@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- DESIGN SYSTEM TOKENS --- */
:root {
    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Theme - Dark Mode (Default) */
    --bg-base: hsl(240, 10%, 4%);
    --bg-surface: hsl(240, 10%, 7%);
    --bg-surface-hover: hsl(240, 8%, 11%);
    --bg-surface-glass: rgba(15, 15, 17, 0.7);
    --border-color: #1f1f23;
    --border-color-hover: #2e2e33;
    --border-gradient: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --border-gradient-hover: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --border-gradient-focus: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(240, 5%, 65%);
    --text-muted: hsl(240, 5%, 45%);
    
    /* Branding */
    --primary: hsl(263, 90%, 55%);
    --primary-glow: hsla(263, 90%, 55%, 0.15);
    --primary-gradient: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --secondary-gradient: linear-gradient(135deg, hsl(280, 85%, 55%) 0%, hsl(340, 85%, 55%) 100%);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.6), 0 4px 12px -2px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 24px 0 hsla(263, 90%, 55%, 0.25);
    --glass-blur: 16px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-base: hsl(240, 15%, 98%);
    --bg-surface: hsl(0, 0%, 100%);
    --bg-surface-hover: hsl(240, 4%, 95%);
    --bg-surface-glass: rgba(255, 255, 255, 0.7);
    --border-color: #e2e2e9;
    --border-color-hover: #cbd5e1;
    --border-gradient: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --border-gradient-hover: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --border-gradient-focus: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --text-primary: hsl(240, 10%, 4%);
    --text-secondary: hsl(240, 5%, 40%);
    --text-muted: hsl(240, 5%, 60%);
    
    --primary: hsl(263, 90%, 55%);
    --primary-glow: hsla(263, 90%, 55%, 0.08);
    --primary-gradient: linear-gradient(135deg, hsl(263, 90%, 55%) 0%, hsl(220, 95%, 50%) 100%);
    --secondary-gradient: linear-gradient(135deg, hsl(280, 85%, 50%) 0%, hsl(340, 85%, 50%) 100%);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.05), 0 2px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08), 0 4px 12px -2px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 24px 0 hsla(263, 90%, 55%, 0.12);
}

/* --- RESET & BASIC STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

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

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    outline: none;
}

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

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.gradient-text-sec {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* --- GLASS CONTAINER --- */
.glass-panel {
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                var(--border-gradient) border-box;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    box-shadow: var(--shadow-md);
}

/* --- DYNAMIC BACKGROUND MESH --- */
.bg-mesh {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bg-mesh::before, .bg-mesh::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.12;
    mix-blend-mode: screen;
    animation: float-around 25s infinite alternate ease-in-out;
}

[data-theme="light"] .bg-mesh::before,
[data-theme="light"] .bg-mesh::after {
    opacity: 0.08;
    mix-blend-mode: multiply;
}

.bg-mesh::before {
    background: hsl(263, 90%, 65%);
    top: -200px;
    right: -100px;
    animation-duration: 20s;
}

.bg-mesh::after {
    background: hsl(220, 95%, 60%);
    bottom: -200px;
    left: -100px;
    animation-delay: -5s;
}

@keyframes float-around {
    0% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(80px, 60px) scale(1.1);
    }
    100% {
        transform: translate(-40px, -80px) scale(0.95);
    }
}

/* --- GLOBAL HEADER (Web Component Styles) --- */
global-header {
    display: block;
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
}

.header-wrapper {
    height: 72px;
    transition: all var(--transition-normal);
}

.header-scrolled .header-wrapper {
    height: 64px;
    background: var(--bg-surface-glass);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    text-transform: tracking-tight;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.logo-text span {
    font-weight: 400;
    opacity: 0.8;
}

/* Navigation */
.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Action Controls */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme Toggle Slider Switch */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

.theme-switch {
    display: inline-block;
    height: 28px;
    position: relative;
    width: 50px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: var(--border-color);
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: var(--transition-normal);
    border-radius: 34px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
}

.slider-icon {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    z-index: 1;
    transition: color var(--transition-normal);
}

