/* CSS Variables for theming */
:root {
    --primary-color: #ff6b6b;
    --secondary-color: #4ecdc4;
    --accent-color: #ffe66d;
    --dark-bg: #2c3e50;
    --light-bg: #ecf0f1;
    --text-dark: #2c3e50;
    --text-light: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #ee5a6f 100%);
    color: var(--text-light);
    padding: 30px;
    box-shadow: var(--box-shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

header h1 {
    font-size: 2.5em;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 10px;
}

.lang-btn {
    padding: 10px 20px;
    border: 2px solid var(--text-light);
    background-color: transparent;
    color: var(--text-light);
    cursor: pointer;
    border-radius: var(--border-radius);
    font-size: 1em;
    font-weight: 600;
    transition: var(--transition);
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.lang-btn.active {
    background-color: var(--text-light);
    color: var(--primary-color);
}

/* Main Content */
main {
    padding: 40px;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeIn 0.5s ease-in;
}

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

/* Sections */
section {
    margin-bottom: 50px;
}

section h2 {
    font-size: 2em;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--accent-color);
}

section h3 {
    font-size: 1.5em;
    color: var(--secondary-color);
    margin-top: 20px;
    margin-bottom: 15px;
}

section p {
    margin-bottom: 15px;
    line-height: 1.8;
}

/* Info Box */
.info-box {
    background-color: #fff;
    border-left: 5px solid var(--secondary-color);
    padding: 20px;
    margin: 20px 0;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.info-box h3 {
    margin-top: 0;
    color: var(--secondary-color);
}

/* Point Method Cards */
.point-method {
    background-color: #fff;
    padding: 25px;
    margin: 20px 0;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.point-method:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.point-method h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.point-method.warning {
    border-left: 5px solid #ff9800;
    background-color: #fff3e0;
}

.point-method.warning h3 {
    color: #ff9800;
}

.point-method .note {
    margin-top: 15px;
    padding: 10px 15px;
    background-color: rgba(78, 205, 196, 0.1);
    border-left: 3px solid var(--secondary-color);
    border-radius: 4px;
    font-style: italic;
}

.point-method ul {
    margin-left: 20px;
}

/* Lists */
ul, ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

ul li, ol li {
    margin-bottom: 10px;
}

.flow-list {
    counter-reset: step-counter;
    list-style: none;
    margin-left: 0;
}

.flow-list li {
    counter-increment: step-counter;
    margin-bottom: 30px;
    padding-left: 60px;
    position: relative;
}

.flow-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2em;
    box-shadow: var(--box-shadow);
}

.flow-list li strong {
    display: block;
    font-size: 1.2em;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.flow-list li p {
    margin-bottom: 10px;
}

.flow-list li ul {
    margin-top: 10px;
}

.tips-list {
    list-style: none;
    margin-left: 0;
}

.tips-list li {
    background-color: #fff;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.tips-list li:hover {
    transform: translateX(10px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background-color: #fff;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

table thead {
    background: linear-gradient(135deg, var(--secondary-color), #45b7af);
    color: var(--text-light);
}

table thead th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

table tbody tr {
    border-bottom: 1px solid #ddd;
    transition: var(--transition);
}

table tbody tr:hover {
    background-color: rgba(78, 205, 196, 0.1);
}

table tbody td {
    padding: 15px;
}

table tbody tr:last-child {
    border-bottom: none;
}

/* Code */
code {
    background-color: #f4f4f4;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    color: var(--primary-color);
    font-weight: 600;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: var(--text-light);
    text-align: center;
    padding: 30px;
}

footer p {
    margin: 10px 0;
}

.github-link a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.github-link a:hover {
    color: var(--text-light);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2em;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    main {
        padding: 20px;
    }

    section h2 {
        font-size: 1.5em;
    }

    section h3 {
        font-size: 1.2em;
    }

    .flow-list li {
        padding-left: 50px;
    }

    .flow-list li::before {
        width: 35px;
        height: 35px;
        font-size: 1em;
    }

    table {
        font-size: 0.9em;
    }

    table thead th,
    table tbody td {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5em;
    }

    .lang-btn {
        padding: 8px 15px;
        font-size: 0.9em;
    }

    main {
        padding: 15px;
    }

    section h2 {
        font-size: 1.3em;
    }

    .point-method {
        padding: 15px;
    }

    table {
        font-size: 0.8em;
    }

    table thead th,
    table tbody td {
        padding: 8px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        box-shadow: none;
    }

    .language-switcher {
        display: none;
    }

    .point-method,
    .info-box,
    .tips-list li,
    table {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .content-section {
        display: block !important;
    }

    #content-en {
        page-break-before: always;
    }
}