:root {
    --primary-color: #ff6b00;
    --primary-hover: #ff4500;
    --error-color: #ff3333;
    --success-color: #4CAF50;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f0f8ff;
    margin: 0;
    padding: 20px;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

h1::after {
    content: "";
    display: block;
    width: 100px;
    height: 3px;
    background: var(--primary-color);
    margin: 10px auto;
}

.form-group {
    margin-bottom: 20px;
    position: relative;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 5px rgba(255, 107, 0, 0.3);
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    display: block;
    margin: 30px auto;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

.submit-btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {
    0% {
        transform: scale(0, 0);
        opacity: 0.5;
    }
    100% {
        transform: scale(20, 20);
        opacity: 0;
    }
}

.image-container {
    text-align: center;
    margin: 30px 0;
    position: relative;
}

.image-container img {
    max-width: 100%;
    border-radius: 5px;
    transition: transform 0.3s;
}

.image-container img:hover {
    transform: scale(1.02);
}

.fullscreen-message {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: black;
    color: red;
    font-size: 48px;
    text-align: center;
    padding-top: 20%;
    z-index: 9999;
    animation: shake 0.5s;
    animation-iteration-count: infinite;
}

@keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(3px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(3px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.footer {
    text-align: center;
    margin-top: 30px;
    color: #666;
    font-size: 14px;
}

.countdown {
    text-align: center;
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: bold;
}

.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
    margin-left: 5px;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.loading {
    display: none;
    text-align: center;
    margin: 20px 0;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top: 4px solid var(--primary-color);
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.success-message {
    display: none;
    text-align: center;
    color: var(--success-color);
    font-size: 18px;
    margin: 20px 0;
}