:root{--bg:#f4f6ff;--card:#fff;--ink:#17203a;--muted:#7c86a5;--primary:#5865f2;--primary2:#746df7;--line:#e7eaf6;--green:#14b87a;--red:#e75767;--yellow:#e9a520;--shadow:0 12px 30px rgba(72,82,160,.08)}
*{box-sizing:border-box}html,body{margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}a{color:#4458de;text-decoration:none}button,input,select,textarea{font:inherit}
.app-shell{display:grid;grid-template-columns:230px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:#fff;border-right:1px solid var(--line);padding:24px 16px;display:flex;flex-direction:column;gap:24px}.logo{display:flex;align-items:center;gap:10px;font-size:20px;padding:0 8px}.logo span,.brand-mark{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--primary),#3cb7ff);box-shadow:0 8px 20px rgba(88,101,242,.24)}.sidebar nav{display:grid;gap:8px}.sidebar nav a,.logout{padding:12px;border-radius:12px;color:#687390;display:flex;gap:10px;align-items:center}.sidebar nav a:hover{background:#f0f2ff;color:var(--primary)}.logout{margin-top:auto}.main{padding:0 28px 90px;max-width:1400px;width:100%;margin:auto}.topbar{height:82px;display:flex;align-items:center;gap:15px}.topbar h2{margin:0;font-size:20px}.menu-btn{display:none;border:0;background:#fff;border-radius:10px;padding:10px}.hero{background:linear-gradient(135deg,#5063ef,#7c73f5);border-radius:22px;padding:30px;color:white;display:flex;justify-content:space-between;align-items:center;box-shadow:var(--shadow)}.hero h1{margin:7px 0 8px;font-size:32px;max-width:700px}.hero p{margin:0;opacity:.86}.eyebrow{font-size:13px;opacity:.9}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:18px 0}.stat-card,.card,.day-card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.stat-card{padding:20px}.stat-label{color:var(--muted);font-size:13px}.stat-value{font-weight:800;font-size:27px;margin-top:8px}.grid-2{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}.card{padding:18px}.card-head,.page-actions{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:14px}.card-head h3{margin:0}.muted{color:var(--muted)}.small{font-size:12px}.lesson-row,.payment-row{display:flex;align-items:center;gap:12px;padding:13px 0;border-top:1px solid var(--line)}.lesson-row:first-of-type,.payment-row:first-of-type{border-top:0}.grow{flex:1}.time-pill{background:#eef0ff;color:#4458de;border-radius:10px;padding:8px 10px;font-weight:700;min-width:58px;text-align:center}.badge{font-size:12px;padding:6px 9px;border-radius:999px;font-weight:700}.badge.green,.status-btn.green{background:#e4f8f0;color:#087c55}.badge.red,.status-btn.red{background:#fdebed;color:#b42e3d}.badge.yellow,.status-btn.yellow{background:#fff5dc;color:#9f6c00}.badge.gray,.status-btn.gray{background:#eff1f6;color:#626b81}.badge.blue,.status-btn.blue{background:#edf0ff;color:#4a58d8}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 14px;border-radius:11px;cursor:pointer;font-weight:700}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.success{background:var(--green);border-color:var(--green);color:#fff}.btn.light{background:rgba(255,255,255,.18);color:#fff;border-color:rgba(255,255,255,.28)}.btn.tiny{font-size:12px;padding:7px 9px}.btn.full{width:100%}.empty{padding:28px 10px;text-align:center;color:var(--muted)}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;min-width:680px}th,td{text-align:left;padding:13px;border-bottom:1px solid var(--line);font-size:14px}th{color:var(--muted);font-size:12px}.form-card{max-width:850px}.form-grid{display:grid;gap:15px}.form-grid.two{grid-template-columns:1fr 1fr}.form-grid label{display:grid;gap:7px;font-size:13px;font-weight:700}.form-grid input,.form-grid select,.form-grid textarea,.inline-form input{width:100%;border:1px solid #dfe3f2;border-radius:11px;padding:11px 12px;background:#fff;outline:none}.form-grid input:focus,.form-grid select:focus,.form-grid textarea:focus{border-color:#8e97f7;box-shadow:0 0 0 3px #eef0ff}.full-span{grid-column:1/-1}.checkbox{display:flex!important;grid-template-columns:auto 1fr!important;align-items:center}.checkbox input{width:auto!important}.actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.status-actions{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:20px}.status-btn{border:0;border-radius:14px;padding:18px;font-weight:800;cursor:pointer}.calendar-list{display:grid;gap:14px}.day-card{padding:18px}.day-title{display:flex;justify-content:space-between;padding-bottom:8px}.inline-form{display:flex;align-items:end;gap:8px}.inline-form label{font-size:12px;color:var(--muted)}.big-money{font-size:24px}.alert{padding:13px 15px;border-radius:12px;margin-bottom:16px}.alert.success{background:#e8f8f2;color:#087c55}.alert.danger{background:#fdebed;color:#a52a39}.auth-bg{min-height:100vh;background:radial-gradient(circle at top left,#e7eaff,transparent 42%),#f7f8fe;display:grid;place-items:center;padding:22px}.auth-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow)}.setup-card{width:min(620px,100%)}.auth-card h1{margin-bottom:6px}.brand-mark{font-size:22px}.mobile-nav{display:none}
