*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d1426;--bg2:#111d35;--blue:#3a9fd6;--blue2:#1a7ab8;
  --snow:#e8f4fd;--gold:#f0c040;--green:#2ecc71;--red:#e74c3c;
  --text:#dde8f5;--text-dim:#6a85b0;--card:#152038;--card2:#1c2d4a;
  --border:#1e3460;
  --font-h:'Rajdhani',sans-serif;
  --font-body:'Rajdhani',sans-serif;
  --font-m:'DM Mono',monospace;
}
html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--font-body)}

body::before{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse at 20% 20%, rgba(58,159,214,.06) 0%, transparent 60%),
  radial-gradient(ellipse at 80% 80%, rgba(26,122,184,.04) 0%, transparent 60%)}

#app{position:relative;z-index:1;height:100%}
.view{display:none;height:100%}.view.active{display:flex;flex-direction:column}

/* ── SPLASH SCREEN ── */
#view-splash{align-items:center;justify-content:center;background:var(--bg)}
.splash-logo{text-align:center;animation:splashIn .6s ease both}
@keyframes splashIn{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}
.splash-logo img{width:280px;max-width:80vw}
.splash-sub{font-family:var(--font-m);font-size:12px;color:var(--text-dim);margin-top:16px;letter-spacing:2px}

/* ── AUTH ── */
#view-login,#view-register-page{align-items:center;justify-content:center;padding:24px;overflow-y:auto}
.auth-wrap{width:100%;max-width:400px}
.logo-area{text-align:center;margin-bottom:28px}
.logo-area img{width:240px;max-width:80vw;margin-bottom:8px}
.logo-sub{font-family:var(--font-m);font-size:11px;color:var(--text-dim);letter-spacing:1px}
.auth-link{text-align:center;margin-top:16px;font-size:14px;color:var(--blue);cursor:pointer;font-family:var(--font-body)}
.auth-link:hover{text-decoration:underline}

/* ── CARD ── */
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px}

/* ── INPUTS ── */
.field-group{margin-bottom:16px}
label{display:block;font-size:11px;font-weight:600;letter-spacing:1.5px;text-transform:uppercase;color:var(--text-dim);margin-bottom:7px;font-family:var(--font-m)}
input[type=text],input[type=email],input[type=password],input[type=file],textarea,select{
  width:100%;background:var(--card2);border:1.5px solid var(--border);border-radius:9px;
  padding:11px 14px;color:var(--text);font-family:var(--font-body);font-size:15px;
  transition:border-color .2s;outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--blue)}
textarea{resize:vertical;min-height:80px}
select{cursor:pointer}

/* ── BUTTONS ── */
.btn-primary{width:100%;background:linear-gradient(135deg,var(--blue),var(--blue2));
  color:#fff;border:none;border-radius:9px;padding:13px;
  font-family:var(--font-h);font-size:16px;font-weight:700;letter-spacing:.5px;
  cursor:pointer;transition:opacity .15s,transform .1s}
.btn-primary:hover{opacity:.9}.btn-primary:active{transform:scale(.98)}
.btn-primary.btn-sm{width:auto;padding:8px 18px;font-size:14px}
.btn-secondary{background:transparent;color:var(--text-dim);border:1.5px solid var(--border);
  border-radius:9px;padding:9px 16px;font-family:var(--font-h);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}
.btn-secondary:hover{border-color:var(--blue);color:var(--text)}
.btn-secondary.btn-sm{padding:6px 12px;font-size:13px}
.btn-danger{background:rgba(231,76,60,.15);color:var(--red);border:1px solid rgba(231,76,60,.3);
  border-radius:8px;padding:7px 14px;font-size:13px;font-weight:600;cursor:pointer;font-family:var(--font-h)}
.btn-icon{background:var(--card);border:1px solid var(--border);border-radius:8px;
  width:34px;height:34px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:16px}

.error-msg{background:rgba(231,76,60,.12);border:1px solid var(--red);border-radius:8px;
  padding:10px 14px;font-size:14px;color:var(--red);margin-top:8px}
.success-msg{background:rgba(46,204,113,.12);border:1px solid var(--green);border-radius:8px;
  padding:10px 14px;font-size:14px;color:var(--green);margin-top:8px}

/* ── APP LAYOUT ── */
#view-app{flex-direction:column}
@media(min-width:768px){#view-app{flex-direction:row}}

