/* ==============================================================================
   2Base64.com — Global Stylesheet
   ============================================================================== */

/* --- CSS Variables --- */
:root {
    --font-display: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --color-bg: #0c0f14;
    --color-bg-elevated: #141821;
    --color-bg-card: #1a1f2b;
    --color-bg-input: #111620;
    --color-border: #252d3d;
    --color-border-hover: #3a4560;

    --color-text: #e1e4eb;
    --color-text-secondary: #8891a4;
    --color-text-muted: #5c6478;

    --color-primary: #4f8aff;
    --color-primary-hover: #6d9fff;
    --color-primary-glow: rgba(79, 138, 255, 0.15);
    --color-primary-soft: rgba(79, 138, 255, 0.08);

    --color-accent: #38d9a9;
    --color-accent-glow: rgba(56, 217, 169, 0.12);

    --color-danger: #ff6b6b;
    --color-warning: #ffd43b;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px var(--color-primary-glow);

    --transition: 0.2s ease;
    --transition-slow: 0.4s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-display);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

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

img {
    max-width: 100%;
    height: auto;
}

/* --- Skip Link --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    z-index: 9999;
    padding: 8px 16px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.skip-link:focus {
    top: 16px;
}

/* --- Container --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 800px;
}

/* --- Header --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(12, 15, 20, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    font-family: var(--font-mono);
    font-size: 16px;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(79, 138, 255, 0.2);
}

/* --- Navigation --- */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 4px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    white-space: nowrap;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    left: 0;
    transition: var(--transition);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* --- Language Switcher Combo Box --- */
.lang-switcher {
    flex-shrink: 0;
}

.lang-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0 8px;
    gap: 6px;
    transition: all var(--transition);
    cursor: pointer;
    height: 38px;
}

.lang-select-wrapper:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-elevated);
}

.lang-globe {
    font-size: 16px;
    pointer-events: none;
    flex-shrink: 0;
    line-height: 1;
}

.lang-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background: transparent;
    border: none;
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    padding: 8px 20px 8px 0;
    cursor: pointer;
    outline: none;
    min-width: 100px;
    max-width: 170px;
    line-height: 1.3;
}

.lang-select option {
    background: var(--color-bg-card);
    color: var(--color-text);
    padding: 8px;
    font-size: 14px;
}

.lang-arrow {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 10px;
    color: var(--color-text-muted);
    pointer-events: none;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 12px var(--color-primary-glow);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: #fff;
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-hover);
    color: var(--color-text);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-soft);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-text);
    background: var(--color-primary-soft);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 12px;
}

.btn-full {
    width: 100%;
}

.btn-icon-only {
    width: 44px;
    height: 44px;
    padding: 0;
    font-size: 18px;
}

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

.btn-copy:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-copy.copied {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-glow);
}

/* --- Hero Section --- */
.hero {
    padding: 80px 0 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(ellipse, var(--color-primary-glow) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    border: 1px solid rgba(79, 138, 255, 0.2);
    padding: 6px 14px;
    border-radius: 100px;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.hero-desc {
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-icon {
    font-size: 18px;
}

/* --- Code Block Visual --- */
.hero-visual {
    display: flex;
    justify-content: center;
}

.code-block {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.code-header {
    display: flex;
    gap: 8px;
    padding: 14px 18px;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.code-body {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 2;
}

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

.code-string {
    color: var(--color-accent);
}

.code-value {
    color: var(--color-primary);
}

/* --- Quick Tool Section --- */
.quick-tool {
    padding: 0 0 60px;
}

.tool-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
}

.tool-card-full {
    padding: 32px;
}

.tool-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 4px;
    border: 1px solid var(--color-border);
}

.tool-tab {
    flex: 1;
    padding: 10px 20px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.tool-tab:hover {
    color: var(--color-text);
}

.tool-tab.active {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 8px var(--color-primary-glow);
}

.tool-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tool-input-group {
    position: relative;
}

.tool-textarea {
    width: 100%;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    resize: vertical;
    transition: border-color var(--transition);
    outline: none;
}

.tool-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.tool-textarea-lg {
    min-height: 200px;
}

.tool-textarea[readonly] {
    background: var(--color-bg-elevated);
    cursor: default;
}

.tool-actions-center {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.tool-input-group .btn-copy {
    position: absolute;
    bottom: 12px;
    right: 12px;
}

/* --- Encode/Decode Page Tool Grid --- */
.tool-section {
    padding: 40px 0;
}

.tool-header {
    text-align: center;
    margin-bottom: 40px;
}

.tool-header h1 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.tool-header p {
    color: var(--color-text-secondary);
    font-size: 16px;
}

.tool-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: start;
}

.tool-pane {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tool-pane-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.char-count {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-muted);
}

