:root{
  --ers-red:#990000;
  --ers-red-bright:#d62631;
  --ers-red-dark:#720000;
  --ink:#25282b;
  --muted:#6b7075;
  --line:#d9dcdf;
  --panel:#ffffff;
  --bg:#f4f5f6;
  --soft-red:#f9ecec;
  --green:#2d7a42;
  --amber:#9a6400;
  --blue:#315f8c;
  --danger:#a61b1b;
  --radius:12px;
  --shadow:0 5px 20px rgba(28,31,34,.07);
}
*{box-sizing:border-box}
html{font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--bg)}
body{margin:0;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--ers-red);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{background:#fff}
.header-inner{max-width:1180px;margin:0 auto;padding:13px 20px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:14px;color:var(--ink);text-decoration:none;min-width:0}
.brand:hover{text-decoration:none}
.brand img{width:112px;height:auto;display:block;opacity:.92}
.brand span{display:flex;flex-direction:column;line-height:1.1}
.brand strong{font-size:1.25rem;letter-spacing:.01em}
.brand small{font-size:.82rem;color:var(--muted);margin-top:5px}
.accent-line{height:4px;background:linear-gradient(90deg,var(--ers-red) 0 74%,var(--ers-red-bright) 74% 100%)}
.top-nav{display:flex;flex-wrap:wrap;gap:4px 16px;justify-content:flex-end}
.top-nav a{font-weight:700;color:#414448;padding:8px 0}
.top-nav a:hover{color:var(--ers-red);text-decoration:none}
.container{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:28px 0;flex:1}
.site-footer{border-top:1px solid var(--line);background:#fff;margin-top:auto}
.footer-inner{padding:18px 0;display:flex;justify-content:space-between;gap:20px;font-size:.9rem}
.muted{color:var(--muted)}
h1,h2,h3{margin-top:0;color:#24272a}
h1{font-size:clamp(1.65rem,3vw,2.3rem);margin-bottom:10px}
h2{font-size:1.35rem}
h3{font-size:1.05rem}
.lead{font-size:1.05rem;line-height:1.55;color:#4b4f53;max-width:800px}
.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:26px;align-items:stretch;margin-bottom:28px}
.hero-card,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-card{padding:34px}
.hero-mark{display:flex;align-items:center;justify-content:center;padding:28px;background:linear-gradient(145deg,#fff,#f0f1f2);position:relative;overflow:hidden}
.hero-mark:after{content:"";position:absolute;width:180px;height:180px;border:30px solid rgba(153,0,0,.05);border-radius:50%}
.hero-mark img{max-width:220px;width:70%;height:auto;opacity:.75;z-index:1}
.grid{display:grid;gap:18px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{padding:22px}
.card.compact{padding:16px}
.login-card{max-width:560px;margin:18px auto;background:#fff;border:1px solid var(--line);border-top:4px solid var(--ers-red);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
.role-card{display:flex;flex-direction:column;gap:10px;min-height:180px}
.role-card .icon{font-size:2rem}
.role-card .btn{margin-top:auto;align-self:flex-start}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:8px;padding:10px 15px;background:var(--ers-red);color:#fff;font-weight:700;cursor:pointer;font-size:.95rem;text-decoration:none}
.btn:hover{background:var(--ers-red-dark);text-decoration:none}
.btn.secondary{background:#555b60}
.btn.light{background:#fff;color:var(--ers-red);border:1px solid #c7c9cc}
.btn.danger{background:var(--danger)}
.btn.small{padding:7px 10px;font-size:.86rem}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
form{margin:0}
.form-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.form-group{margin-bottom:16px}
label{display:block;font-weight:700;margin-bottom:7px;font-size:.94rem}
input,select,textarea{width:100%;border:1px solid #bfc3c7;border-radius:8px;background:#fff;color:var(--ink);padding:10px 11px;font:inherit}
input:focus,select:focus,textarea:focus{outline:3px solid rgba(153,0,0,.12);border-color:var(--ers-red)}
textarea{min-height:90px;resize:vertical}
.password-wrap{position:relative}
.password-wrap input{padding-right:48px}
.password-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);border:0;background:transparent;cursor:pointer;padding:7px;font-size:1.05rem;color:#555}
.help{font-size:.86rem;color:var(--muted);margin-top:6px;line-height:1.4}
.alert{padding:13px 15px;border-radius:8px;margin-bottom:18px;border:1px solid transparent}
.alert.success{background:#eaf5ed;color:#245d34;border-color:#b8d8c1}
.alert.error{background:#fbeaea;color:#861515;border-color:#e8b7b7}
.alert.info{background:#eef4f9;color:#31536f;border-color:#c6d8e6}
.badge{display:inline-flex;align-items:center;border-radius:999px;padding:4px 9px;font-size:.8rem;font-weight:700;background:#eceeef;color:#555}
.badge.free{background:#e7f4ea;color:var(--green)}
.badge.join{background:#fff4da;color:var(--amber)}
.badge.full,.badge.cancelled{background:#fbe7e7;color:var(--danger)}
.badge.closed,.badge.locked{background:#eceeef;color:#5d6368}
.badge.mine{background:#e8f0f8;color:var(--blue)}
.toolbar{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:18px;display:flex;gap:12px;align-items:end;flex-wrap:wrap}
.toolbar .form-group{margin:0;min-width:150px;flex:1}
.day-block{margin-bottom:24px}
.day-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:10px;border-bottom:2px solid var(--ers-red);padding-bottom:8px}
.day-heading h2{margin:0;font-size:1.15rem}
.slot-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.slot{background:#fff;border:1px solid var(--line);border-left:5px solid #aeb3b7;border-radius:10px;padding:15px;display:grid;grid-template-columns:110px 1fr auto;gap:14px;align-items:center;box-shadow:0 2px 10px rgba(0,0,0,.035)}
.slot.free{border-left-color:#4d9d61}
.slot.join{border-left-color:#d69a27}
.slot.full,.slot.cancelled{border-left-color:#b42a2a}
.slot .time{font-weight:800;font-size:1rem}
.slot .topic strong{display:block;margin-bottom:4px}
.slot .meta{color:var(--muted);font-size:.88rem;line-height:1.45}
.slot .slot-action{text-align:right}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid #e3e5e7;vertical-align:top;font-size:.92rem}
th{background:#f1f2f3;font-size:.84rem;color:#50555a;text-transform:none}
tr:last-child td{border-bottom:0}
.kpi-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:18px 0 24px}
.kpi{background:#fff;border:1px solid var(--line);border-radius:10px;padding:17px}
.kpi strong{font-size:1.7rem;color:var(--ers-red);display:block;margin-bottom:4px}
.kpi span{font-size:.88rem;color:var(--muted)}
.admin-nav{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 20px}
.admin-nav a{background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 11px;color:#42474b;font-weight:700;font-size:.9rem}
.admin-nav a:hover{border-color:var(--ers-red);color:var(--ers-red);text-decoration:none}
.detail-list{display:grid;grid-template-columns:170px 1fr;gap:8px 16px;margin:0}
.detail-list dt{font-weight:700;color:#555}
.detail-list dd{margin:0}
.code-box{font-family:Consolas,Monaco,monospace;font-size:1.35rem;letter-spacing:.07em;background:#f3f4f5;border:1px dashed #999;border-radius:8px;padding:13px;text-align:center;margin:12px 0}
.empty{padding:26px;text-align:center;color:var(--muted);background:#fff;border:1px dashed #c9cdd0;border-radius:10px}
.notice{border-left:4px solid var(--ers-red);padding:12px 14px;background:#fff;border-radius:0 8px 8px 0}
.inline-form{display:inline}
hr{border:0;border-top:1px solid var(--line);margin:22px 0}
@media (max-width:900px){
  .hero{grid-template-columns:1fr}.hero-mark{display:none}
  .grid.three{grid-template-columns:1fr 1fr}
  .slot-list{grid-template-columns:1fr}
  .kpi-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .container{width:min(100% - 22px,1180px);padding:20px 0}
  .header-inner{padding:10px 12px;align-items:flex-start}
  .brand img{width:82px}.brand small{display:none}.brand strong{font-size:1.05rem}
  .top-nav{font-size:.86rem;gap:2px 10px}
  .grid.two,.grid.three,.form-row{grid-template-columns:1fr}
  .hero-card,.card,.login-card{padding:19px}
  .slot{grid-template-columns:88px 1fr;gap:10px}.slot .slot-action{grid-column:1/-1;text-align:left}.slot .slot-action .btn{width:100%}
  .kpi-grid{grid-template-columns:1fr 1fr}
  .footer-inner{flex-direction:column;gap:5px}
  .detail-list{grid-template-columns:1fr;gap:2px}.detail-list dd{margin-bottom:8px}
}

