:root {
    --primary: #4457E5;
    --primary-dark: #2F3EBF;
    --primary-light: #EEF0FE;
    --accent: #FF7A4D;
    --accent-dark: #E85F32;
    --teal: #14B8A6;
    --bg: #F4F6FB;
    --surface: #FFFFFF;
    --border: #E4E8F1;
    --text: #232742;
    --text-muted: #6B7290;
    --danger: #E5484D;
    --danger-bg: #FDEAEA;
    --success: #1FAA59;
    --success-bg: #E7F8ED;
    --warn: #D9822B;
    --warn-bg: #FEF3E2;
    --shadow-sm: 0 1px 2px rgba(35, 39, 66, 0.06), 0 1px 3px rgba(35, 39, 66, 0.06);
    --shadow-md: 0 4px 14px rgba(35, 39, 66, 0.08);
    --radius: 12px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Poppins', -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-weight: 600; letter-spacing: -0.01em; }

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

/* Topbar */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(120deg, #3A46D6 0%, #4457E5 45%, #6C4FE0 100%);
    color: #fff;
    padding: 0.85rem 1.75rem;
    flex-wrap: wrap;
    gap: 0.6rem;
    box-shadow: 0 2px 12px rgba(58, 70, 214, 0.25);
}
.topbar .brand {
    display: flex;
    align-items: center;
    background: #fff;
    padding: 0.3rem 0.7rem;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.topbar .brand img { height: 34px; display: block; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 0.15rem; }
.topbar nav a, .topbar .user-box a {
    color: rgba(255,255,255,0.88);
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.15s ease, color 0.15s ease;
}
.topbar nav a:hover, .topbar .user-box a:hover {
    background: rgba(255,255,255,0.16);
    color: #fff;
    text-decoration: none;
}
.topbar nav a.active {
    background: rgba(255,255,255,0.22);
    color: #fff;
}
.topbar .user-box { display: flex; align-items: center; gap: 0.6rem; font-size: 0.88rem; color: rgba(255,255,255,0.85); }
.topbar .user-box span { padding: 0.3rem 0.6rem; }

.container {
    max-width: 1150px;
    margin: 1.75rem auto;
    padding: 0 1.25rem;
}

/* Alerts */
.alert {
    padding: 0.8rem 1.1rem;
    border-radius: 10px;
    margin-bottom: 1.2rem;
    font-size: 0.92rem;
    border: 1px solid transparent;
}
.alert-success { background: var(--success-bg); color: #16803D; border-color: #BEEBCE; }
.alert-error { background: var(--danger-bg); color: #C4232A; border-color: #F5C2C4; }

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    margin-bottom: 1.4rem;
    box-shadow: var(--shadow-sm);
}
.card h3 { margin-top: 0; color: var(--text); }

/* Stat tiles */
.grid-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.1rem;
    margin-bottom: 1.75rem;
}
.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.15rem 1.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 0.9rem;
    border-left: 4px solid var(--primary);
}
.stat.stat-warn { border-left-color: var(--warn); }
.stat.stat-danger { border-left-color: var(--danger); }
.stat.stat-teal { border-left-color: var(--teal); }
.stat .icon {
    width: 42px; height: 42px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 10px;
    font-size: 1.3rem;
    background: var(--primary-light);
    flex-shrink: 0;
}
.stat.stat-warn .icon { background: var(--warn-bg); }
.stat.stat-danger .icon { background: var(--danger-bg); }
.stat.stat-teal .icon { background: #E3FBF8; }
.stat .num { font-size: 1.7rem; font-weight: 700; color: var(--text); line-height: 1.1; }
.stat .label { color: var(--text-muted); font-size: 0.82rem; margin-top: 0.15rem; }

/* Tables */
table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; }
th, td { padding: 0.65rem 0.8rem; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.9rem; }
th { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
tbody tr:hover td { background: #FAFBFF; }
tbody tr:nth-child(even) td { background: #FCFCFE; }
tbody tr:nth-child(even):hover td { background: #FAFBFF; }

.card > table, .card table { box-shadow: none; }

form.inline { display: inline; }
.form-row { margin-bottom: 1rem; }
label { display: block; font-weight: 600; margin-bottom: 0.35rem; font-size: 0.87rem; color: var(--text); }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], select, textarea {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 0.94rem;
    font-family: inherit;
    background: var(--surface);
    color: var(--text);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(68, 87, 229, 0.15);
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 9px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    box-shadow: 0 2px 6px rgba(68, 87, 229, 0.28);
    transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; transform: translateY(-1px); box-shadow: 0 4px 10px rgba(68, 87, 229, 0.35); }
.btn:active { transform: translateY(0); }
.btn-danger { background: var(--danger); box-shadow: 0 2px 6px rgba(229, 72, 77, 0.28); }
.btn-danger:hover { background: #C4232A; box-shadow: 0 4px 10px rgba(229, 72, 77, 0.35); }
.btn-secondary { background: #8A90AD; box-shadow: 0 2px 6px rgba(138, 144, 173, 0.28); }
.btn-secondary:hover { background: #6F7593; box-shadow: 0 4px 10px rgba(111, 117, 147, 0.35); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; border-radius: 7px; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

.badge { display: inline-block; padding: 0.22rem 0.65rem; border-radius: 999px; font-size: 0.76rem; font-weight: 600; }
.badge-open { background: var(--warn-bg); color: #A6620E; }
.badge-closed { background: var(--success-bg); color: #16803D; }

/* Login */
.login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #3A46D6 0%, #6C4FE0 55%, #FF7A4D 130%);
    padding: 1.5rem;
}
.login-box {
    background: var(--surface);
    border-radius: 16px;
    padding: 2.25rem 2rem;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 50px rgba(30, 20, 90, 0.35);
}
.login-logo {
    display: block;
    max-width: 240px;
    width: 100%;
    height: auto;
    margin: 0 auto 1.5rem;
}
.login-box h1 { font-size: 1.35rem; margin: 0 0 1.4rem; text-align: center; color: var(--text); }

.toolbar { display: flex; gap: 0.6rem; align-items: center; margin-bottom: 1.1rem; flex-wrap: wrap; }
.diff-pos { color: var(--success); font-weight: 700; }
.diff-neg { color: var(--danger); font-weight: 700; }
.muted { color: var(--text-muted); font-size: 0.85rem; }