/* =========================================
   Global Theme: Authoritative Blue (น้ำแข็งสะอาด จำกัด)
   ========================================= */
:root {
    --primary-color: #1e3a8a; /* Deep Blue */
    --primary-dark: #0f172a;  /* Navy Dark */
    --bg-color: #fdfbf7;      /* Warm Cream Background */
    --text-dark: #1e293b;     /* Charcoal Text */
    --text-muted: #475569;    /* Slate Gray Text */
    --border-color: #cbd5e1;
    --success-color: #059669; /* Darker Green */
    --danger-color: #dc2626;  /* Red */
    --warning-color: #d97706; /* Orange */
    --card-bg: #ffffff;
    --lock-color: #ffffff;    
}

/* =========================================
   Base Styles & Reset
   ========================================= */
*, *::before, *::after { box-sizing: border-box; }

html {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    background-attachment: fixed;
    min-height: 100%;
}

body { 
    font-family: 'Prompt', sans-serif; 
    background: transparent; /* ให้โปร่งใสเพื่อโชว์สีจาก html */
    color: var(--text-dark);
    margin: 0; padding: 15px; 
    display: flex; flex-direction: column; align-items: center; 
    min-height: 100vh;
    min-height: 100dvh;
    box-sizing: border-box;
}

button, input, select, textarea, a, span, div, h1, h2, h3, p { 
    font-family: 'Prompt', sans-serif; 
}

/* =========================================
   Main Layout (Container & Header)
   ========================================= */
.container {
    background: var(--card-bg); 
    width: 100%; max-width: 600px; 
    padding: 15px 20px 20px 20px; 
    border-radius: 12px; 
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    box-sizing: border-box;
    position: relative;
}

.header-row {
    text-align: center; 
    border-bottom: 2px solid var(--primary-color); 
    padding-bottom: 10px; margin-bottom: 15px;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: nowrap;
}

.header-row h2 { 
    margin: 0; color: var(--primary-dark); font-size: 20px; flex: 1; text-align: left; white-space: nowrap; 
}
        
.header-actions { 
    display: flex; align-items: center; gap: 8px; flex-shrink: 0; 
}

/* =========================================
   Buttons & Badges
   ========================================= */
.btn-action-top, .btn-back {
    padding: 6px 12px; border-radius: 6px; text-decoration: none; 
    font-size: 14px; font-weight: 600; border: 1px solid;
    display: flex; align-items: center; justify-content: center; gap: 6px;
    white-space: nowrap; cursor: pointer; transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.btn-back-normal, .btn-back { 
    background-color: #ffffff; color: var(--primary-color); border-color: var(--border-color); 
}
.btn-back-normal:hover, .btn-back:hover { 
    background-color: #f1f5f9; border-color: var(--primary-color); 
}
.btn-back:active { transform: scale(0.95); }

.btn-back-clear { 
    background-color: #fef2f2; color: var(--danger-color); border-color: #fca5a5; 
}
.btn-back-clear:hover { 
    background-color: #fee2e2; border-color: #ef4444; 
}

.lock-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #ffffff; border: none;
    padding: 10px 15px; border-radius: 8px; font-size: 15px; font-weight: 600;
    text-align: center; margin-bottom: 15px; display: none;
    justify-content: center; align-items: center; gap: 8px;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.25); 
}

/* =========================================
   Global Utilities & SweetAlert
   ========================================= */
@keyframes fadeIn { 
    from { opacity: 0; transform: translateY(5px); } 
    to { opacity: 1; transform: translateY(0); } 
}

.swal2-popup { font-family: 'Prompt', sans-serif !important; border-radius: 16px !important; }
.swal-shop-img { width: 100%; max-height: 400px; object-fit: contain; border-radius: 8px; margin-top: 10px; border: 1px solid var(--border-color); }