/* Case study long-page styles, builds on styles.css vars */

.cs-hero { padding: 80px 0 56px; border-bottom: 1px solid var(--line); }
.cs-back { font-size: 14px; color: var(--ink-soft); text-decoration: none; font-weight: 500; }
.cs-back:hover { color: var(--accent); }
.cs-hero h1 { font-size: clamp(38px, 6vw, 64px); margin-top: 28px; max-width: 780px; }
.cs-hero .sub { font-size: 21px; color: var(--ink-soft); margin-top: 22px; max-width: 620px; line-height: 1.55; }
.cs-facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; margin-top: 44px; }
.cs-facts .k { font-size: 12px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.cs-facts .v { font-size: 15.5px; margin-top: 6px; font-weight: 500; }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

.cs-block { padding: 72px 0; border-bottom: 1px solid var(--line); }
.cs-block .lead-num { font-family: var(--serif); font-size: 15px; color: var(--accent); font-weight: 600; }
.cs-block h2 { font-family: var(--serif); font-size: 32px; font-weight: 560; letter-spacing: -0.015em; margin: 8px 0 20px; }
.cs-block .body { max-width: 680px; color: var(--ink-soft); font-size: 17px; }
.cs-block .body p + p { margin-top: 16px; }
.cs-block .body b { color: var(--ink); font-weight: 600; }

.cs-full { margin-top: 40px; }
.cs-full img { width: 100%; height: auto; display: block; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.cs-full .cap { font-size: 13.5px; color: var(--ink-soft); margin-top: 12px; }

.cs-phones { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px; }
.cs-phones img { width: 100%; border: 1px solid var(--line); border-radius: 10px; }

/* Live interactive demo widget */
.demo {
  margin-top: 40px; background: var(--card);
  border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
}
.demo .demo-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-bottom: 1px solid var(--line); background: #f6f2ea;
}
.demo .dot { width: 11px; height: 11px; border-radius: 99px; background: #d9d2c4; }
.demo .demo-tag { margin-left: auto; font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }
.demo .demo-body { padding: 32px; }
.demo h4 { font-family: var(--serif); font-size: 22px; font-weight: 600; }
.demo .demo-sub { font-size: 14.5px; color: var(--ink-soft); margin: 6px 0 24px; }

.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft); margin-bottom: 7px; }
.field input[type=range] { width: 100%; accent-color: var(--accent); }
.field .val { font-family: var(--serif); font-size: 20px; font-weight: 600; margin-top: 4px; }
.readout { background: var(--ink); color: var(--cream); border-radius: 12px; padding: 26px; }
.readout .r-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.12); font-size: 14.5px; }
.readout .r-row:last-child { border: 0; padding-top: 16px; }
.readout .r-row span:first-child { color: #cfc9bc; }
.readout .r-row b { font-weight: 600; }
.readout .big { font-family: var(--serif); font-size: 30px; font-weight: 600; }
.readout .big.good { color: #6ee7a8; }
.readout .big.bad { color: #ff9b8a; }

.next-case { padding: 64px 0 110px; text-align: center; }
.next-case a { font-family: var(--serif); font-size: 30px; font-weight: 560; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.next-case a:hover { color: var(--accent); }
.next-case .k { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 12px; }

@media (max-width: 860px) {
  .cs-facts { grid-template-columns: 1fr 1fr; }
  .cs-phones { grid-template-columns: 1fr 1fr; }
  .calc-grid { grid-template-columns: 1fr; }
}

/* ===== v2 case additions ===== */

/* Decisions & tradeoffs */
.decisions { margin-top: 36px; display: grid; gap: 14px; }
.decision { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px 26px; }
.decision .d-head { font-weight: 600; font-size: 16px; }
.decision .d-trade { font-size: 14.5px; color: var(--ink-soft); margin-top: 8px; }
.decision .d-trade b { color: var(--accent); font-weight: 600; }

