:root {
    /* Professional color palette */
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #dbeafe;
    --success: #15803d;
    --success-bg: #dcfce7;
    --danger: #b91c1c;
    --danger-bg: #fee2e2;
    --warning: #a16207;
    --warning-bg: #fef9c3;
    --info: #0369a1;
    --info-bg: #e0f2fe;

    /* Neutrals */
    --bg: #f1f5f9;
    --surface: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: #cbd5e1;
    --border-light: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.04);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.06);
    --radius: 6px;
    --radius-sm: 4px;

    /* Layout - slightly less compact */
    --nav-height: 52px;
    --max-width: 1400px;
    --space: 0.875rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

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

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--space) * 1.25);
}

main.container {
    padding-top: calc(var(--space) * 1.25);
    padding-bottom: calc(var(--space) * 2.5);
    min-height: calc(100vh - var(--nav-height) - 56px);
}

/* Navigation */
.app-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.app-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand a {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
}
.nav-brand a:hover { text-decoration: none; color: var(--primary); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 3px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    display: block;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.88rem;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-light);
    text-decoration: none;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.nav-user a { font-weight: 500; }

.nav-user-mobile { display: none; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: 7px;
    cursor: pointer;
    color: var(--text);
}
.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 640px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
        padding: 6px calc(var(--space) * 1.25);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 10px 14px; }
    .nav-user { display: none; }
    .nav-user-mobile {
        display: block;
        padding: 10px 14px;
        border-top: 1px solid var(--border-light);
        color: var(--text-secondary);
        font-size: 0.85rem;
    }
}

/* Typography */
h1, h2, h3, h4 { margin: 0 0 0.55em; line-height: 1.25; color: var(--text); }
h1 { font-size: 1.45rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }

p { margin: 0 0 0.7em; color: var(--text-secondary); }
p:last-child { margin-bottom: 0; }

/* Page header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: calc(var(--space) * 1.1);
    flex-wrap: wrap;
}
.page-header h1 { margin-bottom: 0; }

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: calc(var(--space) * 1.15);
    box-shadow: var(--shadow-sm);
    margin-bottom: calc(var(--space) * 1.1);
}
.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 0.6rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font: inherit;
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.12s;
    white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}
.btn-secondary:hover { background: var(--border-light); }
.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { background: #991b1b; }
.btn-sm { padding: 5px 10px; font-size: 0.78rem; }

/* Action bar */
.actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: calc(var(--space) * 1.1);
    flex-wrap: wrap;
}
.actions form {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: calc(var(--space) * 1.15);
}

label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="file"],
textarea,
select,
.input {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font: inherit;
    font-size: 0.9rem;
    transition: border-color 0.12s, box-shadow 0.12s;
}
input:focus,
textarea:focus,
select:focus,
.input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}
input[type="file"] { padding: 5px; font-size: 0.85rem; }

textarea { min-height: 120px; resize: vertical; }

.form-group { margin-bottom: calc(var(--space) * 1.1); }
.form-group:last-child { margin-bottom: 0; }

/* Tables */
.data-table {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.data-table table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th,
.data-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}
.data-table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: #f8fafc; }
.data-table td { font-size: 0.88rem; }

@media (max-width: 768px) {
    .data-table thead { display: none; }
    .data-table table,
    .data-table tbody,
    .data-table tr,
    .data-table td { display: block; width: 100%; }
    .data-table tr {
        margin-bottom: calc(var(--space) * 1.1);
        border: 1px solid var(--border);
        border-radius: var(--radius-sm);
        padding: 10px;
        background: var(--surface);
    }
    .data-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 6px 0;
        border-bottom: 1px solid var(--border-light);
    }
    .data-table td:last-child { border-bottom: none; }
    .data-table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 0.72rem;
        text-transform: uppercase;
        color: var(--text-secondary);
        margin-right: 12px;
    }
}

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 5px; }
.tag {
    display: inline-flex;
    align-items: center;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 0.74rem;
    font-weight: 500;
}
.tag a { color: inherit; }
.tag a:hover { text-decoration: none; }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: capitalize;
}
.badge-draft { background: var(--border-light); color: var(--text-secondary); }
.badge-sent { background: var(--info-bg); color: #075985; }
.badge-won { background: var(--success-bg); color: #166534; }
.badge-lost { background: var(--danger-bg); color: #991b1b; }
.badge-info { background: var(--info-bg); color: #075985; }
.badge-log { background: var(--border-light); color: var(--text-secondary); }

/* Alerts */
.alert {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    margin-bottom: calc(var(--space) * 1.1);
    font-size: 0.88rem;
}
.alert-success { background: var(--success-bg); color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: var(--danger-bg); color: #991b1b; border: 1px solid #fecaca; }
.alert-info { background: var(--info-bg); color: #075985; border: 1px solid #bae6fd; }

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space);
    background: var(--bg);
}
.login-box {
    width: 100%;
    max-width: 360px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: calc(var(--space) * 1.75);
    box-shadow: var(--shadow);
}
.login-box h1 {
    text-align: center;
    margin-bottom: 0.2em;
    font-size: 1.25rem;
}
.login-box .subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--space);
    font-size: 0.9rem;
}
.login-box .btn { width: 100%; margin-top: 4px; }

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: calc(var(--space) * 1.1);
}
.app-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: calc(var(--space) * 1.15);
    box-shadow: var(--shadow-sm);
}
.app-card h3 { margin-bottom: 0.4em; font-size: 0.95rem; }
.app-card p { margin-bottom: 0.85em; font-size: 0.85rem; }

/* Markdown body */
.markdown-body {
    background: var(--surface);
    padding: calc(var(--space) * 1.15);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    font-size: 0.93rem;
}
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 { margin-top: 1.25em; margin-bottom: 0.55em; }
.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child { margin-top: 0; }
.markdown-body p { margin-bottom: 0.65em; }
.markdown-body code {
    background: var(--border-light);
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.86em;
    color: var(--text);
}
.markdown-body pre {
    background: var(--text);
    color: var(--bg);
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: calc(var(--space) * 2.25) var(--space);
    color: var(--text-secondary);
}
.empty-state h3 { margin-bottom: 0.4em; font-size: 1.05rem; }

/* Utility */
.text-muted { color: var(--text-secondary); }
.text-right { text-align: right; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 7px; }
.gap-3 { gap: 10px; }
.mt-1 { margin-top: var(--space); }
.mt-2 { margin-top: calc(var(--space) * 1.25); }
.mb-0 { margin-bottom: 0; }
.w-full { width: 100%; }

.footer {
    padding: calc(var(--space) * 1.1) calc(var(--space) * 1.25);
    color: var(--text-muted);
    font-size: 0.78rem;
    text-align: center;
    border-top: 1px solid var(--border);
}