:root {
    color-scheme: light;
    --metal-950: #202428;
    --metal-900: #2b3035;
    --metal-800: #3e454c;
    --metal-700: #59626a;
    --metal-600: #717b84;
    --metal-500: #8d969e;
    --metal-400: #afb6bc;
    --metal-300: #cbd0d4;
    --metal-200: #e0e3e6;
    --metal-100: #f0f2f3;
    --metal-50: #f8f9fa;
    --page: #f4f5f6;
    --shadow: 0 12px 32px rgb(37 42 46 / 6%);
    font-family: Inter, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    color: var(--metal-950);
    background: var(--page);
    font-family: Inter, "Segoe UI", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--metal-800); }
a:hover { color: var(--metal-950); }

.app-container { width: min(1200px, calc(100% - 40px)); margin-inline: auto; }

.app-navbar {
    min-height: 76px;
    background: linear-gradient(180deg, #fff 0%, #f5f6f7 100%);
    border-bottom: 1px solid var(--metal-200);
    box-shadow: 0 2px 12px rgb(36 41 45 / 4%);
}

.app-brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    margin-right: 2rem;
    color: var(--metal-950);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -.035em;
}

.app-brand:hover { color: var(--metal-950); }
.app-brand img { display: block; width: 132px; height: auto; }
.navbar-nav { gap: .15rem; }
.navbar-nav .nav-link { padding: .65rem .8rem; color: var(--metal-700); font-size: .9rem; font-weight: 500; }
.navbar-nav .nav-link i { margin-right: .25rem; color: var(--metal-600); }
.navbar-nav .nav-link:hover, .navbar-nav .nav-link:focus { color: var(--metal-950); }
.navbar-toggler { border-color: var(--metal-300); color: var(--metal-800); }
.navbar-toggler:focus { box-shadow: 0 0 0 .2rem rgb(89 98 106 / 18%); }

.app-main { flex: 1; padding-block: 2.25rem 3rem; }
.page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1.5rem; }
.page-heading h1 { margin: 0; color: var(--metal-950); font-size: clamp(1.65rem, 3vw, 2rem); font-weight: 700; letter-spacing: -.045em; }
.page-heading p { max-width: 720px; margin: .45rem 0 0; color: var(--metal-600); }
.eyebrow { margin-bottom: .45rem; color: var(--metal-600); font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }

.app-card {
    margin-bottom: 1.25rem;
    padding: clamp(1.15rem, 2.5vw, 1.65rem);
    border: 1px solid var(--metal-200);
    border-radius: 1rem;
    background: #fff;
    box-shadow: var(--shadow);
}

.app-card h2 { margin: 0 0 1rem; color: var(--metal-900); font-size: 1.12rem; font-weight: 650; letter-spacing: -.02em; }
.app-card p:last-child { margin-bottom: 0; }
.auth-card { max-width: 490px; margin: clamp(1rem, 5vh, 3.5rem) auto; }
.auth-card .app-brand-mini { margin-bottom: 1.5rem; }
.auth-card .app-brand-mini img { width: 144px; }
.auth-card h1 { margin-bottom: .45rem; font-size: 1.7rem; font-weight: 700; letter-spacing: -.04em; }
.auth-intro, .form-text, .text-secondary { color: var(--metal-600) !important; }
.form-label { margin-bottom: .4rem; color: var(--metal-800); font-size: .88rem; font-weight: 600; }
.form-control, .form-select {
    min-height: 44px;
    border-color: var(--metal-300);
    border-radius: .65rem;
    color: var(--metal-950);
    box-shadow: none;
}
.form-control:focus, .form-select:focus {
    border-color: var(--metal-600);
    box-shadow: 0 0 0 .22rem rgb(89 98 106 / 15%);
}
textarea.form-control { min-height: 220px; font-family: "SFMono-Regular", Consolas, monospace; font-size: .86rem; }
.app-form { display: flex; flex-direction: column; gap: 1rem; }

.btn { border-radius: .6rem; font-weight: 600; transition: background-color .15s ease, box-shadow .15s ease, transform .15s ease; }
.btn:active { transform: translateY(1px); }
.btn-steel {
    border: 1px solid var(--metal-900);
    background: linear-gradient(180deg, #454b51, #292e33);
    color: #fff;
}
.btn-steel:hover, .btn-steel:focus { border-color: var(--metal-950); background: var(--metal-950); color: #fff; }
.btn-outline-steel { border: 1px solid var(--metal-300); background: #fff; color: var(--metal-800); }
.btn-outline-steel:hover, .btn-outline-steel:focus { border-color: var(--metal-600); background: var(--metal-100); color: var(--metal-950); }
.btn-danger-soft { border: 1px solid #d9c9c9; background: #fff; color: #754d4d; }
.btn-danger-soft:hover, .btn-danger-soft:focus { border-color: #bda3a3; background: #f6eeee; color: #623b3b; }
.btn-icon { display: inline-flex; align-items: center; gap: .4rem; }

