/* ==========================================================================
   FreelanceNow – Master Responsive Design System
   Modern CSS3 with Clean Hierarchy, Mobile-First Responsiveness & Accessibility
   ========================================================================== */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --accent: #10b981;
    --accent-hover: #059669;
    --accent-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --dark: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-600: #475569;
    --slate-400: #94a3b8;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--slate-700);
    background-color: var(--bg-light);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--primary-hover);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.5rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
    margin-bottom: 1rem;
}

/* Container */
.container {
    width: 100%;
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

/* Navigation Header */
.site-header {
    background-color: var(--white);
    border-bottom: 1px solid var(--slate-200);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.brand-badge {
    background: linear-gradient(135deg, var(--primary), #3b82f6);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    font-weight: 600;
    color: var(--slate-600);
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1.4;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease-in-out;
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    color: var(--white);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.btn-accent {
    background-color: var(--accent);
    color: var(--white);
}
.btn-accent:hover {
    background-color: var(--accent-hover);
    color: var(--white);
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.25);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--slate-200);
    color: var(--slate-700);
}
.btn-outline:hover {
    background-color: var(--slate-100);
    border-color: var(--slate-400);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.85rem 1.75rem;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Badges & Tags */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.65rem;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary { background-color: var(--primary-light); color: var(--primary); }
.badge-success { background-color: var(--accent-light); color: var(--accent-hover); }
.badge-warning { background-color: var(--warning-light); color: #b45309; }
.badge-danger { background-color: var(--danger-light); color: var(--danger); }
.badge-secondary { background-color: var(--slate-100); color: var(--slate-600); }

/* Flash Alerts */
.alert-container {
    margin-top: 1.25rem;
    margin-bottom: 1.25rem;
}

.alert {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success { background-color: var(--accent-light); border-color: #a7f3d0; color: #065f46; }
.alert-danger { background-color: var(--danger-light); border-color: #fecaca; color: #991b1b; }
.alert-info { background-color: var(--primary-light); border-color: #bfdbfe; color: #1e40af; }
.alert-warning { background-color: var(--warning-light); border-color: #fde68a; color: #92400e; }

/* Cards & Grid */
.card {
    background-color: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--slate-200);
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 60-Minute Bidding Countdown Timer Component */
.countdown-box {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background-color: #fff1f2;
    border: 1px solid #fecdd3;
    color: #e11d48;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

.countdown-box.urgent {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--slate-800);
    margin-bottom: 0.4rem;
}

.form-control {
    width: 100%;
    padding: 0.65rem 0.95rem;
    font-family: inherit;
    font-size: 0.92rem;
    color: var(--dark);
    background-color: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea.form-control {
    min-height: 110px;
    resize: vertical;
}

.form-help {
    font-size: 0.78rem;
    color: var(--slate-400);
    margin-top: 0.25rem;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th, .table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--slate-200);
    vertical-align: middle;
}

.table th {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--slate-400);
    background-color: var(--slate-100);
}

.table tbody tr:hover {
    background-color: var(--bg-light);
}

/* Dashboard Layout */
.dashboard-wrapper {
    display: flex;
    min-height: calc(100vh - 72px);
}

.dashboard-sidebar {
    width: 260px;
    background-color: var(--white);
    border-right: 1px solid var(--slate-200);
    padding: 1.5rem 1rem;
    flex-shrink: 0;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.95rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--slate-600);
    transition: all 0.15s;
}

.sidebar-link:hover, .sidebar-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
}

.dashboard-main {
    flex-grow: 1;
    padding: 2rem 2.5rem;
    overflow-y: auto;
}

/* Chat & Messaging */
.chat-box {
    display: flex;
    flex-direction: column;
    height: 480px;
    background-color: var(--white);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.chat-messages {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background-color: var(--bg-light);
}

.message-bubble {
    max-width: 75%;
    padding: 0.85rem 1.15rem;
    border-radius: var(--radius-lg);
    font-size: 0.92rem;
    position: relative;
}

.message-bubble.me {
    align-self: flex-end;
    background-color: var(--primary);
    color: var(--white);
    border-bottom-right-radius: var(--radius-sm);
}

.message-bubble.other {
    align-self: flex-start;
    background-color: var(--white);
    color: var(--dark);
    border: 1px solid var(--slate-200);
    border-bottom-left-radius: var(--radius-sm);
}

.message-meta {
    font-size: 0.72rem;
    margin-top: 0.3rem;
    opacity: 0.8;
    text-align: right;
}

.chat-input-bar {
    padding: 1rem;
    background-color: var(--white);
    border-top: 1px solid var(--slate-200);
    display: flex;
    gap: 0.75rem;
}

/* Tabs */
.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--slate-200);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--slate-600);
    cursor: pointer;
    position: relative;
    bottom: -2px;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Advertisement Display Placements */
.ad-slot-leaderboard {
    margin: 1.5rem auto;
    text-align: center;
    max-width: 728px;
    padding: 0.5rem;
    background-color: var(--slate-100);
    border-radius: var(--radius-md);
    border: 1px dashed var(--slate-400);
}

.ad-slot-sidebar {
    margin-bottom: 1.5rem;
    text-align: center;
    background-color: var(--slate-100);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border: 1px dashed var(--slate-400);
}

.ad-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    color: var(--slate-400);
    letter-spacing: 0.5px;
    margin-bottom: 0.35rem;
}

/* Footer */
.site-footer {
    margin-top: auto;
    background-color: var(--dark);
    color: var(--slate-400);
    padding: 3.5rem 0 2rem;
    border-top: 1px solid var(--slate-800);
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-heading {
    color: var(--white);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: var(--slate-400);
}

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

.footer-bottom {
    border-top: 1px solid var(--slate-800);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
}

/* Responsiveness */
@media (max-width: 992px) {
    .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .dashboard-wrapper { flex-direction: column; }
    .dashboard-sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--slate-200); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
    .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
    .header-inner { height: auto; padding: 1rem 0; flex-direction: column; gap: 0.75rem; }
    .main-nav { flex-wrap: wrap; justify-content: center; }
    .footer-inner { grid-template-columns: 1fr; }
    .dashboard-main { padding: 1.25rem 0.75rem; }
}