/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --off-white: #f5f3ef;
  --orange: #D85A30;
  --orange-dark: #b34820;
  --orange-light: #FAECE7;
  --gray-100: #f0ede8;
  --gray-200: #ddd9d2;
  --gray-400: #9a958c;
  --gray-600: #5a5650;
  --gray-800: #2a2825;
  --green: #3B6D11;
  --green-bg: #EAF3DE;
  --blue: #185FA5;
  --blue-bg: #E6F1FB;
  --amber: #854F0B;
  --amber-bg: #FAEEDA;
  --red: #A32D2D;
  --red-bg: #FCEBEB;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --radius: 12px;
  --radius-lg: 18px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--off-white);
  color: var(--black);
  overflow-x: hidden;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(245, 243, 239, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--black);
  text-decoration: none;
}
.logo span { color: var(--orange); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--black); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 100px 2rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-bg-text {
  position: absolute;
  font-family: var(--font-display);
  font-size: clamp(200px, 40vw, 500px);
  font-weight: 900;
  color: var(--gray-200);
  opacity: 0.5;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -52%);
  pointer-events: none;
  user-select: none;
  letter-spacing: -20px;
  z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 720px; }
.hero-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--orange);
  border: 1px solid var(--orange);
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 1.5rem;
  background: var(--orange-light);
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(52px, 9vw, 96px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -3px;
  color: var(--black);
  margin-bottom: 1.5rem;
}
.hero-title span { color: var(--orange); }
.hero-sub {
  font-size: 18px;
  font-weight: 300;
  color: var(--gray-600);
  line-height: 1.6;
  max-width: 500px;
  margin: 0 auto 2.5rem;
}
.hero-cta {
  display: inline-block;
  background: var(--black);
  color: var(--white);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  padding: 16px 36px;
  border-radius: 99px;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  letter-spacing: 0.3px;
}
.hero-cta:hover { background: var(--orange); transform: translateY(-2px); }

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 4rem;
  position: relative;
  z-index: 1;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  color: var(--black);
}
.stat-lbl { font-size: 12px; color: var(--gray-400); margin-top: 2px; }
.stat-div { width: 1px; height: 36px; background: var(--gray-200); }

/* ===== SECTIONS ===== */
.section-inner { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }
.section-tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--orange);
  margin-bottom: 1rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -1.5px;
  color: var(--black);
  margin-bottom: 3rem;
}

/* ===== HOW IT WORKS ===== */
.how {
  padding: 100px 0;
  background: var(--white);
}
.steps {
  display: flex;
  align-items: stretch;
  gap: 0;
}
.step {
  flex: 1;
  padding: 2rem;
  background: var(--off-white);
  border-radius: var(--radius-lg);
  position: relative;
}
.step-num {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 900;
  color: var(--gray-200);
  line-height: 1;
  margin-bottom: 1rem;
}
.step-icon { font-size: 28px; margin-bottom: 0.75rem; }
.step h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--black);
}
.step p { font-size: 14px; color: var(--gray-600); line-height: 1.6; }
.step-arrow {
  font-size: 24px;
  color: var(--gray-400);
  display: flex;
  align-items: center;
  padding: 0 1rem;
}

/* ===== CHECKER ===== */
.checker-section {
  padding: 100px 0;
  background: var(--off-white);
}

/* API KEY */
.api-key-wrap {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}
.api-key-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.key-icon { font-size: 16px; }
.get-key-link {
  color: var(--orange);
  font-weight: 500;
  text-decoration: none;
  margin-left: auto;
  font-size: 13px;
}
.get-key-link:hover { text-decoration: underline; }
.api-key-row { display: flex; gap: 10px; }
.api-key-row input {
  flex: 1;
  height: 42px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 0 14px;
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--off-white);
  color: var(--black);
  outline: none;
  transition: border-color 0.2s;
}
.api-key-row input:focus { border-color: var(--orange); }
.api-key-row button {
  height: 42px;
  padding: 0 20px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.2s;
}
.api-key-row button:hover { background: var(--orange); }
.api-key-note { font-size: 12px; color: var(--gray-400); margin-top: 8px; }
.api-key-wrap.saved { border-color: var(--green); }
.api-key-wrap.saved .api-key-label { color: var(--green); }

/* CHECKER GRID */
.checker-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

/* DROP ZONE */
.drop-zone {
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius-lg);
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: var(--white);
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  overflow: hidden;
  margin-bottom: 1.25rem;
}
.drop-zone:hover, .drop-zone.drag {
  border-color: var(--orange);
  background: var(--orange-light);
}
.drop-inner { text-align: center; padding: 2rem; }
.drop-icon-wrap { color: var(--orange); margin-bottom: 12px; display: flex; justify-content: center; }
.drop-text { font-size: 15px; font-weight: 500; color: var(--black); margin-bottom: 6px; }
.drop-sub { font-size: 13px; color: var(--gray-400); }
#img-preview {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: contain;
  display: none;
  padding: 12px;
  background: var(--white);
}
#file-input { display: none; }

/* CATEGORIES */
.category-label { font-size: 13px; color: var(--gray-600); margin-bottom: 10px; font-weight: 500; }
.tags-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 1.5rem; }
.tag {
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 99px;
  border: 1px solid var(--gray-200);
  cursor: pointer;
  color: var(--gray-600);
  background: var(--white);
  font-family: var(--font-body);
  transition: all 0.15s;
}
.tag:hover { border-color: var(--orange); color: var(--orange); }
.tag.active { background: var(--black); border-color: var(--black); color: var(--white); }

