/* ============================================================================
   LinkedIn-Inspired Design System - Main Stylesheet
   ============================================================================ */

:root {
    /* LinkedIn Color Palette */
    --ln-blue: #0077B5;
    --ln-blue-dark: #004182;
    --ln-blue-hover: #004182;
    --ln-bg: #F3F2EF;
    --ln-white: #FFFFFF;
    --ln-border: #E0DFDC;
    --ln-text: #191919;
    --ln-text-secondary: #666666;
    --ln-text-placeholder: #999;
    --ln-success: #057642;
    --ln-error: #CC1016;
    --ln-warning: #E06B05;
    --ln-premium: #915907;
    --ln-premium-bg: #FDF6EC;
    --ln-shadow: 0 0 0 1px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.08);
    --ln-radius: 8px;
    --ln-font: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

    /* Topbar Height */
    --ln-topbar-height: 52px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--ln-font);
    background-color: var(--ln-bg);
    color: var(--ln-text);
    line-height: 1.5;
}

/* ============================================================================
   Typography
   ============================================================================ */

h1 {
    font-size: 32px;
    font-weight: 600;
    color: var(--ln-text);
    margin: 0 0 1rem 0;
}

h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--ln-text);
    margin: 0 0 0.75rem 0;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--ln-text);
    margin: 0 0 0.5rem 0;
}

p {
    margin: 0 0 1rem 0;
}

small, .text-small {
    font-size: 12px;
}

.text-secondary, .text-muted {
    color: var(--ln-text-secondary);
}

.text-placeholder {
    color: var(--ln-text-placeholder);
}

/* ============================================================================
   Links
   ============================================================================ */

a {
    color: var(--ln-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--ln-blue-dark);
    text-decoration: underline;
}

/* ============================================================================
   Cards & Containers
   ============================================================================ */

.ln-card, .card {
    background: var(--ln-white);
    border-radius: var(--ln-radius);
    box-shadow: var(--ln-shadow);
    padding: 16px;
    border: 1px solid var(--ln-border);
}

.ln-card:hover {
    box-shadow: 0 0 0 1px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.12);
}

.container {
    max-width: 1128px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn, button {
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    padding: 8px 24px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.ln-btn-primary, .btn-primary {
    background-color: var(--ln-blue);
    color: var(--ln-white);
    border: 1px solid var(--ln-blue);
}

.ln-btn-primary:hover, .btn-primary:hover {
    background-color: var(--ln-blue-dark);
    border-color: var(--ln-blue-dark);
}

.ln-btn-secondary, .btn-secondary {
    background-color: var(--ln-white);
    color: var(--ln-blue);
    border: 1px solid var(--ln-blue);
}

.ln-btn-secondary:hover, .btn-secondary:hover {
    background-color: #E7F3FF;
}

.ln-btn-ghost, .btn-ghost {
    background-color: transparent;
    color: var(--ln-text);
    border: 1px solid var(--ln-border);
}

.ln-btn-ghost:hover, .btn-ghost:hover {
    background-color: var(--ln-bg);
    border-color: var(--ln-text-secondary);
}

.btn-danger {
    background-color: transparent;
    color: var(--ln-error);
    border: 1px solid var(--ln-error);
}

.btn-danger:hover {
    background-color: rgba(204, 16, 22, 0.1);
}

/* ============================================================================
   Badges
   ============================================================================ */

.ln-badge, .badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    background-color: var(--ln-bg);
    color: var(--ln-text-secondary);
    border: 1px solid var(--ln-border);
}

.badge-success {
    background-color: #DFFCF0;
    color: var(--ln-success);
    border-color: var(--ln-success);
}

.badge-error {
    background-color: #FFE5E5;
    color: var(--ln-error);
    border-color: var(--ln-error);
}

.badge-warning {
    background-color: #FEF0E5;
    color: var(--ln-warning);
    border-color: var(--ln-warning);
}

.badge-premium {
    background-color: var(--ln-premium-bg);
    color: var(--ln-premium);
    border-color: var(--ln-premium);
}

