:root {
    /* --- Light Mode (Default) --- */
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --light: #f8f9fa;
    --dark: #212529;
    --bg-color: #eef2f6;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #8898aa;
    --border-color: #e0e0e0;
    --input-bg: #f8f9fa;
    --shadow: 0 10px 20px rgba(0,0,0,0.05);
}
/* --- LOGIN PAGE STYLES --- */
.login-body { 
    background-color: var(--bg-color); /* Theme ပေါ်မူတည်ပြီး နောက်ခံအရောင်ပြောင်းမယ် */
    height: 100vh; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    padding: 20px; 
    transition: background 0.3s;
}

.login-card { 
    background: var(--card-bg); 
    color: var(--text-color);
    padding: 40px 30px; 
    width: 100%; 
    max-width: 400px; /* ဖုန်းမှာ အပြည့်၊ ကွန်ပျူတာမှာ အကျဉ်း */
    border-radius: 20px; 
    box-shadow: var(--shadow); 
    text-align: center; 
    border: 1px solid var(--border-color);
    animation: popUp 0.5s ease-out;
}

.login-card h2 {
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 1.8rem;
}

.login-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

/* Error Message Box */
.error-msg {
    background: rgba(247, 37, 133, 0.1);
    color: var(--danger);
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--danger);
}

/* Input Fields in Login */
.login-card input {
    margin-bottom: 15px; /* ကွက်လပ်တွေကြား ခွာမယ် */
    background: var(--input-bg);
}

.login-btn {
    margin-top: 10px;
    padding: 15px;
    font-size: 1rem;
    background: var(--primary);
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}
.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
}

/* --- Dark Mode Variables --- */
[data-theme="dark"] {
    --primary: #4cc9f0; 
    --secondary: #4361ee;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --border-color: #333333;
    --input-bg: #2d2d2d;
    --shadow: 0 10px 20px rgba(0,0,0,0.3);
}

body { font-family: 'Poppins', sans-serif; background-color: var(--bg-color); color: var(--text-color); margin: 0; padding: 0; transition: background-color 0.3s, color 0.3s; }
.container { width: 100%; max-width: 1000px; margin: auto; padding: 20px; box-sizing: border-box; }

/* --- HEADER STYLES --- */
header {
    background: var(--card-bg); 
    padding: 10px 20px;
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    position: sticky; top: 0; z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: background 0.3s;
}

header h2 { 
    margin: 0; 
    font-size: 1.2rem; 
    font-weight: 700; 
    color: var(--primary); 
    white-space: nowrap;
}

.header-right { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
}

/* User Name Styling */
.user-name { 
    font-weight: 600; 
    color: var(--text-color); 
    font-size: 0.9rem; 
    display: flex; 
    align-items: center; 
    gap: 5px; 
}

/* Dark Mode Toggle */
.theme-toggle {
    background: var(--input-bg); 
    color: var(--text-color); 
    border: 1px solid var(--border-color);
    width: 35px; height: 35px; 
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; transition: 0.3s; font-size: 1rem;
}
.theme-toggle:hover { background: var(--border-color); }

/* Logout Button Styling */
.btn-logout { 
    background: #ffe5ec; 
    color: #f72585; 
    padding: 8px 16px; 
    border-radius: 50px; 
    font-size: 0.85rem; 
    text-decoration: none; 
    font-weight: 600; 
    display: flex; 
    align-items: center; 
    gap: 6px; 
    white-space: nowrap; 
    border: 1px solid transparent;
    transition: 0.2s;
}
.btn-logout:hover { 
    background: #f72585; 
    color: white; 
    box-shadow: 0 4px 10px rgba(247, 37, 133, 0.3);
}

/* --- MOBILE RESPONSIVE HEADER FIXES --- */
@media (max-width: 600px) {
    header { padding: 10px 15px; } 
    
    /* ဖုန်းမှာ နာမည်စာသားကို ဖျောက်မယ် (Icon ပဲကျန်မယ်) */
    .user-name span { display: none; }
    .user-name i { font-size: 1.2rem; color: var(--text-muted); } 

    /* ဖုန်းမှာ Logout စာသား ဖျောက်မယ် (Icon ပဲကျန်မယ်) */
    .btn-logout span { display: none; }
    .btn-logout { 
        padding: 0; 
        width: 35px; height: 35px; 
        justify-content: center; 
        border-radius: 50%; 
    }
}

/* --- CARDS --- */
.card-container { display: grid; grid-template-columns: 1fr; gap: 15px; margin-top: 25px; }
@media (min-width: 768px) { .card-container { grid-template-columns: repeat(3, 1fr); } }

.card {
    background: var(--card-bg); padding: 25px; border-radius: 16px;
    text-align: center; box-shadow: var(--shadow); position: relative; overflow: hidden;
    cursor: pointer; transition: transform 0.2s, box-shadow 0.2s, background 0.3s; border: 1px solid var(--border-color);
}
.card:hover { transform: translateY(-5px); }
.card.active-filter { border: 2px solid var(--primary); }

