/* CSS 變數定義 */
:root {
    /* 主要色彩 */
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #4a6fa5;
    --background-color: #1a2332;
    
    /* 漸變色彩 */
    --primary-gradient: linear-gradient(135deg, #1e3a5f 0%, #2c3e50 100%);
    --secondary-gradient: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    --accent-gradient: linear-gradient(135deg, #34495e 0%, #4a6fa5 100%);
    --background-gradient: linear-gradient(135deg, #1a2332 0%, #1e3a5f 100%);
    --card-header-gradient: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    
    /* 文字色彩 */
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-muted: #8892b0;
    
    /* 背景色彩 */
    --bg-card: rgba(255, 255, 255, 0.15);
    --bg-card-hover: rgba(255, 255, 255, 0.2);
    --bg-input: rgba(255, 255, 255, 0.1);
    
    /* 陰影 */
    --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);
    
    /* 邊距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 邊角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 動畫 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

/* 基礎樣式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景動畫 */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.floating-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(44, 62, 80, 0.1), rgba(74, 111, 165, 0.1));
    animation: float 20s infinite linear;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 10%;
    animation-delay: -5s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 80%;
    left: 20%;
    animation-delay: -10s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 30%;
    right: 30%;
    animation-delay: -15s;
}

.shape-5 {
    width: 140px;
    height: 140px;
    top: 10%;
    left: 60%;
    animation-delay: -7s;
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 0.3;
    }
    100% {
        transform: translateY(0px) rotate(360deg);
        opacity: 0.7;
    }
}

/* 主容器 */
.main-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* 標題區域 */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.header-content {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 0, 0, 0.3);
}

.header-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #aaaaaa 0%, #cccccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #aaaaaa 0%, #cccccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* 卡片樣式 */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 0, 0, 0.3);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    background: var(--card-header-gradient);
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-header i {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.card-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: var(--spacing-lg);
}

/* 更新通知 */
.update-notice {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.2), rgba(52, 73, 94, 0.2));
    border: 1px solid rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.update-notice i {
    color: #999999;
    font-size: 1.1rem;
}

/* 輸入區域 */
.input-section {
    margin-bottom: var(--spacing-lg);
}

.input-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.input-field {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: 3rem;
    background: var(--bg-input);
    border: 2px solid rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.input-field:focus {
    outline: none;
    border-color: #1a1a1a;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.2);
}

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

.input-icon {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.input-field:focus + .input-icon {
    color: #1a1a1a;
}

.example-text {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.4;
}

.example-text i {
    color: #999999;
    margin-top: 2px;
    flex-shrink: 0;
}

/* 狀態顯示 */
.status-display {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-normal);
}

.status-display.info {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.2), rgba(52, 73, 94, 0.2));
    border: 1px solid rgba(0, 0, 0, 0.4);
    color: #b8c5d6;
}

.status-display.error {
    background: linear-gradient(135deg, rgba(52, 73, 94, 0.2), rgba(74, 111, 165, 0.2));
    border: 1px solid rgba(0, 0, 0, 0.4);
    color: #ffffff;
}

/* 按鈕樣式 */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-width: 160px;
    justify-content: center;
    text-decoration: none;
}

.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: left var(--transition-slow);
}

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

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-accent {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn small {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-left: var(--spacing-xs);
}

/* 結果顯示 */
.result-content {
    background: var(--bg-input);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid rgba(0, 0, 0, 0.3);
    font-family: 'Courier New', monospace;
    line-height: 1.8;
    white-space: pre-wrap;
}

/* 教學容器 */
.tutorial-container {
    text-align: center;
}

.tutorial-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.tutorial-container img:hover {
    transform: scale(1.02);
}

/* 頁腳 */
.footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 0, 0, 0.3);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-section {
    text-align: center;
}

.copyright {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.tech-info {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.contact-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
}

.contact-info a {
    color: #aaaaaa;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-info a:hover {
    color: #cccccc;
}

/* 模態框樣式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    animation: fadeIn var(--transition-normal);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 0, 0, 0.3);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideDown var(--transition-normal);
}

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

.modal-header h2 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-input-group {
    margin-bottom: var(--spacing-md);
}

.modal-input-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-weight: 500;
}

.modal-input {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-input);
    border: 1px solid rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
}

/* 訂閱狀態顯示 */
.subscription-status {
    background: var(--bg-input);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(0, 0, 0, 0.3);
}

.status-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

.numbers-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.number-group {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.number-group-label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.number-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.number-item {
    background: var(--accent-color);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 28px;
    text-align: center;
}

.subscription-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    display: none;
}

.subscription-message.success {
    background: rgba(40, 167, 69, 0.2);
    border: 1px solid rgba(40, 167, 69, 0.5);
    color: #28a745;
    display: block;
}

.subscription-message.error {
    background: rgba(220, 53, 69, 0.2);
    border: 1px solid rgba(220, 53, 69, 0.5);
    color: #dc3545;
    display: block;
}

.subscription-message.info {
    background: rgba(0, 123, 255, 0.2);
    border: 1px solid rgba(0, 123, 255, 0.5);
    color: #007bff;
    display: block;
}

/* 動畫 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .main-container {
        padding: var(--spacing-md);
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .button-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        min-width: auto;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .example-text {
        font-size: 0.8rem;
    }
    
    .result-content {
        font-size: 0.8rem;
        line-height: 1.6;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: var(--spacing-lg);
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .input-field {
        padding: var(--spacing-sm);
        padding-right: 2.5rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
}

/* 載入動畫 */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s infinite;
}

/* 成功/錯誤狀態 */
.success {
    color: #888888;
}

.error {
    color: #666666;
}

.warning {
    color: #777777;
}

/* 滾動條樣式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #555555, #666666);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #666666, #777777);
}