/**
 * 加密聊天室 - 全局样式表
 * 版本：1.0.0
 * 适用于：index.php, join.php, chat.php 等所有页面
 * 设计风格：暗色主题 + 毛玻璃效果 + 渐变色彩
 */

/* ==================== CSS 变量定义 ==================== */
:root {
    /* 主色调 */
    --primary-color: #00b4d8;
    --primary-hover: #0096c7;
    --primary-dark: #0077b6;
    --primary-light: #4db8ff;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #00b4d8, #0077b6);
    --gradient-secondary: linear-gradient(135deg, #6c757d, #495057);
    --gradient-success: linear-gradient(135deg, #28a745, #20c997);
    --gradient-danger: linear-gradient(135deg, #dc3545, #c82333);
    --gradient-warning: linear-gradient(135deg, #ffc107, #e0a800);
    
    /* 背景色 */
    --bg-primary: #0d1b2a;
    --bg-secondary: #1b2838;
    --bg-tertiary: rgba(10, 25, 40, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.06);
    --bg-glass-hover: rgba(255, 255, 255, 0.1);
    
    /* 文字颜色 */
    --text-primary: #e0f0ff;
    --text-secondary: #8aaec9;
    --text-muted: #6c8a9e;
    --text-white: #ffffff;
    
    /* 边框颜色 */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-light: rgba(255, 255, 255, 0.15);
    --border-color-primary: rgba(77, 184, 255, 0.3);
    
    /* 阴影 */
    --shadow-sm: 0 5px 15px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 25px 50px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 30px 55px rgba(0, 0, 0, 0.6);
    --shadow-primary: 0 10px 25px rgba(0, 180, 216, 0.35);
    --shadow-primary-lg: 0 12px 28px rgba(0, 180, 216, 0.4);
    
    /* 圆角 */
    --radius-sm: 0.4rem;
    --radius-md: 0.7rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    
    /* 间距 */
    --spacing-xs: 0.3rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.8rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 2.5rem;
    
    /* 字体 */
    --font-primary: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', 'Consolas', monospace;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.3s ease;
}

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

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

body {
    font-family: var(--font-primary);
    background: linear-gradient(145deg, #0d1b2a 0%, #1b2838 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 容器样式 ==================== */
.container {
    max-width: 620px;
    width: 100%;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-3xl) var(--spacing-2xl);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 标题样式 ==================== */
h1 {
    color: var(--text-primary);
    text-align: center;
    font-weight: 700;
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.5px;
}

h2 {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

h3 {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: var(--spacing-xl);
}

label {
    display: block;
    color: #c5d9ed;
    margin-bottom: 0.6rem;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.3px;
}

.label-with-icon {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.9rem 1.2rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius-lg);
    color: var(--text-white);
    font-size: 1rem;
    transition: all var(--transition-normal);
    outline: none;
    font-family: var(--font-mono);
}

textarea {
    resize: vertical;
    min-height: 90px;
    line-height: 1.5;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

input::placeholder,
textarea::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

input:focus,
textarea:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(77, 184, 255, 0.2);
    background: rgba(15, 30, 45, 0.85);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    width: 100%;
    padding: 1rem;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-slow);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    text-align: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    background: linear-gradient(135deg, #0096c7, #023e8a);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary-lg);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-primary);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

.btn-secondary:hover {
    background: linear-gradient(135deg, #5a636a, #3a4047);
}

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

.btn-danger {
    background: var(--gradient-danger);
}

.btn-warning {
    background: var(--gradient-warning);
    color: #333;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-lg {
    padding: 1.2rem;
    font-size: 1.2rem;
}

/* ==================== 消息提示 ==================== */
.alert {
    padding: 1rem 1.2rem;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.5;
    animation: slideDown 0.3s ease;
}

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

.alert-error {
    background: rgba(220, 53, 70, 0.15);
    border: 1px solid rgba(220, 53, 70, 0.35);
    color: #ffb3b3;
}

.alert-success {
    background: rgba(40, 167, 69, 0.15);
    border: 1px solid rgba(40, 167, 69, 0.35);
    color: #b3ffcc;
}

.alert-info {
    background: rgba(77, 184, 255, 0.15);
    border: 1px solid rgba(77, 184, 255, 0.35);
    color: #b3d9ff;
}

.alert-warning {
    background: rgba(255, 193, 7, 0.15);
    border: 1px solid rgba(255, 193, 7, 0.35);
    color: #ffe69c;
}

/* ==================== 结果展示区域 ==================== */
.result-section {
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-xl);
}

.result-title {
    color: var(--primary-light);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
    text-align: center;
}

.result-item {
    margin-bottom: 1.2rem;
}

.result-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    word-break: break-all;
    background: rgba(0, 0, 0, 0.4);
    padding: 0.8rem;
    border-radius: var(--radius-md);
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    line-height: 1.5;
    white-space: pre-wrap;
}