/* Reflection */
.reflect { background: #f1ede3; border-radius: 14px; padding: 34px 38px; margin-top: 40px; }
.reflect h4 { font-family: var(--serif); font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.reflect ul { list-style: none; }
.reflect li { padding: 8px 0 8px 24px; position: relative; color: var(--ink-soft); font-size: 15.5px; }
.reflect li::before { content: "↗"; position: absolute; left: 0; color: var(--accent); }

/* Booking stepper demo */
.stepper { display: flex; gap: 8px; margin-bottom: 24px; }
.stepper .st { flex: 1; text-align: center; font-size: 13px; font-weight: 600; color: var(--ink-soft); padding: 10px 4px; border-bottom: 3px solid var(--line); transition: all 0.25s; }
.stepper .st.on { color: var(--accent); border-color: var(--accent); }
.opts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.opts button {
  font-family: var(--sans); font-size: 14.5px; font-weight: 500; cursor: pointer;
  border: 1px solid var(--line); background: var(--cream); border-radius: 10px;
  padding: 16px 12px; transition: all 0.15s; text-align: center;
}
.opts button:hover { border-color: var(--accent); }
.opts button.sel { background: var(--ink); color: var(--cream); border-color: var(--ink); }
.opts button small { display: block; font-size: 12px; color: inherit; opacity: 0.65; margin-top: 3px; }
.confirm-card { background: var(--ink); color: var(--cream); border-radius: 12px; padding: 26px; }
.confirm-card .c-row { display: flex; justify-content: space-between; font-size: 14.5px; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.12); }
.confirm-card .c-row:last-child { border: 0; }
.confirm-card .c-row span:first-child { color: #cfc9bc; }
.demo-reset { margin-top: 18px; font-size: 13.5px; font-weight: 600; color: var(--accent); background: none; border: 0; cursor: pointer; }

/* Guardrail chat demo */
.chat-demo { max-width: 560px; }
.chat-log { background: var(--cream); border: 1px solid var(--line); border-radius: 12px; padding: 18px; min-height: 130px; margin-bottom: 14px; }
.msg { max-width: 78%; padding: 10px 14px; border-radius: 14px; font-size: 14.5px; margin-bottom: 10px; }
.msg.them { background: #eee9dd; border-bottom-left-radius: 4px; }
.msg.me { background: var(--accent); color: #fff; margin-left: auto; border-bottom-right-radius: 4px; }
.msg.me .redact { background: rgba(255,255,255,0.25); border-radius: 4px; padding: 0 5px; text-decoration: line-through; }
.guard-warn {
  display: none; align-items: flex-start; gap: 10px;
  background: #fdf3e7; border: 1px solid #eed9b8; border-radius: 10px;
  padding: 12px 14px; font-size: 13.5px; color: #7a5b22; margin-bottom: 12px;
}
.guard-warn.show { display: flex; }
.chat-input { display: flex; gap: 10px; }
.chat-input input {
  flex: 1; font-family: var(--sans); font-size: 15px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: #fff;
}
.chat-input input:focus { outline: 2px solid var(--accent); border-color: transparent; }
.chat-input button {
  font-family: var(--sans); font-weight: 600; font-size: 14.5px; cursor: pointer;
  background: var(--ink); color: var(--cream); border: 0; border-radius: 10px; padding: 0 22px;
}
.chat-input button:hover { background: var(--accent); }

/* Split hero for two-sided products */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.split .side { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 30px; }
.split .side h5 { font-family: var(--serif); font-size: 20px; font-weight: 600; }
.split .side .who { font-size: 12px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.split .side p { font-size: 15px; color: var(--ink-soft); margin-top: 10px; }
.split .side ul { list-style: none; margin-top: 14px; }
.split .side li { font-size: 14.5px; color: var(--ink-soft); padding: 5px 0 5px 20px; position: relative; }
.split .side li::before { content: "·"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
  .opts { grid-template-columns: 1fr 1fr; }
}