:root {
    --bg-app: #0f172a;
    --bg-panel: #1e293b;
    --bg-card: #283548;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #334155;

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

[data-theme="light"] {
    --bg-app: #f1f5f9;
    --bg-panel: #ffffff;
    --bg-card: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
    display: flex;
    transition: background-color 0.3s, color 0.3s;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-20px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

.animate-slide-in {
    animation: slideIn 0.3s ease-out forwards;
}

/* Layout */
#app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    z-index: 10;
    transition: background 0.3s;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.nav-item:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    position: relative;
}

/* Header & Search */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
}

.search-container {
    position: relative;
    width: 300px;
}

.search-input {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 2rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
    width: 320px;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.action-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-panel);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.action-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 10px;
    height: 10px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid var(--bg-app);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.875rem;
    font-weight: 700;
}

.btn {
    padding: 0.6rem 1.2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* Common Grid & Cards */
.grid-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: background 0.3s;
}

/* Analytics Charts */
.chart-container {
    height: 200px;
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    padding: 1rem 0;
}

.bar-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    height: 100%;
    gap: 0.5rem;
    cursor: pointer;
}

.bar {
    width: 100%;
    background: var(--primary);
    border-radius: 4px 4px 0 0;
    transition: height 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0.8;
}

.bar:hover {
    opacity: 1;
}

.bar-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Kanban */
.kanban-board {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - 14rem);
    overflow-x: auto;
    padding-bottom: 1rem;
}

.kanban-column {
    flex: 0 0 320px;
    background: var(--bg-panel);
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    max-height: 100%;
    border: 1px solid var(--border);
}

.column-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
}

.task-list {
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.task-card {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid transparent;
    cursor: grab;
    transition: all 0.2s;
}

.task-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.task-meta {
    display: flex;
    justify-content: space-between;
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.badge {
    padding: 0.2rem 0.5rem;
    border-radius: 99px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Table */
.table-container {
    background: var(--bg-card);
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--bg-panel);
    width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    border-radius: 1rem;
    border: 1px solid var(--border);
    padding: 2rem;
    transform: translateY(20px);
    transition: transform 0.2s;
    box-shadow: var(--shadow-lg);
}

.modal-overlay.open .modal {
    transform: translateY(0);
}

.modal-header {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text-primary);
}

/* Task Details Extras */
.detail-section {
    margin-top: 1.5rem;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.2s;
}

.subtask-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.comment-box {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 0.75rem;
    padding: 1rem;
    margin-top: 1rem;
    display: flex;
    gap: 0.75rem;
}

/* Calendar */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border);
    border-radius: 1rem;
    overflow: hidden;
}

.calendar-cell {
    background: var(--bg-card);
    min-height: 100px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.cal-event {
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    cursor: pointer;
}

/* Theme Toggle */
.theme-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn:hover {
    background: var(--bg-card);
    color: var(--warning);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-lg);
    z-index: 200;
    transform: translateY(100px);
    transition: transform 0.3s;
}

.toast.show {
    transform: translateY(0);
}

.toast.toast-success i {
    color: var(--success);
}
/* Login Styles */
.login-container { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg-app); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.login-card { width: 400px; padding: 2.5rem; background: var(--bg-panel); border: 1px solid var(--border); border-radius: 1.5rem; box-shadow: var(--shadow-lg); display: flex; flex-direction: column; gap: 1.5rem; }
.login-brand { text-align: center; font-size: 2rem; font-weight: 800; margin-bottom: 1rem; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Attachments & Tags */
.file-item { display:flex; align-items:center; gap:0.5rem; padding:0.5rem; background:rgba(255,255,255,0.05); border:1px solid var(--border); border-radius:0.5rem; margin-bottom:0.5rem; }
.file-icon { color:var(--primary); }
.tag-input-container { display:flex; flex-wrap:wrap; gap:0.5rem; padding:0.5rem; border:1px solid var(--border); border-radius:0.5rem; background:var(--bg-app); }
.tag-pill { background:var(--primary); color:white; padding:0.1rem 0.5rem; border-radius:1rem; font-size:0.75rem; display:flex; align-items:center; gap:0.3rem; }
.priority-select { padding:0.3rem; border-radius:0.3rem; font-weight:bold; }
.priority-high { color:var(--danger); border-color:var(--danger); }
.priority-med { color:var(--warning); border-color:var(--warning); }