.metric-card {
    height: 100%;
    padding: 1.25rem;
    border: 1px solid var(--metal-200);
    border-radius: .9rem;
    background: linear-gradient(145deg, #fff, var(--metal-100));
}
.metric-label { color: var(--metal-600); font-size: .82rem; font-weight: 600; }
.metric-value { margin-top: .35rem; color: var(--metal-950); font-size: 1.8rem; font-weight: 700; letter-spacing: -.05em; }
.metric-icon {
    display: grid;
    width: 2.5rem;
    height: 2.5rem;
    place-items: center;
    border: 1px solid var(--metal-200);
    border-radius: .75rem;
    background: #fff;
    color: var(--metal-700);
    font-size: 1.05rem;
}

.table-responsive { border-radius: .65rem; }
.table { --bs-table-bg: transparent; margin-bottom: 0; }
.table thead th {
    padding: .85rem .8rem;
    border-bottom: 1px solid var(--metal-300);
    background: var(--metal-100);
    color: var(--metal-700);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .055em;
    text-transform: uppercase;
    white-space: nowrap;
}
.table tbody td { padding: .9rem .8rem; border-color: var(--metal-100); color: var(--metal-800); vertical-align: middle; }
.table-hover > tbody > tr:hover > * { --bs-table-bg-state: var(--metal-50); }
.table-striped > tbody > tr:nth-of-type(odd) > * { --bs-table-bg-type: #fafbfb; }
.table-actions { width: 1%; white-space: nowrap; }
.mail-preview-frame { display: block; width: 100%; height: min(68vh, 720px); border: 1px solid var(--metal-200); border-radius: .5rem; background: #fff; }
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    margin: .1rem .25rem .1rem 0;
    padding: .32rem .55rem;
    border: 1px solid var(--metal-200);
    border-radius: 99px;
    background: #fff;
    color: var(--metal-700);
    font-size: .75rem;
    font-weight: 600;
    white-space: nowrap;
}
.empty-state { padding: 2.5rem 1rem; color: var(--metal-600); text-align: center; }
.empty-state i { display: block; margin-bottom: .7rem; color: var(--metal-400); font-size: 2rem; }

.dataTables_wrapper { padding-top: .3rem; }
.dt-container .dt-search input, .dt-container .dt-length select {
    min-height: 38px;
    border: 1px solid var(--metal-300);
    border-radius: .55rem;
    background-color: #fff;
    color: var(--metal-900);
}
.dt-container .dt-search input { margin-left: .4rem; padding: .4rem .65rem; }
.dt-container .dt-info, .dt-container .dt-search label, .dt-container .dt-paging { color: var(--metal-600); font-size: .82rem; }
.dt-container .dt-paging .dt-paging-button { border-radius: .45rem !important; color: var(--metal-700) !important; }
.dt-container .dt-paging .dt-paging-button.current { border-color: var(--metal-700) !important; background: var(--metal-800) !important; color: #fff !important; }

.alert { border-radius: .7rem; }
.alert-danger, .alert-success {
    border-color: var(--metal-300);
    background: var(--metal-100);
    color: var(--metal-800);
}
.text-danger, .invalid-feedback { color: var(--metal-700) !important; }
.validation-summary-valid { display: none; }
.validation-summary-errors { margin-bottom: 1rem; }
.validation-summary-errors ul { margin: .4rem 0 0; padding-left: 1.2rem; }
.app-toast { overflow: hidden; border: 1px solid var(--metal-200); border-radius: .8rem; box-shadow: 0 14px 36px rgb(32 36 40 / 18%); }
.app-toast .toast-header { border-bottom-color: var(--metal-200); background: #fff; color: var(--metal-900); }
.app-toast .toast-body { background: var(--metal-50); color: var(--metal-800); }
.toast-success .toast-header > i, .toast-error .toast-header > i { color: var(--metal-700); }

.app-footer { padding: 1.1rem 0; border-top: 1px solid var(--metal-200); background: #fff; color: var(--metal-600); font-size: .8rem; }
.app-footer span { margin-inline: .35rem; color: var(--metal-400); }
.form-check-input:checked { border-color: var(--metal-800); background-color: var(--metal-800); }
code { padding: .15rem .35rem; border: 1px solid var(--metal-200); border-radius: .35rem; background: var(--metal-100); color: var(--metal-800); }

@media (max-width: 991.98px) {
    .app-navbar .navbar-collapse { padding: .75rem 0 1rem; }
    .navbar-nav { align-items: stretch !important; }
    .navbar-nav .nav-link { padding-inline: .2rem; }
}

@media (max-width: 575.98px) {
    .app-container { width: min(100% - 28px, 1200px); }
    .app-main { padding-top: 1.5rem; }
    .app-brand { gap: .6rem; font-size: 1.05rem; }
    .app-brand img { width: 112px; }
    .page-heading { align-items: flex-start; flex-direction: column; }
    .dt-container .dt-layout-row { gap: .6rem; }
    .dt-container .dt-search { text-align: left; }
}