.card h3 { font-size: 0.85rem; margin: 0; opacity: 0.8; font-weight: 600; text-transform: uppercase; color: var(--text-muted); }
.card h2 { font-size: 2.2rem; margin: 10px 0 0; font-weight: 800; color: var(--text-color); }
.card.warning h2 { color: var(--warning); }
.card.danger h2 { color: var(--danger); }
.card.success h2 { color: var(--success); }

/* --- FORMS --- */
.add-form, .search-box { background: var(--card-bg); padding: 25px; border-radius: 16px; box-shadow: var(--shadow); margin-top: 25px; transition: background 0.3s; }
.form-grid { display: grid; grid-template-columns: 1fr; gap: 15px; }
@media (min-width: 768px) { .form-grid { grid-template-columns: repeat(3, 1fr); align-items: end; } .form-full-width { grid-column: span 3; } }

label { color: var(--text-muted); font-size: 12px; margin-bottom: 5px; display: block; }
input, select {
    width: 100%; padding: 12px 15px; border: 1px solid var(--border-color);
    background: var(--input-bg); color: var(--text-color); border-radius: 10px; box-sizing: border-box;
    transition: 0.3s;
}
input:focus, select:focus { outline: none; border-color: var(--primary); }

.input-group { display: flex; gap: 5px; }
.toggle-btn { 
    background: var(--input-bg); color: var(--text-color); border: 1px solid var(--border-color); 
    padding: 10px; border-radius: 10px; cursor: pointer; width: 45px; 
    display: flex; align-items: center; justify-content: center; 
}
.toggle-btn:hover { background: var(--border-color); }
.active-input { display: block; width: 100%; }
.hidden-input { display: none; }

button {
    width: 100%; padding: 12px; border: none; border-radius: 10px;
    background: var(--primary); color: #fff; font-weight: 600; cursor: pointer;
}

/* --- STOCK LIST --- */
.stock-list { margin-top: 20px; }
.stock-item {
    background: var(--card-bg); padding: 20px; margin-bottom: 15px; border-radius: 16px;
    box-shadow: var(--shadow); border-left: 5px solid var(--primary);
    display: flex; flex-direction: column; gap: 15px; transition: background 0.3s;
}
@media (min-width: 768px) {
    .stock-item { flex-direction: row; align-items: center; justify-content: space-between; padding: 15px 25px; }
    .stock-header { width: 30%; } 
    .stock-stats { width: 40%; background: none !important; padding: 0 !important; display: flex !important; justify-content: space-around; }
    .stock-actions { width: 20%; justify-content: flex-end; }
}

.stock-header { display: flex; justify-content: space-between; align-items: center; }
.stock-title h4 { margin: 0; font-size: 1.1rem; color: var(--text-color); }
.stock-title span { font-size: 0.85rem; color: var(--text-muted); }

.stock-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; background: var(--input-bg); padding: 10px; border-radius: 10px; text-align: center; }
.stat-box small { display: block; font-size: 0.7rem; color: var(--text-muted); }
.stat-box strong { font-size: 1rem; color: var(--text-color); }

.badge { padding: 4px 10px; border-radius: 20px; font-size: 0.7rem; font-weight: 700; }
.badge.normal { background: rgba(76, 201, 240, 0.2); color: #4cc9f0; }
.badge.low { background: rgba(248, 150, 30, 0.2); color: #f8961e; }
.badge.over { background: rgba(247, 37, 133, 0.2); color: #f72585; }

.stock-actions { display: flex; gap: 10px; }
.btn-icon { padding: 8px 15px; border-radius: 8px; font-size: 0.85rem; text-decoration: none; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 5px; }
.btn-edit { background: rgba(248, 150, 30, 0.1); color: #f8961e; }
.btn-del { background: rgba(247, 37, 133, 0.1); color: #f72585; }

/* Pagination */
.pagination { display: flex; justify-content: center; align-items: center; margin-top: 30px; gap: 8px; }
.page-link {
    display: inline-block; padding: 8px 16px; background: var(--card-bg); color: var(--text-color);
    border-radius: 8px; text-decoration: none; font-weight: 600; box-shadow: var(--shadow); border: 1px solid var(--border-color);
}
.page-link:hover { background: var(--border-color); }
.page-link.active { background: var(--primary); color: white; border-color: var(--primary); }
.page-link.disabled { background: var(--input-bg); color: var(--text-muted); pointer-events: none; }

/* Modal */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-content { background: var(--card-bg); color: var(--text-color); margin: 15% auto; padding: 30px; width: 90%; max-width: 350px; border-radius: 20px; text-align: center; animation: popUp 0.3s; }
@keyframes popUp { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }