:root {
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-soft: rgba(99, 102, 241, 0.08);
    --primary-soft-hover: rgba(99, 102, 241, 0.14);
    --success-color: #10b981;
    --danger-color: #ef4444;

    --bg-color: #f5f7fb;
    --bg-card: #ffffff;
    --bg-subtle: #fafbff;
    --bg-hover: #f1f5f9;

    --border-color: #e8ecf3;
    --border-hover: #d4dae6;
    --border-light: #eef1f7;

    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --shadow-sm: 0 1px 2px rgba(30, 41, 59, 0.04);
    --shadow-md: 0 4px 16px rgba(99, 102, 241, 0.06), 0 1px 3px rgba(30, 41, 59, 0.04);
    --shadow-lg: 0 8px 24px rgba(99, 102, 241, 0.08), 0 2px 6px rgba(30, 41, 59, 0.04);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;

    --mono-font: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, 'Courier New', monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    min-height: 100vh;
    background: var(--bg-color);
    background-image:
        radial-gradient(at 20% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 80% 100%, rgba(99, 102, 241, 0.04) 0px, transparent 50%);
    background-attachment: fixed;
    padding: 16px;
    max-width: 1140px;
    margin: 0 auto;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    gap: 12px;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    padding: 6px 0 2px;
}

.title {
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.3px;
}

.title::after {
    content: '';
    display: block;
    width: 56px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
    margin: 8px auto 0;
    opacity: 0.7;
}

/* ===== Section 通用 ===== */
.section {
    background: var(--bg-card);
    padding: 14px 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    width: 100%;
}

.section:hover {
    border-color: var(--border-hover);
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.main-content > .section {
    flex: 1 1 0;
    min-width: 0;
}

.section-title {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 14px;
    font-weight: 600;
    padding-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.2px;
}

.section-title::before {
    content: '';
    width: 3px;
    height: 14px;
    background: linear-gradient(180deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

/* ===== 算法选择区域 ===== */
.algo-section {
    background: var(--bg-card);
    border-color: var(--border-color);
}

.algo-section .section-title {
    border-bottom: 1px solid var(--border-light);
}

.algo-wrap {
    margin-top: 4px;
    display: flex;
    gap: 0;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.algo-group {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.algo-group:not(:last-child)::after {
    content: '|';
    color: var(--border-color);
    font-size: 12px;
    font-weight: 400;
    margin: 0 10px;
    opacity: 0.8;
}

.algo-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 9px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
    user-select: none;
    border: 1px solid transparent;
}

.algo-item:hover {
    background: var(--primary-soft);
    color: var(--primary-color);
    border-color: rgba(99, 102, 241, 0.15);
}

.algo-item input[type="checkbox"] {
    width: 13px;
    height: 13px;
    accent-color: var(--primary-color);
    cursor: pointer;
    margin: 0;
}

.algo-item input[type="checkbox"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== 结果标题与清空按钮 ===== */
.result-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.result-header-row .section-title {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
    flex: 1;
    min-width: 0;
}

.clear-inline {
    padding: 5px 12px;
    border: 1px solid rgba(239, 68, 68, 0.25);
    border-radius: var(--radius-sm);
    background: rgba(239, 68, 68, 0.04);
    color: var(--danger-color);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
    white-space: nowrap;
    line-height: 1.4;
}

.clear-inline:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.4);
}

.clear-inline:active {
    transform: scale(0.97);
}

/* ===== 输入区域 ===== */
.input-wrapper {
    position: relative;
    flex: 1;
    min-height: 200px;
}

.dual-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    resize: none;
    font-size: 13px;
    flex: 1;
    min-height: 200px;
    outline: none;
    background: var(--bg-subtle);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
    line-height: 1.6;
}

.dual-input::placeholder {
    color: var(--text-muted);
}

.dual-input:focus {
    border-color: var(--primary-color);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.dual-input.drag-over {
    border-color: var(--primary-color);
    border-style: dashed;
    background: var(--primary-soft);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.file-indicator {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-subtle);
    border: 1px dashed var(--primary-light);
    border-radius: var(--radius-md);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 10;
}

.file-indicator.show {
    opacity: 1;
}

.file-indicator .file-icon {
    font-size: 38px;
    margin-bottom: 8px;
    filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.15));
}

.file-indicator .file-info {
    text-align: center;
}

.file-indicator .file-count-text {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 2px;
}

.file-indicator .file-hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
}

.file-indicator .cursor {
    position: absolute;
    top: 12px;
    left: 12px;
    width: 2px;
    height: 16px;
    background: var(--primary-color);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ===== 哈希结果容器 ===== */
.result-container {
    width: 100%;
    min-height: 220px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fbfcfe;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--mono-font);
    box-shadow: inset 0 1px 2px rgba(30, 41, 59, 0.02);
}

.result-container::-webkit-scrollbar {
    width: 6px;
}

.result-container::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 3px;
}

.result-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.result-container::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

.empty-tip {
    display: none;
}

/* ===== 结果分组 ===== */
.result-section {
    width: 100%;
    padding-top: 6px;
    border-top: 1px dashed var(--border-light);
    margin-top: 6px;
}

.result-section:first-child {
    padding-top: 0;
    border-top: none;
    margin-top: 0;
}

