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

:root {
  --clr-bg: #f0f4f8;
  --clr-surface: #ffffff;
  --clr-surface2: #f7fafc;
  --clr-primary: #0a6e5e;
  --clr-primary-light: #13a38f;
  --clr-primary-dark: #074d42;
  --clr-accent: #e8f5f2;
  --clr-red: #c0392b;
  --clr-orange: #e67e22;
  --clr-yellow: #f1c40f;
  --clr-green: #27ae60;
  --clr-text: #1a2332;
  --clr-muted: #64748b;
  --clr-border: #dde3ed;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(10,110,94,0.08);
  --shadow-lg: 0 12px 48px rgba(10,110,94,0.14);
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.65;
  min-height: 100vh;
}

/* ─── NAVBAR ─── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 2rem;
  padding: 0 2.5rem;
  height: 64px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
}
.nav-brand { display: flex; align-items: center; gap: 0.5rem; text-decoration: none; margin-right: auto;}
.nav-logo { font-size: 1.6rem; }
.nav-title { font-family: var(--font-display); font-size: 1.3rem; color: var(--clr-primary); }
.nav-links { display: flex; gap: 0.25rem; }
.nav-links a {
  text-decoration: none; color: var(--clr-muted); font-size: 0.92rem; font-weight: 500;
  padding: 0.4rem 0.9rem; border-radius: 8px; transition: all .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--clr-primary); background: var(--clr-accent);
}
.btn-primary {
  background: var(--clr-primary); color: #fff;
  padding: 0.45rem 1.2rem; border-radius: 8px;
  text-decoration: none; font-size: 0.9rem; font-weight: 600;
  transition: background .2s;
}
.btn-primary:hover { background: var(--clr-primary-dark); }

/* ─── HERO ─── */
.hero {
  position: relative; overflow: hidden;
  min-height: calc(100vh - 64px);
  display: flex; align-items: center;
  padding: 5rem 2.5rem 4rem;
  gap: 3rem;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
}
.hero-orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.18;
}
.orb1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #13a38f, #0a6e5e);
  top: -150px; right: -100px;
}
.orb2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #27ae60, #13a38f);
  bottom: -100px; left: 100px;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--clr-border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--clr-border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
}
.hero-content {
  position: relative; z-index: 2;
  flex: 1; max-width: 600px;
}
.hero-badge {
  display: inline-block;
  background: var(--clr-accent); color: var(--clr-primary);
  border: 1px solid rgba(10,110,94,0.2);
  padding: 0.35rem 1rem; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600; margin-bottom: 1.5rem;
  animation: fadeUp 0.6s ease both;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5vw, 4.2rem);
  line-height: 1.1; color: var(--clr-text);
  margin-bottom: 1.25rem;
  animation: fadeUp 0.7s ease 0.1s both;
}
.hero-title em { color: var(--clr-primary); font-style: italic; }
.hero-subtitle {
  color: var(--clr-muted); font-size: 1.1rem; font-weight: 400;
  max-width: 500px; margin-bottom: 2rem;
  animation: fadeUp 0.7s ease 0.2s both;
}
.hero-actions {
  display: flex; gap: 1rem; flex-wrap: wrap;
  margin-bottom: 1.5rem;
  animation: fadeUp 0.7s ease 0.3s both;
}
.btn-hero-primary {
  background: var(--clr-primary); color: #fff;
  padding: 0.85rem 2rem; border-radius: 10px;
  text-decoration: none; font-weight: 600; font-size: 1rem;
  transition: all .2s; box-shadow: 0 4px 20px rgba(10,110,94,0.3);
}
.btn-hero-primary:hover { background: var(--clr-primary-dark); transform: translateY(-2px); }
.btn-hero-secondary {
  background: #fff; color: var(--clr-primary);
  padding: 0.85rem 2rem; border-radius: 10px;
  text-decoration: none; font-weight: 600; font-size: 1rem;
  border: 2px solid var(--clr-primary);
  transition: all .2s;
}
.btn-hero-secondary:hover { background: var(--clr-accent); }
.hero-disclaimer {
  font-size: 0.78rem; color: var(--clr-muted);
  animation: fadeUp 0.7s ease 0.4s both;
}

