/* 前端用户界面 - 高端玻璃拟态设计 */

/* CSS变量定义 */
:root {
    --primary: #07C160;
    --primary-dark: #06AD56;
    --primary-light: #95EC69;
    --primary-glow: rgba(7, 193, 96, 0.4);
    --text: #1A1A1A;
    --text-secondary: #666666;
    --border: rgba(255, 255, 255, 0.2);
    --card-bg: rgba(255, 255, 255, 0.85);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
    --radius: 20px;
    --radius-lg: 30px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 动态渐变背景 */
body {
    background: linear-gradient(-45deg, #e8f5e9, #c8e6c9, #a5d6a7, #81c784);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    overflow-x: hidden;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 浮动装饰元素 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(7, 193, 96, 0.03) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* 登录/注册容器 */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
}

/* 玻璃拟态卡片 */
.auth-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    padding: 3rem;
    width: 100%;
    max-width: 480px;
    position: relative;
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
    margin: 0 auto;
}

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

/* 卡片光效 */
.auth-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.1) 50%,
        transparent 70%
    );
    animation: shimmer 3s infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

/* Logo区域 */
.auth-logo {
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
}

.auth-logo .icon-wrapper {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: 0 10px 40px var(--primary-glow);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 10px 40px var(--primary-glow); }
    50% { transform: scale(1.05); box-shadow: 0 15px 50px var(--primary-glow); }
}

.auth-logo .icon-wrapper i {
    font-size: 2.5rem;
    color: white;
}

.auth-logo h2 {
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.auth-logo p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 表单样式 */
.form-floating {
    position: relative;
    margin-bottom: 1.5rem;
}

.form-floating i {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: var(--transition);
    z-index: 2;
}

.form-floating .form-control {
    height: 60px;
    padding: 1rem 1rem 1rem 3.5rem;
    border: 2px solid #E8E8E8;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
}

.form-floating .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(7, 193, 96, 0.1);
    background: white;
}

.form-floating .form-control:focus + label,
.form-floating .form-control:not(:placeholder-shown) + label {
    transform: scale(0.85) translateY(-0.5rem) translateX(-0.5rem);
    color: var(--primary);
}

.form-floating .form-control:focus ~ i {
    color: var(--primary);
}

.form-floating label {
    padding-left: 3.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

/* 主按钮 */
.btn-auth {
    width: 100%;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: var(--radius);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(7, 193, 96, 0.3);
    position: relative;
    overflow: hidden;
    margin-top: 1rem;
}

.btn-auth::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: 0.5s;
}

.btn-auth:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(7, 193, 96, 0.4);
}

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

.btn-auth:active {
    transform: translateY(-1px);
}

/* 底部链接 */
.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.auth-footer a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
    margin-left: 0.5rem;
    position: relative;
    transition: var(--transition);
}

.auth-footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.auth-footer a:hover {
    color: var(--primary-dark);
}

.auth-footer a:hover::after {
    width: 100%;
}

/* 导航栏 */
.frontend-navbar {
    background: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    border-bottom: 1px solid rgba(7, 193, 96, 0.1);
    padding: 1rem 0;
}

.frontend-navbar .navbar-brand {
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--primary) !important;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.frontend-navbar .navbar-brand i {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.frontend-navbar .nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.75rem 1.25rem !important;
    border-radius: 10px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.frontend-navbar .nav-link:hover,
.frontend-navbar .nav-link.active {
    color: var(--primary) !important;
    background: rgba(7, 193, 96, 0.08);
}

/* 考试容器 */
.exam-wrapper {
    padding: 2rem 0;
    min-height: calc(100vh - 80px);
}

/* 开始卡片 */
.start-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 4rem 3rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    animation: slideUp 0.6s ease-out;
}

.start-card .icon-wrapper {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: 0 15px 50px var(--primary-glow);
    animation: pulse 2s ease-in-out infinite;
}

.start-card .icon-wrapper i {
    font-size: 3rem;
    color: white;
}

.start-card h3 {
    font-weight: 700;
    font-size: 2rem;
    color: var(--text);
    margin-bottom: 1rem;
}

.start-card p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

.btn-start {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    color: white;
    padding: 1rem 3rem;
    border-radius: var(--radius);
    font-size: 1.2rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
    box-shadow: 0 8px 30px rgba(7, 193, 96, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-start::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: 0.5s;
}

.btn-start:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(7, 193, 96, 0.4);
    color: white;
}

