/* ADVANCED UNIT CONVERTER STYLES - QUANTUM TOOLS */

/* === IMPORTING GLOBAL VARIABLES === */
:root {
    /* Core Color Palette - Dark Theme (Default) */
    --primary-bg: #0a0d14;
    --secondary-bg: #111827;
    --tertiary-bg: #1e293b;
    --accent-color-1: #00f0ff;
    --accent-color-2: #e100ff;
    --accent-color-3: #5061ff;
    --text-primary: #f5f7fa;
    --text-secondary: #94a3b8;
    
    /* Functional Colors */
    --glass-bg: rgba(18, 24, 38, 0.7);
    --card-border: rgba(0, 240, 255, 0.2);
    --glass-highlight: rgba(255, 255, 255, 0.05);
    --success-color: #4ade80;
    --warning-color: #fb923c;
    --error-color: #f87171;
    
    /* Animation Timing */
    --transition-fast: 0.3s;
    --transition-medium: 0.5s;
    --transition-slow: 0.8s;
}

/* Light Theme Variables */
body.light-theme {
    --primary-bg: #ffffff;
    --secondary-bg: #f8fafc;
    --tertiary-bg: #e2e8f0;
    --accent-color-1: #0066ff;
    --accent-color-2: #7c3aed;
    --accent-color-3: #2563eb;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --glass-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(0, 102, 255, 0.3);
    --glass-highlight: rgba(255, 255, 255, 0.8);
    --success-color: #16a34a;
    --warning-color: #ea580c;
    --error-color: #dc2626;
}

/* === BASE STYLES === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Orbitron', sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(229, 0, 255, 0.1) 0%, transparent 25%),
        radial-gradient(circle at 85% 85%, rgba(0, 240, 255, 0.1) 0%, transparent 25%);
    background-attachment: fixed;
    position: relative;
}

/* Simplified background pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        );
    opacity: 0.15;
    z-index: -2;
    pointer-events: none;
}

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

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 15px;
    position: relative;
}

/* === HEADER === */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 0.7rem 0;
    transition: all var(--transition-fast) ease;
    background: rgba(10, 13, 20, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(0, 240, 255, 0.1);
}

.light-theme header {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 102, 204, 0.2);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin: 0;
    background: linear-gradient(45deg, var(--accent-color-1), var(--accent-color-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    z-index: 2;
}

.logo h1::before {
    content: "";
    position: absolute;
    width: 30px;
    height: 30px;
    left: -10px;
    top: -5px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--accent-color-1), transparent);
    filter: blur(8px);
    z-index: -1;
}

/* === NAVIGATION === */
nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color-1) 0%, var(--accent-color-3) 100%);
    box-shadow: 0 3px 10px rgba(0, 240, 255, 0.3);
    transition: all var(--transition-fast) ease;
    position: relative;
    z-index: 101;
    order: 1;
    margin-right: 15px;
}

.light-theme .hamburger {
    background: linear-gradient(135deg, var(--accent-color-1) 0%, var(--accent-color-3) 100%);
    box-shadow: 0 3px 10px rgba(0, 102, 204, 0.3);
}

.hamburger:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(0, 240, 255, 0.5);
}

.hamburger .line {
    width: 25px;
    height: 2px;
    background-color: white;
    margin: 3px 0;
    transition: all var(--transition-fast) ease;
    border-radius: 2px;
}

.hamburger.active .line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
    background-color: var(--accent-color-2);
}

.hamburger.active .line:nth-child(2) {
    opacity: 0;
    transform: translateX(-15px);
}

.hamburger.active .line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
    background-color: var(--accent-color-2);
}

.hamburger.active:hover {
    transform: scale(1.05) rotate(180deg);
}

/* Navigation Links - Hidden by default, shown via hamburger */
.nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 100%;
    max-width: 350px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    transition: all var(--transition-medium) cubic-bezier(0.77, 0.2, 0.05, 1.0);
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    z-index: 100;
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.4);
    border-left: 2px solid var(--accent-color-1);
    list-style: none;
    padding: 2rem;
}

.nav-links.active {
    right: 0;
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
}

.light-theme .nav-links {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);
    border-left: 2px solid var(--accent-color-1);
}

.nav-links a {
    font-size: 1.2rem;
    font-weight: 600;
    padding: 1.2rem 2rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border-radius: 12px;
    transition: all var(--transition-fast) ease;
    width: 100%;
    text-align: center;
    position: relative;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links a:hover {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(225, 0, 255, 0.1));
    border-color: var(--accent-color-1);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 240, 255, 0.3);
}

.nav-links a.active {
    background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
    color: white;
    border-color: transparent;
}

/* Mobile Overlay */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast) ease;
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