/* HERO VISUAL */
.hero-visual {
  position: relative; flex: 1; display: flex;
  align-items: center; justify-content: center;
  min-height: 320px;
}
.pulse-ring {
  width: 280px; height: 280px; border-radius: 50%;
  border: 2px solid rgba(10,110,94,0.2);
  animation: pulse 2.5s ease-in-out infinite;
  position: absolute;
}
.pulse-ring::before {
  content: ''; position: absolute; inset: 20px; border-radius: 50%;
  border: 2px solid rgba(10,110,94,0.15);
  animation: pulse 2.5s ease-in-out 0.4s infinite;
}
@keyframes pulse {
  0%,100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.08); opacity: 0.5; }
}
.hero-card {
  position: absolute; background: #fff;
  border-radius: 14px; padding: 1rem 1.2rem;
  box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 0.8rem;
  min-width: 180px;
}
.card-float { top: 20%; left: -10%; animation: float1 4s ease-in-out infinite; }
.card-float2 { bottom: 15%; right: -5%; animation: float2 4s ease-in-out 1s infinite; }
@keyframes float1 { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes float2 { 0%,100% { transform: translateY(0); } 50% { transform: translateY(8px); } }
.hcard-icon { font-size: 1.8rem; }
.hcard-title { font-size: 0.75rem; color: var(--clr-muted); }
.hcard-val { font-size: 1.1rem; font-weight: 700; color: var(--clr-text); }
.hcard-val span { font-size: 0.75rem; font-weight: 400; color: var(--clr-muted); }
.hcard-status { font-size: 0.72rem; font-weight: 600; padding: 0.2rem 0.6rem; border-radius: 999px; }
.hcard-status.good { background: #e8f8ef; color: #27ae60; }
.hcard-status.info { background: var(--clr-accent); color: var(--clr-primary); }

/* ─── SECTIONS ─── */
.section-label {
  text-transform: uppercase; letter-spacing: 0.12em;
  font-size: 0.78rem; font-weight: 600; color: var(--clr-primary);
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.2; color: var(--clr-text);
  margin-bottom: 2.5rem;
}

/* FEATURES */
.features {
  padding: 6rem 2.5rem;
  background: var(--clr-surface);
}
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.feature-card {
  background: var(--clr-surface2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius); padding: 2rem;
  cursor: pointer; transition: all .25s;
}
.feature-card:hover {
  border-color: var(--clr-primary-light);
  box-shadow: var(--shadow-lg); transform: translateY(-4px);
}
.feat-icon { font-size: 2.2rem; margin-bottom: 1rem; }
.feature-card h3 {
  font-family: var(--font-display); font-size: 1.3rem;
  color: var(--clr-text); margin-bottom: 0.6rem;
}
.feature-card p { color: var(--clr-muted); font-size: 0.95rem; margin-bottom: 1rem; }
.feat-link { color: var(--clr-primary); font-weight: 600; font-size: 0.9rem; }

/* STATS */
.stats-section {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 2rem; padding: 4rem 2.5rem;
  background: var(--clr-primary);
}
.stat-item { text-align: center; }
.stat-num {
  font-family: var(--font-display); font-size: 2.8rem;
  color: #fff; line-height: 1;
}
.stat-label { color: rgba(255,255,255,0.7); font-size: 0.9rem; margin-top: 0.25rem; }

/* HOW IT WORKS */
.how-it-works {
  padding: 6rem 2.5rem;
  background: var(--clr-surface);
}
.steps-row {
  display: flex; align-items: flex-start;
  gap: 1rem; flex-wrap: wrap;
}
.step { flex: 1; min-width: 200px; }
.step-num {
  font-family: var(--font-display); font-size: 3rem;
  color: var(--clr-accent); color: rgba(10,110,94,0.15);
  line-height: 1; margin-bottom: 0.5rem;
}
.step h4 { font-size: 1.1rem; color: var(--clr-primary); margin-bottom: 0.4rem; font-weight: 600; }
.step p { color: var(--clr-muted); font-size: 0.92rem; }
.step-arrow { font-size: 1.5rem; color: var(--clr-border); padding-top: 2rem; }

/* FOOTER */
.footer {
  background: var(--clr-primary-dark); color: rgba(255,255,255,0.8);
  padding: 2.5rem; text-align: center;
}
.footer-brand {
  font-family: var(--font-display); font-size: 1.3rem;
  color: #fff; margin-bottom: 0.75rem;
}
.footer-disclaimer { font-size: 0.82rem; max-width: 600px; margin: 0 auto 0.75rem; }
.footer-copy { font-size: 0.78rem; opacity: 0.5; }

