8px 14px;
    display: flex; align-items: center; gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,0.05); flex-wrap: wrap;
}
body.day-theme .ud-toolbar { background: #f5f5f5; border-bottom: 1px solid #e0e0e0; }

.ud-dots { display: flex; gap: 6px; margin-right: 12px; }
.ud-dots span { width: 10px; height: 10px; border-radius: 50%; }
.ud-dots span:nth-child(1) { background: #ff5f56; }
.ud-dots span:nth-child(2) { background: #ffbd2e; }
.ud-dots span:nth-child(3) { background: #27c93f; }

.ud-tab {
    padding: 5px 12px; font-size: 11px; color: var(--text-muted);
    background: transparent; border: none; border-radius: 5px;
    cursor: default; transition: all 0.2s; white-space: nowrap;
}
.ud-tab.ud-active { color: var(--accent-orange); background: rgba(255,152,0,0.12); }
.ud-tab.ud-tab-glow { color: var(--accent-orange); background: rgba(255,152,0,0.25); box-shadow: 0 0 8px rgba(255,152,0,0.3); }
.ud-tab.ud-tab-press { transform: scale(0.9); transition: transform 0.1s ease; }

.ud-sep { width: 1px; height: 16px; background: var(--border-color); margin: 0 4px; }

.ud-content { display: flex; min-height: 420px; }

.ud-doc {
    flex: 0 0 45%; padding: 16px;
    border-right: 1px solid var(--border-color);
    font-size: 12px; line-height: 1.8; color: var(--text-primary);
}
.ud-doc-date { font-size: 10px; color: var(--text-muted); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.ud-doc-text { opacity: 0; transform: translateY(8px); transition: opacity 0.5s ease, transform 0.5s ease; }
.ud-doc-text.ud-show { opacity: 1; transform: translateY(0); }

.ud-panel { flex: 1; padding: 16px; overflow-y: auto; position: relative; }

/* Summary */
.ud-summary { opacity: 0; transition: opacity 0.4s ease; }
.ud-summary.ud-show { opacity: 1; }
.ud-stitle { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 12px; }
.ud-summary h3 { font-size: 15px; color: var(--text-primary); margin-bottom: 12px; font-weight: 600; }
.ud-summary h4 { font-size: 12px; color: var(--accent-orange); margin: 14px 0 8px; font-weight: 600; }
.ud-summary p { font-size: 12px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 8px; }
.ud-summary ul { list-style: none; padding: 0; margin: 0 0 8px; }
.ud-summary li { font-size: 11px; color: var(--text-secondary); line-height: 1.6; padding-left: 14px; position: relative; margin-bottom: 6px; }
.ud-summary li::before { content: "•"; color: var(--accent-orange); position: absolute; left: 0; }
.ud-bold { color: var(--text-primary); font-weight: 600; }

/* Learn */
.ud-learn { opacity: 0; transition: opacity 0.4s ease; position: absolute; top: 16px; left: 16px; right: 16px; }
.ud-learn.ud-show { opacity: 1; }
.ud-lhead { font-size: 12px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.ud-ltip { font-size: 11px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 8px; padding-left: 12px; position: relative; }
.ud-ltip::before { content: "•"; position: absolute; left: 0; color: var(--text-muted); }
.ud-lsec { margin-bottom: 16px; }
.ud-phrase { background: rgba(255,255,255,0.04); border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; }
body.day-theme .ud-phrase { background: rgba(0,0,0,0.03); }
.ud-pw { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; }
.ud-pd { font-size: 11px; color: var(--text-muted); margin-bottom: 4px; }
.ud-pp { font-size: 11px; color: var(--accent-orange); line-height: 1.5; }
.ud-pe { font-size: 11px; color: var(--text-secondary); font-style: italic; margin-top: 4px; }

/* Maps */
.ud-maps { opacity: 0; transition: opacity 0.4s ease; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: #1a1a2e; }
body.day-theme .ud-maps { background: #f0f4f8; }
.ud-maps.ud-show { opacity: 1; }