/* ANALYZE BUTTON */
.analyze-btn {
  width: 100%;
  height: 54px;
  background: var(--orange);
  color: var(--white);
  border: none;
  border-radius: 99px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  letter-spacing: 0.3px;
}
.analyze-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.analyze-btn:not(:disabled):hover { background: var(--orange-dark); transform: translateY(-1px); }
.btn-loader {
  display: none;
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.analyze-btn.loading .btn-loader { display: block; }
.analyze-btn.loading #btn-text { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* RESULTS */
.results-col { position: sticky; top: 80px; }
.results-placeholder {
  background: var(--white);
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius-lg);
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--gray-400);
  font-size: 14px;
  text-align: center;
  padding: 2rem;
}
.placeholder-icon { font-size: 36px; }

.result-card {
  display: none;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid var(--gray-200);
}

.result-top {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--gray-100);
}
.score-wrap { display: flex; align-items: baseline; gap: 4px; }
.score-num {
  font-family: var(--font-display);
  font-size: 80px;
  font-weight: 900;
  line-height: 1;
  transition: color 0.4s;
}
.score-denom {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--gray-400);
}
.verdict-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 6px;
}
.result-label { font-size: 12px; color: var(--gray-400); }

/* METER */
.meter-wrap { margin-bottom: 1.75rem; }
.meter-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--gray-400);
  margin-bottom: 6px;
}
.meter-track {
  height: 10px;
  background: var(--gray-100);
  border-radius: 99px;
  overflow: hidden;
  position: relative;
}
.meter-fill {
  height: 100%;
  border-radius: 99px;
  width: 0%;
  transition: width 1.3s cubic-bezier(.22,.68,0,1.2);
}

/* BREAKDOWN */
.breakdown-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-600);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 11px;
}
.breakdown { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 1.25rem; }
.breakdown-item {
  background: var(--off-white);
  border-radius: 10px;
  padding: 12px;
}
.breakdown-lbl { font-size: 11px; color: var(--gray-400); margin-bottom: 6px; }
.breakdown-bar-wrap { height: 4px; background: var(--gray-200); border-radius: 99px; margin-bottom: 6px; overflow: hidden; }
.breakdown-bar { height: 4px; border-radius: 99px; width: 0%; transition: width 1s ease 0.3s; }
.breakdown-val { font-size: 14px; font-weight: 500; color: var(--black); }

/* FINDINGS */
.findings-box {
  background: var(--off-white);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.findings-title {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--gray-400);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.findings-text { font-size: 14px; color: var(--gray-600); line-height: 1.7; }

/* SHARE BTN */
.share-btn {
  width: 100%;
  height: 42px;
  background: transparent;
  border: 1px solid var(--gray-200);
  border-radius: 99px;
  font-size: 14px;
  font-family: var(--font-body);
  color: var(--gray-600);
  cursor: pointer;
  transition: all 0.2s;
}
.share-btn:hover { border-color: var(--black); color: var(--black); }

/* ===== TIERS ===== */
.tiers-section {
  padding: 100px 0;
  background: var(--black);
}
.tiers-section .section-tag { color: var(--orange); }
.tiers-section .section-title { color: var(--white); }
.tiers {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.tier {
  background: var(--gray-800);
  border-radius: var(--radius);
  padding: 1.5rem 1rem;
  border-top: 3px solid var(--tc);
}
.tier-range {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--tc);
  margin-bottom: 8px;
}
.tier-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.tier-desc { font-size: 13px; color: var(--gray-400); line-height: 1.5; }

/* ===== FOOTER ===== */
.footer {
  background: var(--black);
  border-top: 1px solid var(--gray-800);
  padding: 2rem 0;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer p { font-size: 13px; color: var(--gray-600); max-width: 500px; }
.footer .logo { font-size: 18px; }

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-content > * { animation: fadeUp 0.6s ease both; }
.hero-tag { animation-delay: 0.05s; }
.hero-title { animation-delay: 0.15s; }
.hero-sub { animation-delay: 0.25s; }
.hero-cta { animation-delay: 0.35s; }
.hero-stats { animation-delay: 0.45s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .checker-grid { grid-template-columns: 1fr; }
  .results-col { position: static; }
  .steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); align-self: center; }
  .tiers { grid-template-columns: 1fr 1fr; }
  .tiers .tier:last-child { grid-column: span 2; }
}
@media (max-width: 600px) {
  .hero-stats { gap: 1rem; }
  .nav-links { display: none; }
  .tiers { grid-template-columns: 1fr; }
  .tiers .tier:last-child { grid-column: span 1; }
  .breakdown { grid-template-columns: 1fr; }
}

/* ===== BRAND MODEL INPUT ===== */
.brand-model-wrap { margin-bottom: 1.5rem; }
.bm-hint { color: var(--orange); font-size: 11px; font-weight: 400; }
#brand-model-input {
  width: 100%;
  height: 44px;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 0 14px;
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--white);
  color: var(--black);
  outline: none;
  transition: border-color 0.2s;
  margin-top: 8px;
}
#brand-model-input:focus { border-color: var(--orange); }
#brand-model-input::placeholder { color: var(--gray-400); }