/* ===== Variables & Reset ===== */
:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-tertiary: #252833;
    --text-primary: #e8e8ed;
    --text-secondary: #9ca3af;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --border: #2d3040;
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.screen { display: none; width: 100%; max-width: 720px; padding: 24px; }
.screen.active { display: flex; flex-direction: column; }

/* ===== Setup Screen ===== */
#setup-screen {
    align-items: center;
    gap: 32px;
    min-height: 100vh;
    justify-content: center;
}

#setup-screen h1 {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
}

#setup-screen p.subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-top: -16px;
    font-size: 0.95rem;
}

.form-group {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input {
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--accent);
}

.mode-selector {
    display: flex;
    gap: 16px;
    width: 100%;
}

.mode-btn {
    flex: 1;
    padding: 20px 16px;
    border-radius: var(--radius);
    border: 2px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}

.mode-btn:hover { border-color: var(--accent-light); }
.mode-btn.selected { border-color: var(--accent); background: var(--bg-tertiary); }

.mode-btn .mode-title {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.mode-btn .mode-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.btn-primary {
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    width: 100%;
}

.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Upload Zone ===== */
.upload-zone {
    width: 100%;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg-secondary);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: var(--bg-tertiary);
}

.upload-zone.uploading {
    opacity: 0.6;
    pointer-events: none;
}

.upload-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: 300;
}

.upload-text {
    font-size: 0.92rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.upload-hint {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.upload-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.upload-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.upload-item-icon {
    background: var(--accent);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}

.upload-item-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.upload-item-chunks {
    color: var(--text-secondary);
    font-size: 0.78rem;
    flex-shrink: 0;
}

.upload-item-delete {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    padding: 2px 8px;
    font-size: 0.75rem;
    transition: all 0.2s;
}

.upload-item-delete:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.upload-status {
    font-size: 0.82rem;
    min-height: 1.2em;
}

.upload-status.success { color: var(--success); }
.upload-status.warning { color: var(--warning); }
.upload-status.error { color: var(--danger); }
.upload-status.uploading { color: var(--accent-light); }

.badge-docs {
    background: var(--success);
    color: #fff;
}

/* ===== Chat Screen ===== */
#chat-screen {
    height: 100vh;
    max-height: 100vh;
    padding: 0;
    gap: 0;
}

.chat-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}

.badge-mode { background: var(--accent); color: #fff; }
.badge-topic { background: var(--bg-tertiary); color: var(--text-secondary); border: 1px solid var(--border); }

.chat-header-right {
    display: flex;
    align-items: center;
}

.btn-end {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--danger);
    background: transparent;
    color: var(--danger);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-end:hover { background: var(--danger); color: #fff; }

.btn-reset {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    margin-left: 8px;
}

.btn-reset:hover { border-color: var(--text-secondary); }

/* Phase indicator */
.phase-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 14px 24px 6px;
    flex-shrink: 0;
}

.phase-step {
    display: flex;
    align-items: center;
}

.phase-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 2px solid var(--border);
    transition: all 0.3s;
    flex-shrink: 0;
}

.phase-dot.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.phase-dot.done {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}

.phase-connector {
    width: 32px;
    height: 2px;
    background: var(--border);
    flex-shrink: 0;
}

.phase-connector.done { background: var(--success); }

.phase-labels {
    display: flex;
    justify-content: space-between;
    padding: 4px 12px 10px;
    flex-shrink: 0;
    border-bottom: 1px solid var(--border);
}

.phase-label-text {
    font-size: 0.68rem;
    color: var(--text-secondary);
    text-align: center;
    flex: 1;
}

.phase-label-text.active { color: var(--accent-light); font-weight: 600; }

/* Messages */
.messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 85%;
    padding: 14px 18px;
    border-radius: var(--radius);
    line-height: 1.55;
    font-size: 0.95rem;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.assistant {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    align-self: flex-start;
}

.message.user {
    background: var(--accent);
    color: #fff;
    align-self: flex-end;
}

.typing-indicator {
    align-self: flex-start;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: none;
}

.typing-indicator span {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    margin: 0 2px;
    animation: bounce 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

/* Input bar */
.input-bar {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.input-bar input {
    flex: 1;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.input-bar input:focus { border-color: var(--accent); }

.btn-send {
    padding: 14px 24px;
    border-radius: var(--radius-sm);
    border: none;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

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

/* ===== Analysis Screen ===== */
#analysis-screen {
    min-height: 100vh;
    justify-content: flex-start;
    padding-top: 40px;
    gap: 24px;
}

#analysis-screen h2 {
    font-size: 1.5rem;
    text-align: center;
}

.scores-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 100%;
}

.score-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}

.score-card .score-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-light);
}

.score-card .score-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.score-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    margin-top: 8px;
    overflow: hidden;
}

.score-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.6s ease;
}

.analysis-section {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}

.analysis-section h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.analysis-section p, .analysis-section li {
    line-height: 1.6;
    font-size: 0.92rem;
}

.analysis-section ul {
    list-style: none;
    padding: 0;
}

.analysis-section ul li::before {
    content: "- ";
    color: var(--accent-light);
}

.rhythm-badge {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.analysis-actions {
    display: flex;
    gap: 12px;
    width: 100%;
}

.analysis-actions button { flex: 1; }

.btn-secondary {
    padding: 14px 24px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-secondary:hover { border-color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .scores-grid { grid-template-columns: repeat(2, 1fr); }
    .mode-selector { flex-direction: column; }
    .analysis-actions { flex-direction: column; }
    .chat-header { flex-wrap: wrap; gap: 8px; }
}