@media(max-width:900px){.app-shell{grid-template-columns:1fr}.sidebar{display:none}.main{padding:0 14px 90px}.topbar{height:70px}.menu-btn{display:block}.grid-2{grid-template-columns:1fr}.hero{padding:24px}.hero h1{font-size:26px}.hero .btn{display:none}.stats-grid{grid-template-columns:1fr 1fr}.stat-card:last-child{grid-column:1/-1}.mobile-nav{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);z-index:20;padding-bottom:max(6px,env(safe-area-inset-bottom))}.mobile-nav a{display:grid;place-items:center;gap:2px;padding:9px 4px;color:#687390;font-size:18px}.mobile-nav span{font-size:10px}.page-actions{align-items:flex-start;flex-direction:column}.inline-form{width:100%;display:grid;grid-template-columns:1fr 1fr}.inline-form .btn{grid-column:1/-1}.lesson-row{flex-wrap:wrap}.lesson-row .grow{min-width:45%}.form-grid.two{grid-template-columns:1fr}.full-span{grid-column:auto}.status-actions{grid-template-columns:1fr}.actions{justify-content:flex-start}}
@media(max-width:520px){.stats-grid{grid-template-columns:1fr}.stat-card:last-child{grid-column:auto}.hero h1{font-size:23px}.card,.day-card{border-radius:15px}.time-pill{min-width:52px}.lesson-row .btn.tiny{width:100%}}

.stats-grid.four{grid-template-columns:repeat(4,1fr)}
.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:18px}
.quick-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow);color:var(--ink);display:grid;gap:6px}
.quick-card>span{width:38px;height:38px;border-radius:12px;background:#eef0ff;color:var(--primary);display:grid;place-items:center;font-size:20px}
.quick-card small{color:var(--muted)}
.date-box{width:46px;height:48px;border-radius:12px;background:#f2f4ff;display:grid;place-items:center;color:#4458de;line-height:1}
.date-box strong{font-size:18px}.date-box span{font-size:10px}
@media(max-width:900px){.stats-grid.four{grid-template-columns:1fr 1fr}.quick-grid{grid-template-columns:1fr}}
@media(max-width:520px){.stats-grid.four{grid-template-columns:1fr 1fr}.stat-value{font-size:22px}}

/* ===== V3 ===== */
.hero.v3{background:linear-gradient(135deg,#4f67f2,#786ff4)}
.stat-icon{width:36px;height:36px;border-radius:11px;background:#eef0ff;color:var(--primary);display:grid;place-items:center;font-weight:800;margin-bottom:12px}
.calendar-toolbar{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:16px}
.calendar-nav{display:flex;align-items:center;gap:12px}.calendar-nav h2{margin:0}.icon-btn{width:42px;height:42px;padding:0;font-size:24px}
.calendar-card{background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}
.calendar-weekdays{display:grid;grid-template-columns:repeat(7,1fr);background:#f7f8fd;border-bottom:1px solid var(--line)}
.calendar-weekdays div{padding:12px;text-align:center;color:var(--muted);font-size:12px;font-weight:800}
.month-grid{display:grid;grid-template-columns:repeat(7,1fr)}
.calendar-day{min-height:145px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:9px;position:relative;background:#fff}
.calendar-day:nth-child(7n){border-right:0}.calendar-day.other-month{background:#fafbfe}.calendar-day.other-month .day-number{opacity:.38}
.calendar-day.today{box-shadow:inset 0 0 0 2px rgba(88,101,242,.18)}
.day-number{display:flex;align-items:center;justify-content:space-between;margin-bottom:7px}.day-number>span{width:27px;height:27px;display:grid;place-items:center;border-radius:9px;font-weight:800;font-size:13px}
.calendar-day.today .day-number>span{background:var(--primary);color:#fff}.day-number em{font-size:9px;color:var(--primary);font-style:normal}
.day-events{display:grid;gap:4px}.calendar-event{display:flex;gap:5px;align-items:center;padding:5px 6px;border-radius:7px;font-size:10px;overflow:hidden}
.calendar-event span{opacity:.75;flex:none}.calendar-event strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.event-blue{background:#eef0ff;color:#3f51cf}.event-green{background:#e4f8f0;color:#087c55}.event-red{background:#fdebed;color:#b42e3d}.event-yellow{background:#fff5dc;color:#9f6c00}.event-gray{background:#eff1f6;color:#626b81}
