:root {
  --bg: #ffffff;
  --bg-soft: #f5f8f6;
  --card: #ffffff;
  --text: #1a2420;
  --text-soft: #667169;
  --accent: #2f9e6e;
  --accent-soft: #e6f4ee;
  --accent2: #ff8a5c;
  --accent2-soft: #fff0e8;
  --border: #e1e6e3;
  --radius: 18px;
  --max: 1100px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(20, 40, 30, 0.08);
}

:root[data-theme="dark"] {
  --bg: #0e1512;
  --bg-soft: #171f1a;
  --card: #171f1a;
  --text: #f2f5f3;
  --text-soft: #98a39c;
  --accent: #3ecb8a;
  --accent-soft: rgba(62, 203, 138, 0.14);
  --accent2: #ff9a6e;
  --accent2-soft: rgba(255, 154, 110, 0.14);
  --border: rgba(255, 255, 255, 0.1);
  --shadow: none;
  --shadow-md: none;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

main { flex: 1 0 auto; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
img, svg { max-width: 100%; display: block; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

[data-theme="dark"] .card,
[data-theme="dark"] .faq-item,
[data-theme="dark"] .calc-panel,
[data-theme="dark"] .result-card,
[data-theme="dark"] .food-result,
[data-theme="dark"] .instructor-card {
  background: var(--bg-soft);
  box-shadow: none;
  border: 1px solid var(--border);
}

.card, .faq-item, .calc-panel, .result-card, .food-result {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent);
  z-index: 300;
  transition: width 0.1s ease-out;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}
[data-theme="dark"] .nav {
  background: rgba(14, 21, 18, 0.78);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo { display: flex; align-items: center; gap: 8px; font-size: 19px; font-weight: 700; letter-spacing: -0.02em; color: var(--text); }
.logo-dim { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  transition: color 0.2s ease;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.nav-right { display: flex; align-items: center; gap: 14px; }

.theme-toggle {
  width: 44px; height: 24px;
  border-radius: 999px;
  border: none;
  background: #e3e3e8;
  position: relative;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.theme-toggle-track { position: absolute; inset: 0; border-radius: 999px; background: #d8d8dc; transition: background 0.3s ease; }
[data-theme="dark"] .theme-toggle-track { background: #3a4540; }
.theme-toggle-thumb {
  position: absolute; top: 2px; left: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  transition: transform 0.3s ease;
}
[data-theme="dark"] .theme-toggle-thumb { transform: translateX(20px); }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

@media (max-width: 940px) {
  .menu-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-links.open { max-height: 480px; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 14px 24px; width: 100%; border-top: 1px solid var(--border); }
}

/* Hero */
.hero { position: relative; padding: 90px 24px 70px; text-align: center; overflow: hidden; }
.hero-inner { position: relative; z-index: 1; max-width: 720px; margin: 0 auto; }
.hero-glow {
  position: absolute; inset: -20% -10% auto -10%; height: 480px;
  background: radial-gradient(circle at 30% 30%, rgba(47,158,110,0.16), transparent 60%),
              radial-gradient(circle at 75% 40%, rgba(255,138,92,0.14), transparent 55%);
  z-index: 0;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 13px; font-weight: 600; padding: 7px 16px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; margin: 0 0 18px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-sub { color: var(--text-soft); font-size: 1.15rem; line-height: 1.6; margin: 0 0 34px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 26px; border-radius: 980px; font-size: 15px; font-weight: 600; border: none; cursor: pointer; transition: transform 0.2s ease, opacity 0.2s ease, background 0.2s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: 0.92; }
.btn-secondary { background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--accent-soft); }

/* Section */
.section { padding: 70px 24px; }
.section-soft { background: var(--bg-soft); }
.section-head { max-width: 620px; margin: 0 auto 44px; text-align: center; }
.section-head .eyebrow { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px; }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 700; letter-spacing: -0.02em; margin: 0 0 12px; }
.section-head p { color: var(--text-soft); font-size: 1.02rem; margin: 0; }

/* Card grid */
.grid { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }

.card { background: var(--card); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); border: 1px solid transparent; }
.card:hover { border-color: var(--border); }
.card .card-icon { width: 46px; height: 46px; border-radius: 13px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.card .card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: 1.08rem; font-weight: 650; margin: 0 0 8px; letter-spacing: -0.01em; }
.card p { color: var(--text-soft); font-size: 0.94rem; margin: 0; line-height: 1.55; }
.card .card-link { display: inline-block; margin-top: 14px; color: var(--accent); font-weight: 600; font-size: 0.9rem; }

