/* nD Strategist — Web App Styles */

:root {
  --font: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
}

[data-theme="light"] {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface2: #eef0f6;
  --border: #d8dbe6;
  --accent: #4a5ae0;
  --accent-dim: #3948c0;
  --accent-glow: rgba(74, 90, 224, 0.1);
  --text: #1a1a2e;
  --text-dim: #5a5f7a;
  --text-muted: #9498b0;
  --success: #4caf50;
  --warning: #ff9800;
  --error: #f44336;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: #2e3352;
  --accent: #5b6af0;
  --accent-dim: #3d4bbb;
  --accent-glow: rgba(91, 106, 240, 0.15);
  --text: #e8eaf6;
  --text-dim: #8b90b0;
  --text-muted: #555a7a;
  --success: #4caf50;
  --warning: #ff9800;
  --error: #f44336;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
}

/* ── Landing Screen ─────────────────────────────────────────── */

#landing {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
}

.landing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 3rem;
  max-width: 560px;
  width: 100%;
  box-shadow: var(--shadow);
}

.landing-card h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.landing-card .tagline {
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
}

.mode-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.mode-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: transparent;
}

.mode-option:hover {
  border-color: var(--accent-dim);
  background: var(--accent-glow);
}

.mode-option.selected {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.mode-option input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--accent);
  flex-shrink: 0;
}

.mode-label strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.mode-label span {
  font-size: 0.85rem;
  color: var(--text-dim);
}

#deep-dive-phase-row {
  display: none;
  margin-top: -0.25rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: center;
  gap: 0.75rem;
}

#deep-dive-phase-row label {
  color: var(--text-dim);
  font-size: 0.9rem;
  white-space: nowrap;
}

#deep-dive-phase-row select {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  font-family: var(--font);
}

#begin-btn {
  width: 100%;
  padding: 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  letter-spacing: 0.01em;
}

#begin-btn:hover { background: var(--accent-dim); }
#begin-btn:active { transform: scale(0.98); }
#begin-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Session Screen ─────────────────────────────────────────── */

#session {
  display: none;
  height: 100vh;
  flex-direction: column;
}

.session-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}

.session-header .brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.mode-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.phase-indicator {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.phase-indicator span {
  color: var(--text);
  font-weight: 600;
}

/* ── Split Panel ────────────────────────────────────────────── */

.split-panel {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Chat Panel ─────────────────────────────────────────────── */

.chat-panel {
  display: flex;
  flex-direction: column;
  width: 55%;
  border-right: 1px solid var(--border);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-behavior: smooth;
}

.message {
  max-width: 85%;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius);
  font-size: 0.92rem;
  line-height: 1.65;
}

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

.message.user {
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
  align-self: flex-end;
  text-align: right;
}

.message.system-note {
  align-self: center;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
  max-width: 100%;
  padding: 0.4rem 1rem;
}

.message .typing-cursor::after {
  content: '▋';
  animation: blink 0.8s step-end infinite;
  color: var(--accent);
}

@keyframes blink {
  50% { opacity: 0; }
}

/* Markdown rendered content */
.message h1, .message h2, .message h3 {
  color: var(--text);
  margin: 0.75rem 0 0.4rem;
  line-height: 1.3;
}
.message h1 { font-size: 1.2rem; }
.message h2 { font-size: 1.05rem; }
.message h3 { font-size: 0.95rem; }
.message p { margin-bottom: 0.5rem; }
.message ul, .message ol { padding-left: 1.4rem; margin-bottom: 0.5rem; }
.message li { margin-bottom: 0.2rem; }
.message code {
  font-family: var(--mono);
  background: var(--surface2);
  padding: 0.15em 0.35em;
  border-radius: 3px;
  font-size: 0.87em;
}
.message pre {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  overflow-x: auto;
  margin: 0.5rem 0;
}
.message pre code { background: none; padding: 0; }
.message strong { color: var(--text); }
.message em { color: var(--text-dim); }
.message hr { border: none; border-top: 1px solid var(--border); margin: 0.75rem 0; }

/* Report download button inside chat */
.report-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0.45rem 0.9rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  text-decoration: none;
}

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

/* ── Input Area ─────────────────────────────────────────────── */

.input-area {
  padding: 1rem 1.5rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.upload-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.upload-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.upload-label:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.upload-label input { display: none; }

