/* 现代化加密工具样式 */

/* CSS变量定义 */
:root {
    --primary-color: #667eea;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-color: #f093fb;
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-color: #4facfe;
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-color: #ffecd2;
    --warning-gradient: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    --danger-color: #ff9a9e;
    --danger-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-input: #0e3460;
    
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-muted: #8892b0;
    
    --border-color: #233554;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #5a6fd8;
}

/* 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 0 2rem;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-logo i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    transition: var(--transition);
    z-index: -1;
}

.nav-link:hover::before,
.nav-link.active::before {
    left: 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* 主要内容区域 */
.main-content {
    margin-top: 70px;
    padding: 2rem;
    min-height: calc(100vh - 70px);
}

.content-section {
    display: none;
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 区域标题 */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 卡片容器 */
.card-container {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(102, 126, 234, 0.05);
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-header i {
    color: var(--primary-color);
}

.card-body {
    padding: 2rem;
}

/* 输入组样式 */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-group i {
    color: var(--primary-color);
}

/* 输入框样式 */
input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    resize: vertical;
    min-height: 50px;
}

textarea {
    min-height: 120px;
    font-family: inherit;
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: rgba(14, 52, 96, 0.8);
}

input[type="text"]::placeholder,
input[type="password"]::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    min-height: 48px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled:hover::before {
    left: -100%;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: var(--secondary-gradient);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 147, 251, 0.3);
}

.btn-success {
    background: var(--success-gradient);
    color: white;
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 172, 254, 0.3);
}

.btn-copy {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    min-height: auto;
    border-radius: 8px;
}

.btn-copy:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

/* 按钮组样式 */
.button-group {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.button-group .btn {
    flex: 1;
    min-width: 140px;
}

/* 文本加密布局样式 */
.text-encryption-layout {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* 步骤指示器样式 */
.steps-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: rgba(102, 126, 234, 0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: var(--transition);
}

.step.active {
    opacity: 1;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
}

.step.active .step-number {
    background: var(--primary-gradient);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.step-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
}

.step.active .step-label {
    color: var(--primary-color);
}

.step-divider {
    width: 60px;
    height: 2px;
    background: var(--border-color);
    margin: 0 1rem;
}

/* 输入提示样式 */
.input-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    padding: 0.75rem;
    background: rgba(102, 126, 234, 0.05);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary-color);
}

.input-hint i {
    color: var(--primary-color);
}

/* 密码操作区域 */
.password-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: flex-end;
}

/* 操作区域样式 */
.operation-section {
    margin-top: 1rem;
}

.operation-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.operation-card {
    position: relative;
    overflow: hidden;
}

.operation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.encrypt-card::before {
    background: var(--primary-gradient);
}

.decrypt-card::before {
    background: var(--success-gradient);
}

.operation-card .card-header {
    text-align: center;
    padding: 2rem 1.5rem 1rem;
}

.operation-card .card-header h2 {
    margin-bottom: 0.5rem;
}

.operation-card .card-header p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* 大按钮样式 */
.btn-large {
    width: 100%;
    padding: 1.25rem 2rem;
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

/* 轮廓按钮样式 */
.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

/* 结果组样式 */
.result-group {
    margin: 1.5rem 0;
}

.result-container {
    position: relative;
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
}

.result-container textarea {
    flex: 1;
    background: rgba(14, 52, 96, 0.3);
    border-color: var(--border-color);
}

.result-container .btn-copy {
    margin-top: 0;
    align-self: flex-start;
}

/* 文件上传区域 */
.file-upload-area {
    margin-bottom: 1.5rem;
}

.file-upload-display {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(14, 52, 96, 0.2);
}

.file-upload-display:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.file-upload-display i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.file-upload-display p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.file-info {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.file-size-warning {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 206, 84, 0.1);
    border: 1px solid rgba(255, 206, 84, 0.2);
    border-radius: var(--border-radius);
}

.file-size-warning i {
    color: #ffce54;
}

/* 图片卡片特殊样式 */
.image-card-body {
    text-align: center;
}

.image-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-container img {
    max-width: 100%;
    max-height: 500px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    cursor: pointer;
}

.image-container img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

/* 错误消息样式 */
.error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 154, 158, 0.1);
    border: 1px solid rgba(255, 154, 158, 0.2);
    border-radius: var(--border-radius);
    display: none;
}

.error-message.show {
    display: block;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 弹窗样式 */
.popup {
    position: fixed;
    bottom: -100%;
    right: 2rem;
    width: 300px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
    z-index: 1001;
    overflow: hidden;
}

.popup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
}

.popup.show {
    bottom: 2rem;
    animation: slideUp 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes slideUp {
    from {
        bottom: -100%;
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        bottom: 2rem;
        transform: scale(1);
        opacity: 1;
    }
}

.popup img {
    width: 100%;
    display: block;
}

.close-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 1;
}

.close-btn:hover {
    background: var(--danger-color);
    transform: scale(1.1);
}

/* 加载动画 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 15, 35, 0.9);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.loading-spinner p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
    }
    
    .nav-container {
        height: 60px;
    }
    
    .nav-logo {
        font-size: 1.25rem;
    }
    
    .nav-logo i {
        font-size: 1.5rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-link {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .nav-link span {
        display: none;
    }
    
    .main-content {
        margin-top: 60px;
        padding: 1rem;
    }
    
    .section-header h1 {
        font-size: 2rem;
    }
    
    .section-header p {
        font-size: 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .button-group .btn {
        flex: none;
        width: 100%;
    }
    
    .result-container {
        flex-direction: column;
    }
    
    .result-container .btn-copy {
        align-self: center;
        width: auto;
    }
    
    .popup {
        right: 1rem;
        width: calc(100% - 2rem);
        max-width: 300px;
    }
    
    .popup.show {
        bottom: 1rem;
    }
    
    /* 文本加密布局响应式 */
    .text-encryption-layout {
        gap: 1.5rem;
    }
    
    .steps-indicator {
        padding: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .step-number {
        width: 35px;
        height: 35px;
        font-size: 0.875rem;
    }
    
    .step-label {
        font-size: 0.75rem;
    }
    
    .step-divider {
        width: 40px;
        margin: 0 0.5rem;
    }
    
    .operation-cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .operation-card .card-header {
        padding: 1.5rem 1rem 0.75rem;
    }
    
    .btn-large {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        gap: 0.5rem;
    }
    
    .nav-link {
        padding: 0.5rem;
    }
    
    .section-header {
        margin-bottom: 2rem;
    }
    
    .section-header h1 {
        font-size: 1.75rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .file-upload-display {
        padding: 2rem 1rem;
    }
    
    .file-upload-display i {
        font-size: 2rem;
    }
}

/* 深色模式优化 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0a0a0f;
        --bg-secondary: #151529;
        --bg-card: #1a1a2e;
        --bg-input: #0e3460;
    }
}

/* 动画性能优化 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .popup,
    .loading-overlay {
        display: none !important;
    }
    
    .main-content {
        margin-top: 0;
    }
    
    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}