.slider-icon.sun {
    margin-left: 2px;
}

.slider-icon.moon {
    margin-right: 2px;
}

.slider:before {
    background-color: var(--text-primary);
    bottom: 3px;
    content: "";
    height: 20px;
    left: 3px;
    position: absolute;
    transition: var(--transition-normal);
    width: 20px;
    border-radius: 50%;
    z-index: 2;
    box-shadow: var(--shadow-sm);
}

input:checked + .slider {
    background-color: var(--primary-glow);
    border-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(22px);
    background: var(--primary-gradient);
}

/* Mobile Menu Button */
.menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    cursor: pointer;
    z-index: 101;
}

.menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.menu-btn.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.menu-btn.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Drawer Overlay */
.mobile-drawer {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background-color: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    padding: 96px 32px 32px 32px;
    display: flex;
    flex-direction: column;
    gap: 32px;
    transition: right var(--transition-normal);
    z-index: 99;
    box-shadow: var(--shadow-lg);
}

.mobile-drawer.active {
    right: 0;
}

.mobile-links {
    display: flex;
    flex-direction: column;
    gap: 24px;
    list-style: none;
}

.mobile-link {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.mobile-link:hover, .mobile-link.active {
    color: var(--text-primary);
}

/* --- HERO SECTION --- */
.hero {
    padding: 80px 0 60px 0;
    text-align: center;
    position: relative;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--primary-glow);
    border: 1px solid hsla(263, 90%, 60%, 0.2);
    color: var(--primary);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.15;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px auto;
}

/* Search Bar Wrapper */
.search-wrapper {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.search-bar {
    width: 100%;
    height: 56px;
    padding: 0 24px 0 54px;
    border-radius: var(--radius-lg);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    font-size: 1.05rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.search-bar:focus {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    background-color: var(--bg-surface-hover);
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-normal);
}

.search-bar:focus ~ .search-icon {
    color: var(--primary);
}

/* --- MAIN CONTAINER --- */
main {
    flex: 1;
}

/* --- CATEGORIES & CARDS --- */
.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.category-section {
    margin-bottom: 60px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* Cards */
.tool-card {
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                linear-gradient(135deg, var(--border-color) 0%, transparent 100%) border-box;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.tool-card:hover {
    transform: translateY(-4px);
    background: linear-gradient(var(--bg-surface-hover), var(--bg-surface-hover)) padding-box,
                var(--primary-gradient) border-box;
    box-shadow: var(--shadow-md);
}

.tool-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
    transition: all var(--transition-normal);
}

.tool-card:hover .tool-icon-wrapper {
    background: var(--primary-gradient);
    color: white;
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.tool-meta {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tool-badge {
    align-self: flex-start;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--border-color);
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.tool-badge.badge-popular {
    background: rgba(280, 85, 55, 0.1);
    color: hsl(280, 85%, 55%);
}

.tool-badge.badge-new {
    background: rgba(340, 85, 55, 0.1);
    color: hsl(340, 85%, 55%);
}

.tool-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.tool-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

.tool-arrow {
    align-self: flex-end;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: all var(--transition-normal);
}

.tool-card:hover .tool-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

/* Grid Filter Alert */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px;
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    border: 1px dashed var(--border-color);
    color: var(--text-secondary);
    display: none;
}

/* --- SECURITY & VALUE PROP --- */
.value-props {
    padding: 60px 0;
    background: linear-gradient(180deg, transparent, rgba(15, 15, 17, 0.4));
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

[data-theme="light"] .value-props {
    background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.02));
}

.props-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.prop-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 24px;
}

.prop-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.75rem;
}

.prop-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.prop-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    max-width: 320px;
}

/* --- GLOBAL FOOTER (Web Component Styles) --- */
global-footer {
    display: block;
    width: 100%;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

.footer-wrapper {
    padding: 64px 0 32px 0;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    justify-content: space-between;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.5;
}

.footer-links-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 64px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-width: 140px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-socials {
    display: flex;
    gap: 16px;
}

.social-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-icon:hover {
    color: var(--primary);
    border-color: var(--primary);
    background-color: var(--primary-glow);
    transform: translateY(-2px);
}

