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

:root {
  --bg:          #0e0e0e;
  --surface:     #161616;
  --surface-2:   #1f1f1f;
  --border:      #2a2a2a;
  --border-hi:   #3d3d3d;

  --amber:       #f5a623;
  --amber-dim:   #a86e14;
  --amber-glow:  rgba(245, 166, 35, 0.12);

  --green:       #4ade80;
  --green-dim:   rgba(74, 222, 128, 0.15);

  --red:         #f87171;
  --red-dim:     rgba(248, 113, 113, 0.12);

  --text-primary:   #f0ece3;
  --text-secondary: #8a8478;
  --text-muted:     #4a4642;

  --font-display: 'Syne', sans-serif;
  --font-mono:    'DM Mono', monospace;

  --radius:     6px;
  --gap:        24px;
}

/* ── Base ────────────────────────────────────────────────── */
html { 
  font-size: 16px; 
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Grain texture overlay */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ── Layout ──────────────────────────────────────────────── */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* ── Header ──────────────────────────────────────────────── */
.header {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}

.header-inner {
  display: flex;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  font-size: 1.5rem;
  color: var(--amber);
  animation: pulse-mark 3s ease-in-out infinite;
}

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

.logo-text {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
}

.tagline {
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Main Grid ───────────────────────────────────────────── */
.main {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 28px;
  align-items: start;
  padding-bottom: 60px;
}

@media (max-width: 820px) {
  .main { grid-template-columns: 1fr; }
}

/* ── Panels ──────────────────────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Cards ───────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--border-hi);
}

.card-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-num {
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

/* ── Form Fields ─────────────────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-full { margin-top: 14px; }

label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

input[type="text"],
input[type="time"],
input[type="number"],
select {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 10px 12px;
  width: 100%;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  appearance: none;
}

input:focus, select:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-glow);
}

input::placeholder { color: var(--text-muted); }

select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238a8478' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.hint {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ── Time Row ────────────────────────────────────────────── */
.time-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: end;
}

.divider-arrow {
  color: var(--amber);
  font-size: 1.1rem;
  padding-bottom: 10px;
  text-align: center;
}

/* ── Duration Row ────────────────────────────────────────── */
.duration-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn-add {
  margin-top: 18px;
  width: 100%;
  background: var(--surface-2);
  border: 1px dashed var(--amber-dim);
  border-radius: var(--radius);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
  letter-spacing: 0.05em;
}

.btn-add:hover {
  background: var(--amber-glow);
  border-color: var(--amber);
  transform: translateY(-1px);
}

.btn-add:active { 
  transform: translateY(0); 
}

.btn-icon { 
  font-size: 1.1rem; 
  line-height: 1; 
}

.btn-generate {
  width: 100%;
  background: var(--amber);
  border: none;
  border-radius: var(--radius);
  color: #0e0e0e;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  padding: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.02em;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.btn-generate::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
}

.btn-generate:hover::before { 
  transform: translateX(0); 
}

.btn-generate:hover { 
  transform: translateY(-2px); 
  box-shadow: 0 8px 24px rgba(245,166,35,0.3);
}

.btn-generate:active { 
  transform: translateY(0); 
}

.btn-arrow { 
  font-size: 1.3rem; 
}

.btn-reset {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 10px 16px;
  cursor: pointer;
  margin-top: 24px;
  transition: border-color 0.2s, color 0.2s;
  letter-spacing: 0.05em;
}

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

/* ── Task List (Queue) ───────────────────────────────────── */
.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 260px;
  overflow-y: auto;
  padding-right: 4px;
}

.task-list::-webkit-scrollbar { 
  width: 4px; 
}

.task-list::-webkit-scrollbar-track { 
  background: transparent; 
}
.task-list::-webkit-scrollbar-thumb { 
  background: var(--border-hi); 
  border-radius: 2px; 
}

.task-empty {
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 12px 0;
  text-align: center;
  letter-spacing: 0.05em;
}

.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  animation: slide-in 0.2s ease;
}

@keyframes slide-in {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

.task-item-name {
  font-size: 0.85rem;
  color: var(--text-primary);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.task-item-duration {
  font-size: 0.72rem;
  color: var(--amber);
  margin-left: 10px;
  white-space: nowrap;
}

.task-item-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 1rem;
  line-height: 1;
  transition: color 0.2s;
  margin-left: 8px;
}

.task-item-remove:hover { 
  color: var(--red); 
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--amber);
  color: #0e0e0e;
  font-size: 0.65rem;
  font-weight: 700;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  font-family: var(--font-mono);
}

/* ── Output Panel ────────────────────────────────────────── */
.panel-output {
  position: sticky;
  top: 24px;
}

.output-placeholder {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 32px;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  min-height: 300px;
  justify-content: center;
}

.placeholder-icon {
  font-size: 2.5rem;
  color: var(--border-hi);
  animation: pulse-mark 3s ease-in-out infinite;
}

.output-placeholder p {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  max-width: 240px;
  line-height: 1.7;
}

/* ── Schedule View ───────────────────────────────────────── */
.schedule-view {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  animation: fade-up 0.4s ease;
}

@keyframes fade-up {
  from { 
    opacity: 0; 
    transform: translateY(12px); 
  }
  to   { 
    opacity: 1; 
    transform: translateY(0); 
  }
}

.schedule-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 8px;
}

.schedule-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.schedule-meta {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Timeline ────────────────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 56px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-block {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0 16px;
  position: relative;
}

.block-time {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  padding-top: 14px;
  text-align: right;
  padding-right: 4px;
  line-height: 1;
}

.block-content {
  margin-left: 16px;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 6px;
  position: relative;
  border: 1px solid transparent;
}

.block-content::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* Task block */
.block-task .block-content {
  background: var(--amber-glow);
  border-color: var(--amber-dim);
}

.block-task .block-content::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--amber-dim);
}

.block-task .block-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.block-task .block-duration {
  font-size: 0.7rem;
  color: var(--amber);
  margin-top: 3px;
  letter-spacing: 0.05em;
}

/* Gap block */
.block-gap .block-content {
  background: transparent;
  border: none;
  padding: 4px 16px;
}

.block-gap .block-content::before {
  background: var(--border-hi);
  width: 5px;
  height: 5px;
}

.block-gap .block-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* Free block */
.block-free .block-content {
  background: var(--green-dim);
  border-color: rgba(74, 222, 128, 0.25);
}

.block-free .block-content::before {
  background: var(--green);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px rgba(74, 222, 128, 0.3);
}

.block-free .block-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.block-free .block-duration {
  font-size: 0.7rem;
  color: rgba(74, 222, 128, 0.6);
  margin-top: 3px;
  letter-spacing: 0.05em;
}

/* ── Free Time Summary ───────────────────────────────────── */
.free-time-summary {
  margin-top: 24px;
  padding: 16px 18px;
  background: var(--green-dim);
  border: 1px solid rgba(74, 222, 128, 0.2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.fts-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(74, 222, 128, 0.7);
}

.fts-value {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--green);
}

/* ── Toast ───────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--surface-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 12px 20px;
  z-index: 100;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.error { border-color: var(--red); color: var(--red); }
.toast.success { border-color: var(--green); color: var(--green); }