/* ==========================================================================
   EduSched SaaS - Premium Master Theme
   ========================================================================== */

:root {
    /* Dimensions */
    --sidebar-width: 280px;
    --sidebar-collapsed: 80px;
    --topbar-height: 75px;
    
    /* Color Palette */
    --primary-color: #3b82f6;       /* Blue */
    --primary-hover: #2563eb;
    --sidebar-bg: #0f172a;          /* Indigo Dark */
    --sidebar-hover: rgba(255, 255, 255, 0.06);
    --body-bg: #f8fafc;             /* Slate 50 - สะอาดตา */
    --text-main: #334155;
    --text-muted: #64748b;
    
    /* Shadows (Soft & Premium) */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.03), 0 2px 4px rgba(0, 0, 0, 0.02);
    --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.08);
}

/* --- Global Settings --- */
body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--body-bg);
    color: var(--text-main);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Sidebar Styling --- */
#sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background-color: var(--sidebar-bg);
    color: #e2e8f0;
    z-index: 1050;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.06);
}

/* --- Main Wrapper --- */
#main-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Collapsed State (Sidebar Toggle) --- */
body.sidebar-toggled #sidebar {
    width: var(--sidebar-collapsed);
}

body.sidebar-toggled #main-wrapper {
    margin-left: var(--sidebar-collapsed);
}

body.sidebar-toggled #sidebar .menu-text,
body.sidebar-toggled #sidebar .menu-header,
body.sidebar-toggled #sidebar .brand-name small {
    display: none;
    opacity: 0;
}

body.sidebar-toggled #sidebar .brand-name span {
    font-size: 1.2rem !important; /* ย่อโลโก้ */
}

body.sidebar-toggled #sidebar .nav-link {
    justify-content: center;
    padding: 12px 0;
    margin: 8px 12px;
}

body.sidebar-toggled #sidebar .nav-link i {
    margin-right: 0 !important;
    font-size: 1.4rem;
}

/* --- Glassmorphism Topbar --- */
.topbar {
    height: var(--topbar-height);
    /* Glass Effect */
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Topbar Toggle Button */
.toggle-btn {
    cursor: pointer;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: var(--text-muted);
    background: transparent;
    transition: 0.2s ease;
}

.toggle-btn:hover {
    background: #f1f5f9;
    color: var(--primary-color);
}

/* --- Premium Content Cards --- */
.card-premium {
    background: #ffffff;
    border: none;
    border-radius: 1.25rem; /* rounded-xl */
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
}

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

.card-body-spaced {
    padding: 2rem; /* White Space Management ให้สมดุล */
}

/* --- Utilities & Typography --- */
.text-primary-custom { color: var(--primary-color) !important; }
.bg-primary-custom { background-color: var(--primary-color) !important; }

/* Custom Scrollbar สำหรับความพรีเมียม */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}