/* ============================
   DOKU — AI FITNESS COACH CSS
   ============================ */

:root {
  --bg:          #09090f;
  --bg2:         #10101a;
  --card:        #161622;
  --card2:       #1c1c2e;
  --green:       #00ff88;
  --green-dim:   rgba(0,255,136,.12);
  --green-border:rgba(0,255,136,.22);
  --purple:      #7c3aed;
  --purple-light:#9d5cfc;
  --purple-dim:  rgba(124,58,237,.12);
  --purple-border:rgba(124,58,237,.30);
  --txt:         #ffffff;
  --txt2:        #a0a0b8;
  --muted:       #55556a;
  --border:      rgba(255,255,255,.07);
  --grad:        linear-gradient(135deg,#00ff88,#7c3aed);
  --shadow:      0 24px 64px rgba(0,0,0,.55);
  --r:           16px;
  --r-sm:        8px;
}

/* === RESET === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.6;
  overflow-x:hidden;
}
h1,h2,h3{font-weight:800;line-height:1.2}
h1{font-size:clamp(2.4rem,6vw,4.8rem)}
h2{font-size:clamp(1.8rem,4vw,3rem)}
h3{font-size:1.2rem}
p{color:var(--txt2)}
a{text-decoration:none}
button{font-family:inherit}
input,select{font-family:inherit}

/* === UTILITY === */
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.gradient-text{
  background:var(--grad);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.section-header{text-align:center;margin-bottom:56px}
.section-header h2{margin-bottom:14px}
.section-header p{max-width:480px;margin:0 auto}
.section-tag{
  display:inline-block;
  padding:5px 14px;
  background:var(--purple-dim);
  border:1px solid var(--purple-border);
  border-radius:50px;
  font-size:.75rem;
  font-weight:700;
  color:var(--purple-light);
  margin-bottom:14px;
  text-transform:uppercase;
  letter-spacing:1.2px;
}

/* === BUTTONS === */
.btn-primary{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 26px;
  background:var(--grad);
  border:none;border-radius:50px;
  color:#000;font-weight:700;font-size:.95rem;
  cursor:pointer;transition:all .25s;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,255,136,.28)}
.btn-secondary{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 26px;
  background:transparent;
  border:1px solid var(--border);border-radius:50px;
  color:var(--txt);font-weight:600;font-size:.95rem;
  cursor:pointer;transition:all .25s;
}
.btn-secondary:hover{border-color:var(--green-border);color:var(--green)}

/* === NAVBAR === */
.navbar{
  position:fixed;top:0;width:100%;z-index:999;
  padding:14px 0;
  transition:all .3s;
}
.navbar.scrolled{
  background:rgba(9,9,15,.88);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.nav-container{
  max-width:1180px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;gap:28px;
}
.nav-logo{
  display:flex;align-items:center;gap:7px;
  font-size:1.45rem;font-weight:900;letter-spacing:-.5px;
  margin-right:auto;
}
.logo-icon{font-size:1.2rem}
.logo-text{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.nav-links{display:flex;gap:26px}
.nav-links a{color:var(--txt2);font-size:.88rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--txt)}
.nav-cta{
  padding:9px 20px;
  background:var(--grad);border:none;border-radius:50px;
  color:#000;font-weight:700;font-size:.82rem;
  cursor:pointer;transition:all .2s;
}
.nav-cta:hover{opacity:.88;transform:translateY(-1px)}
.nav-hamburger{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;color:var(--txt);cursor:pointer;font-size:1rem}
.mobile-menu{
  display:none;flex-direction:column;
  background:var(--bg2);
  border-top:1px solid var(--border);
  padding:12px 24px;
}
.mobile-menu a{padding:10px 0;color:var(--txt2);font-size:.95rem;border-bottom:1px solid var(--border)}
.mobile-menu a:last-child{border-bottom:none}
.mobile-menu.open{display:flex}

