/* Studio Cahaya — arah visual "Darkroom Tembaga".
   Ruang gelap hangat: hitam kecokelatan, panel satu tingkat lebih terang, teks krem,
   aksen tembaga. Judul Instrument Serif besar dan tipis, label teknis mono kecil,
   nomor kolom besar sebagai dekorasi, satu kartu sesi untuk hasil.
   Tanpa glow, tanpa gradien, tanpa sudut membulat besar. */

:root {
  --bg: #161311;
  --surface: #1F1A17;
  --surface-2: #251F1B;
  --field: #1B1714;
  --ink: #F3EBE3;
  --ink-soft: #C0B5A7;
  --ink-dim: #A2958A;
  --line: rgba(243, 235, 227, .16);
  --line-strong: rgba(243, 235, 227, .30);
  --accent: #C08A4E;
  --accent-bright: #D8A468;
  --accent-2: #8C8478;
  --on-accent: #191411;
  --warn: #F6C9BE;
  --warn-bg: #2A1B16;
  --radius: 2px;
  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "Inter Tight", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: dark;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  letter-spacing: .005em;
}

.mono {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-dim);
  font-weight: 400;
}

/* — Bilah atas — */
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  flex-wrap: wrap;
  padding: 16px clamp(18px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.bar-brand { display: flex; align-items: center; gap: 14px; min-width: 0; }

.bar .demo-badge { color: var(--accent); }

.bar-sep { width: 1px; height: 16px; background: var(--line-strong); }

.bar-name {
  font-family: var(--serif);
  font-size: 19px;
  letter-spacing: .01em;
  white-space: nowrap;
}

.bar-name::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 10px;
  background: var(--accent);
  vertical-align: 3px;
}

.bar-meta { display: flex; align-items: center; gap: 20px; min-width: 0; }

.bar-wa {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  white-space: nowrap;
}

.bar-wa:hover { color: var(--accent-bright); }

/* — Halaman — */
.page {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(28px, 4.5vw, 64px) clamp(18px, 4vw, 48px) clamp(32px, 4vw, 56px);
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(0, .85fr);
  gap: clamp(24px, 4vw, 64px);
  padding-bottom: clamp(26px, 3.4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.kicker { margin: 0 0 22px; color: var(--accent); }

h1 {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.55rem, 6vw, 4.6rem);
  line-height: .96;
  letter-spacing: -.02em;
}

h1 em { color: var(--accent); font-style: italic; }

.lede {
  margin: 0;
  max-width: 46ch;
  font-size: 16.5px;
  font-weight: 300;
  line-height: 1.65;
  color: var(--ink-soft);
}

.masthead-side {
  align-self: end;
  padding-left: clamp(18px, 2.4vw, 32px);
  border-left: 1px solid var(--line);
}

.side-label { margin: 0 0 12px; }

.slots {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.slots li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px dotted var(--line);
}

.slot-time { font-size: 11.5px; letter-spacing: .1em; color: var(--ink); }

.slot-free,
.slot-full {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.slot-free { color: var(--accent-bright); }
.slot-full { color: var(--ink-dim); }

.slot-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-dim);
  max-width: 32ch;
}

/* — Papan dua kolom dengan garis pemisah vertikal — */
.board {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  padding-top: clamp(28px, 4vw, 52px);
}

.pane { min-width: 0; }

.pane-form { padding-right: clamp(24px, 3.2vw, 52px); }

.pane-card {
  padding-left: clamp(24px, 3.2vw, 52px);
  border-left: 1px solid var(--line);
}

.pane-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(20px, 2.4vw, 28px);
}

.pane-num {
  font-family: var(--serif);
  font-size: clamp(38px, 4.6vw, 56px);
  line-height: .78;
  letter-spacing: -.03em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.pane-titles h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(21px, 2.2vw, 26px);
  line-height: 1.1;
  letter-spacing: -.01em;
}

.pane-sub { margin: 7px 0 0; }

/* — Formulir — */
.form { display: flex; flex-direction: column; gap: 18px; }

.row-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
}

.addons { display: grid; gap: 10px; }

.fld-label {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.fld-unit {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .06em;
  text-transform: none;
  opacity: 1;
  color: var(--ink-dim);
}

.fld-req { color: var(--accent-bright); }

.fld-input {
  font-family: var(--sans);
  font-size: 15.5px;
  font-weight: 400;
  color: var(--ink);
  background-color: var(--field);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 12px 13px;
  min-height: 46px;
  transition: border-color .15s ease, background-color .15s ease;
}

.fld-input:hover { border-color: rgba(243, 235, 227, .45); }

.fld-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}

.fld-select .fld-input {
  appearance: none;
  padding-right: 36px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%),
    linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(50% + 2px),
    calc(100% - 13px) calc(50% + 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.fld-input::placeholder { color: var(--ink-dim); opacity: 1; }

