/* =============================================
   DESIGN TOKENS & LAYOUT
   ============================================= */
:root {
  --bg: #0d1117; --bg-1: #161b22; --bg-2: #21262d; --bg-3: #2d333b;
  --border: #30363d; --border-hi: #444c56;
  --fg: #e6edf3; --fg-2: #adbac7; --fg-3: #768390;
  --accent: #e8716a; --accent-dim: rgba(232,113,106,0.15); --accent-hover: #f08078;
  --green: #3fb950; --yellow: #d29922; --blue: #388bfd;
  --font: "TX-02", "Instrument Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;
  --radius: 6px; --radius-lg: 10px;
  --shadow: 0 8px 24px rgba(0,0,0,0.4);
  --transition: 0.15s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; width: 100%; font-family: var(--font); background: var(--bg); color: var(--fg); overflow: hidden; font-size: 14px; line-height: 1.5; }

/* Shell */
#app { display: grid; grid-template-rows: 48px 1fr; grid-template-columns: 450px 1fr; height: 100vh; overflow: hidden; }
#topbar { grid-column: 1 / -1; display: flex; align-items: center; padding: 0 20px; border-bottom: 1px solid var(--border); background: var(--bg-1); gap: 16px; z-index: 10; }
.topbar-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 13px; letter-spacing: 0.04em; color: var(--fg); text-transform: uppercase; }
.topbar-logo { width: 22px; height: 22px; background: var(--accent); border-radius: 5px; display: flex; align-items: center; justify-content: center; }
.topbar-logo svg { width: 13px; height: 13px; }
.topbar-sep { width: 1px; height: 20px; background: var(--border); }
.topbar-tabs { display: flex; gap: 2px; flex: 1; }
.tab-btn { padding: 5px 12px; border: none; background: transparent; color: var(--fg-3); font-family: var(--font); font-size: 12px; font-weight: 500; border-radius: var(--radius); cursor: pointer; transition: color var(--transition), background var(--transition); letter-spacing: 0.02em; }
.tab-btn:hover { color: var(--fg-2); background: var(--bg-2); }
.tab-btn.active { color: var(--fg); background: var(--bg-3); }
.topbar-actions { display: flex; gap: 8px; margin-left: auto; align-items: center; }

/* Buttons & Inputs */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-2); color: var(--fg-2); font-family: var(--font); font-size: 12px; font-weight: 500; cursor: pointer; transition: all var(--transition); letter-spacing: 0.02em; white-space: nowrap; }
.btn:hover { border-color: var(--border-hi); color: var(--fg); background: var(--bg-3); }
.btn.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn svg { width: 13px; height: 13px; }
.schema-version { font-size: 11px; color: var(--fg-3); margin-right: 10px; }