.day-add{position:absolute;right:7px;bottom:5px;width:25px;height:25px;display:grid;place-items:center;border-radius:8px;color:#a3abc1;opacity:0}.calendar-day:hover .day-add{opacity:1;background:#f1f3ff;color:var(--primary)}
.more-events{border:0;background:transparent;color:var(--primary);font-size:10px;cursor:pointer;padding:2px 4px;text-align:left}
.mobile-day-list{display:none}
.modal-backdrop{position:fixed;inset:0;background:rgba(20,28,60,.35);display:none;place-items:center;z-index:100;padding:20px}.modal-backdrop.show{display:grid}.modal-card{background:#fff;width:min(480px,100%);max-height:80vh;overflow:auto;border-radius:20px;padding:20px;position:relative;box-shadow:0 24px 70px rgba(23,32,58,.25)}.modal-close{position:absolute;right:14px;top:12px;border:0;background:#f1f3f8;width:32px;height:32px;border-radius:10px;font-size:20px}.modal-lesson{display:flex;align-items:center;gap:12px;color:var(--ink);padding:12px 0;border-top:1px solid var(--line)}
.lesson-detail-card{max-width:760px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow)}.lesson-detail-top{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.lesson-detail-top h2{margin:4px 0}
.package-mini,.package-card{background:#f8f9ff;border:1px solid #e9ebfa;border-radius:16px;padding:16px;margin:18px 0}.progress{height:7px;border-radius:99px;background:#e8ebf6;overflow:hidden;margin-top:10px}.progress span{display:block;height:100%;background:linear-gradient(90deg,#5367f3,#786ff4);border-radius:99px}.progress.large{height:11px}
.status-actions.big .status-btn{display:grid;gap:4px;text-align:left}.status-actions.big .status-btn b{font-size:24px}.status-actions.big .status-btn span{font-size:16px}.status-actions.big .status-btn small{opacity:.68}.top-gap{margin-top:18px}
.student-hero{display:flex;align-items:center;gap:16px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:var(--shadow)}.student-hero h1{margin:2px 0 4px}.student-avatar{width:62px;height:62px;border-radius:18px;background:linear-gradient(135deg,#5266f3,#61b6ff);display:grid;place-items:center;color:#fff;font-weight:900;font-size:24px;flex:none}.small-avatar{width:44px;height:44px;border-radius:14px;font-size:18px}
.package-card-head{display:flex;justify-content:space-between;align-items:center}.package-card-head h3{margin:3px 0}.package-number{font-weight:900;color:var(--primary)}.package-warning{margin-top:12px;color:#9f6c00;font-size:13px}
.student-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.student-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:17px;box-shadow:var(--shadow);color:var(--ink)}.student-card-top{display:flex;align-items:center;gap:12px}.student-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:16px}.student-metrics div{background:#f7f8fd;border-radius:12px;padding:10px}.student-metrics small{display:block;color:var(--muted);font-size:10px;margin-bottom:4px}.student-metrics b{font-size:12px}.renew-box{padding:14px;background:#f7f8ff;border:1px solid #e7eafd;border-radius:14px}.package-count{font-weight:900;color:var(--primary)}.danger-count{color:#c93648}
@media(max-width:1100px){.student-grid{grid-template-columns:1fr 1fr}.calendar-day{min-height:120px}.calendar-event{font-size:9px}}
@media(max-width:760px){.calendar-card{display:none}.mobile-day-list{display:grid;gap:12px}.calendar-toolbar{align-items:flex-start}.calendar-toolbar .actions{justify-content:flex-end}.student-grid{grid-template-columns:1fr}.student-hero{align-items:flex-start;flex-wrap:wrap}.student-hero .actions{width:100%}.lesson-detail-card{padding:17px}}

/* ===== V4 ===== */
.today-header{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:16px}.today-header h2{margin:4px 0}
.today-list{display:grid;gap:14px}.today-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;display:grid;grid-template-columns:90px 1fr auto;gap:14px;align-items:center;box-shadow:var(--shadow)}
.today-time{font-size:28px;font-weight:900;color:var(--primary)}.today-card h3{margin:0 0 5px}.today-actions{grid-column:1/-1;display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.sidebar>a:not(.logout){padding:12px;border-radius:12px;color:#687390;display:flex;gap:10px;align-items:center}.sidebar>a:not(.logout):hover{background:#f0f2ff;color:var(--primary)}
.mobile-nav{grid-template-columns:repeat(5,1fr)!important}
@media(max-width:760px){.today-card{grid-template-columns:72px 1fr}.today-card>div:nth-child(3){grid-column:2}.today-time{font-size:23px}.today-actions{justify-content:stretch}.today-actions .btn{flex:1}}