.result-value.private-key {
    max-height: 200px;
    background: rgba(180, 0, 0, 0.15);
    border-color: rgba(255, 100, 100, 0.3);
}

/* ==================== 复制按钮 ==================== */
.copy-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(77, 184, 255, 0.2);
    border: 1px solid rgba(77, 184, 255, 0.5);
    color: var(--primary-light);
    padding: var(--spacing-xs) 0.7rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.75rem;
    transition: all var(--transition-fast);
    font-weight: 600;
    z-index: 10;
}

.copy-btn:hover {
    background: rgba(77, 184, 255, 0.35);
    color: var(--text-white);
}

.copy-btn.copied {
    background: rgba(40, 167, 69, 0.3);
    border-color: rgba(40, 167, 69, 0.6);
    color: #b3ffcc;
}

/* ==================== 警告框 ==================== */
.warning-box {
    margin-top: 1.2rem;
    padding: var(--spacing-lg);
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    border-radius: var(--radius-md);
    text-align: center;
}

.warning-box p {
    color: #ffe69c;
    font-weight: 600;
    font-size: 0.9rem;
    margin: 0;
}

.warning-box small {
    color: #ccc;
    font-weight: 400;
    display: block;
    margin-top: var(--spacing-xs);
}

/* ==================== 导航链接 ==================== */
.nav-link {
    text-align: center;
    margin-top: 1.8rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.nav-link a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.nav-link a:hover {
    color: #80c8ff;
    text-decoration: underline;
}

/* ==================== 分隔线 ==================== */
.divider {
    text-align: center;
    margin: var(--spacing-xl) 0;
    color: rgba(255, 255, 255, 0.3);
    position: relative;
    font-size: 0.9rem;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 35%;
    height: 1px;
    background: rgba(255, 255, 255, 0.15);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

/* ==================== 帮助文本 ==================== */
.help-text {
    color: #7a9bb5;
    font-size: 0.8rem;
    margin-top: var(--spacing-xs);
    line-height: 1.5;
}

.help-text code {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.1rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: var(--font-mono);
}

/* ==================== 加载动画 ==================== */
.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--text-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-right: var(--spacing-sm);
    vertical-align: middle;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-content {
    text-align: center;
    color: var(--text-white);
}

.loading-content .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-light);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

/* ==================== Toast提示 ==================== */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    color: var(--text-white);
    padding: 0.8rem 1.5rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 9999;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInOut 2.5s ease;
    pointer-events: none;
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    15% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    85% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
}

/* ==================== 成功动画 ==================== */
.success-animation {
    text-align: center;
    padding: var(--spacing-lg);
}

.checkmark {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
}

.checkmark-circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 2;
    stroke-miterlimit: 10;
    stroke: var(--primary-light);
    fill: none;
    animation: stroke 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark-check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    stroke: var(--primary-light);
    animation: stroke 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke {
    100% {
        stroke-dashoffset: 0;
    }
}

/* ==================== 聊天室特有样式 ==================== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-height: 800px;
}

.chat-header {
    padding: var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.message {
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.message-content {
    background: rgba(255, 255, 255, 0.08);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    max-width: 70%;
}

.message-encrypted {
    background: rgba(0, 180, 216, 0.1);
    border: 1px solid rgba(0, 180, 216, 0.2);
}

.chat-input {
    padding: var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
}

.chat-input input {
    flex: 1;
}

.chat-input .btn {
    width: auto;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 1.8rem 1.2rem;
        border-radius: var(--radius-xl);
    }
    
    h1 {
        font-size: 1.6rem;
    }
    
    .result-value {
        font-size: 0.7rem;
        padding: 0.6rem;
    }
    
    .message-content {
        max-width: 85%;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    body {
        padding: 10px;
    }
    
    .container {
        padding: 1.5rem 1rem;
        border-radius: var(--radius-lg);
    }
    
    h1 {
        font-size: 1.4rem;
    }
    
    .btn {
        padding: 0.8rem;
        font-size: 1rem;
    }
    
    textarea {
        min-height: 100px;
        font-size: 0.8rem;
    }
    
    .result-value {
        font-size: 0.65rem;
        max-height: 100px;
    }
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Firefox 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) rgba(255, 255, 255, 0.05);
}

/* ==================== 辅助类 ==================== */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

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

.text-primary {
    color: var(--primary-light);
}

.text-success {
    color: #b3ffcc;
}

.text-error {
    color: #ffb3b3;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }
.mt-4 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }
.mb-4 { margin-bottom: var(--spacing-2xl); }

.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-lg); }
.p-3 { padding: var(--spacing-xl); }
.p-4 { padding: var(--spacing-2xl); }

.d-none {
    display: none;
}

.d-flex {
    display: flex;
}

.align-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-lg); }

.flex-1 {
    flex: 1;
}

.word-break {
    word-break: break-all;
}

.text-mono {
    font-family: var(--font-mono);
}

.relative {
    position: relative;
}

/* ==================== 打印样式 ==================== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .container {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .btn,
    .copy-btn {
        display: none;
    }
}