/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #5B9FED;
    --secondary-color: #6c757d;
    --success-color: #10B981;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --bg-dark: #0F1419;
    --bg-card: #1A1F2E;
    --bg-input: #252B3B;
    --text-primary: #E5E7EB;
    --text-secondary: #9CA3AF;
    --border-color: #2D3748;
    --shadow: 0 4px 6px rgba(0,0,0,0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-icon {
    color: var(--success-color);
    display: flex;
    align-items: center;
}

.nav-brand-link {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-brand-link:hover {
    color: #7BB4F5;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-input);
}

.nav-right {
    display: flex;
    align-items: center;
}

.nav-section {
    display: flex;
    align-items: center;
}

.btn-login {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 24px;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-login:hover {
    background-color: var(--bg-input);
    border-color: var(--text-secondary);
}

/* 用户下拉菜单 */
.user-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.dropdown-toggle:hover {
    background-color: var(--bg-card);
    border-color: var(--text-secondary);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    min-width: 220px;
    z-index: 1001;
    overflow: hidden;
}

.dropdown-user-info {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.dropdown-email {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.dropdown-balance {
    background-color: var(--success-color);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.85rem;
    display: inline-block;
    width: fit-content;
}

.dropdown-item {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.2s;
    font-size: 0.9rem;
}

.dropdown-item:hover {
    background-color: var(--bg-input);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 4px 0;
}

/* 主内容区 */
.main-content {
    padding: 60px 0;
    min-height: calc(100vh - 120px);
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 60px;
}

.hero-title-box {
    background-color: var(--text-primary);
    display: inline-block;
    padding: 20px 60px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

/* 登录提示 */
.login-prompt {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 0;
}

.prompt-card {
    background-color: var(--bg-card);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    max-width: 400px;
}

.prompt-card h2 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.prompt-card p {
    margin-bottom: 25px;
    color: var(--text-secondary);
}

/* 工具界面 */
.tool-interface {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Model Card */
.model-card {
    background-color: var(--bg-card);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.model-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.model-icon {
    width: 32px;
    height: 32px;
    background-color: var(--success-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.model-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.model-select-wrapper {
    position: relative;
}

.model-select {
    width: 100%;
    padding: 14px 40px 14px 16px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    transition: all 0.2s;
}

.model-select:hover {
    border-color: var(--text-secondary);
}

.model-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.model-select-wrapper::after {
    content: '▼';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    font-size: 0.8rem;
}

/* Input Card */
.input-card {
    background-color: var(--bg-card);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.input-label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.input-textarea {
    width: 100%;
    padding: 14px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    transition: all 0.2s;
}

.input-textarea:hover {
    border-color: var(--text-secondary);
}

.input-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-textarea::placeholder {
    color: var(--text-secondary);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 12px;
}

/* Result Card */
.result-card {
    background-color: var(--bg-card);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-top: 24px;
}

.result-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.result-content {
    background-color: var(--bg-input);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-family: monospace;
    color: var(--text-secondary);
    line-height: 1.6;
}

.result-stats {
    display: flex;
    gap: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.result-stat {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.result-stat strong {
    color: var(--text-primary);
}

/* 按钮 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-large {
    padding: 14px 32px;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #4A8FDB;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-card);
    border-color: var(--text-secondary);
}

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

/* 页脚 */
.footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 15px 20px;
        gap: 12px;
    }

    .nav-center {
        gap: 15px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-title-box {
        padding: 15px 40px;
    }

    .hero-subtitle {
        font-size: 1rem;
        padding: 0 20px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .result-stats {
        flex-direction: column;
        gap: 12px;
    }
}

/* 动画效果 */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

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

.result-card {
    animation: fadeIn 0.3s ease-out;
}