/* ── SIDEBAR ── */
.sidebar{width:250px;background:var(--bg2);border-right:1px solid var(--border);
  display:flex;flex-direction:column;flex-shrink:0;overflow-y:auto;
  position:fixed;left:0;top:0;bottom:0;z-index:50;transform:translateX(-100%);transition:transform .25s}
.sidebar.open{transform:translateX(0)}
@media(min-width:768px){.sidebar{position:relative;transform:none}}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:49}
.sidebar-overlay.show{display:block}
@media(min-width:768px){.sidebar-overlay{display:none!important}}

.sidebar-top{padding:20px 16px;border-bottom:1px solid var(--border)}
.sidebar-logo{margin-bottom:16px}
.sidebar-logo img{width:160px;opacity:.95}
.sidebar-user{display:flex;align-items:center;gap:10px}
.user-avatar{width:36px;height:36px;background:linear-gradient(135deg,var(--blue),var(--blue2));
  border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:14px;flex-shrink:0;font-family:var(--font-h)}
.user-name{font-size:14px;font-weight:700;font-family:var(--font-h)}
.user-role{font-size:11px;color:var(--text-dim);font-family:var(--font-m)}

.nav-items{padding:12px 10px;flex:1}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:9px;
  cursor:pointer;font-size:15px;font-weight:600;color:var(--text-dim);
  transition:background .15s,color .15s;margin-bottom:2px;position:relative;
  font-family:var(--font-h);letter-spacing:.3px}
.nav-item:hover{background:var(--card);color:var(--text)}
.nav-item.active{background:linear-gradient(135deg,rgba(58,159,214,.25),rgba(26,122,184,.15));
  color:var(--blue);border-left:3px solid var(--blue)}
.nav-icon{font-size:18px;width:22px;text-align:center}
.nav-divider{height:1px;background:var(--border);margin:10px 4px}
.nav-badge{margin-left:auto;background:var(--red);color:#fff;border-radius:20px;
  padding:2px 7px;font-size:10px;font-weight:700}

/* ── MOBILE HEADER ── */
.mobile-header{display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;background:var(--bg2);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:40}
@media(min-width:768px){.mobile-header{display:none}}
.menu-btn{background:none;border:none;color:var(--text);font-size:22px;cursor:pointer;padding:4px}
.mobile-header-logo{height:28px;opacity:.95}

/* ── CONTENT ── */
.content-area{flex:1;overflow-y:auto;display:flex;flex-direction:column;min-width:0}
.page{display:none;flex-direction:column;padding:20px;flex:1}
.page.active{display:flex}
.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:10px}
.page-header h2{font-size:24px;font-weight:700;letter-spacing:.5px;font-family:var(--font-h)}

/* ── SEARCH & FILTERS ── */
.search-bar{margin-bottom:14px}
.search-bar input{border-radius:12px;padding:12px 16px;font-size:15px}
.topic-filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.diff-filters{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.topic-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:20px;
  font-size:12px;font-weight:700;cursor:pointer;border:2px solid transparent;
  transition:all .2s;font-family:var(--font-h);letter-spacing:.3px}
.topic-chip.active{border-color:currentColor}
.diff-chip{display:inline-flex;align-items:center;padding:5px 12px;border-radius:20px;
  font-size:12px;font-weight:700;cursor:pointer;border:2px solid transparent;
  transition:all .2s;font-family:var(--font-h)}
.diff-chip.active{border-color:currentColor}
.sort-bar{display:flex;align-items:center;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.sort-label{font-size:12px;color:var(--text-dim);font-family:var(--font-m)}
.sort-btn{background:var(--card);border:1px solid var(--border);border-radius:20px;
  padding:5px 14px;font-size:13px;font-weight:600;cursor:pointer;color:var(--text-dim);
  transition:all .2s;font-family:var(--font-h)}
.sort-btn.active{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ── DIFFICULTY BADGES ── */
.diff-badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;font-family:var(--font-h);letter-spacing:.3px}
.diff-einsteiger{background:rgba(46,204,113,.15);color:#2ecc71}
.diff-fortgeschritten{background:rgba(58,159,214,.15);color:#3a9fd6}
.diff-könner{background:rgba(240,192,64,.15);color:#f0c040}
.diff-experte{background:rgba(231,76,60,.15);color:#e74c3c}