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

/* 答题区域 */
.exam-container {
    max-width: 900px;
    margin: 0 auto;
}

.exam-header {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.progress-section {
    flex: 1;
    min-width: 200px;
}

.progress-text {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.progress {
    height: 10px;
    background: rgba(7, 193, 96, 0.1);
    border-radius: 5px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.countdown-section {
    text-align: center;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, rgba(7, 193, 96, 0.1) 0%, rgba(149, 236, 105, 0.1) 100%);
    border-radius: var(--radius);
    border: 1px solid rgba(7, 193, 96, 0.2);
}

.countdown-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.countdown-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}

/* 题目卡片 */
.question-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

.question-header {
    background: linear-gradient(135deg, rgba(7, 193, 96, 0.05) 0%, rgba(149, 236, 105, 0.05) 100%);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid rgba(7, 193, 96, 0.1);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.question-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    box-shadow: 0 4px 15px rgba(7, 193, 96, 0.3);
}

.question-type {
    background: rgba(7, 193, 96, 0.1);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.question-content {
    padding: 2rem;
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text);
    font-weight: 500;
}

/* 朗读按钮 */
.btn-read {
    background: linear-gradient(135deg, #4CAF50 0%, #66BB6A 100%);
    border: none;
    color: white;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    margin: 0 2rem 2rem;
}

.btn-read:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
    color: white;
}

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

.btn-read i {
    font-size: 1.1rem;
}

/* 答案区域 */
.answer-section {
    padding: 0 2rem 2rem;
}

.answer-section textarea {
    border: 2px solid #E8E8E8;
    border-radius: var(--radius);
    padding: 1.25rem;
    font-size: 1rem;
    resize: vertical;
    min-height: 150px;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
}

.answer-section textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(7, 193, 96, 0.1);
    background: white;
}

/* 录音区域 */
.recording-section {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(7, 193, 96, 0.05) 0%, rgba(149, 236, 105, 0.05) 100%);
    border-radius: var(--radius);
    margin: 0 2rem 2rem;
    border: 1px dashed rgba(7, 193, 96, 0.3);
}

.btn-record {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(7, 193, 96, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
}

.btn-record::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-record:hover::before {
    width: 300px;
    height: 300px;
}

.btn-record:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(7, 193, 96, 0.4);
    color: white;
}

.btn-record.recording {
    background: linear-gradient(135deg, #FA5151 0%, #FF6B6B 100%);
    animation: recordingPulse 1.5s infinite;
}

@keyframes recordingPulse {
    0%, 100% { box-shadow: 0 4px 20px rgba(250, 81, 81, 0.3); }
    50% { box-shadow: 0 4px 30px rgba(250, 81, 81, 0.5); }
}

.record-hint {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: 1rem;
    padding: 0 2rem 2rem;
    flex-wrap: wrap;
}

.btn-exam-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(7, 193, 96, 0.3);
}

.btn-exam-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(7, 193, 96, 0.4);
    color: white;
}

.btn-exam-secondary {
    background: rgba(7, 193, 96, 0.1);
    border: 1px solid rgba(7, 193, 96, 0.3);
    color: var(--primary);
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
}

.btn-exam-secondary:hover {
    background: rgba(7, 193, 96, 0.15);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

/* 完成页面 */
.completion-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 4rem 3rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    animation: slideUp 0.6s ease-out;
}

.completion-card .success-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: 0 10px 40px var(--primary-glow);
    animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
    0% { transform: scale(0); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.completion-card .success-icon i {
    font-size: 3rem;
    color: white;
}

.completion-card h3 {
    font-weight: 700;
    font-size: 2rem;
    color: var(--text);
    margin-bottom: 1rem;
}

.completion-card p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .auth-card {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }
    
    .auth-logo .icon-wrapper {
        width: 70px;
        height: 70px;
    }
    
    .auth-logo h2 {
        font-size: 1.5rem;
    }
    
    .start-card {
        padding: 2.5rem 1.5rem;
        margin: 1rem;
    }
    
    .start-card .icon-wrapper {
        width: 90px;
        height: 90px;
    }
    
    .exam-header {
        padding: 1rem;
    }
    
    .countdown-value {
        font-size: 1.5rem;
    }
    
    .question-content {
        padding: 1.5rem;
        font-size: 1.1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn-exam-primary,
    .btn-exam-secondary {
        width: 100%;
        justify-content: center;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* 提示消息 */
.alert-modern {
    background: rgba(250, 81, 81, 0.1);
    border: 1px solid rgba(250, 81, 81, 0.2);
    color: #FA5151;
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}