/* ============================================================================
   Form Elements
   ============================================================================ */

input, textarea, select {
    font-family: inherit;
    font-size: 14px;
    padding: 10px 12px;
    border: 1px solid var(--ln-border);
    border-radius: var(--ln-radius);
    background-color: var(--ln-white);
    color: var(--ln-text);
    transition: all 0.2s ease;
}

input::placeholder, textarea::placeholder {
    color: var(--ln-text-placeholder);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--ln-blue);
    box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.1);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--ln-text);
}

label input[type="checkbox"],
label input[type="radio"] {
    margin-right: 8px;
    cursor: pointer;
}

/* ============================================================================
   Alerts & Notifications
   ============================================================================ */

.alert {
    padding: 12px 16px;
    border-radius: var(--ln-radius);
    border: 1px solid;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #DFFCF0;
    color: var(--ln-success);
    border-color: var(--ln-success);
}

.alert-error {
    background-color: #FFE5E5;
    color: var(--ln-error);
    border-color: var(--ln-error);
}

.alert-warning {
    background-color: #FEF0E5;
    color: var(--ln-warning);
    border-color: var(--ln-warning);
}

.alert-info {
    background-color: #E7F3FF;
    color: var(--ln-blue);
    border-color: var(--ln-blue);
}

/* ============================================================================
   Loading Spinner
   ============================================================================ */

.spinner {
    border: 2px solid var(--ln-border);
    border-top-color: var(--ln-blue);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================================================
   Topbar Navigation
   ============================================================================ */

.ln-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--ln-topbar-height);
    background-color: var(--ln-white);
    border-bottom: 1px solid var(--ln-border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 24px;
    z-index: 100;
    box-shadow: var(--ln-shadow);
}

.ln-nav .nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 16px;
    color: var(--ln-blue);
    text-decoration: none;
    min-width: fit-content;
}

.ln-nav .nav-logo img {
    width: 32px;
    height: 32px;
}

.ln-nav .nav-search {
    flex: 1;
    max-width: 300px;
}

.ln-nav .nav-search input {
    width: 100%;
    padding: 8px 16px;
    background-color: var(--ln-bg);
    border: none;
    border-radius: 20px;
    font-size: 13px;
}

.ln-nav .nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.ln-nav .nav-links a {
    font-size: 13px;
    font-weight: 500;
    color: var(--ln-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

.ln-nav .nav-links a:hover {
    color: var(--ln-blue);
}

.ln-nav .nav-links .btn {
    margin: 0;
}

/* Account for fixed topbar */
body.with-topbar {
    padding-top: var(--ln-topbar-height);
}

/* ============================================================================
   Footer
   ============================================================================ */

.site-footer, footer {
    background-color: var(--ln-white);
    border-top: 1px solid var(--ln-border);
    padding: 32px 24px;
    margin-top: 64px;
}

.footer-inner {
    max-width: 1128px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 32px;
    align-items: start;
    margin-bottom: 24px;
}

.footer-inner > div {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-inner strong {
    color: var(--ln-blue);
    font-size: 14px;
}

.footer-inner p {
    font-size: 12px;
    color: var(--ln-text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.footer-links a {
    font-size: 12px;
    color: var(--ln-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--ln-blue);
}

.site-footer small {
    display: block;
    text-align: center;
    font-size: 11px;
    color: var(--ln-text-secondary);
    border-top: 1px solid var(--ln-border);
    padding-top: 16px;
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-center {
    justify-content: center;
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (max-width: 1024px) {
    .ln-nav {
        padding: 0 16px;
        gap: 16px;
    }

    .ln-nav .nav-search {
        max-width: 200px;
    }
}

@media (max-width: 768px) {
    .ln-nav {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
        gap: 12px;
    }

    .ln-nav .nav-search {
        order: 3;
        flex-basis: 100%;
        max-width: 100%;
    }

    .ln-nav .nav-links {
        order: 2;
        flex-wrap: wrap;
        gap: 12px;
        margin-left: 0;
    }

    body.with-topbar {
        padding-top: auto;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 18px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}