#upload-status {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.upload-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.upload-list:empty {
  display: none;
}

.upload-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 0.2rem 0.6rem;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.upload-chip-remove {
  cursor: pointer;
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1;
  margin-left: 0.15rem;
}

.upload-chip-remove:hover {
  color: var(--error);
}

.input-row {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
}

#user-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.92rem;
  resize: none;
  min-height: 44px;
  max-height: 140px;
  outline: none;
  transition: border-color 0.15s;
}

#user-input:focus { border-color: var(--accent); }
#user-input::placeholder { color: var(--text-muted); }

#send-btn {
  padding: 0.7rem 1.3rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
  height: 44px;
}

#send-btn:hover { background: var(--accent-dim); }
#send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Worksheet Panel ────────────────────────────────────────── */

.worksheet-panel {
  width: 45%;
  display: flex;
  flex-direction: column;
  background: var(--surface);
}

.worksheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.worksheet-header h2 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.worksheet-actions {
  display: flex;
  gap: 0.5rem;
}

.ws-btn {
  padding: 0.3rem 0.7rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.78rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

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

.worksheet-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
  scroll-behavior: smooth;
}

.worksheet-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
  gap: 0.5rem;
}

.worksheet-empty .icon { font-size: 2.5rem; opacity: 0.4; }
.worksheet-empty p { font-size: 0.88rem; }

.phase-section {
  margin-bottom: 1.75rem;
}

.phase-section-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.phase-section-header h3 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.phase-section-header .phase-num {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  border-radius: 20px;
  color: var(--accent);
}

.phase-section-divider {
  flex: 1;
  height: 1px;
  background: var(--border);
}

.phase-section-content {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* Reuse markdown styles in worksheet */
.phase-section-content h1,
.phase-section-content h2,
.phase-section-content h3 {
  color: var(--text);
  margin: 0.6rem 0 0.3rem;
}
.phase-section-content p { margin-bottom: 0.4rem; }
.phase-section-content ul,
.phase-section-content ol { padding-left: 1.3rem; margin-bottom: 0.4rem; }
.phase-section-content li { margin-bottom: 0.15rem; }
.phase-section-content strong { color: var(--text); }

/* ── Scrollbars ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Utility ────────────────────────────────────────────────── */
.hidden { display: none !important; }

@media (max-width: 768px) {
  .split-panel { flex-direction: column; }
  .chat-panel { width: 100%; border-right: none; border-bottom: 1px solid var(--border); height: 60vh; }
  .worksheet-panel { width: 100%; height: 40vh; }
}

/* ── Settings Button ────────────────────────────────────────── */

.landing-card { position: relative; }

.settings-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  padding: 0.3rem 0.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: border-color 0.15s, color 0.15s;
}

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

/* Session header variant — not absolutely positioned */
.session-header .settings-btn {
  position: static;
  margin-left: 0.5rem;
}

/* ── Settings Modal ─────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 0.25rem;
  transition: color 0.15s;
}
.modal-close:hover { color: var(--text); }

.modal-body {
  padding: 1.25rem;
}

.setting-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.api-key-row {
  display: flex;
  gap: 0.5rem;
}

.api-key-row input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s;
}
.api-key-row input:focus { border-color: var(--accent); }

.toggle-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 0 0.75rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.toggle-btn:hover { border-color: var(--accent); color: var(--accent); }

.setting-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.6rem;
}

.modal-footer {
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
}

.modal-footer button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.modal-footer button:hover { background: var(--accent-dim); }

/* ── Theme Toggle ──────────────────────────────────────────── */

.theme-toggle-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.theme-btn {
  flex: 1;
  padding: 0.5rem 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

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

.theme-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 600;
}

/* ── Login Screen ──────────────────────────────────────────── */

#login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  z-index: 200;
  padding: 2rem;
}

#login-screen .landing-card {
  text-align: center;
}

#login-password {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  outline: none;
  margin-bottom: 1rem;
  transition: border-color 0.15s;
}

#login-password:focus {
  border-color: var(--accent);
}

#login-password::placeholder {
  color: var(--text-muted);
}

#login-btn {
  width: 100%;
  padding: 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

#login-btn:hover { background: var(--accent-dim); }
#login-btn:active { transform: scale(0.98); }
#login-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.login-error {
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  min-height: 1.2em;
}