/* ============================================
   SlatanHUB 5.0 — Professional Light System
   Clean, Readable, High-Performance UI
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+Thai:wght@400;500;600;700&display=swap');

:root {
    /* ☀️ Clean Light Palette */
    --color-bg-base: #F8FAFC;
    --color-bg-surface: #FFFFFF;
    --color-bg-elevated: #F1F5F9;
    --background-color: red;

    /* 🔴 Primary Action Colors */
    --color-primary: #E53E3E;
    --color-primary-hover: #C53030;
    --color-primary-light: #FFF5F5;

    /* 📝 Typography Colors (Standard High Contrast) */
    --color-text-primary: #1E293B;
    --color-text-secondary: #475569;
    --color-text-muted: #94A3B8;

    /* 🎨 UI Elements */
    --color-border: #E2E8F0;
    --color-white: #FFFFFF;

    /* 🟢 Status Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* 📏 Layout Metrics */
    --sidebar-width: 260px;
    --topbar-height: 64px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* 🔠 Typography Family & Scale */
    --font-heading: 'Inter', 'Noto Sans Thai', sans-serif;
    --font-body: 'Inter', 'Noto Sans Thai', sans-serif;
}

/* ======================== Reset & Global ======================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    font-size: 14px;
    /* Standard size for high readability */
    background: var(--color-bg-base);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
.page-title {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: all .2s;
}

.hidden {
    display: none !important;
}

/* ======================== Layout Structure ======================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--color-bg-surface);
    border-right: 1px solid var(--color-border);
    z-index: 101;
    display: flex;
    flex-direction: column;
}

.topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--topbar-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    z-index: 100;
}

.main-content {
    margin-top: var(--topbar-height);
    padding: 24px;
    min-height: calc(100vh - var(--topbar-height));
    transition: margin-left .3s;
}

body.has-sidebar .main-content {
    margin-left: var(--sidebar-width);
}

@media (max-width: 1024px) {
    body.has-sidebar .main-content {
        margin-left: 0;
    }
}

/* ======================== Sidebar Items ======================== */
.sidebar-logo {
    padding: 20px 24px;
    font-size: 18px;
    font-weight: 800;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    margin: 2px 12px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 13.5px;
    transition: all .2s;
}

.nav-item:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
}

.nav-item.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 600;
}

/* ======================== Components: Buttons ======================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 13.5px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all .2s;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(229, 62, 62, 0.2);
}

.btn-outline {
    background: #fff;
    border-color: var(--color-border);
    color: var(--color-text-secondary);
}

.btn-outline:hover {
    border-color: var(--color-text-primary);
    color: var(--color-text-primary);
    background: var(--color-bg-base);
}

/* ======================== Components: Cards ======================== */
.card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* ======================== Components: Inputs ======================== */
.form-control,
input,
select,
textarea {
    width: 100%;
    padding: 10px 14px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 13.5px;
    outline: none;
    transition: all .2s;
}

.form-control:focus,
input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(229, 62, 62, 0.1);
}

/* ======================== Task Specifics ======================== */
.task-card {
    background: var(--color-bg-surface) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius-md) !important;
    padding: 16px !important;
    transition: all .2s !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02) !important;
}

.task-card:hover {
    border-color: var(--color-primary) !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05) !important;
}

/* ======================== Components: Avatars ======================== */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50% !important;
    overflow: hidden;
    object-fit: cover;
    flex-shrink: 0;
}

.avatar-initials {
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
}

.kanban-col {
    background: var(--color-bg-base);
    border-radius: var(--radius-lg);
    padding: 12px;
    height: calc(100vh - 200px);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-border);
}

.kanban-list {
    flex: 1;
    overflow-y: auto;
    padding-right: 2px;
}

/* Spinner */
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-bg-base);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Drag & Drop */
.dragging {
    opacity: 0.4;
    transform: scale(0.98);
}

/* Scrollbar Light */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #E2E8F0;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #CBD5E1;
}

/* ======================== Responsive ======================== */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 0px;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform .3s;
    }

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

    .topbar {
        left: 0;
    }

    .main-content {
        margin-left: 0;
    }
}