/* ─── PAGE HEADER (inner pages) ─── */
.page-header {
  background: linear-gradient(135deg, var(--clr-primary-dark) 0%, var(--clr-primary) 100%);
  padding: 3rem 2.5rem 2.5rem;
  color: #fff;
}
.page-header h1 { font-family: var(--font-display); font-size: 2.2rem; margin-bottom: 0.4rem; }
.page-header p { opacity: 0.8; font-size: 1rem; }

/* ─── SYMPTOM CHECKER PAGE ─── */
.checker-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 768px) { .checker-layout { grid-template-columns: 1fr; } }

.checker-panel {
  background: var(--clr-surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}
.checker-panel h2 {
  font-family: var(--font-display);
  font-size: 1.4rem; margin-bottom: 0.4rem; color: var(--clr-text);
}
.checker-panel p.sub { color: var(--clr-muted); font-size: 0.9rem; margin-bottom: 1.5rem; }

.symptom-input-area {
  width: 100%;
  border: 2px solid var(--clr-border);
  border-radius: 10px;
  padding: 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical; min-height: 130px;
  color: var(--clr-text);
  transition: border-color .2s;
  outline: none;
}
.symptom-input-area:focus { border-color: var(--clr-primary); }

.tag-area { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
.symptom-tag {
  background: var(--clr-accent); color: var(--clr-primary);
  border: 1px solid rgba(10,110,94,0.2);
  padding: 0.3rem 0.8rem; border-radius: 999px;
  font-size: 0.82rem; font-weight: 500; cursor: pointer;
  transition: all .15s;
}
.symptom-tag:hover { background: var(--clr-primary); color: #fff; }
.symptom-tag.selected { background: var(--clr-primary); color: #fff; }

.quick-label { font-size: 0.82rem; font-weight: 600; color: var(--clr-muted); margin-bottom: 0.5rem; }

.check-btn {
  width: 100%; padding: 0.9rem;
  background: var(--clr-primary); color: #fff;
  border: none; border-radius: 10px;
  font-family: var(--font-body); font-size: 1rem; font-weight: 600;
  cursor: pointer; margin-top: 1rem; transition: all .2s;
}
.check-btn:hover { background: var(--clr-primary-dark); }
.check-btn:disabled { background: var(--clr-border); cursor: not-allowed; }

/* Results */
.results-panel { min-height: 400px; }
.result-placeholder {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; height: 300px; color: var(--clr-muted);
  gap: 0.75rem;
}
.result-placeholder .big-icon { font-size: 3rem; opacity: 0.4; }

.disease-card {
  border: 1px solid var(--clr-border);
  border-radius: 12px; padding: 1.1rem 1.3rem;
  margin-bottom: 0.9rem;
  background: var(--clr-surface2);
  animation: slideIn 0.35s ease both;
  transition: box-shadow .2s;
}
.disease-card:hover { box-shadow: var(--shadow); }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}
.disease-header {
  display: flex; align-items: center;
  justify-content: space-between; margin-bottom: 0.5rem;
}
.disease-rank {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--clr-primary); color: #fff;
  font-size: 0.82rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-right: 0.75rem;
}
.disease-name {
  font-weight: 600; font-size: 1rem; color: var(--clr-text); flex: 1;
}
.severity-badge {
  font-size: 0.72rem; font-weight: 700;
  padding: 0.2rem 0.7rem; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.sev-mild { background: #e8f8ef; color: #27ae60; }
.sev-moderate { background: #fef3e2; color: #e67e22; }
.sev-severe { background: #fde8e8; color: #c0392b; }
.sev-critical { background: #c0392b; color: #fff; }

.match-bar-wrap { margin: 0.5rem 0; }
.match-label { font-size: 0.78rem; color: var(--clr-muted); margin-bottom: 3px; }
.match-bar {
  height: 6px; background: var(--clr-border); border-radius: 999px; overflow: hidden;
}
.match-fill {
  height: 100%; background: var(--clr-primary-light);
  border-radius: 999px; transition: width 0.8s ease;
}
.disease-desc { font-size: 0.87rem; color: var(--clr-muted); margin-top: 0.4rem; }
.disease-action {
  margin-top: 0.6rem; font-size: 0.82rem; font-weight: 600;
  color: var(--clr-primary);
}