.result-header {
    margin-bottom: 6px;
    padding-left: 4px;
}

.result-type {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.2px;
}

/* ===== 哈希卡片（终端风格） ===== */
.hash-card {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    padding: 5px 8px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    font-size: 12px;
    line-height: 1.6;
    border: 1px solid transparent;
}

.hash-card:hover {
    background: var(--primary-soft);
    border-color: rgba(99, 102, 241, 0.12);
}

.hash-card::before {
    content: '›';
    color: var(--primary-color);
    font-weight: bold;
    flex-shrink: 0;
    line-height: 1.6;
    opacity: 0.7;
}

.copy-btn {
    width: 18px;
    height: 18px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: #fff;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 1px;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.copy-btn.copied {
    background: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}

.hash-algo {
    color: var(--primary-color);
    font-weight: 600;
    flex-shrink: 0;
    line-height: 1.6;
    min-width: 60px;
    text-align: right;
    font-size: 12px;
    letter-spacing: 0.2px;
}

.hash-value {
    flex: 1;
    color: var(--text-primary);
    word-break: break-all;
    white-space: normal;
    cursor: pointer;
    border-radius: 3px;
    padding: 0 4px;
    transition: background var(--transition-fast), color var(--transition-fast);
    line-height: 1.6;
    font-size: 12px;
}

.hash-value:hover {
    background: var(--primary-soft-hover);
    color: var(--primary-dark);
}

.hash-value.copied {
    background: rgba(16, 185, 129, 0.12);
    color: var(--success-color);
}

/* ===== 文件信息 ===== */
.file-group {
    border-top: 1px dashed var(--border-light);
    padding-top: 6px;
    margin-top: 6px;
}

.file-group:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.file-group.new-flash {
    animation: fileFlash 1.2s ease-out;
}

@keyframes fileFlash {
    0% {
        background: rgba(99, 102, 241, 0.18);
        border-radius: 6px;
    }
    100% {
        background: transparent;
        border-radius: 0;
    }
}

.file-info {
    margin-bottom: 6px;
    padding-left: 10px;
}

.file-title-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 2px;
    flex-wrap: wrap;
}

.file-info .file-name {
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    word-break: break-all;
    line-height: 1.4;
}

.file-info .file-size {
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 400;
    font-family: 'Inter', sans-serif;
    flex-shrink: 0;
}

.file-info .file-path {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--mono-font);
    word-break: break-all;
    margin-top: 2px;
    opacity: 0.85;
}

.file-count {
    font-size: 11px;
    color: var(--primary-color);
    margin-bottom: 8px;
    padding-left: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
}

/* ===== Loading ===== */
.action-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 8px;
}

.loading {
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    display: none;
    padding: 10px 20px;
    background: var(--primary-soft);
    border-radius: var(--radius-md);
    border: 1px solid rgba(99, 102, 241, 0.15);
    animation: pulse 1.8s ease-in-out infinite;
    font-family: 'Inter', sans-serif;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.55; }
}

/* ===== Toast 提示 ===== */
.custom-tip {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-12px);
    padding: 10px 22px;
    border-radius: var(--radius-md);
    background: #fff;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    pointer-events: none;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 6px;
}

.custom-tip::before {
    content: '✓';
    color: var(--success-color);
    font-weight: 700;
    font-size: 14px;
}

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

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    padding: 12px 16px;
    color: var(--text-muted);
    font-size: 11px;
    letter-spacing: 0.3px;
}

.footer p {
    position: relative;
    display: inline-block;
}

.footer p::before,
.footer p::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 24px;
    height: 1px;
    background: var(--border-color);
}

.footer p::before {
    right: 100%;
    margin-right: 10px;
}

.footer p::after {
    left: 100%;
    margin-left: 10px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    body {
        padding: 10px;
        max-width: 100%;
    }

    .title {
        font-size: 19px;
    }

    .section {
        padding: 12px;
    }

    .section-title {
        font-size: 13px;
    }

    .algo-wrap {
        gap: 4px;
    }

    .algo-group {
        gap: 4px;
    }

    .algo-group:not(:last-child)::after {
        display: none;
    }

    .algo-item {
        padding: 4px 8px;
        font-size: 11px;
    }

    .dual-input {
        min-height: 160px;
        font-size: 12px;
        padding: 10px 12px;
    }

    .input-wrapper {
        min-height: 160px;
    }

    .result-container {
        min-height: 180px;
        padding: 8px;
    }

    .hash-card {
        font-size: 11px;
        padding: 4px 6px;
    }

    .hash-algo {
        min-width: 68px;
        font-size: 11px;
    }

    .hash-value {
        font-size: 11px;
    }

    .copy-btn {
        width: 16px;
        height: 16px;
    }

    .file-info .file-name {
        font-size: 12px;
    }

    .custom-tip {
        width: 90%;
        max-width: 320px;
        padding: 8px 14px;
        font-size: 12px;
    }

    .footer p::before,
    .footer p::after {
        width: 16px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 8px;
    }

    .title {
        font-size: 17px;
    }

    .section {
        padding: 10px;
    }

    .algo-item {
        padding: 3px 6px;
    }

    .hash-algo {
        min-width: 60px;
    }
}