/* =========================================================
 * E-commerce Detox Investigator — styles
 * European look & feel · Playfair Display + Inter
 * =======================================================*/
:root {
  --green-deep: #1b5e43;
  --green: #2e8b62;
  --green-soft: #e6f4ec;
  --ink: #22302b;
  --ink-soft: #5c6b64;
  --bg: #f4f6f2;
  --card: #ffffff;
  --line: #dde5df;
  --danger: #d64545;
  --danger-soft: #fdecec;
  --warn: #d99a1b;
  --warn-soft: #fdf5e2;
  --ok: #2e9e5b;
  --ok-soft: #e9f8ee;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(27, 94, 67, .10);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 85% -10%, #e2efe7 0%, transparent 60%),
    radial-gradient(900px 420px at -10% 110%, #eaf1ec 0%, transparent 55%),
    var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- screens ---------------- */
.screen {
  display: none;
  min-height: 100vh;
  padding: 32px 20px 56px;
}
.screen.active { display: block; animation: fadeIn .45s ease both; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

/* ---------------- buttons ---------------- */
.btn {
  font: inherit; font-weight: 600;
  border: 0; cursor: pointer;
  border-radius: 999px;
  padding: 14px 40px;
  transition: transform .15s ease, box-shadow .15s ease, background .2s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--green-deep), var(--green));
  color: #fff;
  box-shadow: 0 8px 20px rgba(46, 139, 98, .35);
  letter-spacing: .3px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(46, 139, 98, .45); }
.btn-primary:active { transform: none; }
.btn-ghost {
  background: transparent; color: var(--green-deep);
  border: 1.5px solid var(--green-deep);
}
.btn-ghost:hover { background: var(--green-soft); }
.btn[hidden] { display: none; }

/* ---------------- intro ---------------- */
.intro-wrap { max-width: 720px; margin: 0 auto; text-align: center; padding-top: 5vh; }
.intro-badge {
  display: inline-block;
  font-size: 13px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--green-deep);
  background: var(--green-soft);
  border: 1px solid #cfe6d8;
  padding: 8px 18px; border-radius: 999px;
}
.intro-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.12;
  margin: 22px 0 26px;
  color: var(--ink);
}
.intro-title em { font-style: italic; color: var(--green); }

.intro-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px 38px 38px;
  text-align: left;
}
.intro-card h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 24px; margin-bottom: 14px;
}
.intro-card p { color: var(--ink-soft); line-height: 1.75; margin-bottom: 12px; font-size: 15.5px; }
.intro-card strong { color: var(--green-deep); }

.intro-steps {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin: 18px 0 26px;
}
.intro-steps span {
  background: var(--green-soft); color: var(--green-deep);
  font-size: 13.5px; font-weight: 600;
  padding: 9px 16px; border-radius: 999px;
}

/* ---------------- quiz ---------------- */
.quiz-wrap { max-width: 860px; margin: 0 auto; }
.quiz-topbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 10px;
}
.quiz-progress { font-size: 13.5px; font-weight: 600; color: var(--ink-soft); letter-spacing: .4px; }
.quiz-count {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 17px; font-weight: 700; color: var(--green-deep);
}
.progress-track {
  height: 6px; border-radius: 999px;
  background: #e3e9e4; overflow: hidden; margin-bottom: 26px;
}
.progress-fill {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--green), var(--green-deep));
  border-radius: 999px;
  transition: width .5s cubic-bezier(.4, 0, .2, 1);
}

.quiz-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px 36px 30px;
}
.quiz-question {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(21px, 3vw, 27px);
  line-height: 1.35;
  margin-bottom: 24px;
}
.quiz-subtitle { color: var(--ink-soft); margin: -16px 0 20px; font-size: 15px; }

/* options */
.options { display: grid; gap: 12px; }
.options.product-grid { grid-template-columns: repeat(2, 1fr); }

.option {
  display: flex; align-items: center; gap: 14px;
  width: 100%; text-align: left;
  font: inherit; color: inherit;
  background: #fbfcfa;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  cursor: pointer;
  transition: border-color .18s, background .18s, transform .12s, box-shadow .18s;
}
.option:hover:not(:disabled) {
  border-color: var(--green);
  background: var(--green-soft);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(46, 139, 98, .14);
}
.option:disabled { cursor: default; opacity: .92; }

.option-key {
  flex: none;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  font-weight: 700; font-size: 15px;
  color: var(--green-deep);
  background: var(--green-soft);
  border-radius: 50%;
}
.option-label { font-size: 15.5px; line-height: 1.5; font-weight: 500; }

/* product cards */
.option.product-card {
  flex-direction: column; align-items: stretch; gap: 0;
  padding: 0; overflow: hidden;
}
.option.product-card .product-img {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover; display: block;
  background: #eef2ee;
}
.option.product-card .product-label {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; font-weight: 600; font-size: 15px;
}