/* ── EXERCISE GRID ── */
.exercise-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.exercise-card{background:var(--card);border:1px solid var(--border);border-radius:14px;
  overflow:hidden;cursor:pointer;transition:transform .2s,border-color .2s,box-shadow .2s;
  animation:fadeUp .25s ease both}
.exercise-card:hover{transform:translateY(-3px);border-color:var(--blue);
  box-shadow:0 8px 24px rgba(58,159,214,.15)}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.exercise-thumb-placeholder{width:100%;aspect-ratio:16/9;
  background:linear-gradient(135deg,var(--card2),var(--bg2));
  display:flex;align-items:center;justify-content:center;font-size:36px;position:relative}
.exercise-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.exercise-info{padding:14px}
.exercise-title{font-size:16px;font-weight:700;margin-bottom:6px;line-height:1.3;font-family:var(--font-h)}
.exercise-uploader{font-size:11px;color:var(--text-dim);font-family:var(--font-m);margin-bottom:8px}
.exercise-meta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px}
.exercise-stars{color:var(--gold);font-size:13px;font-family:var(--font-m)}
.exercise-fav{font-size:16px}

/* ── STARS ── */
.star-rating{display:flex;gap:4px}
.star{font-size:24px;cursor:pointer;transition:transform .1s;color:var(--border);user-select:none}
.star.filled{color:var(--gold)}
.star:hover{transform:scale(1.2)}

/* ── FAV BUTTON ── */
.fav-btn{background:var(--card2);border:1.5px solid var(--border);border-radius:9px;
  padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;color:var(--text-dim);
  transition:all .2s;font-family:var(--font-h)}
.fav-btn.active{background:rgba(240,192,64,.12);border-color:var(--gold);color:var(--gold)}

/* ── VIDEO MODAL ── */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.75);
  z-index:200;align-items:center;justify-content:center;padding:16px}
.modal-overlay.open{display:flex}
.video-modal{background:var(--bg2);border:1px solid var(--border);border-radius:16px;
  width:100%;max-width:700px;max-height:92vh;overflow-y:auto;animation:fadeUp .2s ease}
.video-modal-header{display:flex;align-items:flex-start;justify-content:space-between;
  padding:20px 20px 12px;gap:12px}
.video-modal-header h3{font-size:20px;font-weight:700;line-height:1.3;font-family:var(--font-h)}
.modal-close{background:none;border:none;color:var(--text-dim);font-size:22px;cursor:pointer;flex-shrink:0;padding:0 4px}
video{display:block}
.video-modal-actions{display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;flex-wrap:wrap;gap:10px}
.video-modal-desc{padding:0 20px 8px;font-size:15px;color:var(--text-dim);line-height:1.6}
.video-modal-uploader{padding:0 20px 12px;font-size:12px;color:var(--text-dim);font-family:var(--font-m)}
.video-modal-meta{padding:8px 20px 16px;font-family:var(--font-m);font-size:11px;color:var(--text-dim)}
.video-modal .field-group{padding:0 20px 16px;margin:0}

/* ── MODAL ── */
.modal{background:var(--bg2);border:1px solid var(--border);border-radius:16px;
  width:100%;max-width:440px;animation:fadeUp .2s ease}
.modal-header{display:flex;align-items:center;justify-content:space-between;
  padding:18px 20px;border-bottom:1px solid var(--border)}
.modal-header h3{font-size:18px;font-weight:700;font-family:var(--font-h)}
.modal-body{padding:20px}

/* ── UPLOAD ── */
.upload-card{max-width:600px}
.upload-zone{border:2px dashed var(--border);border-radius:12px;padding:40px 20px;
  text-align:center;cursor:pointer;transition:border-color .2s,background .2s}
.upload-zone:hover{border-color:var(--blue);background:rgba(58,159,214,.05)}
.upload-zone-icon{font-size:40px;margin-bottom:10px}
.upload-zone-text{font-size:16px;font-weight:700;margin-bottom:4px;font-family:var(--font-h)}
.upload-zone-sub{font-size:12px;color:var(--text-dim);font-family:var(--font-m)}
.progress-bar{height:8px;background:var(--border);border-radius:4px;margin:12px 0 6px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--blue2));border-radius:4px;transition:width .3s;width:0}
.progress-text{font-family:var(--font-m);font-size:12px;color:var(--text-dim);text-align:center}

