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

/* Theme Variables */
:root {
    --bg-primary: #f5f5f5;
    --bg-card: #ffffff;
    --bg-step: #f8f9fa;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-secondary-hover: #5d3a7a;
    --accent-hover: #5568d3;
    --border-color: #dddddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --nav-bg: #ffffff;
    --nav-hover: #f0f0f0;
    --bg-hover: #f5f5f5;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --code-bg: #f4f4f4;
    --code-border: #ddd;
    --code-block-bg: #2d2d2d;
    --code-block-text: #f8f8f2;
    --info-bg: #e3f2fd;
    --info-border: #2196f3;
    --warning-bg: #fff3cd;
    --warning-border: #ffc107;
    --warning-text: #856404;
    --success-bg: #e8f5e9;
    --success-border: #4caf50;
    --faq-item-bg: #f8f9fa;
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-card: #16213e;
    --bg-step: #1e2a4a;
    --text-primary: #f0f0f0;
    --text-secondary: #c8c8c8;
    --text-muted: #a0a0a0;
    --accent-primary: #8a9cf0;
    --accent-secondary: #a87dd0;
    --accent-secondary-hover: #7a5a9a;
    --accent-hover: #9fb0ff;
    --border-color: #3d4a6a;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --nav-bg: #16213e;
    --nav-hover: #253352;
    --bg-hover: #1e2a4a;
    --gradient-start: #5a6fd1;
    --gradient-end: #7b5daa;
    --code-bg: #1e2a4a;
    --code-border: #4a5a7a;
    --code-block-bg: #1a1a2e;
    --code-block-text: #e0e0e0;
    --info-bg: #1a3a5c;
    --info-border: #4a90d9;
    --warning-bg: #3d3520;
    --warning-border: #d4a017;
    --warning-text: #f5d67a;
    --success-bg: #1a3d1a;
    --success-border: #6abf6a;
    --faq-item-bg: #1e2a4a;
}

/* Base styles with theme support */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Navigation */
nav {
    background: var(--nav-bg);
    box-shadow: 0 2px 5px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    margin-bottom: 40px;
    transition: background-color 0.3s ease;
}

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

.nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    gap: 20px;
}

.nav-menu {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    flex-wrap: nowrap;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 5px;
    flex: 1;
}

.nav-menu li {
    margin: 0;
    white-space: nowrap;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 5px;
    transition: background 0.3s ease, color 0.3s ease;
    font-weight: 500;
    display: block;
    white-space: nowrap;
    font-size: 0.95em;
}

.nav-menu a:hover {
    background: var(--nav-hover);
}

.nav-menu a.active {
    background: var(--accent-primary);
    color: white;
}

.nav-logo {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    flex-shrink: 0;
    text-decoration: none;
}

.nav-logo img {
    width: 24px;
    height: 24px;
    vertical-align: middle;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: var(--accent-primary);
    padding: 5px 10px;
}

.menu-toggle:hover {
    color: var(--accent-hover);
}

/* Theme toggle button */
.theme-toggle {
    background: none;
    border: none;
    font-size: 1.3em;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 5px;
    transition: background 0.3s ease;
    color: var(--text-primary);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--nav-hover);
}

.menu-toggle {
    color: var(--accent-primary);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
}

/* Cards */
.feature-card,
.category-card,
.stats,
.cta,
.content-section,
.faq-item,
.info-box {
    background: var(--bg-card);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s ease;
}

.feature-card h3,
.category-card h3 {
    color: var(--accent-primary);
}

.feature-card p,
.category-card li {
    color: var(--text-secondary);
}

.category-card {
    border-left-color: var(--accent-primary);
}

.category-card li:before {
    color: var(--accent-primary);
}

/* Stats */
.stat-number {
    color: var(--accent-primary);
}

.stat-label {
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    background: var(--accent-primary);
    transition: background 0.3s ease;
}

.btn:hover {
    background: var(--accent-hover);
}

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

[data-theme="dark"] .btn-secondary:hover {
    background: #7a5a9a;
}

/* Footer */
footer {
    color: var(--text-secondary);
    border-top-color: var(--border-color);
}

footer a {
    color: var(--accent-primary);
}

/* Code blocks */
pre, code {
    background: var(--code-bg);
    border-color: var(--code-border);
    color: var(--text-primary);
}

code.inline-code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 3px;
}

/* Table header border */
th.accent-border {
    border-bottom: 2px solid var(--accent-primary);
}

/* Tables */
table {
    border-color: var(--border-color);
}

th {
    background: var(--nav-hover);
    color: var(--text-primary);
}

td {
    border-color: var(--border-color);
    color: var(--text-secondary);
}

/* Content sections */
.content-section h2 {
    color: var(--accent-primary);
}

.content-section h3 {
    color: var(--text-primary);
}

/* FAQ items */
.faq-item h3 {
    color: var(--accent-primary);
}

.faq-item p {
    color: var(--text-secondary);
}

/* Info boxes */
.info-box {
    background: var(--info-bg);
    border-left: 4px solid var(--info-border);
    color: var(--text-primary);
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
}

