/* 全局样式重置和变量定义 */
:root {
    --primary-color: #2D7AF6;
    --secondary-color: #1D1D1F;
    --background-color: #F5F7FA;
    --border-color: #D2D2D7;
    --success-color: #28CD41;
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.5;
    background-color: var(--background-color);
    color: var(--secondary-color);
    padding: 40px 20px;
    min-height: 100vh;
    background-image: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
}

/* 头部样式 */
header {
    text-align: center;
    margin: 0 auto 60px;
    max-width: 600px;
}

h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #2D7AF6, #14B8F6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(45, 122, 246, 0.1);
}

.subtitle {
    font-size: 21px;
    color: #5A6677;
    font-weight: 400;
    position: relative;
    display: inline-block;
}

.demo-number {
    position: absolute;
    top: -8px;
    right: -120px;
    font-size: 16px;
    color: var(--primary-color);
    font-weight: 500;
}

/* 主要内容区域 */
main {
    max-width: 680px;
    margin: 0 auto;
    margin-bottom: 40px;
    background: white;
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

/* 输入区域样式 */
.input-section {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
}

input {
    flex: 1;
    height: 48px;
    padding: 0 20px;
    border: 2px solid #E4E9F2;
    border-radius: 12px;
    font-size: 17px;
    transition: var(--transition);
    background: #F8FAFC;
    caret-color: var(--primary-color);
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(45, 122, 246, 0.1);
    background: white;
}

button {
    height: 48px;
    padding: 0 24px;
    border: none;
    border-radius: 12px;
    background-color: var(--primary-color);
    color: white;
    font-size: 17px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background-image: linear-gradient(135deg, #2D7AF6, #14B8F6);
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(45, 122, 246, 0.2);
}

/* 结果展示区域 */
.result-section {
    margin-bottom: 32px;
    opacity: 1;
    transition: var(--transition);
}

.result-section.hidden {
    display: none;
    opacity: 0;
}

.result-box {
    background-color: #F8FAFC;
    border-radius: 12px;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
    border: 2px solid #E4E9F2;
}

#resultText {
    font-size: 24px;
    font-weight: 500;
    color: var(--primary-color);
}

#copyBtn {
    background-image: linear-gradient(135deg, #28CD41, #1DB954);
}

/* 使用说明区域 */
.instruction-section {
    background-color: #F8FAFC;
    border-radius: 12px;
    padding: 24px;
    border: 2px solid #E4E9F2;
}

.instruction-section h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--secondary-color);
    background: linear-gradient(135deg, #2D7AF6, #14B8F6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.instruction-section ol {
    padding-left: 24px;
    margin-bottom: 20px;
}

.instruction-section li {
    margin-bottom: 12px;
    color: #1D1D1F;
}

.tips {
    padding-top: 20px;
    border-top: 2px solid #E4E9F2;
}

.tips p {
    color: #6E6E73;
    font-size: 15px;
    margin-bottom: 8px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 16px 16px 32px;
    }

    main {
        padding: 24px 20px;
        border-radius: 16px;
        margin-bottom: 24px;
    }

    h1 {
        font-size: 28px;
        margin-bottom: 12px;
    }

    .subtitle {
        font-size: 17px;
        padding: 0 20px;
        margin-bottom: 8px;
    }

    .input-section {
        flex-direction: column;
        margin-bottom: 32px;
        position: relative;
        background: white;
        padding: 20px;
        border-radius: 16px;
        border: 2px solid #E4E9F2;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }

    input {
        height: 52px;
        font-size: 16px;
        -webkit-appearance: none;
        appearance: none;
        border-width: 2px;
        background: white;
        margin-bottom: 4px;
        text-align: center;
        font-size: 20px;
        letter-spacing: 1px;
        font-weight: 500;
    }

    input::placeholder {
        color: #A0AEC0;
        font-size: 17px;
        letter-spacing: 0;
        font-weight: normal;
    }

    button {
        width: 100%;
        height: 48px;
        font-size: 17px;
        font-weight: 600;
        margin-top: 8px;
    }

    .result-box {
        padding: 16px;
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }

    #resultText {
        font-size: 20px;
        text-align: center;
        word-break: break-all;
    }

    .instruction-section {
        padding: 20px;
    }

    .instruction-section h2 {
        font-size: 20px;
        margin-bottom: 16px;
    }

    .instruction-section li {
        font-size: 15px;
        margin-bottom: 10px;
    }

    .tips p {
        font-size: 14px;
    }

    #message-container {
        width: calc(100% - 32px);
        max-width: 300px;
    }

    .message {
        text-align: center;
        justify-content: center;
    }

    .demo-section {
        margin-bottom: 32px;
    }

    .demo-section h2 {
        font-size: 20px;
        margin-bottom: 16px;
    }

    .demo-image {
        padding: 12px;
    }

    .demo-image img {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        display: block;
        margin: 0 auto;
    }

    .demo-main {
        margin-bottom: 40px;
    }

    .demo-number {
        position: static;
        display: block;
        margin-top: 4px;
        font-size: 15px;
    }
}

/* 针对超小屏幕的优化 */
@media (max-width: 360px) {
    h1 {
        font-size: 24px;
    }

    .subtitle {
        font-size: 15px;
    }

    main {
        padding: 20px 16px;
    }

    #resultText {
        font-size: 18px;
    }

    .input-section {
        padding: 16px;
    }

    input {
        height: 48px;
        font-size: 18px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-box {
    animation: fadeIn 0.3s ease-out;
}

/* 消息提示样式 */
#message-container {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    pointer-events: none;
}

.message {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 16px;
    border-radius: 8px;
    box-shadow: 0 3px 6px -4px rgba(0, 0, 0, 0.12), 
                0 6px 16px 0 rgba(0, 0, 0, 0.08), 
                0 9px 28px 8px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
    backdrop-filter: blur(8px);
}

.message.show {
    opacity: 1;
    transform: translateY(0);
}

.message::before {
    content: "✓";
    font-weight: bold;
    color: #52c41a;
}

/* 效果示意区域 */
.demo-section {
    margin-bottom: 40px;
    text-align: center;
}

.demo-section h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--secondary-color);
    background: linear-gradient(135deg, #2D7AF6, #14B8F6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.demo-image {
    background: #F8FAFC;
    border-radius: 12px;
    padding: 20px;
    border: 2px solid #E4E9F2;
    overflow: hidden;
}

.demo-image img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    margin: 0 auto;
}