/* ==========================================================================
   TaskFlowAI - Professional Design System (Refined)
   ========================================================================== */

:root {
    /* Main Palette - Trust & Clarity */
    --primary-color: #0F172A;
    /* Slate 900 (Dark Blue/Black) */
    --accent-color: #2563EB;
    /* Royal Blue (Action) */
    --accent-hover: #1D4ED8;

    /* Backgrounds */
    --bg-body: #F8FAFC;
    /* Slate 50 */
    --bg-sidebar: #FFFFFF;
    --bg-card: #FFFFFF;

    /* Text */
    --text-main: #0F172A;
    --text-muted: #64748B;

    /* Borders & Shadows */
    --border-color: #E2E8F0;
    --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 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Dimensions */
    --sidebar-width: 260px;
    --topbar-height: 70px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    letter-spacing: -0.025em;
    font-weight: 700;
}

a {
    text-decoration: none;
    transition: color 0.2s;
}

/* ==========================================
   Utility Classes
   ========================================== */
.btn-primary-custom {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.6rem 1.25rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.btn-primary-custom:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

.text-primary-custom {
    color: var(--accent-color);
}

.card-clean {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-clean:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.hover-lift {
    transition: transform 0.2s;
}

.hover-lift:hover {
    transform: translateY(-2px);
}

/* ==========================================
   Dashboard Layout (CRITICAL FIX)
   ========================================== */

/* Topbar */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1030;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 1rem;
    overflow-y: auto;
    z-index: 1020;
    transition: transform 0.3s ease;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: calc(var(--topbar-height) + 2rem) 2rem 2rem;
    min-height: 100vh;
}

/* Navigation Links */
.nav-link {
    color: var(--text-muted);
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
}

.nav-link i {
    font-size: 1.1rem;
}

.nav-link:hover {
    background-color: #F1F5F9;
    color: var(--text-main);
}

.nav-link.active {
    background-color: #EFF6FF;
    color: var(--accent-color);
    font-weight: 600;
}

/* ==========================================
   Responsive Logic
   ========================================== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding-top: calc(var(--topbar-height) + 1rem);
    }
}

/* ==========================================
   Landing Page Beautification
   ========================================== */
.hero-section {
    position: relative;
    padding: 8rem 0 6rem;
    background: radial-gradient(circle at top right, #EEF2FF 0%, #F8FAFC 40%, #FFFFFF 100%);
    overflow: hidden;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    background: linear-gradient(135deg, #0F172A 0%, #334155 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.glass-card-simple {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}