*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Inter',sans-serif;
}

body{
    background:linear-gradient(135deg, #f8fafc 0%, #f1f5ff 100%);
    min-height:100vh;
}

/* NAVBAR */

.navbar{
    height:70px;
    background:white;
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 40px;
    border-bottom:1px solid #e8ecf1;
    box-shadow:0 2px 8px rgba(15,23,42,0.05);
}

.logo{
    display:flex;
    align-items:center;
    gap:14px;
}

.logo h2{
    color:#0f172a;
    font-size:20px;
    font-weight:800;
    letter-spacing:-0.5px;
}

.logo-box{
    width:42px;
    height:42px;
    background:linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color:white;
    border-radius:12px;
    display:flex;
    align-items:center;
    justify-content:center;
    font-weight:800;
    box-shadow:0 4px 15px rgba(99,102,241,0.35);
    letter-spacing:-0.5px;
}

.theme-btn{
    border:2px solid #e2e8f0;
    background:white;
    padding:10px 14px;
    border-radius:12px;
    cursor:pointer;
    font-size:18px;
    transition:all 0.3s ease;
    display:flex;
    align-items:center;
    justify-content:center;
}

.theme-btn:hover{
    background:#f1f5f9;
    border-color:#6366f1;
    box-shadow:0 4px 12px rgba(99,102,241,0.2);
}

/* LAYOUT */

.container{
    display:flex;
}

/* SIDEBAR */

.sidebar{
    width:230px;
    min-height:calc(100vh - 70px);
    background:white;
    border-right:1px solid #e8ecf1;
    padding:24px 16px;
    box-shadow:0 2px 8px rgba(15,23,42,0.03);
    overflow-y:auto;
}

.sidebar button{
    width:100%;
    border:none;
    background:transparent;
    padding:14px 16px;
    text-align:left;
    border-radius:12px;
    cursor:pointer;
    font-size:15px;
    font-weight:700;
    color:#475569;
    transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom:10px;
    letter-spacing:0.2px;
}

.sidebar button:hover{
    background:linear-gradient(135deg, #eef2ff 0%, #dbeafe 100%);
    color:#6366f1;
    transform:translateX(6px);
    box-shadow:0 4px 12px rgba(99,102,241,0.15);
}

/* MAIN */

main{
    flex:1;
    padding:48px 40px;
    overflow-y:auto;
    max-height:calc(100vh - 70px);
}

main h1{
    color:#0f172a;
    font-size:34px;
    font-weight:800;
    margin-bottom:40px;
    letter-spacing:-0.5px;
}

/* GRID */

.grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
    gap:32px;
    margin-bottom:32px;
}

/* CARDS */

.card{
    background:white;
    padding:32px;
    border-radius:16px;
    border:1px solid #e8ecf1;
    box-shadow:0 2px 8px rgba(15,23,42,0.04), 0 1px 3px rgba(15,23,42,0.08);
    transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display:flex;
    flex-direction:column;
    min-height:fit-content;
    margin-top: 15px;
}

.card:hover{
    box-shadow:0 12px 32px rgba(15,23,42,0.12), 0 6px 16px rgba(15,23,42,0.08);
    transform:translateY(-4px);
    border-color:#dde5f0;
}

.card h1{
    font-size:36px;
    font-weight:800;
    color:#0f172a;
    margin:0 0 8px 0;
    letter-spacing:-0.5px;
}

.card h2{
    font-size:22px;
    font-weight:700;
    color:#1e293b;
    margin:0 0 20px 0;
    letter-spacing:-0.3px;
}

.card h3{
    color:#475569;
    font-weight:700;
    margin:0 0 16px 0;
    font-size:15px;
    letter-spacing:0.3px;
    text-transform:uppercase;
}

.card p{
    color:#64748b;
    line-height:1.7;
    margin:8px 0;
    font-weight:500;
}

.card input,
.card select,
.card textarea{
    width:100%;
    padding:14px 16px;
    margin:12px 0;
    border:2px solid #e2e8f0;
    border-radius:12px;
    font-size:15px;
    font-family:'Inter',sans-serif;
    font-weight:500;
    transition:all 0.3s ease;
    background:white;
    color:#1e293b;
}

.card input:hover,
.card select:hover,
.card textarea:hover{
    border-color:#cbd5e1;
}

.card input:focus,
.card select:focus,
.card textarea:focus{
    outline:none;
    border-color:#6366f1;
    box-shadow:inset 0 0 0 3px rgba(99,102,241,0.05), 0 0 0 3px rgba(99,102,241,0.15);
    background:white;
}

.card input::placeholder{
    color:#94a3b8;
    font-weight:500;
}

.card input[type="date"],
.card input[type="time"]{
    cursor:pointer;
}

.card input[type="number"]{
    padding:14px 16px;
}

/* BIG CARDS */

.big-card{
    margin-top:32px;
}

/* BUTTONS */

button{
    border:none;
    border-radius:12px;
    cursor:pointer;
    transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight:700;
    font-size:15px;
    font-family:'Inter',sans-serif;
}

.card button.primary{
    width:100%;
    padding:16px 20px;
    margin:16px 0 0 0;
    background:linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color:white;
    box-shadow:0 4px 15px rgba(99,102,241,0.35);
    letter-spacing:0.5px;
}

.card button.primary:hover{
    background:linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    box-shadow:0 8px 24px rgba(99,102,241,0.45);
    transform:translateY(-2px);
}

.card button.primary:active{
    transform:translateY(0);
    box-shadow:0 2px 8px rgba(99,102,241,0.35);
}