/* === HERO === */
.hero{
  min-height:100vh;display:flex;align-items:center;
  padding:120px 24px 80px;
  max-width:1180px;margin:0 auto;
  gap:56px;
  position:relative;
}
.hero-bg{position:fixed;inset:0;pointer-events:none;z-index:-1}
.hero-orb{position:absolute;border-radius:50%;filter:blur(90px);opacity:.13}
.orb-1{width:600px;height:600px;background:var(--green);top:-180px;left:-180px}
.orb-2{width:500px;height:500px;background:var(--purple);bottom:-200px;right:-100px}
.orb-3{width:280px;height:280px;background:#06b6d4;top:40%;right:32%;opacity:.07}
.hero-content{flex:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 16px;
  background:var(--green-dim);border:1px solid var(--green-border);
  border-radius:50px;font-size:.82rem;font-weight:600;color:var(--green);
  margin-bottom:22px;
}
.badge-dot{width:8px;height:8px;background:var(--green);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}
.hero-title{margin-bottom:18px}
.hero-subtitle{font-size:1.05rem;max-width:490px;margin-bottom:34px;line-height:1.8}
.prototype-note{
  display:inline-block;
  margin-bottom:20px;
  padding:8px 14px;
  border-radius:10px;
  border:1px solid var(--green-border);
  background:var(--green-dim);
  color:var(--green);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.5px;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:46px}
.hero-stats{display:flex;align-items:center;gap:22px}
.stat-num{display:block;font-size:1.4rem;font-weight:900}
.stat-label{display:block;font-size:.75rem;color:var(--muted);margin-top:1px}
.stat-divider{width:1px;height:38px;background:var(--border)}
/* phone mockup */
.hero-visual{flex:0 0 auto}
.phone-mockup{
  width:272px;
  background:var(--card);border:1px solid var(--border);
  border-radius:26px;padding:14px;
  box-shadow:var(--shadow),0 0 0 1px rgba(255,255,255,.04),inset 0 1px 0 rgba(255,255,255,.06);
}
.phone-screen{background:var(--bg2);border-radius:18px;overflow:hidden}
.app-header{padding:13px 15px;font-size:.82rem;font-weight:700;border-bottom:1px solid var(--border)}
.workout-card{padding:10px}
.exercise-item{
  display:flex;align-items:center;gap:11px;
  padding:9px 10px;border-radius:9px;
  background:rgba(255,255,255,.025);margin-bottom:5px;
}
.ex-icon{font-size:1rem}
.ex-name{font-size:.78rem;font-weight:600}
.ex-sets{font-size:.68rem;color:var(--muted);margin-top:1px}
.ex-check{margin-left:auto;font-size:.78rem;font-weight:700}
.ex-check.done{color:var(--green)}
.ex-check.doing{color:#f59e0b}
.ex-check.upcoming{color:var(--muted)}
.progress-bar-container{padding:10px 12px 14px}
.progress-label{display:flex;justify-content:space-between;font-size:.68rem;margin-bottom:6px;color:var(--txt2)}
.progress-label span{color:var(--green);font-weight:700}
.progress-bar{height:5px;background:rgba(255,255,255,.08);border-radius:3px;overflow:hidden}
.progress-fill{height:100%;background:var(--grad);border-radius:3px}

/* === SECTIONS SHARED === */
section{padding:96px 0}

/* === FEATURES === */
.features{background:var(--bg2)}
.features-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:18px;
}
.feature-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--r);padding:28px 30px;
  transition:all .3s;
}
.feature-card:hover{transform:translateY(-4px);border-color:var(--green-border);box-shadow:0 20px 48px rgba(0,0,0,.35)}
.feature-card.featured{border-color:var(--purple-border);background:linear-gradient(135deg,var(--purple-dim),var(--card))}
.feature-icon{
  width:50px;height:50px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.4rem;margin-bottom:18px;
}
.feature-card h3{margin-bottom:9px;font-size:1.05rem}
.feature-card p{font-size:.88rem;line-height:1.75}