.fld-hint {
  opacity: 1;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-dim);
}

.fld-error { color: var(--warn); font-size: 12px; }

.fld.is-error .fld-input { border-color: var(--warn); background-color: var(--warn-bg); }

.opt-check {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--field);
  color: var(--ink-soft);
  font-size: 14px;
  cursor: pointer;
  transition: border-color .15s ease, color .15s ease;
}

.opt-check:hover { border-color: var(--line-strong); color: var(--ink); }

.opt-check input {
  accent-color: var(--accent);
  width: 17px;
  height: 17px;
  margin: 0;
  flex: 0 0 auto;
}

.opt-check .opt-text { font-size: 13.5px; line-height: 1.4; }

.opt-check:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn {
  appearance: none;
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 15px 18px;
  transition: background-color .15s ease, transform .1s ease;
}

.btn:hover { background: var(--accent-bright); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.form-note {
  margin: -4px 0 0;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-dim);
}

.alert {
  margin: 0 0 18px;
  padding: 12px 14px;
  border-left: 3px solid #E08C7A;
  background: var(--warn-bg);
  color: var(--warn);
  font-size: 13.5px;
}

/* — Kartu sesi — */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: clamp(18px, 2.2vw, 26px);
}

.card-empty { border-top-color: var(--line-strong); }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-code {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--accent-bright);
  font-weight: 500;
  overflow-wrap: anywhere;
}

.card-tag {
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--ink-dim);
  border: 1px solid var(--line);
  padding: 3px 7px;
  white-space: nowrap;
}

.card-head {
  margin: 12px 0 18px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(24px, 2.6vw, 29px);
  line-height: 1.12;
  letter-spacing: -.01em;
}

.card-meta { margin: 0; display: grid; }

.card-meta > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
}

.card-meta > div + div { border-top: 1px dotted var(--line); }

.card-meta dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-dim);
  white-space: nowrap;
}

.card-meta dd {
  margin: 0;
  max-width: 64%;
  font-size: 12.5px;
  line-height: 1.45;
  text-align: right;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.card-lines {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.card-lines li {
  display: grid;
  grid-template-columns: auto minmax(10px, 1fr) auto;
  align-items: end;
  gap: 10px;
  font-size: 13px;
}

.ln-label { color: var(--ink-soft); line-height: 1.4; }

.ln-rule {
  height: 1px;
  border-bottom: 1px dotted var(--line-strong);
  margin-bottom: 5px;
}

.ln-amt {
  color: var(--ink);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.card-total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.card-total span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.card-total strong {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 3vw, 34px);
  line-height: 1;
  color: var(--accent-bright);
  font-variant-numeric: tabular-nums;
}

.card-msg {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.card-again {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--accent-bright);
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
}

.card-steps {
  list-style: none;
  margin: 18px 0 0;
  padding: 14px 0 0;
  border-top: 1px dotted var(--line);
  display: grid;
  gap: 10px;
}

.card-steps li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.step-mark {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0;
}

/* — Riwayat — */
.recent {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.recent-title {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.recent-list { list-style: none; margin: 0; padding: 0; }

.recent-list li {
  display: grid;
  gap: 4px;
  padding: 11px 0;
  border-bottom: 1px dotted var(--line);
}

.recent-sum { font-size: 13px; color: var(--ink); }

.recent-meta {
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

.recent-empty { margin: 10px 0 0; font-size: 12.5px; color: var(--ink-dim); }

.recent-count { margin: 12px 0 0; font-size: 10px; letter-spacing: .1em; }

/* — Footer — */
.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 22px clamp(18px, 4vw, 48px);
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-dim);
}

.foot p { margin: 0; }

.foot-credit { color: var(--ink); }

/* — Responsif — */
@media (max-width: 980px) {
  .masthead { grid-template-columns: minmax(0, 1fr); }
  .masthead-side {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 20px;
  }
  .slot-note { max-width: none; }
  .board { grid-template-columns: minmax(0, 1fr); }
  .pane-form { padding-right: 0; }
  .pane-card {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    margin-top: 32px;
    padding-top: 28px;
  }
}

@media (max-width: 560px) {
  .bar { padding: 14px 18px; }
  .bar-meta { gap: 14px; }
  .bar-meta .mono { display: none; }
  .bar-name { font-size: 17px; }
  .page { padding: 24px 18px 36px; }

  h1 { font-size: clamp(2.3rem, 10vw, 2.9rem); margin-bottom: 18px; }
  .lede { font-size: 15.5px; }

  .row-2 { grid-template-columns: minmax(0, 1fr); gap: 14px; }

  .pane-num { font-size: 40px; }
  .pane-sub { font-size: 10px; letter-spacing: .1em; }

  .card-meta dd { max-width: 58%; font-size: 12px; }
  .card-total strong { font-size: 30px; }

  .foot { padding: 18px; }
}