.ud-map-svg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
}
.ud-map-svg line {
    stroke: rgba(74,158,255,0.2); stroke-width: 1.5;
    opacity: 0; transition: opacity 0.5s ease;
}
body.day-theme .ud-map-svg line { stroke: rgba(74,144,226,0.25); }
.ud-map-svg line.ud-line-show { opacity: 1; }

.ud-node {
    position: absolute; padding: 8px 16px;
    background: #2a3a5c; border: 1px solid rgba(74,158,255,0.4);
    border-radius: 20px; font-size: 11px; font-weight: 500;
    color: #7ab8ff; white-space: nowrap;
    opacity: 0; transform: scale(0.8);
    transition: all 0.4s ease;
    z-index: 2;
}
body.day-theme .ud-node { background: #dce8f5; border-color: rgba(74,144,226,0.3); color: #4a90e2; }
.ud-node.ud-show { opacity: 1; transform: scale(1); }
.ud-node.ud-center { background: #1e3260; border-color: rgba(74,158,255,0.6); font-size: 13px; font-weight: 600; padding: 10px 20px; }
body.day-theme .ud-node.ud-center { background: #c4d9f2; }

/* Node click animation */
.ud-node.ud-node-hover {
    background: #3a5a8c !important;
    border-color: rgba(74,158,255,0.9) !important;
    transform: scale(1.25) !important;
    box-shadow: 0 0 24px rgba(74,158,255,0.5), 0 0 48px rgba(74,158,255,0.2);
    transition: all 0.15s ease !important;
}
body.day-theme .ud-node.ud-node-hover {
    background: #a8c8f0 !important;
}
.ud-node.ud-node-clicked {
    background: #4a6a9c !important;
    border-color: #fff !important;
    transform: scale(0.9) !important;
    box-shadow: 0 0 32px rgba(74,158,255,0.7), 0 0 64px rgba(74,158,255,0.3);
    transition: all 0.1s ease !important;
}
body.day-theme .ud-node.ud-node-clicked {
    background: #90b8e8 !important;
}

.ud-mlabel { position: absolute; font-size: 9px; color: rgba(255,255,255,0.25); white-space: nowrap; opacity: 0; transition: opacity 0.5s ease; }
body.day-theme .ud-mlabel { color: rgba(0,0,0,0.25); }
.ud-mlabel.ud-show { opacity: 1; }

.ud-card {
    position: absolute;
    background: rgba(40,40,50,0.95); border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px; padding: 14px; width: 200px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.4);
    opacity: 0; transform: translateY(8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 20;
}
body.day-theme .ud-card { background: rgba(255,255,255,0.98); border-color: rgba(0,0,0,0.1); box-shadow: 0 12px 32px rgba(0,0,0,0.15); }
.ud-card.ud-show { opacity: 1; transform: translateY(0); }
.ud-card-tag { display: inline-block; font-size: 9px; padding: 2px 8px; background: rgba(74,158,255,0.2); color: #7ab8ff; border-radius: 10px; margin-bottom: 6px; }
body.day-theme .ud-card-tag { background: rgba(74,144,226,0.15); color: #4a90e2; }
.ud-card h4 { font-size: 13px; color: var(--text-primary); margin-bottom: 6px; }
.ud-card p { font-size: 11px; color: var(--text-secondary); line-height: 1.5; }

/* Progress Bar */
.ud-progress {
    display: flex;
    justify-content: center;
    gap: 0;
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
}
.ud-progress-step {
    padding: 6px 16px;
    font-size: 11px;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    transition: all 0.3s ease;
    white-space: nowrap;
    cursor: pointer;
}
.ud-progress-step:hover {
    color: var(--text-secondary);
    border-bottom-color: var(--text-muted);
}
.ud-progress-step.ud-step-active {
    color: var(--accent-orange);
    border-bottom-color: var(--accent-orange);
}

/* Responsive */
@media (max-width: 768px) {
    .ud-demo { min-height: 600px; }
    .ud-editor { flex-direction: column; }
    .ud-text-ed { flex: none; width: 100%; }
    .ud-ai { max-width: 100%; }
    .ud-content { flex-direction: column; }
    .ud-doc { flex: none; border-right: none; border-bottom: 1px solid var(--border-color); }
}