/* fictional platform logos (Q3) */
.logo-row {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-left: auto;
}
.logo-chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13.5px; font-weight: 700; color: var(--ink-soft);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px 5px 5px;
}
.logo-badge {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  color: #fff; font-size: 12.5px; font-weight: 800;
  border-radius: 7px;
}

/* feedback states — flash animations */
@keyframes flashGreen {
  0%, 100% { background: var(--ok-soft); border-color: var(--ok); }
  25%, 75% { background: #d6f4e0; border-color: var(--ok); }
  50%      { background: var(--ok-soft); }
}
@keyframes flashRed {
  0%   { background: var(--danger-soft); border-color: var(--danger); }
  50%  { background: #fbdcDC; }
  100% { background: var(--danger-soft); border-color: var(--danger); }
}
@keyframes flashYellow {
  0%   { background: var(--warn-soft); border-color: var(--warn); }
  50%  { background: #fbeec9; }
  100% { background: var(--warn-soft); border-color: var(--warn); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); } 40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); } 80% { transform: translateX(3px); }
}

.option.state-correct { animation: flashGreen .8s ease 2; background: var(--ok-soft); border-color: var(--ok); }
.option.state-wrong   { animation: flashRed .6s ease 2, shake .45s ease; background: var(--danger-soft); border-color: var(--danger); }
.option.state-warn    { animation: flashYellow .7s ease 2; background: var(--warn-soft); border-color: var(--warn); }
.option.dimmed { opacity: .45; }

.option .mark {
  margin-left: auto; flex: none;
  font-size: 19px; font-weight: 700;
}
.option.state-correct .mark { color: var(--ok); }
.option.state-wrong .mark   { color: var(--danger); }
.option.state-warn .mark    { color: var(--warn); }

/* feedback text */
.quiz-feedback {
  margin-top: 20px;
  border-radius: 12px;
  padding: 18px 20px;
  font-size: 15px; line-height: 1.75;
  animation: fadeIn .4s ease both;
}
.quiz-feedback.correct { background: var(--ok-soft); border-left: 4px solid var(--ok); color: #1d5e37; }
.quiz-feedback.wrong   { background: var(--danger-soft); border-left: 4px solid var(--danger); color: #8f2f2f; }
.quiz-feedback.warn    { background: var(--warn-soft); border-left: 4px solid var(--warn); color: #7d5c10; }
.quiz-feedback .fb-mark { font-weight: 800; margin-right: 8px; font-size: 17px; }

.quiz-actions { margin-top: 26px; display: flex; justify-content: flex-end; }

/* ---------------- finish ---------------- */
.finish-wrap { max-width: 560px; margin: 0 auto; text-align: center; padding-top: 8vh; }
.finish-icon { font-size: 58px; margin-bottom: 10px; }
.finish-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(30px, 5vw, 44px); margin-bottom: 8px;
}
.finish-sub { color: var(--ink-soft); font-size: 16.5px; margin-bottom: 30px; }
.finish-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 34px;
  text-align: left;
}
.finish-card label {
  display: block; font-weight: 600; font-size: 14px;
  letter-spacing: .5px; text-transform: uppercase;
  color: var(--ink-soft); margin-bottom: 10px;
}
.finish-card input {
  width: 100%; font: inherit; font-size: 17px;
  padding: 14px 16px;
  border: 1.5px solid var(--line); border-radius: 10px;
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.finish-card input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(46, 139, 98, .14);
}
.optional-tag {
  position: absolute; top: 60px; right: 20px;
  font-size: 12px; color: #98a59e;
  background: #f0f3f0; padding: 3px 10px; border-radius: 999px;
}
.finish-card .btn { width: 100%; margin-top: 22px; }

/* ---------------- certificate ---------------- */
.cert-wrap { max-width: 980px; margin: 0 auto; text-align: center; }
.cert-heading {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(24px, 4vw, 34px); margin-bottom: 18px;
}
.cert-style-picker {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; flex-wrap: wrap; margin-bottom: 22px;
}
.picker-label { font-size: 14px; font-weight: 600; color: var(--ink-soft); }
.picker-btn {
  font: inherit; font-size: 13.5px; font-weight: 600;
  padding: 8px 18px; border-radius: 999px; cursor: pointer;
  border: 1.5px solid var(--line); background: #fff; color: var(--ink-soft);
  transition: all .18s;
}
.picker-btn:hover { border-color: var(--green); color: var(--green-deep); }
.picker-btn.active {
  background: var(--green-deep); border-color: var(--green-deep); color: #fff;
}

.cert-canvas-holder {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(27, 94, 67, .18);
  border: 1px solid var(--line);
  background: #fff;
}
#cert-canvas { display: block; width: 100%; height: auto; }

.cert-actions {
  margin-top: 26px;
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
}
.cert-status { margin-top: 14px; font-size: 13.5px; color: var(--ink-soft); min-height: 18px; }

/* ---------------- responsive ---------------- */
@media (max-width: 640px) {
  .options.product-grid { grid-template-columns: 1fr; }
  .quiz-card { padding: 24px 20px; }
  .intro-card { padding: 26px 22px; }
  .optional-tag { top: 58px; }
}