:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --text: #172033;
    --muted: #64748b;
    --border: #e3eaf2;
    --primary: #0d9488;
    --primary-dark: #0f766e;
    --primary-soft: #e6f5f2;
    --gold: #d8a53c;
    --success: #15803d;
    --success-bg: #eaf8ef;
    --warning: #a16207;
    --warning-bg: #fff7e6;
    --danger: #b42318;
    --danger-bg: #fff0ee;
    --shadow: 0 8px 28px rgba(23, 32, 51, .06);
    --shadow-hover: 0 12px 32px rgba(23, 32, 51, .09);
    --radius: 16px;
    --radius-sm: 11px;
    --sidebar: 258px;
    --header: 72px;
    --focus: #5eead4;
    --ink: var(--text);
    --ink-soft: var(--muted);
    --paper: var(--surface);
    --paper-line: var(--border);
    --brass: var(--gold);
    --brass-deep: #a16207;
    --cyan: var(--primary);
    --green: var(--success);
    --yellow: #f8c24e;
    --panel: var(--surface);
    --panel-2: var(--surface-2);
    --soft-shadow: var(--shadow);
    --glow: 0 0 0 4px rgba(13, 148, 136, .12);
}

* { box-sizing: border-box; }

html {
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0;
}

body::before { content: none; }

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
}

button { cursor: pointer; }

img {
    max-width: 100%;
    height: auto;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 8px;
    color: var(--text);
    font-size: clamp(25px, 3vw, 34px);
    line-height: 1.2;
    letter-spacing: 0;
    font-weight: 800;
}

h2 {
    color: var(--text);
    letter-spacing: 0;
    font-weight: 800;
}

p { color: var(--muted); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.is-hidden { display: none !important; }

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar) minmax(0, 1fr);
    gap: 0;
    min-height: calc(100vh - var(--header));
    padding: 0;
    transition: grid-template-columns .23s ease;
}

.content-area {
    min-width: 0;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 28px clamp(18px, 3vw, 42px) 48px;
}

body.sidebar-collapsed .app-shell {
    grid-template-columns: 0 minmax(0, 1fr);
}

body.sidebar-collapsed .sidebar {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-24px);
}

@media (max-width: 900px) {
    :root { --sidebar: 235px; }

    .content-area {
        padding: 23px 20px 40px;
    }
}

@media (max-width: 700px) {
    :root { --header: 62px; }

    .app-shell {
        display: block;
        min-height: calc(100vh - var(--header));
    }

    .content-area {
        padding: 18px 14px 90px;
    }
}

@media (max-width: 360px) {
    .content-area {
        padding-left: 10px;
        padding-right: 10px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
        animation: none !important;
    }
}