#config-panel { border-right: 1px solid var(--border); overflow-y: auto; overflow-x: hidden; background: var(--bg-1); }
.config-section { display: none; flex-direction: column; padding: 20px; gap: 16px; }
.config-section.active { display: flex; }
.section-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-3); }
.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.field-label { font-size: 12px; font-weight: 500; color: var(--fg-2); }
.field-hint { font-size: 11px; color: var(--fg-3); line-height: 1.5; }
input[type="text"], input[type="time"], input[type="number"], select, textarea { width: 100%; padding: 7px 10px; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); color: var(--fg); font-family: var(--font); font-size: 13px; outline: none; transition: border-color var(--transition); -webkit-appearance: none; }
input[type="color"] { width: 100%; padding: 3px 4px; height: 34px; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
textarea { resize: vertical; min-height: 60px; }
.color-row { display: flex; align-items: center; gap: 10px; }
.color-preview { width: 34px; height: 34px; border-radius: var(--radius); border: 1px solid var(--border); flex-shrink: 0; }
.divider { height: 1px; background: var(--border); }
.seg-ctrl { display: flex; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 3px; gap: 3px; }
.seg-btn { flex: 1; padding: 5px 8px; border: none; border-radius: 4px; background: transparent; color: var(--fg-3); font-family: var(--font); font-size: 11px; font-weight: 600; cursor: pointer; transition: all var(--transition); letter-spacing: 0.02em; }
.seg-btn.active { background: var(--bg-3); color: var(--fg); }
.dow-grid { display: flex; gap: 6px; flex-wrap: wrap; }
.dow-chip { width: 36px; height: 28px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-2); color: var(--fg-3); font-size: 11px; font-weight: 600; cursor: pointer; transition: all var(--transition); display: flex; align-items: center; justify-content: center; }
.dow-chip.on { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.window-list { display: flex; flex-direction: column; gap: 8px; }
.window-row { display: grid; grid-template-columns: 90px 1fr 10px 1fr 28px; gap: 6px; align-items: center; }
.window-sep { font-size: 11px; color: var(--fg-3); text-align: center; }
.window-del { width: 24px; height: 24px; border: 1px solid var(--border); border-radius: var(--radius); background: transparent; color: var(--fg-3); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 15px; line-height: 1; transition: all var(--transition); }
.window-del:hover { border-color: #f85149; color: #f85149; background: rgba(248,81,73,0.1); }
.add-row { display: flex; gap: 8px; padding-top: 2px; flex-wrap: wrap; }
.toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.toggle-label { font-size: 12px; color: var(--fg-2); }
.toggle { position: relative; width: 34px; height: 18px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-track { position: absolute; inset: 0; background: var(--bg-3); border: 1px solid var(--border); border-radius: 9px; cursor: pointer; transition: background var(--transition), border-color var(--transition); }
.toggle input:checked + .toggle-track { background: var(--accent); border-color: var(--accent); }
.toggle-track::after { content: ''; position: absolute; top: 2px; left: 2px; width: 12px; height: 12px; border-radius: 50%; background: var(--fg-3); transition: transform var(--transition), background var(--transition); }
.toggle input:checked + .toggle-track::after { transform: translateX(16px); background: #fff; }
.task-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.task-card.enabled { border-color: var(--accent); }
.task-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.task-name { font-size: 13px; font-weight: 600; color: var(--fg); }
.task-desc { font-size: 11px; color: var(--fg-3); line-height: 1.5; margin-top: 3px; }
.task-settings { display: flex; flex-direction: column; gap: 10px; padding-top: 6px; border-top: 1px solid var(--border); }
.task-settings.hidden { display: none; }

/* Questions */
.question-list { display: flex; flex-direction: column; gap: 8px; }
.q-card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: border-color var(--transition); }
.q-card:hover { border-color: var(--border-hi); }
.q-card.expanded { border-color: var(--accent); }
.q-header { display: flex; align-items: center; gap: 10px; padding: 10px 12px; cursor: pointer; user-select: none; }
.q-drag-handle { color: var(--fg-3); font-size: 14px; cursor: grab; flex-shrink: 0; }
.q-num { font-size: 11px; font-weight: 700; color: var(--fg-3); min-width: 18px; }
.q-preview-text { flex: 1; font-size: 12px; color: var(--fg-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.q-type-badge { font-size: 10px; font-weight: 600; padding: 2px 7px; border-radius: 4px; text-transform: uppercase; letter-spacing: 0.04em; flex-shrink: 0; background: var(--bg-3); color: var(--fg-2); }
.q-type-badge.slider { background: rgba(56,139,253,0.15); color: var(--blue); }
.q-type-badge.choice { background: rgba(63,185,80,0.15); color: var(--green); }
.q-chevron { color: var(--fg-3); transition: transform var(--transition); flex-shrink: 0; }
.q-card.expanded .q-chevron { transform: rotate(180deg); }
.q-body { display: none; padding: 0 12px 12px; flex-direction: column; gap: 10px; border-top: 1px solid var(--border); }
.q-card.expanded .q-body { display: flex; }
.q-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.q-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
.q-condition-block { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; display: flex; flex-direction: column; gap: 8px; }
.condition-row { display: grid; grid-template-columns: 1fr 100px 80px; gap: 6px; }
.q-del-btn { display: flex; align-items: center; gap: 5px; padding: 5px 10px; background: transparent; border: 1px solid transparent; border-radius: var(--radius); color: var(--fg-3); font-family: var(--font); font-size: 11px; cursor: pointer; transition: all var(--transition); align-self: flex-end; margin-top: 4px; }
.q-del-btn:hover { border-color: #f85149; color: #f85149; background: rgba(248,81,73,0.1); }
.options-list { display: flex; flex-direction: column; gap: 6px; }
.option-row { display: flex; gap: 6px; align-items: center; }
.option-row input { flex: 1; }
.option-del { width: 24px; height: 24px; flex-shrink: 0; border: 1px solid var(--border); border-radius: var(--radius); background: transparent; color: var(--fg-3); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 15px; line-height: 1; transition: all var(--transition); }
.option-del:hover { border-color: #f85149; color: #f85149; background: rgba(248,81,73,0.1); }