/* ── INVITES ── */
.invite-card{background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:16px;margin-bottom:10px;display:flex;align-items:flex-start;gap:14px}
.qr-thumb{width:72px;height:72px;border-radius:8px;object-fit:cover;flex-shrink:0;background:white}
.invite-info{flex:1}
.invite-label{font-size:15px;font-weight:700;font-family:var(--font-h)}
.invite-code{font-family:var(--font-m);font-size:11px;color:var(--text-dim);margin-top:4px;word-break:break-all}
.invite-meta{font-size:12px;color:var(--text-dim);margin-top:6px;font-family:var(--font-m)}
.invite-actions{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}

/* ── STATS ── */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-bottom:24px}
.stat-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center}
.stat-value{font-size:30px;font-weight:700;color:var(--blue);font-family:var(--font-h)}
.stat-label{font-size:11px;color:var(--text-dim);margin-top:4px;font-family:var(--font-m)}
.section-title{font-size:13px;font-weight:700;letter-spacing:1px;text-transform:uppercase;
  color:var(--text-dim);margin-bottom:12px;font-family:var(--font-m)}
.rank-item{background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:12px 16px;margin-bottom:8px;display:flex;align-items:center;gap:12px}
.rank-num{font-family:var(--font-m);font-size:18px;font-weight:500;min-width:28px;color:var(--text-dim)}
.rank-title{font-size:15px;font-weight:700;flex:1;font-family:var(--font-h)}
.rank-meta{font-size:12px;color:var(--text-dim);font-family:var(--font-m)}

/* ── FAVORITES / REFLECTION ── */
.fav-refl-card{background:var(--card);border:1px solid var(--border);border-radius:14px;
  overflow:hidden;cursor:pointer;transition:transform .2s,border-color .2s;
  animation:fadeUp .25s ease both;display:flex;flex-direction:column}
.fav-refl-card:hover{transform:translateY(-2px);border-color:var(--blue)}
.fav-refl-info{padding:14px;flex:1}
.fav-refl-title{font-size:16px;font-weight:700;margin-bottom:6px;font-family:var(--font-h)}
.fav-refl-note{font-size:13px;color:var(--text-dim);font-style:italic;
  border-left:3px solid var(--blue);padding-left:10px;margin-top:8px;line-height:1.5}
.fav-refl-rating{color:var(--gold);font-size:13px;margin-top:6px;font-family:var(--font-m)}

/* ── APPROVE ── */
.approve-card{background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:14px 16px;margin-bottom:8px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.approve-name{font-size:15px;font-weight:700;font-family:var(--font-h)}
.approve-email{font-size:12px;color:var(--text-dim);font-family:var(--font-m)}

/* ── TOPICS ── */
.topic-card{background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:14px 16px;margin-bottom:8px;display:flex;align-items:center;gap:12px}
.topic-dot{width:14px;height:14px;border-radius:50%;flex-shrink:0}
.topic-name{font-size:15px;font-weight:700;flex:1;font-family:var(--font-h)}

/* ── SETTINGS ── */
.settings-wrap{max-width:500px}
.settings-section{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px}
.settings-section-title{font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--text-dim);margin-bottom:16px;font-family:var(--font-m)}

/* ── LOADER / EMPTY ── */
.loader{display:flex;align-items:center;gap:12px;padding:40px 20px;color:var(--text-dim);font-size:14px;justify-content:center}
.spinner{width:28px;height:28px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.empty-state{text-align:center;padding:48px 20px;color:var(--text-dim)}
.empty-emoji{font-size:48px;margin-bottom:14px}
.empty-state h3{font-size:20px;font-weight:700;color:var(--text);margin-bottom:8px;font-family:var(--font-h)}
.empty-state p{font-size:14px;line-height:1.6}

/* ── TOAST ── */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(100px);
  background:var(--card2);border:1px solid var(--border);border-radius:10px;
  padding:11px 20px;font-size:14px;z-index:300;transition:transform .3s;white-space:nowrap;
  box-shadow:0 8px 24px rgba(0,0,0,.4);font-family:var(--font-h)}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.error{border-color:var(--red);color:var(--red)}
.toast.success{border-color:var(--green);color:var(--green)}