/* Calculator components */
.calc-tabs { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin: 0 auto 40px; max-width: var(--max); }
.calc-tab {
  padding: 10px 20px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--border);
  color: var(--text-soft); font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.2s ease;
}
.calc-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.calc-panel { max-width: 760px; margin: 0 auto 60px; background: var(--card); border-radius: 24px; box-shadow: var(--shadow-md); border: 1px solid var(--border); padding: 40px; display: none; }
.calc-panel.active { display: block; }
.calc-panel h3 { font-size: 1.3rem; font-weight: 700; margin: 0 0 6px; }
.calc-panel .calc-desc { color: var(--text-soft); font-size: 0.95rem; margin: 0 0 28px; }

.calc-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--text-soft); margin-bottom: 8px; }
.field input, .field select {
  width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 15px; font-family: inherit;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }

.segmented { display: flex; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
.segmented button {
  flex: 1; padding: 11px; background: var(--bg); border: none; color: var(--text-soft);
  font-size: 14px; font-weight: 600; cursor: pointer; border-right: 1px solid var(--border);
}
.segmented button:last-child { border-right: none; }
.segmented button.active { background: var(--accent); color: #fff; }

.calc-submit { width: 100%; margin-top: 8px; justify-content: center; }

.result-card { display: none; margin-top: 28px; background: var(--accent-soft); border-radius: 18px; padding: 26px; text-align: center; }
.result-card.show { display: block; }
.result-card .result-value { font-size: 2.4rem; font-weight: 800; color: var(--accent); letter-spacing: -0.02em; }
.result-card .result-unit { font-size: 1rem; color: var(--text-soft); font-weight: 600; margin-left: 4px; }
.result-card .result-label { color: var(--text-soft); font-size: 0.9rem; margin-top: 4px; }
.result-sub-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 14px; margin-top: 20px; }
.result-sub { background: var(--bg); border-radius: 12px; padding: 14px; }
.result-sub .n { font-size: 1.2rem; font-weight: 700; }
.result-sub .l { font-size: 0.78rem; color: var(--text-soft); margin-top: 2px; }

/* Macro bar */
.macro-bar { display: flex; height: 12px; border-radius: 999px; overflow: hidden; margin-top: 20px; }
.macro-bar span { height: 100%; }
.macro-legend { display: flex; gap: 18px; justify-content: center; margin-top: 12px; flex-wrap: wrap; }
.macro-legend .item { display: flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--text-soft); }
.macro-legend .dot { width: 10px; height: 10px; border-radius: 3px; }

/* Guide list (spor, diyet turleri) */
.guide-item {
  max-width: 800px; margin: 0 auto 16px; background: var(--card); border: 1px solid var(--border);
  border-radius: 18px; padding: 28px; display: grid; grid-template-columns: 56px 1fr; gap: 20px; box-shadow: var(--shadow);
}
.guide-item .g-icon { width: 56px; height: 56px; border-radius: 14px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; }
.guide-item .g-icon svg { width: 28px; height: 28px; }
.guide-item h3 { margin: 0 0 8px; font-size: 1.12rem; font-weight: 650; }
.guide-item p { color: var(--text-soft); font-size: 0.95rem; margin: 0 0 10px; line-height: 1.6; }
.guide-item ul { color: var(--text-soft); font-size: 0.9rem; padding-left: 18px; list-style: disc; }
.guide-item ul li { margin-bottom: 4px; }
.guide-tag { display: inline-block; background: var(--accent2-soft); color: var(--accent2); font-size: 0.72rem; font-weight: 700; padding: 4px 12px; border-radius: 999px; margin-bottom: 10px; letter-spacing: 0.03em; }
@media (max-width: 600px) { .guide-item { grid-template-columns: 1fr; } }

/* Myth cards */
.myth-card { max-width: 800px; margin: 0 auto 16px; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 26px; box-shadow: var(--shadow); }
.myth-row { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 10px; }
.myth-badge { flex-shrink: 0; font-size: 0.72rem; font-weight: 800; padding: 5px 12px; border-radius: 999px; letter-spacing: 0.03em; }
.myth-badge.myth { background: rgba(255,90,90,0.12); color: #e0453f; }
.myth-badge.fact { background: var(--accent-soft); color: var(--accent); }
.myth-card p { color: var(--text-soft); font-size: 0.94rem; margin: 0; line-height: 1.6; }
.myth-card .myth-title { color: var(--text); font-weight: 650; font-size: 1rem; }