/* Page Break Specifics */
.q-card.page-break { border-color: var(--border-hi); border-style: dashed; background: transparent; }
.q-card.page-break .q-header { justify-content: center; padding: 8px 12px; background: rgba(255,255,255,0.02); }
.q-card.page-break .q-del-btn { margin: 0; padding: 2px 6px; border: 1px solid var(--border); }

/* Preview Panel (Sleek Rectangle) */
#preview-panel { display: flex; flex-direction: column; background: var(--bg); overflow: hidden; border-left: 1px solid var(--border); }
#preview-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--border); background: var(--bg-1); flex-shrink: 0; }
.preview-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; color: var(--fg-3); }
.preview-session-tabs { display: flex; gap: 4px; }
.preview-session-tab { padding: 3px 10px; border: 1px solid var(--border); border-radius: 4px; background: transparent; color: var(--fg-3); font-family: var(--font); font-size: 11px; font-weight: 500; cursor: pointer; transition: all var(--transition); }
.preview-session-tab:hover { color: var(--fg-2); border-color: var(--border-hi); }
.preview-session-tab.active { background: var(--bg-3); border-color: var(--border-hi); color: var(--fg); }
.preview-reset-btn { padding: 3px 10px; border: 1px solid var(--border); border-radius: 4px; background: transparent; color: var(--fg-3); font-family: var(--font); font-size: 11px; cursor: pointer; transition: all var(--transition); }
.preview-reset-btn:hover { color: var(--fg-2); border-color: var(--border-hi); }

#preview-viewport { flex: 1; display: flex; align-items: center; justify-content: center; overflow: hidden; padding: 20px; background: var(--bg); }
.phone-shell { width: 375px; height: 800px; border: 1px solid var(--border-hi); border-radius: 12px; overflow: hidden; background: #000; position: relative; flex-shrink: 0; max-height: 100%; }
.phone-notch { display: none; }
#preview-iframe { width: 100%; height: 100%; border: none; }

/* Modals */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: none; align-items: center; justify-content: center; z-index: 100; backdrop-filter: blur(4px); }
.modal-overlay.open { display: flex; }
.modal-box { background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; width: 480px; max-width: calc(100vw - 40px); display: flex; flex-direction: column; gap: 16px; box-shadow: var(--shadow); }
.modal-title { font-size: 15px; font-weight: 700; color: var(--fg); }
.modal-subtitle { font-size: 12px; color: var(--fg-3); }
.modal-close { background: transparent; border: none; color: var(--fg-3); cursor: pointer; font-size: 18px; line-height: 1; transition: color var(--transition); padding: 0; }
.modal-close:hover { color: var(--fg); }
.export-option { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; cursor: pointer; transition: all var(--transition); }
.export-option:hover { border-color: var(--accent); background: var(--bg-3); }
.export-option-title { font-size: 13px; font-weight: 600; color: var(--fg); margin-bottom: 4px; }
.export-option-desc { font-size: 11px; color: var(--fg-3); line-height: 1.5; }

/* Misc */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hi); }
.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 4px; font-size: 10px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; }
.badge-muted { background: var(--bg-3); color: var(--fg-3); }
.badge-blue { background: rgba(56,139,253,0.15); color: var(--blue); }
@media (max-width: 900px) { #app { grid-template-columns: 1fr; grid-template-rows: 48px 1fr 0; } #preview-panel { display: none; } }