/* --- RESPONSIVE BREAKPOINTS --- */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.75rem;
    }
    .footer-links-grid {
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 60px 0 40px 0;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero p {
        font-size: 1.05rem;
        margin-bottom: 28px;
    }
    
    .footer-top {
        flex-direction: column;
        gap: 36px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.85rem;
    }
    .container {
        padding: 0 16px;
    }
    .props-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   TOOL CONVERTER COMPONENT SYSTEM
   ========================================================================== */
.tool-container {
    padding: 40px 0 60px 0;
}

.converter-panel {
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 40px;
    position: relative;
    transition: padding var(--transition-normal);
}

.converter-card-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 24px;
    margin-bottom: 8px;
    transition: all var(--transition-normal);
}

.converter-card {
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                var(--border-gradient) border-box;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.converter-card:hover {
    background: linear-gradient(var(--bg-surface-hover), var(--bg-surface-hover)) padding-box,
                var(--border-gradient-hover) border-box;
}

.converter-card:focus-within {
    background: linear-gradient(var(--bg-surface-hover), var(--bg-surface-hover)) padding-box,
                var(--border-gradient-focus) border-box;
    box-shadow: var(--shadow-glow);
}

.card-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition-normal);
}

.converter-card:focus-within .card-label {
    color: var(--primary);
}

.card-input-wrapper {
    display: flex;
    align-items: center;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    height: 64px;
    padding: 0 20px;
    background: linear-gradient(var(--bg-base), var(--bg-base)) padding-box,
                var(--border-gradient) border-box;
    transition: all var(--transition-normal);
}

.converter-card:focus-within .card-input-wrapper {
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                var(--border-gradient-focus) border-box;
}

.card-input {
    flex: 1;
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--text-primary);
    width: 100%;
    min-width: 0;
    height: 100%;
}

.card-result-display {
    flex: 1;
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-heading);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 8px;
    min-width: 0;
    height: 100%;
    display: flex;
    align-items: center;
}

.select-divider {
    width: 1px;
    height: 32px;
    background-color: var(--border-color);
    margin: 0 20px;
    flex-shrink: 0;
    transition: background-color var(--transition-normal);
}

.converter-card:focus-within .select-divider {
    background-color: var(--primary-glow);
}

.card-select {
    width: 180px;
    height: 100%;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='gray' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0 center;
    background-size: 16px;
    padding-right: 24px;
    flex-shrink: 0;
}

.card-unit-static {
    width: 180px;
    height: 100%;
    display: flex;
    align-items: center;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    flex-shrink: 0;
    user-select: none;
}

.card-copy-btn-inner {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                var(--border-gradient) border-box;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-left: 12px;
    flex-shrink: 0;
}

.card-copy-btn-inner:hover {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

/* Swap Divider / Circle */
.swap-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.swap-circle {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 1px solid transparent;
    background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
                var(--border-gradient) border-box;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.swap-circle:hover {
    background: linear-gradient(var(--primary-glow), var(--primary-glow)) padding-box,
                var(--border-gradient-focus) border-box;
    color: var(--primary);
    transform: rotate(180deg);
    box-shadow: var(--shadow-glow);
}

/* Multi conversion grid */
.all-conversions {
    margin-top: 48px;
}

.all-conversions h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    font-weight: 700;
}

.all-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.unit-card {
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 12px;
    transition: all var(--transition-normal);
    position: relative;
}

.unit-card:hover {
    transform: translateY(-2px);
    background-color: var(--bg-surface-hover);
}

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

.unit-name {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-copy-btn:hover {
    color: var(--primary);
}

.unit-value {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
    word-break: break-all;
    line-height: 1.2;
}

/* Information & SEO Content */
.info-section {
    margin-top: 64px;
    border-top: 1px solid var(--border-color);
    padding-top: 48px;
}

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

.info-content {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.info-content h2, .info-content h3 {
    font-family: var(--font-heading);
}

.info-content h2 {
    font-size: 1.75rem;
}

.info-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.formula-table-card {
    padding: 28px;
    border-radius: var(--radius-md);
}

