:root {
    --bg-color: #eef0f2;
    --panel-bg: #ffffff;
    --text-main: #111111;
    --text-dim: #555555;
    --border-color: #cccccc;
    --accent-color: #0056b3;
    --error-color: #cc0000;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    line-height: 1.4;
    overflow-x: hidden;
}

/* Light industrial grid background */
.parallax-bg {
    background-image: linear-gradient(0deg, transparent 24%, rgba(0, 0, 0, .03) 25%, rgba(0, 0, 0, .03) 26%, transparent 27%, transparent 74%, rgba(0, 0, 0, .03) 75%, rgba(0, 0, 0, .03) 76%, transparent 77%, transparent), linear-gradient(90deg, transparent 24%, rgba(0, 0, 0, .03) 25%, rgba(0, 0, 0, .03) 26%, transparent 27%, transparent 74%, rgba(0, 0, 0, .03) 75%, rgba(0, 0, 0, .03) 76%, transparent 77%, transparent);
    background-size: 50px 50px;
    background-attachment: fixed;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

header h1 {
    font-size: 24px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-main);
}

header p {
    color: var(--text-dim);
    font-size: 12px;
    font-weight: bold;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: 2px 2px 0px rgba(0,0,0,0.08); /* Hard shadow for industrial look */
}

.panel h2 {
    font-size: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
    margin-bottom: 15px;
    color: var(--accent-color);
}

.instruction-box {
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    padding: 15px;
    margin-bottom: 20px;
    text-align: center;
}

.instruction-box h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
    font-size: 16px;
}

.instruction-box p {
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 10px;
}

.wechat-qr {
    max-width: 150px;
    height: auto;
    margin-top: 10px;
    border: 1px solid var(--border-color);
    box-shadow: 2px 2px 0px rgba(0,0,0,0.05);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

label {
    font-size: 12px;
    margin-bottom: 5px;
    color: var(--text-dim);
    font-weight: bold;
}

input[type="text"], input[type="file"] {
    background: #fdfdfd;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px;
    font-family: inherit;
    transition: all 0.2s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-color);
    background: #ffffff;
    box-shadow: 0 0 0 2px rgba(0, 86, 179, 0.15);
}

input[readonly] {
    opacity: 0.7;
    background: #e9e9e9;
    cursor: not-allowed;
}

.actions {
    text-align: right;
    margin-top: 20px;
}

.btn-primary {
    background: #ffffff;
    color: var(--text-main);
    border: 2px solid var(--text-main);
    padding: 12px 30px;
    font-size: 16px;
    font-family: inherit;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.2s;
}

.btn-primary:hover:not(:disabled) {
    background: var(--text-main);
    color: #ffffff;
}

.btn-primary:disabled {
    border-color: var(--border-color);
    color: var(--text-dim);
    cursor: wait;
    background: #f0f0f0;
}

.status-msg {
    margin-top: 15px;
    padding: 10px;
    border: 1px solid;
    text-align: center;
    font-weight: bold;
}

.status-msg.hidden {
    display: none;
}

.status-msg.success {
    border-color: #28a745;
    color: #155724;
    background: #d4edda;
}

.status-msg.error {
    border-color: var(--error-color);
    color: var(--error-color);
    background: #f8d7da;
}