:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --muted:#6b7280;
  --accent:#2563eb;
  --number-accent:#10b981;
}
*{box-sizing:border-box}
/* Ensure clickable elements show pointer cursor */
a[href], button, [role="button"]{cursor:pointer}
body{font-family:Inter,ui-sans-serif,system-ui,Segoe UI,Roboto,"Helvetica Neue",Arial; background:var(--bg); margin:0; color:#111}
#sidebar{position:fixed;left:0;top:0;bottom:0;width:220px;padding:18px 12px;background:#fff;border-right:1px solid #eef2f7;display:flex;flex-direction:column;gap:8px;z-index:900}
#sidebar .brand{display:block;padding:0 6px 8px}
#sidebar .brand img{height:44px}
#sidebar .side-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid transparent;border-radius:12px;background:#fff;color:#111;text-decoration:none;font-size:16px;font-weight:500}
#sidebar button.side-item{font:inherit}
#sidebar .side-item span{font-size:16px}
#sidebar .side-item img{width:28px;height:28px}
#sidebar .side-item.active{border-color:#e3cc00;font-weight:700}
#sidebar .side-item:hover{background:#fafafa}
main{margin-left:220px}
header{margin-left:190px}
/* Hide auth link by default to avoid flicker; JS will show it if user is not logged in */
#nav-auth{display:none}
header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px}
header img[alt="GermanCards"]{height:60px}
.header-title{font-weight:700;font-size:18px}
@media (min-width: 801px){ header img[alt="GermanCards"]{display:none} }
/* User chip */
.user-chip{display:inline-flex;align-items:center;gap:8px;background:var(--card);border:1px solid #e5e7eb;padding:6px 10px;border-radius:999px;box-shadow:0 2px 8px rgba(2,6,23,0.06)}
.user-chip .avatar{width:24px;height:24px;border-radius:999px;background:linear-gradient(180deg,#3b82f6,#2563eb);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:12px}
.user-chip .name{font-weight:600}
main{display:flex;gap:24px;padding:0 32px 40px}
#practice{flex:2}
#calendar{flex:1}
/* Hidden by default; JS shows it for logged-in users to avoid flicker */
#calendar{display:none}
#words-page{padding:0 32px 40px;max-width:840px;margin:0 auto}
#user-page{max-width:900px;margin:0 auto}
#user-page, #auth-page{margin-left:220px}
#user-page h2.section-title-mobile{text-align:center}
#user-page #words-list{max-width:760px}
#user-page .profile-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin:10px 0 16px}
#user-page .profile-stats .stat{background:var(--card);border:1px solid #eef2f7;border-radius:12px;box-shadow:0 8px 24px rgba(16,24,40,0.08);padding:12px}
#user-page .profile-stats .stat-label{color:var(--muted);font-size:13px;margin-bottom:6px}
#user-page .profile-stats .stat-value{font-size:20px;font-weight:700}
#words-list{display:grid;gap:10px}
.word-row{background:var(--card);padding:12px 14px;border-radius:12px;display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:12px;box-shadow:0 8px 24px rgba(16,24,40,0.08);border:1px solid #eef2f7}
.word-main{font-size:16px;display:flex;gap:10px;flex-wrap:wrap}
.word-acc{color:var(--muted);width:72px;text-align:right}
.word-part .art{color:var(--muted);margin-right:4px;font-weight:600}
.word-part .noun{font-weight:700}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:12px}
.card{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(16,24,40,0.06);display:flex;justify-content:space-between;align-items:center}
.card{background:transparent;padding:0;border-radius:10px;position:relative;display:block;perspective:900px;overflow:hidden;min-height:120px}
.card .card-inner{width:100%;height:100%;display:block;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.85,.32,1)}
.card .card-front,.card .card-back{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(16,24,40,0.06);min-height:110px;display:flex;align-items:center;gap:12px}
.card .info{display:flex;flex-direction:column;min-width:220px;max-width:420px}
.card .controls{display:flex;gap:14px;align-items:center;margin-left:auto}
.card .card-front{position:relative;z-index:2;backface-visibility:hidden;width:100%;height:100%;transform:rotateY(0deg)}
.card .card-back{position:absolute;left:0;top:0;width:100%;height:100%;transform:rotateY(180deg);backface-visibility:hidden;justify-content:space-between}
.card.flipped .card-inner{transform:rotateY(180deg)}

.card .card-back .back-left,.card .card-back .back-right{display:flex;flex-direction:column;gap:6px;align-items:flex-start;width:36%}
.card .card-back .back-middle{width:28%;display:flex;justify-content:center;align-items:center;font-weight:700;color:var(--accent)}
.back-article{color:var(--muted);font-weight:600}
.back-noun{font-size:18px;font-weight:700}
.gender-masc{color:#1e40af}
.gender-fem{color:#be185d}
.gender-neut{color:#047857}
.back-play{background:transparent;border:none;cursor:pointer;font-size:18px}
.card .de-word{font-size:20px;font-weight:700;margin-bottom:6px}
.card .en-word{font-size:14px;color:var(--muted);margin-bottom:4px}
.de-line{display:flex;gap:8px;align-items:baseline}
.de-article{color:var(--muted);font-weight:600}
.correct-choice{outline:2px solid rgba(34,197,94,0.18);box-shadow:0 6px 18px rgba(16,185,129,0.08)}
.solved .de-article{color:var(--accent)}
.choice{background:#fff;border-radius:8px;padding:6px 8px;border:none;cursor:pointer}
.gender-group .choice{background:transparent}
.gender-vertical{flex-direction:column;padding:4px}
.gender-dot{width:22px;height:22px;border-radius:999px;border:none;cursor:pointer}
.gender-dot[data-value="masc"]{background:linear-gradient(180deg,#3b82f6,#2563eb)}
.gender-dot[data-value="fem"]{background:linear-gradient(180deg,#fb7185,#f472b6)}
.gender-dot[data-value="neut"]{background:linear-gradient(180deg,#34d399,#10b981)}
.gender-dot{width:22px;height:22px;border-radius:999px;border:none;cursor:pointer;transition:transform .15s,box-shadow .18s,outline-color .15s;position:relative;display:inline-flex;align-items:center;justify-content:center}
.gender-dot.selected{transform:translateY(-4px) scale(1.12);box-shadow:0 16px 40px rgba(2,6,23,0.18)}
.gender-dot[data-value="masc"].selected{box-shadow:0 16px 40px rgba(59,130,246,0.24);outline:5px solid rgba(59,130,246,0.16)}
.gender-dot[data-value="fem"].selected{box-shadow:0 16px 40px rgba(244,114,182,0.24);outline:5px solid rgba(244,114,182,0.16)}
.gender-dot[data-value="neut"].selected{box-shadow:0 16px 40px rgba(16,185,129,0.24);outline:5px solid rgba(16,185,129,0.16)}
.gender-dot.selected::after{content:'✓';position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:white;font-size:11px;font-weight:700;text-shadow:0 1px 2px rgba(0,0,0,0.35)}
.number-group .choice{background:rgba(16,185,129,0.08);color:var(--number-accent)}
.choice.selected{transform:translateY(-3px) scale(1.06);box-shadow:0 10px 28px rgba(2,6,23,0.12)}
.number-icon{font-size:18px;padding:10px 12px;border-radius:10px}
.number-icon.selected{background:linear-gradient(180deg,#34d399,#10b981);color:white;box-shadow:0 10px 30px rgba(16,185,129,0.22);transform:translateY(-3px) scale(1.06)}
.card.correct{animation:popCorrect 360ms ease forwards}
.card.incorrect{animation:shake 420ms ease}
@keyframes popCorrect{0%{transform:scale(1)}50%{transform:scale(1.06)}100%{transform:scale(1)}}
@keyframes shake{0%{transform:translateX(0)}25%{transform:translateX(-6px)}50%{transform:translateX(6px)}75%{transform:translateX(-4px)}100%{transform:translateX(0)}}

.group{display:flex;gap:10px;margin-right:4px}
.btn{background:var(--accent);color:white;padding:8px 12px;border-radius:8px;border:none;cursor:pointer}
.small-btn{background:transparent;border:none;cursor:pointer;color:var(--accent)}
.front-play{background:transparent;border:none;color:var(--accent);cursor:pointer;font-size:18px;align-self:flex-start;margin-top:6px}
#cal{background:var(--card);padding:12px;border-radius:8px}
footer{padding:20px 32px;color:var(--muted);margin-left:220px}

/* Simple card wrapper for grid actions */
.card-like{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(16,24,40,0.06);display:flex;justify-content:center;align-items:center}

/* Practice progress */
#practice-progress{max-width:720px}
#practice-progress-bar{background:#e5e7eb}
#practice-progress-fill{background:linear-gradient(90deg,#34d399,#10b981)}

#completion-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(6,8,15,0.4);z-index:1200}
.completion-card{background:var(--card);padding:28px;border-radius:12px;box-shadow:0 12px 40px rgba(2,6,23,0.32);text-align:center;max-width:420px}
.completion-card h2{margin:0 0 8px}
.completion-card p{color:var(--muted);margin:0 0 16px}
.completion-card .btn{width:100%}
.completion-card.hide{opacity:0;transform:translateY(8px)}