/* === CHAT === */
.chat-section{background:var(--bg)}
.chat-container{
  max-width:680px;margin:0 auto;
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--r);overflow:hidden;
  box-shadow:var(--shadow);
}
.chat-header{
  display:flex;align-items:center;gap:11px;
  padding:15px 18px;
  background:var(--card2);border-bottom:1px solid var(--border);
}
.chat-avatar{
  width:42px;height:42px;background:var(--grad);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;color:#000;font-weight:700;flex-shrink:0;
}
.chat-name{font-weight:700;font-size:.92rem}
.chat-status{font-size:.76rem;color:var(--muted);display:flex;align-items:center;gap:5px;margin-top:1px}
.status-dot{width:7px;height:7px;background:var(--green);border-radius:50%;animation:pulse 2s infinite}
.clear-btn{
  margin-left:auto;
  padding:5px 13px;
  background:rgba(255,255,255,.04);border:1px solid var(--border);
  border-radius:7px;color:var(--muted);font-size:.78rem;cursor:pointer;transition:all .2s;
}
.clear-btn:hover{color:var(--txt)}
.chat-messages{
  height:390px;overflow-y:auto;
  padding:18px;display:flex;flex-direction:column;gap:14px;
}
.chat-messages::-webkit-scrollbar{width:4px}
.chat-messages::-webkit-scrollbar-track{background:transparent}
.chat-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}
.message{display:flex;gap:10px;animation:fadeUp .3s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.msg-avatar{
  width:34px;height:34px;min-width:34px;
  background:var(--grad);border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:.95rem;color:#000;font-weight:700;
}
.user-message{flex-direction:row-reverse}
.user-message .msg-avatar{background:linear-gradient(135deg,#7c3aed,#9d5cfc)}
.msg-bubble{
  max-width:82%;background:var(--card2);
  border:1px solid var(--border);border-radius:14px;
  padding:11px 15px;font-size:.875rem;line-height:1.65;
}
.user-message .msg-bubble{
  background:linear-gradient(135deg,rgba(124,58,237,.18),rgba(157,92,252,.09));
  border-color:var(--purple-border);
}
.msg-bubble p{color:var(--txt2);margin-bottom:5px}
.msg-bubble p:last-child{margin-bottom:0}
.msg-bubble strong{color:var(--txt)}
.quick-options{display:flex;flex-wrap:wrap;gap:7px;margin-top:11px}
.quick-options button{
  padding:7px 13px;
  background:var(--green-dim);border:1px solid var(--green-border);
  border-radius:50px;color:var(--green);font-size:.77rem;font-weight:600;
  cursor:pointer;transition:all .2s;
}
.quick-options button:hover{background:rgba(0,255,136,.2)}
.typing-indicator{display:flex;gap:4px;padding:2px 0}
.typing-dot{
  width:7px;height:7px;background:var(--muted);
  border-radius:50%;animation:bounce 1.2s infinite;
}
.typing-dot:nth-child(2){animation-delay:.2s}
.typing-dot:nth-child(3){animation-delay:.4s}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}
.chat-input-area{
  display:flex;gap:9px;padding:14px 18px;
  background:var(--card2);border-top:1px solid var(--border);
}
.chat-input-area input{
  flex:1;background:var(--card);border:1px solid var(--border);
  border-radius:50px;padding:11px 18px;
  color:var(--txt);font-size:.875rem;outline:none;
  transition:border-color .2s;
}
.chat-input-area input:focus{border-color:var(--green-border)}
.chat-input-area input::placeholder{color:var(--muted)}
.send-btn{
  width:42px;height:42px;background:var(--grad);
  border:none;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;color:#000;transition:all .2s;flex-shrink:0;
}
.send-btn:hover{transform:scale(1.06)}

/* === WORKOUT GENERATOR === */
.workout-section{background:var(--bg2)}
.generator-container{
  max-width:680px;margin:0 auto;
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--r);padding:36px;
  box-shadow:var(--shadow);
}
.form-group{margin-bottom:26px}
.form-group label{
  display:block;font-size:.78rem;font-weight:700;
  color:var(--txt2);margin-bottom:11px;
  text-transform:uppercase;letter-spacing:.8px;
}
.option-grid{display:flex;flex-wrap:wrap;gap:9px}
.option-btn{
  padding:9px 17px;
  background:var(--bg2);border:1px solid var(--border);
  border-radius:50px;color:var(--txt2);font-size:.875rem;font-weight:500;
  cursor:pointer;transition:all .2s;
}
.option-btn:hover{border-color:var(--green-border);color:var(--txt)}
.option-btn.active{background:var(--green-dim);border-color:var(--green-border);color:var(--green)}
.slider-container{display:flex;align-items:center;gap:16px}
.slider-container input[type=range]{
  flex:1;-webkit-appearance:none;
  height:4px;background:var(--border);border-radius:2px;outline:none;cursor:pointer;
}
.slider-container input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;
  width:18px;height:18px;background:var(--green);border-radius:50%;cursor:pointer;
}
#daysValue{font-size:.88rem;color:var(--green);font-weight:700;white-space:nowrap;min-width:88px}
.generate-btn{width:100%;justify-content:center;font-size:1rem}
/* result */
.result-header{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.result-header h3{flex:1;font-size:.95rem}
.back-btn,.copy-btn{
  padding:7px 14px;background:var(--bg2);border:1px solid var(--border);
  border-radius:7px;color:var(--txt2);font-size:.82rem;cursor:pointer;transition:all .2s;
}
.back-btn:hover,.copy-btn:hover{color:var(--txt)}
.day-plan{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-sm);padding:18px;margin-bottom:10px;
}
.day-plan h4{font-size:.78rem;color:var(--green);margin-bottom:11px;text-transform:uppercase;letter-spacing:1px}
.exercise-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:7px 0;border-bottom:1px solid var(--border);font-size:.875rem;
}
.exercise-row:last-child{border-bottom:none}
.ex-detail{color:var(--muted);font-size:.78rem}