/* Startseite: genau ein Zugangspunkt mit zwei unmittelbar sichtbaren Login-Bereichen */
.welcome-strip{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:24px 28px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;gap:28px;
}
.welcome-strip h1{margin:10px 0 6px}
.welcome-strip .lead{margin:0}
.welcome-strip img{width:145px;max-height:95px;object-fit:contain;opacity:.58;flex:0 0 auto}
.login-choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;align-items:start}
.login-panel{
  background:#fff;border:1px solid var(--line);border-top:4px solid var(--ers-red);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;min-height:100%;
}
.login-panel:nth-child(2){border-top-color:#555b60}
.login-panel h2{margin:7px 0 9px;font-size:1.45rem}
.login-kicker{font-size:.82rem;font-weight:800;color:var(--ers-red);text-transform:uppercase;letter-spacing:.035em}
.login-panel:nth-child(2) .login-kicker{color:#555b60}
.login-submit{min-width:170px}
.login-footnote{font-size:.86rem;color:var(--muted);margin:16px 0 0;padding-top:14px;border-top:1px solid #eceeef;line-height:1.45}
@media (max-width:760px){
  .welcome-strip{padding:20px}.welcome-strip img{display:none}
  .login-choice-grid{grid-template-columns:1fr}
  .login-panel{padding:21px}
  .login-submit{width:100%}
}

/* v1.4 – getrennte Schüler-/Lehrkraft-Anmeldung */
.student-login-panel{max-width:680px;margin:20px auto 0}
.teacher-login-card{max-width:560px}
@media (max-width:700px){.student-login-panel{margin-top:14px}}

/* v1.5 – Datenschutzhinweise */
.privacy-card h2{margin-top:28px;margin-bottom:9px}
.privacy-card p,.privacy-card li{line-height:1.58}
.privacy-list{padding-left:22px;margin:8px 0 0}
.privacy-list li{margin-bottom:6px}
.privacy-inline{font-size:.9rem;line-height:1.5}
.footer-links{display:flex;gap:4px;align-items:center;flex-wrap:wrap}


/* v1.6 – kompakte, bündige Schülerstartseite */
.student-start-card{
  max-width:720px;
  margin:6px auto 0;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.student-start-intro{
  padding:28px 30px 24px;
}
.student-start-intro h1{
  margin:10px 0 7px;
}
.student-start-intro .lead{
  margin:0;
  max-width:none;
}
.student-login-section{
  border-top:4px solid var(--ers-red);
  padding:25px 30px 28px;
  background:#fff;
}
.student-login-section h2{
  margin:7px 0 9px;
  font-size:1.45rem;
}
.student-login-section .form-group{
  margin-top:18px;
}
/* Die alten Startseiten-Klassen bleiben für andere Seiten erhalten; auf der Schülerstartseite werden sie nicht mehr verwendet. */
@media (max-width:760px){
  .student-start-card{margin-top:0}
  .student-start-intro{padding:22px 21px 20px}
  .student-login-section{padding:21px}
  .student-login-section .login-submit{width:100%}
}

/* v1.7 – Verwaltungscode deutlich hervorheben */
.access-code-notice{
  background:#fff8dc;
  border:2px solid #d6a62c;
  border-radius:12px;
  padding:20px 22px;
  margin-bottom:20px;
  box-shadow:0 3px 14px rgba(0,0,0,.05);
}
.access-code-notice h2{margin:7px 0 8px}
.access-code-notice p{margin:0 0 10px;line-height:1.5}
.access-code-warning{font-size:.82rem;font-weight:900;text-transform:uppercase;letter-spacing:.04em;color:#8a5d00}
.access-code-notice .code-box{background:#fff;border:2px dashed #b8840f;font-size:1.55rem}
.email-note{font-size:.84rem;color:var(--muted)}