.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--card);padding:18px 20px;border-radius:12px;box-shadow:0 10px 30px rgba(2,6,23,0.25);z-index:1300;min-width:280px;text-align:center}
.toast h3{margin:0 0 8px}
.toast p{margin:0;color:var(--muted)}

.auth-grid{display:grid;grid-template-columns:repeat(2, minmax(260px, 1fr));gap:16px;max-width:840px}
.auth-grid form{display:flex;flex-direction:column;gap:8px}
.auth-grid input{padding:8px 10px;border-radius:8px;border:1px solid #e5e7eb}

/* Profile mode selector styling */
#stats-mode{appearance:none;border:1px solid #e5e7eb;border-radius:8px;padding:8px 10px;background:#fff;box-shadow:0 2px 6px rgba(2,6,23,0.04)}
#stats-mode:focus{outline:2px solid rgba(16,185,129,0.35)}

/* Tooltip */
.tooltip{position:fixed;z-index:1400;background:#0f172a;color:#fff;padding:6px 8px;border-radius:8px;font-size:12px;box-shadow:0 10px 30px rgba(2,6,23,0.25);pointer-events:none;opacity:0;transform:translate(-50%, -10px);transition:opacity .12s, transform .12s}
.tooltip.show{opacity:1;transform:translate(-50%, 0)}
.tooltip::after{content:"";position:absolute;left:50%;bottom:-5px;transform:translateX(-50%);border:6px solid transparent;border-top-color:#0f172a}


/* New auth card (login-first) */
.auth-container{display:flex;align-items:flex-start;justify-content:center;min-height:calc(100vh - 160px);padding-top:40px}
.auth-card{background:#fff;border:1px solid #eef2f7;border-radius:16px;box-shadow:0 20px 60px rgba(2,6,23,0.12);padding:32px;max-width:520px;width:100%}
.auth-title{margin:0 0 6px;font-size:28px}
.auth-subtitle{margin:0 0 16px;color:var(--muted)}
.auth-views{display:block}
.auth-view{display:flex;flex-direction:column;gap:10px}
.auth-view input{padding:12px 14px;border-radius:12px;border:1px solid #e5e7eb;background:#fff}
.auth-meta{display:flex;align-items:center;justify-content:space-between;margin-top:4px;font-size:14px}
.auth-meta .remember{display:flex;align-items:center;gap:6px;color:#374151}
.auth-submit{width:100%;margin-top:6px}
.auth-footer{margin-top:10px;text-align:center;color:#64748b;font-size:14px}
.auth-footer a{color:var(--accent);text-decoration:none}

@media (max-width: 800px){
  #sidebar{position:fixed;left:0;right:0;bottom:0;top:auto;height:64px;width:auto;flex-direction:row;justify-content:space-around;border-right:none;border-top:1px solid #eef2f7;padding:6px 8px}
  #sidebar .side-item{flex-direction:column;padding:6px 8px;border-radius:10px;justify-content:center}
  #sidebar .side-item span{display:none}
  #sidebar .brand{display:none}
  header,main{margin-left:0}
  #user-page, #auth-page{margin-left:0}
  footer{margin-left:0;padding-bottom:84px}
  .auth-card{padding:20px;border-radius:14px}
}

/* Mobile responsive tweaks */
@media (max-width: 800px){
  header{padding:12px 16px;flex-wrap:wrap;gap:8px}
  header img[alt="GermanCards"]{height:56px}
  main{flex-direction:column;gap:16px;padding:0 16px 24px}
  #practice,#calendar{flex:none;width:100%}
  .cards{grid-template-columns:1fr;gap:10px}
  .card .card-front,.card .card-back{min-height:100px;padding:12px}
  .card .info{min-width:0;max-width:100%}
  .card .de-word{font-size:18px}
  .card .en-word{font-size:13px}
  .group{gap:12px}
  .front-play{font-size:38px;line-height:1}
  .gender-vertical{padding:2px}
  .gender-dot{width:35px;height:35px}
  .number-icon{padding:12.8px 16px;font-size:27.2px}
  #words-page{padding:0 16px 24px;max-width:100%}
  .word-row{grid-template-columns:1fr auto auto;padding:10px 12px;gap:8px}
  .word-acc{width:56px;font-size:13px}
  .word-main{font-size:15px}
  #cal{padding:10px}
  .completion-card{max-width:90vw;padding:20px}
  /* Sticky progress bar on mobile */
  #practice-progress{position:sticky;top:0;z-index:400;background:var(--bg);padding-top:6px;padding-bottom:6px;margin-top:0}
}