:root {
    --color-primary: #ff9a9e;
    --color-primary-dark: #d63384;
    --color-secondary: #5fc5eb;
    --color-secondary-dark: #0a58ca;
    --color-success: #28a745;
    --color-bg-light: rgba(255, 255, 255, 0.85);
    --color-bg-dark: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    -ms-text-size-adjust: none;
    text-size-adjust: none;
}

body {
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 50%, #ff9a9e 100%);
    background-image: url('https://t.alcy.cc/ysz');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    padding: 1rem;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}

.main-content {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.progress-container {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    z-index: 1000;
    width: calc(100% - 2rem);
    max-width: 500px;
}

.progress-container.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.progress-container.hide {
    transform: translateX(-50%) translateY(-100%);
    opacity: 0;
}

.progress-bar-wrapper {
    background: var(--color-bg-light);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    border: 2px solid rgba(255, 182, 193, 0.4);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.progress-bar {
    position: relative;
    height: 8px;
    background: var(--color-bg-dark);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-primary), rgba(255, 206, 230, 0.9));
    background-size: 200% 100%;
    border-radius: var(--radius-sm);
    transition: width var(--transition-fast);
    animation: shimmer 2s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.progress-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
}

.progress-text {
    font-size: 0.875rem;
    color: #555;
    font-weight: 500;
}

.progress-text.completed {
    color: var(--color-primary-dark);
}

.progress-percent {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    min-width: 3.5rem;
    text-align: right;
}

.progress-percent.completed {
    color: var(--color-success);
}

.button-container {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 0.5rem;
}

.convert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    min-width: 130px;
    min-height: 44px;
    -webkit-tap-highlight-color: transparent;
    -webkit-appearance: none;
    appearance: none;
    touch-action: manipulation;
}

.btn-icon {
    font-size: 1.125rem;
    flex-shrink: 0;
}

.btn-text {
    white-space: nowrap;
    flex-shrink: 0;
}

.audio-btn {
    background: rgba(255, 122, 158, 0.25);
    color: var(--color-primary-dark);
    border-color: rgba(255, 122, 158, 0.5);
}

.image-btn {
    background: rgba(95, 197, 235, 0.25);
    color: var(--color-secondary-dark);
    border-color: rgba(95, 197, 235, 0.5);
}

.convert-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.audio-btn:hover {
    background: rgba(255, 122, 158, 0.35);
    border-color: rgba(255, 122, 158, 0.7);
}

.image-btn:hover {
    background: rgba(95, 197, 235, 0.35);
    border-color: rgba(95, 197, 235, 0.7);
}

.convert-btn:active {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .button-container {
        gap: 0.75rem;
    }
    
    .convert-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9375rem;
        min-width: 110px;
        min-height: 40px;
    }
    
    .btn-icon {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    html {
        font-size: 14px;
    }
    
    .button-container {
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.25rem;
    }
    
    .convert-btn {
        width: 100%;
        max-width: 260px;
        padding: 0.875rem 1.25rem;
        font-size: 0.9375rem;
        gap: 0.5rem;
        min-height: 44px;
    }
    
    .btn-icon {
        font-size: 1.125rem;
    }
    
    .progress-container {
        top: 0.5rem;
        width: calc(100% - 1rem);
    }
    
    .progress-bar-wrapper {
        padding: 0.5rem 0.75rem;
    }
    
    .progress-bar {
        height: 6px;
    }
    
    .progress-status {
        margin-top: 0.5rem;
    }
    
    .progress-text,
    .progress-percent {
        font-size: 0.75rem;
    }
}

@media (max-width: 320px) {
    .button-container {
        gap: 0.5rem;
    }
    
    .convert-btn {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
        min-width: 100px;
        min-height: 40px;
    }
    
    .btn-icon {
        font-size: 1rem;
    }
}

@media (min-width: 1024px) {
    html {
        font-size: 17px;
    }
    
    .button-container {
        gap: 1.25rem;
    }
    
    .convert-btn {
        padding: 1rem 1.75rem;
        font-size: 1.125rem;
        min-width: 150px;
        min-height: 50px;
    }
    
    .btn-icon {
        font-size: 1.375rem;
    }
}

@media (min-width: 1200px) {
    html {
        font-size: 18px;
    }
    
    .button-container {
        gap: 1.5rem;
    }
    
    .convert-btn {
        padding: 1.125rem 2rem;
        font-size: 1.125rem;
        min-width: 160px;
        min-height: 54px;
    }
    
    .btn-icon {
        font-size: 1.5rem;
    }
}