.light-theme .mobile-overlay {
    background: rgba(0, 0, 0, 0.4);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 60px;
    height: 30px;
    border-radius: 30px;
    background: linear-gradient(to right, var(--accent-color-3), var(--accent-color-1));
    position: relative;
    cursor: pointer;
    margin-left: 20px;
    padding: 5px;
    transition: all var(--transition-fast) ease;
    order: 2;
    margin-left: auto;
    margin-right: 0;
}

.theme-toggle i {
    font-size: 16px;
    color: #fff;
    z-index: 1;
}

.theme-toggle-track {
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #fff;
    left: 4px;
    transition: transform var(--transition-medium) ease;
}

.light-theme .theme-toggle-track {
    transform: translateX(30px);
}

/* === TOOL HEADER === */
.tool-header {
    position: relative;
    background: linear-gradient(135deg, rgba(0, 0, 25, 0.7), rgba(0, 9, 36, 0.9));
    padding: 8rem 0 4rem;
    text-align: center;
    overflow: hidden;
}

.tool-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        );
    opacity: 0.15;
    z-index: 0;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
}

.header-content {
    position: relative;
    z-index: 2;
}

.tool-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.glowing-text {
    background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2), var(--accent-color-3), var(--accent-color-1));
    background-size: 300% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: textGradient 8s ease infinite;
    position: relative;
}

.glowing-text::after {
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2), var(--accent-color-3), var(--accent-color-1));
    background-size: 300% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: blur(15px);
    opacity: 0.8;
}

@keyframes textGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.tool-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* === CONVERTER SECTION === */
.converter-section {
    padding: 3rem 0;
}

.converter-container {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.converter-container::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2), var(--accent-color-3), var(--accent-color-2), var(--accent-color-1));
    background-size: 500% 100%;
    animation: gradient-animation 8s linear infinite;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.category-selection {
    margin-bottom: 2rem;
}

.category-selection label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.custom-select {
    position: relative;
    width: 100%;
}

.custom-select select {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    padding: 1rem 1.5rem;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background: var(--tertiary-bg);
    color: var(--text-primary);
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
}

.custom-select select:focus {
    outline: none;
    border-color: var(--accent-color-1);
    box-shadow: 0 0 0 2px rgba(0, 240, 255, 0.3);
}

.select-arrow {
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    color: var(--accent-color-1);
    pointer-events: none;
}

.conversion-interface {
    background: var(--secondary-bg);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(0, 240, 255, 0.1);
}

.conversion-row {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.input-group {
    flex: 1;
    min-width: 200px;
}

.input-group label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--text-secondary);
}

.input-group input {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background: var(--tertiary-bg);
    color: var(--text-primary);
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    transition: all var(--transition-fast) ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-color-1);
    box-shadow: 0 0 0 2px rgba(0, 240, 255, 0.3);
}

.units-group {
    display: flex;
    flex: 2;
    gap: 1rem;
    align-items: flex-end;
}

.from-unit, .to-unit {
    flex: 1;
}

.from-unit label, .to-unit label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 1rem;
    color: var(--text-secondary);
}

.swap-button {
    background: linear-gradient(135deg, var(--accent-color-3), var(--accent-color-1));
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-bg);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    margin: 0 0.5rem;
    align-self: center;
}

.swap-button:hover {
    transform: rotate(180deg);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
}

.result-section {
    margin-top: 2rem;
}

.result-container {
    background: var(--tertiary-bg);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.result-indicator {
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--secondary-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
}

.result-value {
    font-size: 3rem;
    font-weight: 700;
    margin: 0.5rem 0 1rem;
    background: linear-gradient(to right, var(--accent-color-1), var(--accent-color-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-family: 'Orbitron', sans-serif;
}

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

.conversion-history {
    background: var(--secondary-bg);
    border-radius: 15px;
    padding: 1.5rem;
}

.conversion-history h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.clear-history {
    background: transparent;
    border: none;
    color: var(--accent-color-2);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.clear-history:hover {
    color: var(--accent-color-1);
}

.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

#history-list li {
    padding: 0.8rem;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    transition: all var(--transition-fast) ease;
}

#history-list li:last-child {
    border-bottom: none;
}

#history-list li:hover {
    background: var(--tertiary-bg);
    border-radius: 5px;
}

#history-list li span.formula {
    color: var(--accent-color-1);
}

/* === FEATURE SECTION === */
.tool-features {
    padding: 4rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-medium) ease;
    border: 1px solid transparent;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 15px;
    padding: 1px;
    background: linear-gradient(45deg, var(--accent-color-1), var(--accent-color-2));
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    opacity: 0;
    transition: opacity var(--transition-medium) ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    margin-bottom: 1.5rem;
    font-size: 2rem;
    width: 70px;
    height: 70px;
    line-height: 70px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    position: relative;
    background: linear-gradient(45deg, rgba(0, 240, 255, 0.1), rgba(225, 0, 255, 0.1));
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.feature-icon i {
    background: linear-gradient(45deg, var(--accent-color-1), var(--accent-color-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    font-weight: 700;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* === FOOTER === */
footer {
    padding: 4rem 0;
    background: var(--secondary-bg);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: -3px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2), var(--accent-color-3), var(--accent-color-2), var(--accent-color-1));
    background-size: 500% 100%;
    animation: rainbow-border 10s linear infinite;
}