.warning-box {
    background: var(--warning-bg);
    border-left: 4px solid var(--warning-border);
    color: var(--warning-text);
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 5px 5px 0;
}

.warning-box strong,
.note strong {
    color: var(--warning-text);
}

/* Note box (alias for warning) */
.note {
    background: var(--warning-bg);
    border-left: 4px solid var(--warning-border);
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 5px 5px 0;
}

.success-box {
    background: var(--success-bg);
    border-left: 4px solid var(--success-border);
    color: var(--text-primary);
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
}

/* Page header - common across pages */
.page-header {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

/* Section - common across pages */
.section {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow-color);
    margin-bottom: 30px;
}

.section h2 {
    color: var(--accent-primary);
    margin-bottom: 20px;
    font-size: 1.8em;
    border-bottom: 3px solid var(--accent-primary);
    padding-bottom: 10px;
}

.section h3 {
    color: var(--accent-secondary);
    margin-top: 25px;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.section p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

/* Step containers */
.step {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-step);
    border-left: 4px solid var(--accent-primary);
    border-radius: 5px;
}

.step-number {
    display: inline-block;
    background: var(--accent-primary);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    text-align: center;
    line-height: 30px;
    font-weight: bold;
    margin-right: 15px;
}

/* Code blocks */
.code-wrapper {
    position: relative;
    margin: 15px 0;
}

.code-block {
    background: var(--code-block-bg);
    color: var(--code-block-text);
    padding: 20px;
    padding-right: 100px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 15px 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
    display: block;
}

.code-wrapper .code-block {
    margin: 0;
}

.code-block code {
    color: var(--code-block-text);
}

.copy-button {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.85em;
    transition: background 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
    z-index: 10;
}

.copy-button:hover {
    background: var(--accent-hover);
}

.copy-button:active {
    background: var(--accent-hover);
}

.copy-button.copied {
    background: var(--success-border);
}

/* Tool items */
.tool-item h4 {
    color: var(--accent-primary);
}

.tool-item p {
    color: var(--text-secondary);
}

/* Anchor links */
a {
    color: var(--accent-primary);
}

a:hover {
    color: var(--accent-hover);
}

/* Page titles */
.page-title {
    color: var(--text-primary);
}

.page-subtitle {
    color: var(--text-secondary);
}

/* Footer specific */
.footer-links a {
    color: var(--accent-primary);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--accent-hover);
}

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

/* Hint/Note text */
.hint-text {
    color: var(--text-secondary);
}

/* Small text */
.small-hint {
    color: var(--text-secondary);
}

/* Success link styling */
.success-box a {
    color: var(--success-border);
    font-weight: bold;
}

.success-box a:hover {
    color: var(--accent-hover);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    margin-bottom: 40px;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

footer a {
    color: var(--accent-primary);
}

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

/* Medium screen optimization */
@media (max-width: 1024px) and (min-width: 769px) {
    .nav-menu a {
        padding: 8px 10px;
        font-size: 0.9em;
    }

    .nav-logo {
        font-size: 1.1em;
    }

    .nav-menu {
        gap: 3px;
    }

    .nav-header {
        gap: 15px;
    }
}

/* Responsive Design - Mobile */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header {
        padding: 40px 15px;
    }

    .nav-container {
        padding: 0 15px;
    }

    .nav-header {
        padding: 10px 0;
        flex-wrap: wrap;
    }

    .menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        padding: 10px 0;
        width: 100%;
        order: 3;
        flex: 1 1 100%;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
        margin: 5px 0;
    }

    .nav-menu a {
        display: block;
        width: 100%;
        padding: 12px 16px;
    }

    .nav-logo {
        flex: 1;
        font-size: 1.1em;
    }

    footer {
        padding: 30px 15px;
        font-size: 0.9em;
    }

    .info-box, .warning-box, .success-box, .note {
        padding: 12px;
        margin: 10px 0;
    }

    /* Page header RWD */
    .page-header {
        padding: 30px 15px;
        margin-bottom: 30px;
    }

    .page-header h1 {
        font-size: 1.8em;
    }

    /* Section RWD */
    .section {
        padding: 25px 15px;
        margin-bottom: 20px;
    }

    .section h2 {
        font-size: 1.4em;
    }

    .section h3 {
        font-size: 1.1em;
    }

    /* Code wrapper RWD */
    .code-wrapper {
        margin: 10px 0;
        display: flex;
        flex-direction: column;
    }

    .code-block {
        padding: 15px;
        padding-right: 15px;
        font-size: 0.8em;
    }

    .code-wrapper .code-block,
    .code-wrapper pre,
    .code-wrapper pre.code-block {
        order: 1;
        margin: 0;
        border-radius: 5px;
    }

    .code-wrapper .copy-button,
    .copy-button {
        position: static;
        margin-top: 10px;
        width: 100%;
        display: flex;
        justify-content: center;
        order: 2;
    }
}

@media (max-width: 480px) {
    .nav-logo {
        font-size: 1em;
    }

    .nav-logo img {
        width: 20px;
        height: 20px;
    }

    .page-header h1 {
        font-size: 1.5em;
    }

    .code-block {
        font-size: 0.75em;
    }
}