/* ============================================
   一键去水印 - 全局样式表
   设计风格：大胆极简化（Bold Minimalism）
   色彩方案：黑+白+亮黄强调色
   ============================================ */

/* CSS 变量 */
:root {
    --color-primary: #000000;
    --color-accent: #FFD600;
    --color-bg: #F5F5F5;
    --color-white: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-light: #666666;
    --color-border: #E0E0E0;
    --color-error: #E53935;
    --color-success: #43A047;
    --radius: 4px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, 'Microsoft YaHei', BlinkMacSystemFont, sans-serif;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* 图片默认响应式 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 按钮通用样式 */
button {
    cursor: pointer;
    font-family: var(--font-family);
    border: none;
    outline: none;
    transition: transform 0.15s ease-out, box-shadow 0.15s ease-out;
}

button:hover {
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ============================================
   Header（顶部导航）
   ============================================ */
.header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-white);
}

.header__inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header__logo {
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.header__tagline {
    font-size: 13px;
    color: var(--color-text-light);
}

/* ============================================
   Main（主内容区）
   ============================================ */
.main {
    flex: 1;
    width: 100%;
}

/* ============================================
   Upload Area（上传区域）
   ============================================ */
.upload-area {
    padding: 60px 24px 80px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: calc(100vh - 160px);
}

.upload-area__inner {
    width: 100%;
    max-width: 640px;
    text-align: center;
}

.upload-area__drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    padding: 80px 32px;
    transition: border-color 0.2s ease, background-color 0.2s ease;
    cursor: pointer;
}

.upload-area__drop-zone:hover,
.upload-area__drop-zone--active {
    border-color: var(--color-primary);
    background-color: rgba(0,0,0,0.02);
}

.upload-area__drop-zone--active {
    border-style: solid;
    border-width: 3px;
}

.upload-area__icon {
    margin-bottom: 16px;
    color: var(--color-text-light);
}

.upload-area__icon svg {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
}

.upload-area__text {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.upload-area__subtext {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 28px;
}

.upload-area__btn-select {
    margin-bottom: 0;
}

.upload-area__divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 36px 0;
    color: var(--color-text-light);
    font-size: 14px;
}

.upload-area__divider::before,
.upload-area__divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--color-border);
}

/* ============================================
   Processing Area（处理中区域）
   ============================================ */
.processing-area {
    padding: 120px 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.processing-area__inner {
    text-align: center;
}

.processing-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 24px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.processing-text {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.processing-subtext {
    font-size: 14px;
    color: var(--color-text-light);
}

/* ============================================
   Result Area（结果区域）
   ============================================ */
.result-area {
    padding: 48px 24px 80px;
}

.result-area__inner {
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.result-area__title {
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 32px;
}

.result-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 40px;
    text-align: center;
}

.result-comparison__item {
    position: relative;
}

.result-comparison__item img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: contain;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.result-comparison__label {
    display: block;
    margin-top: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-light);
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   Button Variants（按钮变体）
   ============================================ */

/* 主按钮（黑色填充） */
.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}

/* 强调按钮（黄色） */
.btn--accent {
    background-color: var(--color-accent);
    color: var(--color-primary);
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 700;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-md);
}

.btn--accent:hover {
    background-color: #FFE033;
}

/* 描边按钮 */
.btn--outline {
    background-color: transparent;
    color: var(--color-primary);
    padding: 13px 27px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn--outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* 次级按钮 */
.btn--secondary {
    background-color: transparent;
    color: var(--color-text);
    padding: 13px 27px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn--secondary:hover {
    border-color: var(--color-text-light);
}

/* 按钮图标尺寸 */
.btn svg {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

/* ============================================
   Footer（页脚）
   ============================================ */
.footer {
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg);
    margin-top: auto;
}

.footer__text {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer__disclaimer {
    font-size: 12px;
    color: var(--color-text-light);
}

/* ============================================
   Toast通知组件
   ============================================ */
.toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    display: flex;
    flex-direction: column-reverse;
    gap: 8px;
    pointer-events: none;
    max-width: 90vw;
    width: 360px;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    box-shadow: var(--shadow-md);
    animation: toast-in 0.25s ease-out forwards;
    pointer-events: auto;
}

@keyframes toast-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.toast--success {
    background-color: #E8F5E9;
    color: #1B5E20;
    border-left: 4px solid var(--color-success);
}

.toast--error {
    background-color: #FFEBEE;
    color: #B71C1C;
    border-left: 4px solid var(--color-error);
}

.toast--info {
    background-color: #E3F2FD;
    color: #0D47A1;
    border-left: 4px solid #1976D2;
}

/* ============================================
   选择框覆盖层（用于选水印区域）
   ============================================ */
.selection-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
}

.selection-rect {
    position: absolute;
    border: 2px dashed var(--color-accent);
    background-color: rgba(255,214,0,0.08);
    pointer-events: none;
}

/* ============================================
   响应式适配
   ============================================ */

/* 平板和手机 */
@media (max-width: 768px) {
    .header {
        padding: 16px 16px;
    }
    
    .upload-area {
        padding: 40px 16px 60px;
    }
    
    .upload-area__drop-zone {
        padding: 56px 20px;
    }
    
    /* 结果对比改为上下堆叠 */
    .result-comparison {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    /* 操作按钮堆叠 */
    .result-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .result-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }
    
    .header__logo {
        font-size: 19px;
    }
    
    .upload-area__drop-zone {
        padding: 40px 16px;
    }
    
    .btn {
        min-height: 44px; /* 手指友好 */
    }
}