.card button[onclick^="toggleTask"],
.card button[onclick^="editSubject"],
.card button[onclick^="deleteSubject"],
.card button[onclick^="deleteTask"],
.card button[onclick^="deleteSlot"]{
    padding:10px 12px;
    background:#f1f5f9;
    color:#475569;
    margin:0 4px;
    font-size:16px;
    min-width:44px;
    border:2px solid #e2e8f0;
    font-weight:700;
    transition:all 0.2s ease;
}

.card button[onclick^="toggleTask"]:hover,
.card button[onclick^="editSubject"]:hover{
    background:#dbeafe;
    color:#0369a1;
    border-color:#0369a1;
}

button[onclick*="delete"]:hover,
button[onclick*="deleteSlot"]:hover,
button[onclick*="deleteTask"]:hover,
button[onclick*="deleteSubject"]:hover{
    background:#fee2e2;
    color:#dc2626;
    border-color:#dc2626;
}

/* DARK MODE */

.dark{
    background:linear-gradient(135deg, #0f172a 0%, #1a1f35 100%);
    color:white;
}

.dark .navbar,
.dark .sidebar,
.dark .card{
    background:#1e293b;
    color:white;
    border-color:#334155;
}

.dark .card input,
.dark .card select,
.dark .card textarea{
    background:#0f172a;
    color:white;
    border-color:#334155;
}

.dark .card input:hover,
.dark .card select:hover,
.dark .card textarea:hover{
    border-color:#475569;
}

.dark .card input:focus,
.dark .card select:focus,
.dark .card textarea:focus{
    border-color:#818cf8;
    box-shadow:inset 0 0 0 3px rgba(129,140,248,0.1), 0 0 0 3px rgba(129,140,248,0.2);
}

.dark .card input::placeholder{
    color:#64748b;
}

.dark .sidebar button{
    color:#cbd5e1;
}

.dark .sidebar button:hover{
    background:rgba(99,102,241,0.15);
    color:#a5b4fc;
    box-shadow:0 4px 12px rgba(99,102,241,0.2);
}

.dark main h1{
    color:#f1f5f9;
}

.dark .card h1,
.dark .card h2,
.dark .card h3{
    color:#f1f5f9;
}

.dark .card p{
    color:#cbd5e1;
}

.dark .logo h2{
    color:#f1f5f9;
}

/* LIST ITEMS */

.list{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:18px;
    border:2px solid #e2e8f0;
    border-radius:12px;
    margin:14px 0;
    transition:all 0.3s ease;
    background:white;
    min-height:70px;
}

.dark .list{
    border-color:#334155;
    background:#0f172a;
}

.list:hover{
    background:#f8fafc;
    border-color:#cbd5e1;
    box-shadow:0 4px 12px rgba(15,23,42,0.06);
}

.dark .list:hover{
    background:#1e293b;
    border-color:#475569;
}

.list div:first-child{
    flex:1;
}

.list div:first-child strong{
    color:#0f172a;
    display:block;
    margin-bottom:6px;
    font-weight:700;
    font-size:15px;
    letter-spacing:-0.3px;
}

.dark .list div:first-child strong{
    color:#f1f5f9;
}

.list div:first-child small{
    color:#64748b;
    font-size:13px;
    font-weight:600;
}

.dark .list div:first-child small{
    color:#cbd5e1;
}

.list div:last-child{
    display:flex;
    gap:8px;
}

/* PRIORITY BADGE */

.priority{
    display:inline-block;
    padding:6px 12px;
    border-radius:10px;
    font-size:12px;
    font-weight:700;
    margin-top:8px;
    letter-spacing:0.3px;
}

.priority.high{
    background:#fef2f2;
    color:#dc2626;
}

.priority.medium{
    background:#fffbeb;
    color:#d97706;
}

.priority.low{
    background:#f0fdf4;
    color:#059669;
}

/* PROGRESS BAR */

.progress{
    background:#e2e8f0;
    border-radius:12px;
    height:28px;
    margin:16px 0;
    overflow:hidden;
    box-shadow:inset 0 2px 4px rgba(15,23,42,0.05);
}

.dark .progress{
    background:#334155;
}

.progress .bar{
    background:linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
    height:100%;
    border-radius:12px;
    display:flex;
    align-items:center;
    justify-content:center;
    color:white;
    font-weight:700;
    font-size:13px;
    transition:width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow:0 4px 12px rgba(99,102,241,0.3);
    letter-spacing:0.5px;
}

/* TABLE */

table{
    width:100%;
    border-collapse:collapse;
    margin-top:10px;
}

table tr{
    border-bottom:2px solid #e2e8f0;
}

.dark table tr{
    border-bottom-color:#334155;
}

table th{
    background:linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color:white;
    padding:16px 14px;
    text-align:left;
    font-weight:700;
    letter-spacing:0.5px;
}

table td{
    padding:16px 14px;
    color:#475569;
    font-weight:600;
}

.dark table td{
    color:#cbd5e1;
}

table tr:hover{
    background:#f8fafc;
}

.dark table tr:hover{
    background:#334155;
}

/* LABEL */

label{
    display:block;
    color:#1e293b;
    font-weight:700;
    margin:20px 0 10px 0;
    font-size:14px;
    letter-spacing:0.3px;
}

.dark label{
    color:#e0e7ff;
}

/* FILE INPUT */

input[type="file"]{
    padding:10px;
    cursor:pointer;
}

/* CHARTS */

canvas{
    max-width:100%;
}

.dark canvas{
    filter:invert(0.93);
}