@keyframes rainbow-border {
    0% { background-position: 0% 0%; }
    100% { background-position: 200% 0%; }
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.copyright, .powered-by {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all var(--transition-fast) ease;
}

.social-link:hover {
    background: linear-gradient(45deg, var(--accent-color-1), var(--accent-color-2));
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 240, 255, 0.4);
}

/* === LIGHT THEME ENHANCEMENTS === */
.light-theme .tool-header {
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.9), rgba(241, 245, 249, 0.95));
    border-bottom: 1px solid rgba(0, 102, 255, 0.1);
}

.light-theme .tool-header::before {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(124, 58, 237, 0.05));
}

.light-theme .converter-container {
    background: var(--glass-bg);
    border: 1px solid rgba(0, 102, 255, 0.2);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
}

.light-theme .input-group input,
.light-theme .custom-select select {
    background: rgba(248, 250, 252, 0.8);
    border: 2px solid rgba(0, 102, 255, 0.2);
    color: var(--text-primary);
}

.light-theme .input-group input:focus,
.light-theme .custom-select select:focus {
    border-color: var(--accent-color-1);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.light-theme .result-container {
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.9), rgba(241, 245, 249, 0.95));
    border: 2px solid rgba(0, 102, 255, 0.2);
}

.light-theme .swap-button {
    background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-3));
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}

.light-theme .swap-button:hover {
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
    transform: translateY(-2px) scale(1.05);
}

.light-theme .hamburger .line {
    background-color: white;
}

.light-theme .hamburger:hover {
    box-shadow: 0 5px 15px rgba(0, 102, 255, 0.4);
}

.light-theme .hamburger.active .line:nth-child(1),
.light-theme .hamburger.active .line:nth-child(3) {
    background-color: var(--accent-color-1);
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1200px) {
    .tool-header h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 992px) {
    .conversion-row {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .input-group, .units-group {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-links {
        max-width: 350px;
    }
    
    .nav-links a {
        font-size: 1.2rem;
        padding: 1.2rem 2rem;
    }

    .tool-header h1 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .conversion-interface {
        padding: 1.5rem;
    }

    .units-group {
        flex-direction: column;
        gap: 1.5rem;
    }

    .swap-button {
        align-self: center;
        margin: 0 auto;
        transform: rotate(90deg);
    }

    .swap-button:hover {
        transform: rotate(270deg);
    }

    .result-value {
        font-size: 2.5rem;
    }
}

@media (max-width: 576px) {
    .converter-container {
        padding: 1.5rem;
    }
    
    .tool-header h1 {
        font-size: 1.8rem;
    }

    .result-value {
        font-size: 2rem;
    }
    
    .nav-links {
        max-width: 320px;
        padding: 1rem;
    }
    
    .nav-links a {
        font-size: 1.1rem;
        padding: 0.8rem 1.5rem;
    }
}

/* Additional responsive improvements */
@media (max-width: 768px) {
    .converter-container {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .conversion-interface {
        gap: 1.5rem;
    }
    
    .conversion-row {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .units-group {
        flex-direction: column;
        gap: 1rem;
    }
    
    .swap-button {
        align-self: center;
        transform: rotate(90deg);
        order: 2;
    }
    
    .from-unit {
        order: 1;
    }
    
    .to-unit {
        order: 3;
    }
    
    .quick-conversions-buttons {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 0.5rem;
    }
    
    .quick-conversion-btn {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
    
    .advanced-features {
        margin-top: 2rem;
    }
    
    .chart-container {
        height: 200px;
    }
    
    .keyboard-shortcuts ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .keyboard-shortcuts li {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .tool-header h1 {
        font-size: 2rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .nav-links {
        max-width: 320px;
        padding: 1rem;
    }
    
    .nav-links a {
        font-size: 1.1rem;
        padding: 0.8rem 1.5rem;
    }
    
    .converter-container {
        padding: 1rem;
        margin: 0.5rem;
    }
    
    .category-selection label {
        font-size: 0.9rem;
    }
    
    .input-group label {
        font-size: 0.9rem;
    }
    
    .result-container {
        padding: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* Skip to content link for accessibility */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    padding: 8px 15px;
    background: var(--accent-color-1);
    color: var(--primary-bg);
    border-radius: 0 0 5px 0;
    font-weight: bold;
    transition: top var(--transition-fast) ease;
    z-index: 1001;
}

.skip-to-content:focus {
    top: 0;
}

/* Focus styles for accessibility */
a:focus,
button:focus,
input:focus,
select:focus {
    outline: 2px solid var(--accent-color-1);
    outline-offset: 2px;
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}