.formula-table-card h3 {
    margin-bottom: 20px;
    font-size: 1.25rem;
}

.formula-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.formula-table th, .formula-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.formula-table th {
    color: var(--text-primary);
    font-weight: 600;
}

.formula-table td {
    color: var(--text-secondary);
}

/* Success Notification Bubble */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--bg-surface);
    border: 1px solid var(--primary);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* --- ADAPTIVE MOBILE OVERRIDES FOR TOOLS --- */
@media (max-width: 992px) {
    .converter-card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .swap-divider {
        margin: -8px 0;
    }
    
    .swap-circle {
        transform: rotate(90deg); /* Point swap arrows vertically on mobile */
    }
    
    .swap-circle:hover {
        transform: rotate(270deg) !important;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 600px) {
    .tool-container {
        padding: 20px 0 40px 0;
    }
    
    .converter-panel {
        padding: 20px 16px;
        margin-bottom: 24px;
    }
    
    .converter-card {
        padding: 18px 16px;
        gap: 10px;
        border-radius: var(--radius-md);
    }
    
    .card-input-wrapper {
        height: 54px;
        padding: 0 12px;
    }
    
    .card-input, .card-result-display {
        font-size: 1.3rem;
    }
    
    .select-divider {
        margin: 0 12px;
        height: 24px;
    }
    
    .card-select {
        width: 124px;
        font-size: 0.92rem;
        padding-right: 20px;
        background-size: 12px;
    }
    
    .card-unit-static {
        width: 124px;
        font-size: 0.92rem;
    }
    
    .card-copy-btn-inner {
        width: 34px;
        height: 34px;
        border-radius: 6px;
        margin-left: 8px;
    }
    
    .all-conversions {
        margin-top: 32px;
    }
    
    .all-conversions h2 {
        font-size: 1.25rem;
        margin-bottom: 16px;
    }
    
    .all-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .unit-card {
        padding: 16px;
    }
    
    .unit-value {
        font-size: 1.25rem;
    }
    
    .formula-table-card {
        padding: 16px;
    }
    
    .formula-table th, .formula-table td {
        padding: 8px 6px;
        font-size: 0.82rem;
    }
    
    .info-content h2 {
        font-size: 1.4rem;
    }
    
    .info-content h3 {
        font-size: 1.15rem;
    }
    
    .info-content p {
        font-size: 0.92rem;
        line-height: 1.6;
    }
}

/* --- CONTACT US PAGE STYLING --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 32px;
    margin-top: 40px;
    margin-bottom: 80px;
    align-items: start;
}

.contact-form-container {
    padding: 40px;
    border-radius: var(--radius-lg);
}

.contact-title {
    font-size: 2.25rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.contact-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 32px;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.form-input-wrapper {
    position: relative;
    border-radius: var(--radius-md);
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input-wrapper:focus-within {
    border-color: transparent;
    background: linear-gradient(var(--bg-base), var(--bg-base)) padding-box,
                var(--border-gradient-focus) border-box;
    box-shadow: var(--shadow-glow);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 14px 18px;
    background: transparent;
    color: var(--text-primary);
    border: none;
    outline: none;
    font-family: var(--font-body);
    font-size: 0.95rem;
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 18px center;
    background-size: 16px;
    padding-right: 48px;
    cursor: pointer;
}

.form-select option {
    background-color: var(--bg-surface);
    color: var(--text-primary);
}

.contact-btn {
    width: 100%;
    padding: 16px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    color: white;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

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

.contact-btn:active {
    transform: translateY(0);
}

.contact-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-card {
    padding: 32px;
    border-radius: var(--radius-lg);
}

.sidebar-card-title {
    font-size: 1.3rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-card-text {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.copy-email-btn {
    margin-top: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-size: 0.88rem;
    font-weight: 600;
    background: var(--bg-base);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-email-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-glow);
}

@media (max-width: 992px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 600px) {
    .contact-form-container {
        padding: 24px 20px;
    }
    .contact-title {
        font-size: 1.8rem;
    }
    .sidebar-card {
        padding: 24px 20px;
    }
}