.tool-center-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 32px;
}

/* --- Features Section --- */
.features {
    padding: 80px 0;
}

.section-title {
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 800;
    text-align: center;
    margin-bottom: 48px;
    letter-spacing: -0.5px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-slow);
}

.feature-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 16px;
    display: block;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* --- Info Section --- */
.info-section {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
}

.info-block {
    margin-bottom: 40px;
}

.info-block:last-child {
    margin-bottom: 0;
}

.info-block h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.info-block p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 800px;
}

.uses-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
}

.uses-list li {
    padding: 12px 16px;
    padding-left: 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--color-text-secondary);
    position: relative;
}

.uses-list li::before {
    content: '>';
    position: absolute;
    left: 12px;
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-weight: 700;
}

/* --- Breadcrumb --- */
.breadcrumb {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb ol {
    display: flex;
    list-style: none;
    gap: 8px;
    font-size: 13px;
}

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

.breadcrumb li + li::before {
    content: '/';
    margin-right: 8px;
    color: var(--color-text-muted);
}

.breadcrumb a {
    color: var(--color-text-secondary);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

/* --- Page Sections --- */
.page-section {
    padding: 60px 0;
}

.page-header {
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.page-header p {
    color: var(--color-text-secondary);
    font-size: 16px;
}

.page-date {
    font-size: 14px;
    color: var(--color-text-muted);
    font-style: italic;
}

.page-content h2 {
    font-size: 20px;
    font-weight: 700;
    margin-top: 36px;
    margin-bottom: 12px;
    color: var(--color-text);
}

.page-content p {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.page-content .lead {
    font-size: 18px;
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

/* --- Contact Page --- */
.contact-info-center {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.contact-info-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px 56px;
    text-align: center;
    max-width: 480px;
    width: 100%;
}

.contact-info-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.contact-info-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-info-card p {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.contact-email-img {
    display: inline-block;
    padding: 12px 20px;
    background: var(--color-primary-soft);
    border-radius: var(--radius-md);
    border: 1px solid rgba(79, 138, 255, 0.2);
}

.contact-email-img img {
    display: block;
    height: 28px;
    width: auto;
}

/* --- Error Page --- */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.error-content {
    text-align: center;
}

.error-code {
    font-family: var(--font-mono);
    font-size: clamp(80px, 15vw, 160px);
    font-weight: 800;
    color: var(--color-primary);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 16px;
}

.error-content h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
}

.error-content p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

/* --- Footer --- */
.site-footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 32px;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    color: var(--color-text);
    text-decoration: none;
    margin-bottom: 12px;
}

.footer-logo:hover {
    color: var(--color-text);
}

.footer-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    max-width: 320px;
}

.footer-links h3 {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 14px;
    transition: color var(--transition);
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ==============================================================================
   Responsive Design
   ============================================================================== */

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        order: -1;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }

    .tool-center-controls {
        flex-direction: row;
        justify-content: center;
        padding-top: 0;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-list {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-lg);
    }

    .nav-list.open {
        display: flex;
    }

    .nav-link {
        padding: 12px 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .contact-info-card {
        padding: 32px 24px;
    }

    .hero {
        padding: 48px 0 32px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .features {
        padding: 48px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .tool-card {
        padding: 16px;
    }

    .tool-card-full {
        padding: 20px;
    }

    .feature-card {
        padding: 24px;
    }

    .lang-select {
        min-width: 80px;
        max-width: 120px;
        font-size: 12px;
    }
}

/* ==============================================================================
   RTL (Right-to-Left) Support — Arabic, etc.
   ============================================================================== */

[dir="rtl"] {
    direction: rtl;
    text-align: right;
}

[dir="rtl"] .header-inner {
    flex-direction: row-reverse;
}

[dir="rtl"] .nav-list {
    flex-direction: row-reverse;
}

[dir="rtl"] .hero .container {
    direction: rtl;
}

[dir="rtl"] .hero-actions {
    flex-direction: row-reverse;
}

[dir="rtl"] .tool-grid {
    direction: rtl;
}

[dir="rtl"] .breadcrumb ol {
    flex-direction: row-reverse;
}

[dir="rtl"] .breadcrumb li + li::before {
    content: '\\';
    margin-left: 8px;
    margin-right: 0;
}

[dir="rtl"] .footer-grid {
    direction: rtl;
}

[dir="rtl"] .uses-list li {
    padding-left: 16px;
    padding-right: 28px;
}

[dir="rtl"] .uses-list li::before {
    left: auto;
    right: 12px;
    content: '<';
}

[dir="rtl"] .tool-textarea {
    text-align: right;
    direction: rtl;
}

[dir="rtl"] .tool-input-group .btn-copy {
    right: auto;
    left: 12px;
}

[dir="rtl"] .lang-arrow {
    right: auto;
    left: 10px;
}

[dir="rtl"] .lang-select {
    padding: 8px 0 8px 20px;
}