/* === BMI CALCULATOR === */
.bmi-section{background:var(--bg)}
.bmi-container{
  max-width:820px;margin:0 auto;
  display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;
}
.bmi-form{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--r);padding:30px;
}
.unit-toggle{
  display:flex;background:var(--bg2);border-radius:50px;
  padding:4px;margin-bottom:22px;
}
.unit-btn{
  flex:1;padding:7px;background:transparent;border:none;
  border-radius:50px;color:var(--muted);font-size:.78rem;cursor:pointer;transition:all .2s;
}
.unit-btn.active{background:var(--card);color:var(--txt);font-weight:700}
.bmi-inputs{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:4px}
.input-group{margin-bottom:14px}
.input-group label{display:block;font-size:.78rem;color:var(--txt2);margin-bottom:7px;font-weight:500}
.input-group input,.input-group select{
  width:100%;padding:11px 14px;
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--r-sm);color:var(--txt);font-size:.875rem;outline:none;
  transition:border-color .2s;
}
.input-group input:focus,.input-group select:focus{border-color:var(--green-border)}
.input-group select option{background:var(--card)}
.bmi-result{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--r);padding:30px;text-align:center;
  box-shadow:var(--shadow);
}
.bmi-score-container{margin-bottom:20px}
.bmi-gauge{display:block;margin:0 auto 10px}
.bmi-number{font-size:2.8rem;font-weight:900;margin-bottom:3px}
.bmi-category{font-size:.95rem;font-weight:700}
.bmi-breakdown{text-align:left;margin-bottom:18px}
.bmi-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:8px 0;font-size:.83rem;border-bottom:1px solid var(--border);
}
.bmi-row:last-child{border-bottom:none}
.bmi-row span:first-child{color:var(--txt2)}
.bmi-row span:last-child{font-weight:700}
.bmi-advice{
  background:var(--green-dim);border:1px solid var(--green-border);
  border-radius:var(--r-sm);padding:15px;
  font-size:.83rem;color:var(--txt2);text-align:left;line-height:1.75;
}

/* === FOOTER === */
.footer{background:var(--bg2);border-top:1px solid var(--border);padding:56px 0 28px}
.footer-content{display:flex;gap:52px;margin-bottom:36px;flex-wrap:wrap}
.footer-brand{flex:2}
.footer-brand p{margin-top:11px;font-size:.88rem;max-width:260px}
.footer-links{flex:1;min-width:130px}
.footer-links h4{font-size:.78rem;margin-bottom:15px;text-transform:uppercase;letter-spacing:1px}
.footer-links a{display:block;color:var(--muted);font-size:.84rem;margin-bottom:9px;transition:color .2s}
.footer-links a:hover{color:var(--txt)}
.footer-bottom{border-top:1px solid var(--border);padding-top:22px;font-size:.78rem;color:var(--muted);text-align:center}

/* === SCROLL ANIMATIONS === */
.anim-el{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.anim-el.visible{opacity:1;transform:translateY(0)}

/* === RESPONSIVE === */
@media(max-width:900px){
  .hero{flex-direction:column;text-align:center;padding-top:100px}
  .hero-subtitle{max-width:100%}
  .hero-actions{justify-content:center}
  .hero-stats{justify-content:center}
  .hero-visual{display:none}
}
@media(max-width:700px){
  .nav-links,.nav-cta{display:none}
  .nav-hamburger{display:block}
  .features-grid{grid-template-columns:1fr}
  .bmi-container{grid-template-columns:1fr}
  .bmi-inputs{grid-template-columns:1fr}
  .footer-content{flex-direction:column;gap:28px}
  .generator-container{padding:22px}
  h1{font-size:2.2rem}
  h2{font-size:1.7rem}
}