/* =========================
   Base
   ========================= */
:root {
    --bg: #eff4fb;
    --bg-ink: #0f172a;
    --panel: #ffffff;
    --panel-soft: #f5f8fc;
    --border: #d7e0ec;
    --border-strong: #c4d0df;
    --shadow: 0 20px 48px rgba(15, 23, 42, 0.08);
    --shadow-soft: 0 8px 24px rgba(15, 23, 42, 0.06);
    --accent: #1767d3;
    --accent-dark: #0e4fa8;
    --accent-2: #214f95;
    --muted: #5f6f86;
    --success: #15803d;
    --danger: #b42338;
    --warning: #b45309;
    --info: #155a8a;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --font-xs: 11px;
    --font-sm: 12px;
    --font-md: 14px;
    --font-lg: 18px;
    --font-sans: "Avenir Next", "Segoe UI Variable", "Trebuchet MS", "Helvetica Neue", sans-serif;
    --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
    --focus-ring: #1d4ed8;
    --focus-shadow: rgba(29, 78, 216, 0.22);
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { min-height: 100%; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background:
        radial-gradient(960px 420px at 0% -10%, rgba(23, 103, 211, 0.08), transparent 60%),
        radial-gradient(880px 360px at 100% 0%, rgba(14, 79, 168, 0.06), transparent 56%),
        linear-gradient(180deg, #f7f9fc 0%, #eef3f9 100%);
    color: var(--bg-ink);
    font-family: var(--font-sans);
    letter-spacing: -0.01em;
    font-size: var(--font-md);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
::selection {
    background: rgba(23, 103, 211, 0.18);
    color: #081325;
}
button,
input,
textarea,
select {
    font: inherit;
    color: inherit;
}
.page-shell {
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    padding: var(--safe-area-top) var(--safe-area-right) var(--safe-area-bottom) var(--safe-area-left);
    position: relative;
    transition: background .24s ease;
}
.page-panel {
    min-height: calc(100vh - var(--safe-area-top) - var(--safe-area-bottom));
    min-height: calc(100svh - var(--safe-area-top) - var(--safe-area-bottom));
    min-height: calc(100dvh - var(--safe-area-top) - var(--safe-area-bottom));
    display: flex;
    flex-direction: column;
    background: var(--panel);
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.panel-header {
    padding: var(--space-4) var(--space-4);
    border-bottom: 1px solid var(--border-strong);
    font-weight: 700;
    background: linear-gradient(180deg, #fbfdff 0%, #f4f8fd 100%);
    color: #111827;
    font-family: var(--font-serif);
    font-size: var(--font-lg);
}

.customer-panel--chat {
    display: grid;
    grid-template-rows: auto auto minmax(0, 1fr) auto;
    min-height: calc(100vh - var(--safe-area-top) - var(--safe-area-bottom));
    min-height: calc(100svh - var(--safe-area-top) - var(--safe-area-bottom));
    min-height: calc(100dvh - var(--safe-area-top) - var(--safe-area-bottom));
}

.admin-page-panel {
    flex: 1;
    min-height: 0;
}
.admin-page-panel--login {
    overflow: visible;
}

.admin-detail-shell {
    min-width: 0;
    min-height: 0;
}
.brand-header {
    display: flex;
    align-items: center;
    gap: 12px;
}
.brand-logo {
    height: 28px;
    width: auto;
    display: block;
    filter: drop-shadow(0 8px 20px rgba(15, 23, 42, 0.06));
}
.brand-title {
    font-weight: 700;
    color: #12243b;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}