/* ── Variables ───────────────────────────────────────────── */
:root {
    --color-navy:       #1B3A6B;
    --color-navy-dark:  #122849;
    --color-navy-light: #2a508f;
    --color-accent:     #1B3A6B;

    --color-bg:         #F5F6F8;
    --color-surface:    #FFFFFF;
    --color-border:     #E2E5EA;

    --color-text:       #1A1D23;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;

    --color-error:      #DC2626;
    --color-error-bg:   #FEF2F2;
    --color-success:    #16A34A;
    --color-success-bg: #F0FDF4;

    --font-family:      'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs:     0.75rem;
    --font-size-sm:     0.875rem;
    --font-size-base:   1rem;
    --font-size-lg:     1.125rem;
    --font-size-xl:     1.25rem;
    --font-size-2xl:    1.5rem;

    --radius-sm:        4px;
    --radius:           8px;
    --radius-lg:        12px;

    --shadow-sm:        0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow:           0 4px 12px rgba(0,0,0,.08);

    --sidebar-width:    220px;
    --topbar-height:    56px;
    --bottomnav-height: 60px;

    --transition:       150ms ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

img, svg { display: block; max-width: 100%; }

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

/* ── Layout — desktop (sidebar) ─────────────────────────── */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-navy);
    letter-spacing: -0.01em;
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.sidebar-footer {
    padding: 12px 0;
    border-top: 1px solid var(--color-border);
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    padding: 32px;
}

/* ── Layout — mobile (bottom nav) ───────────────────────── */
@media (max-width: 768px) {
    .sidebar { display: none; }

    .main-content {
        margin-left: 0;
        padding: 20px 16px calc(var(--bottomnav-height) + 16px);
    }

    .bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--bottomnav-height);
        background: var(--color-surface);
        border-top: 1px solid var(--color-border);
        z-index: 100;
        padding-bottom: env(safe-area-inset-bottom);
    }
}

@media (min-width: 769px) {
    .bottom-nav { display: none; }
}

/* ── Topbar (mobile only) ────────────────────────────────── */
.topbar {
    display: none;
}

@media (max-width: 768px) {
    .topbar {
        display: flex;
        align-items: center;
        height: var(--topbar-height);
        padding: 0 16px;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        font-weight: 600;
        color: var(--color-navy);
        letter-spacing: -0.01em;
        position: sticky;
        top: 0;
        z-index: 50;
    }
}

/* ── Page titles ─────────────────────────────────────────── */
.page-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.page-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: -20px;
    margin-bottom: 24px;
}