.disclaimer-box {
  background: #fff8e1; border: 1px solid #f1c40f;
  border-radius: 10px; padding: 0.9rem 1rem;
  font-size: 0.82rem; color: #7d6608; margin-top: 1rem;
}

/* ─── CHATBOT PAGE ─── */
.chat-layout {
  display: flex; flex-direction: column;
  height: calc(100vh - 64px - 140px);
  max-width: 800px; margin: 0 auto;
  padding: 1.5rem 2.5rem;
  gap: 1rem;
}
.chat-window {
  flex: 1; background: var(--clr-surface);
  border-radius: var(--radius); padding: 1.5rem;
  overflow-y: auto; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 1rem;
}
.chat-msg {
  display: flex; gap: 0.75rem; align-items: flex-start;
  animation: fadeUp 0.3s ease both;
}
.chat-msg.user { flex-direction: row-reverse; }
.chat-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.chat-msg.bot .chat-avatar { background: var(--clr-primary); color: #fff; }
.chat-msg.user .chat-avatar { background: var(--clr-border); }

.chat-bubble {
  max-width: 75%; padding: 0.85rem 1.1rem;
  border-radius: 16px; font-size: 0.93rem; line-height: 1.6;
}
.chat-msg.bot .chat-bubble {
  background: var(--clr-surface2); border: 1px solid var(--clr-border);
  border-top-left-radius: 4px; color: var(--clr-text);
}
.chat-msg.user .chat-bubble {
  background: var(--clr-primary); color: #fff;
  border-top-right-radius: 4px;
}
.typing-dot {
  display: inline-block; width: 7px; height: 7px;
  border-radius: 50%; background: var(--clr-muted);
  margin: 0 2px; animation: blink 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%,80%,100% { opacity: 0.2; } 40% { opacity: 1; } }

.chat-input-row {
  display: flex; gap: 0.75rem; align-items: flex-end;
}
.chat-input {
  flex: 1; border: 2px solid var(--clr-border);
  border-radius: 12px; padding: 0.85rem 1rem;
  font-family: var(--font-body); font-size: 0.95rem;
  resize: none; outline: none; transition: border-color .2s;
  max-height: 120px;
}
.chat-input:focus { border-color: var(--clr-primary); }
.chat-send-btn {
  background: var(--clr-primary); color: #fff;
  border: none; border-radius: 12px;
  width: 48px; height: 48px; font-size: 1.2rem;
  cursor: pointer; transition: background .2s; flex-shrink: 0;
}
.chat-send-btn:hover { background: var(--clr-primary-dark); }

.quick-questions {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
  padding: 0 0 0.5rem;
}
.quick-q {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: 999px; padding: 0.35rem 0.9rem;
  font-size: 0.82rem; cursor: pointer; color: var(--clr-text);
  transition: all .15s;
}
.quick-q:hover { border-color: var(--clr-primary); color: var(--clr-primary); }

/* ─── HEALTH TIPS PAGE ─── */
.tips-layout { padding: 2.5rem; max-width: 1200px; margin: 0 auto; }
.tips-filters {
  display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 2rem;
}
.filter-btn {
  background: var(--clr-surface); border: 1px solid var(--clr-border);
  border-radius: 999px; padding: 0.4rem 1.1rem;
  font-size: 0.88rem; cursor: pointer; color: var(--clr-muted);
  font-family: var(--font-body); transition: all .15s;
}
.filter-btn.active, .filter-btn:hover {
  background: var(--clr-primary); border-color: var(--clr-primary); color: #fff;
}
.tips-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.tip-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius); padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
}
.tip-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.tip-category {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em;
  font-weight: 700; color: var(--clr-primary); margin-bottom: 0.4rem;
}
.tip-card h3 { font-size: 1.05rem; color: var(--clr-text); margin-bottom: 0.5rem; }
.tip-card p { font-size: 0.88rem; color: var(--clr-muted); line-height: 1.6; }
.tip-icon { font-size: 1.8rem; margin-bottom: 0.75rem; }

/* ─── ANIMATIONS ─── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── RESPONSIVE ─── */
@media (max-width: 640px) {
  .navbar { padding: 0 1rem; }
  .nav-links { display: none; }
  .hero { padding: 3rem 1rem; flex-direction: column; }
  .hero-visual { display: none; }
  .features, .how-it-works, .how-it-works { padding: 4rem 1rem; }
  .checker-layout, .tips-layout { padding: 1rem; }
  .chat-layout { padding: 1rem; }
}