/* Food search */
.food-search-bar { max-width: 640px; margin: 0 auto 12px; display: flex; gap: 10px; }
.food-search-bar input { flex: 1; padding: 14px 18px; border-radius: 999px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 15px; }
.food-search-bar input:focus { outline: none; border-color: var(--accent); }
.food-search-tabs { max-width: 640px; margin: 0 auto 28px; display: flex; gap: 8px; justify-content: center; }
.food-hint { max-width: 640px; margin: 0 auto 30px; text-align: center; color: var(--text-soft); font-size: 0.85rem; }
.food-results { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.food-result { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; box-shadow: var(--shadow); }
.food-result .f-name { font-weight: 650; font-size: 0.98rem; }
.food-result .f-source { color: var(--text-soft); font-size: 0.78rem; margin-top: 2px; }
.food-result .f-kcal { font-weight: 800; color: var(--accent); font-size: 1.1rem; white-space: nowrap; }
.food-result .f-kcal span { font-size: 0.75rem; color: var(--text-soft); font-weight: 500; }
.food-empty, .food-loading { text-align: center; color: var(--text-soft); padding: 30px; font-size: 0.92rem; }

/* Quiz (reused pattern) */
.quiz-question { max-width: 720px; margin: 0 auto 14px; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 26px 28px; box-shadow: var(--shadow); }
.q-text { font-weight: 650; margin-bottom: 16px; font-size: 1.02rem; }
.q-num { color: var(--accent); margin-right: 8px; }
.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-option { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 12px; cursor: pointer; font-size: 0.94rem; color: var(--text-soft); transition: border-color 0.2s, background 0.2s; }
.q-option:hover { border-color: var(--accent); }
.q-option input { accent-color: var(--accent); }
.q-option.picked { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
#quiz-result { display: none; max-width: 720px; margin: 30px auto 0; background: var(--accent-soft); border-radius: 20px; padding: 40px; text-align: center; }
#quiz-result .r-title { font-size: 1.6rem; font-weight: 800; color: var(--accent); margin-bottom: 10px; }
#quiz-result p { color: var(--text-soft); }

/* Tracker */
.tracker-grid { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.tracker-card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 28px; box-shadow: var(--shadow); text-align: center; }
.ring-wrap { position: relative; width: 150px; height: 150px; margin: 0 auto 18px; }
.ring-wrap svg { transform: rotate(-90deg); }
.ring-wrap circle { transition: stroke-dashoffset 0.5s ease; }
.ring-label { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-label .n { font-size: 1.4rem; font-weight: 800; }
.ring-label .l { font-size: 0.72rem; color: var(--text-soft); }
.tracker-card h3 { margin: 0 0 4px; font-size: 1.02rem; }
.tracker-card .tr-sub { color: var(--text-soft); font-size: 0.85rem; margin-bottom: 18px; }
.tracker-controls { display: flex; gap: 8px; justify-content: center; }
.tracker-controls button { padding: 9px 16px; border-radius: 999px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font-weight: 700; cursor: pointer; font-size: 14px; }
.tracker-controls button:hover { border-color: var(--accent); color: var(--accent); }
.tracker-reset { margin-top: 30px; text-align: center; }
.tracker-reset button { background: none; border: none; color: var(--text-soft); font-size: 0.85rem; text-decoration: underline; cursor: pointer; }

/* FAQ */
.faq-item { max-width: 760px; margin: 0 auto 10px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); }
.faq-item summary { padding: 20px 24px; cursor: pointer; font-weight: 650; font-size: 0.98rem; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--accent); font-size: 1.3rem; font-weight: 400; margin-left: 16px; }
.faq-item[open] summary::after { content: "\2212"; }
.faq-item p { padding: 0 24px 22px; color: var(--text-soft); font-size: 0.94rem; line-height: 1.6; margin: 0; }

/* Disclaimer box */
.disclaimer-box { max-width: 760px; margin: 0 auto 40px; background: var(--accent2-soft); border: 1px solid rgba(255,138,92,0.25); border-radius: 16px; padding: 18px 22px; color: var(--text-soft); font-size: 0.86rem; line-height: 1.6; }
.disclaimer-box strong { color: var(--text); }

/* CTA */
.cta { background: var(--bg-soft); border-top: 1px solid var(--border); padding: 60px 24px; text-align: center; }
.cta h2 { font-size: 1.5rem; font-weight: 700; margin: 0 0 10px; }
.cta p { color: var(--text-soft); margin: 0 0 26px; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 40px 24px; text-align: center; color: var(--text-soft); font-size: 0.85rem; }
.footer .foot-links { display: flex; justify-content: center; gap: 18px; margin-bottom: 16px; flex-wrap: wrap; }
.footer .foot-links a { color: var(--text-soft); font-weight: 500; }
.footer .foot-links a:hover { color: var(--accent); }
.footer .disclaimer { max-width: 620px; margin: 14px auto 0; font-size: 0.78rem; opacity: 0.8; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }