:root{--green:#0b5a44;--green2:#14745a;--greenSoft:#edf7f3;--yellow:#f8b810;--yellowSoft:#fff7d7;--bg:#f5f8f7;--white:#fff;--text:#17372d;--muted:#72807b;--line:#dfe8e5;--danger:#b42318;font-family:Tahoma,Arial,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,input,textarea{font:inherit}.auth-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 85% 10%,rgba(248,184,16,.13),transparent 26%),linear-gradient(180deg,#f9fbfa,#f2f7f5)}.auth-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-top:5px solid var(--yellow);border-radius:22px;padding:32px;box-shadow:0 16px 45px #0b5a4417}.auth-logo{height:72px;width:auto;display:block;margin:0 auto 16px}.auth-card h1{text-align:center;margin:0}.auth-card p{text-align:center;color:var(--muted);margin:8px 0 22px}.auth-card label{display:block;font-weight:700;font-size:13px;margin:13px 0 6px}.auth-card input{width:100%;border:1px solid #d3dfdb;border-radius:11px;padding:12px 13px;outline:none}.auth-card input:focus{border-color:var(--green);box-shadow:0 0 0 3px #0b5a4414}.btn{border:0;border-radius:10px;padding:10px 14px;cursor:pointer;font-weight:700}.btn-green{background:var(--green);color:#fff;box-shadow:inset 0 -3px 0 var(--yellow)}.btn-yellow{background:var(--yellow);color:var(--green)}.btn-light{background:#fff;color:var(--green);border:1px solid var(--line)}.auth-card .btn-green{width:100%;margin-top:16px}.link-btn{width:100%;background:transparent;border:0;color:var(--green);margin-top:12px;cursor:pointer}.demo-box{margin-top:18px;padding:12px;background:var(--yellowSoft);border:1px solid rgba(248,184,16,.38);border-radius:11px;display:grid;gap:4px;color:var(--muted);font-size:12px}.error-box{color:var(--danger);font-size:12px;margin-top:9px}.site-header{background:#fff;border-bottom:1px solid var(--line);padding:12px 22px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}.brand-wrap{display:flex;align-items:center;gap:10px}.brand-logo{height:42px;width:auto}.brand-wrap strong,.brand-wrap small{display:block}.brand-wrap small{color:var(--muted)}.header-user{display:flex;align-items:center;gap:12px;color:var(--muted)}.content-wrap{max-width:1000px;margin:24px auto 60px;padding:0 16px}.hero-card{background:#fff;border:1px solid var(--line);border-top:5px solid var(--yellow);border-radius:17px;text-align:center;padding:28px 20px;box-shadow:0 8px 24px #0b5a440d}.hero-card h1{margin:7px 0 3px}.hero-card p{margin:0;color:var(--muted)}.eyebrow{display:inline-block;background:var(--yellowSoft);border:1px solid rgba(248,184,16,.4);color:var(--green);font-weight:800;border-radius:999px;padding:3px 10px;font-size:13px}.section-heading{text-align:center;margin:30px 0 12px}.section-heading h2{margin:0}.section-heading h2:after{content:"";display:block;width:42px;height:4px;background:var(--yellow);border-radius:99px;margin:7px auto 0}.section-heading p{color:var(--muted);margin:6px 0 0;font-size:13px}.schedule-card,.class-card,.chat-card,.admin-panel-card{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 7px 24px #0b5a440a}.schedule-card{padding:16px;border-top:4px solid var(--yellow)}.schedule-placeholder{min-height:250px;border:1px dashed #cbd9d4;border-radius:13px;display:grid;place-items:center;align-content:center;gap:7px;color:var(--muted);background:linear-gradient(180deg,#fff,#f8fbfa)}.schedule-placeholder strong{color:var(--green)}.class-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.class-card{text-align:center;padding:22px}.class-icon{width:76px;height:76px;margin:0 auto;display:grid;place-items:center;border-radius:22px;background:linear-gradient(145deg,var(--greenSoft),var(--yellowSoft));font-size:32px}.class-card p{color:var(--muted);min-height:42px}.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.subject-btn{border:1px solid rgba(248,184,16,.7);background:#fff;color:var(--green);border-radius:12px;padding:14px;box-shadow:inset 0 -3px 0 var(--yellow);cursor:pointer}.subject-btn strong,.subject-btn span{display:block}.subject-btn span{color:var(--muted);font-size:11px;margin-top:3px}.chat-card{overflow:hidden}.chat-header{background:var(--green);color:#fff;padding:15px 17px;display:flex;justify-content:space-between;align-items:center}.chat-header small,.chat-header strong{display:block}.chat-list{padding:16px;min-height:260px;background:#f8faf9}.message{background:#fff;border:1px solid var(--line);border-radius:13px;padding:12px;margin-bottom:10px}.teacher-message{border-right:4px solid var(--yellow);background:#fffdf7}.message-meta{display:flex;gap:8px;color:var(--muted);font-size:11px}.file-chip{margin-top:8px;color:var(--green);font-size:12px}.composer{padding:14px;border-top:1px solid var(--line)}.composer textarea{width:100%;min-height:90px;border:1px solid #d3dfdb;border-radius:11px;padding:11px;resize:vertical}.composer-row{display:flex;align-items:center;gap:8px;margin-top:9px}.send-btn{margin-right:auto}.file-name{color:var(--muted);font-size:12px}.empty-state{text-align:center;color:var(--muted);padding:42px 10px}.admin-shell{min-height:100vh}.admin-sidebar{position:fixed;right:0;top:0;bottom:0;width:240px;background:var(--green);color:#fff}.admin-brand{padding:18px;display:flex;gap:10px;align-items:center;border-bottom:1px solid rgba(255,255,255,.1)}.admin-brand img{height:42px;background:#fff;border-radius:10px;padding:3px}.admin-brand strong,.admin-brand small{display:block}.admin-brand small{color:#d6e7e1;margin-top:2px}.admin-sidebar nav{padding:12px 9px;display:grid;gap:6px}.admin-sidebar nav button{border:0;background:transparent;color:#e5efeb;text-align:right;padding:11px 12px;border-radius:10px;cursor:pointer}.admin-sidebar nav button.active{background:var(--yellow);color:var(--green);font-weight:800}.admin-main{margin-right:240px;min-height:100vh}.admin-topbar{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:5}.admin-topbar>div{display:flex;align-items:center;gap:10px;color:var(--muted)}.admin-content{padding:22px;max-width:1400px;margin:auto}.dashboard-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-bottom:18px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:17px}.stat-card span{color:var(--muted);font-size:13px}.stat-card strong{display:block;color:var(--green);font-size:28px;margin-top:7px}.stat-card i{display:block;width:32px;height:4px;border-radius:99px;background:var(--yellow);margin-top:8px}.admin-panel-card{padding:17px}.panel-title-row{display:flex;justify-content:space-between;align-items:center;gap:12px}.panel-title-row h3{margin:0}.activity-list li{padding:10px 0;border-bottom:1px solid var(--line)}.table-scroll{overflow:auto;margin-top:14px}table{width:100%;border-collapse:collapse;min-width:760px}th,td{text-align:right;padding:12px;border-bottom:1px solid var(--line);font-size:13px}th{background:#f9fbfa;color:#5d6c67}@media(max-width:900px){.subject-grid,.dashboard-cards{grid-template-columns:repeat(2,1fr)}}@media(max-width:720px){.class-grid{grid-template-columns:1fr}.site-header{align-items:flex-start}.header-user{font-size:12px}.admin-sidebar{position:static;width:100%}.admin-sidebar nav{grid-template-columns:repeat(2,1fr)}.admin-main{margin-right:0}.admin-topbar{position:static}}@media(max-width:480px){.subject-grid,.dashboard-cards{grid-template-columns:1fr}.composer-row{flex-wrap:wrap}.send-btn{margin-right:0;width:100%}}