/* ============================================
   ProtectUrHealth - Global Design System
   Mobile-First Responsive | Dark/Light Theme
   ============================================ */

/* --- Google Fonts Import --- */


/* --- CSS Custom Properties (Light Theme - Default) --- */
:root {
    --primary: #004e4a;
    --primary-light: #006b65;
    --secondary: #007a70;
    --accent: #00b894;
    --accent-light: #34d399;
    --accent-glow: rgba(0, 184, 148, 0.3);

    --bg-primary: #f0f9ff;
    --bg-secondary: #e6f4ff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fffe;
    --bg-nav: rgba(255, 255, 255, 0.85);
    --bg-footer: #004e4a;
    --bg-input: #ffffff;
    --bg-hero: linear-gradient(135deg, #004e4a 0%, #007a70 50%, #00b894 100%);
    --bg-section-alt: #f1f8ff;

    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-on-primary: #ffffff;
    --text-heading: #004e4a;

    --border-color: rgba(0, 78, 74, 0.1);
    --border-card: rgba(0, 78, 74, 0.08);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(0, 184, 148, 0.15);

    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-accent: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 255, 254, 0.8));

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    --font-body: 'Inter', sans-serif;
    --font-heading: 'Montserrat', sans-serif;

    --glass-bg: rgba(255, 255, 255, 0.4);
    --glass-border: rgba(255, 255, 255, 0.2);
    --text: #1e293b;

    --nav-height: 90px;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
    --primary: #34d399;
    --primary-light: #6ee7b7;
    --secondary: #10b981;
    --accent: #34d399;
    --accent-light: #6ee7b7;
    --accent-glow: rgba(52, 211, 153, 0.25);

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-card-hover: #263548;
    --bg-nav: rgba(15, 23, 42, 0.92);
    --bg-footer: #0c1222;
    --bg-input: #1e293b;
    --bg-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f4c3a 100%);
    --bg-section-alt: #162032;

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-on-primary: #0f172a;
    --text-heading: #34d399;

    --border-color: rgba(52, 211, 153, 0.15);
    --border-card: rgba(52, 211, 153, 0.1);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(52, 211, 153, 0.15);

    --gradient: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-accent: linear-gradient(135deg, #059669 0%, #34d399 100%);
    --gradient-card: #1e293b;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(52, 211, 153, 0.2);
    --text: #e2e8f0;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
    transition: background var(--transition-slow), color var(--transition-slow);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    z-index: 1001;
}

.nav-logo img {
    height: 60px;
    width: auto;
    object-fit: contain;
    transition: all var(--transition-base);
}

.logo-hide {
    display: block;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.6rem;
    /* Slightly larger */
    color: var(--text-heading);
    letter-spacing: -0.8px;
    background: var(--gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.05));
}

.nav-logo:hover img {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.nav-links {
    display: none;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    display: flex;
    align-items: center;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
    background: rgba(0, 184, 148, 0.08);
}

/* Dropdown Styles */
.nav-item-dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.dropdown-toggle i {
    font-size: 0.8rem;
    transition: transform var(--transition-base);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--bg-card);
    min-width: 220px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 1000;
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px;
}

.dropdown-menu a {
    padding: 10px 16px !important;
    display: flex !important;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem !important;
    color: var(--text-primary) !important;
    background: transparent !important;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.dropdown-menu a i {
    width: 20px;
    text-align: center;
    color: var(--accent);
}

.dropdown-menu a:hover {
    background: rgba(0, 184, 148, 0.08) !important;
    color: var(--accent) !important;
    transform: translateX(5px);
}

/* Ensure Dropdown consistency in Dark Mode */
[data-theme="dark"] .dropdown-menu {
    background: var(--bg-card) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .dropdown-menu a {
    color: var(--text-primary) !important;
}

/* Show Dropdown on Hover (Desktop) */
@media (min-width: 992px) {
    .nav-item-dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .nav-item-dropdown:hover .dropdown-toggle i {
        transform: rotate(180deg);
    }
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 1001;
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(30deg);
}

.hamburger {
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-card);
    padding: 100px 30px 40px;
    transition: right var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
}

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

.mobile-menu a {
    display: block;
    padding: 14px 16px;
    margin-bottom: 4px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.mobile-menu a:hover {
    background: rgba(0, 184, 148, 0.1);
    color: var(--accent);
    padding-left: 24px;
}

/* Mobile Dropdown Styles */
.mobile-nav-item {
    width: 100%;
}

.mobile-dropdown-toggle {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.mobile-dropdown-toggle i {
    transition: transform var(--transition-base);
}

.mobile-nav-item.active .mobile-dropdown-toggle i {
    transform: rotate(180deg);
}

.mobile-dropdown-content {
    display: none;
    padding-left: 15px;
    background: rgba(0, 184, 148, 0.05);
    border-radius: var(--radius-md);
    margin: 5px 0 10px;
}

.mobile-nav-item.active .mobile-dropdown-content {
    display: block;
}

.mobile-dropdown-content a {
    font-size: 0.9rem !important;
    padding: 10px 16px !important;
    margin-bottom: 2px !important;
}

.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    padding: calc(var(--nav-height) + 40px) 0 60px;
    background: var(--bg-hero);
    color: var(--text-on-primary);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

[data-theme="dark"] .hero {
    color: #e2e8f0;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(0, 184, 148, 0.2) 0%, transparent 25%),
        radial-gradient(circle at 80% 70%, rgba(0, 184, 148, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    animation: heroPulse 20s ease-in-out infinite;
}

@keyframes heroPulse {

    0%,
    100% {
        opacity: 0.5;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.03);
    }
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
    padding: 0 16px;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    text-align: center;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1rem;
    margin-bottom: 32px;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
    text-align: center;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .btn-primary {
    background: var(--accent);
    color: #0f172a;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
    transform: translateY(-3px);
}

.btn-accent {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 16px var(--accent-glow);
}

[data-theme="dark"] .btn-accent {
    background: var(--gradient);
    color: #0f172a;
}

.btn-accent:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

/* --- Health Icon Grid (Hero) --- */
.health-icons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 40px;
}

.health-icon-item {
    text-align: center;
    padding: 16px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    transition: all var(--transition-base);
    cursor: pointer;
}

.health-icon-item:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.health-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 60px;
    width: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    transition: all var(--transition-base);
}

.health-icon-item:hover .health-icon {
    transform: scale(1.1) rotate(5deg);
    background: var(--accent);
}

.health-icon-item h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.health-icon-item p {
    font-size: 0.8rem;
    opacity: 0.75;
}

/* --- Stats --- */
.stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* --- Section Styles --- */
.section {
    padding: 60px 0;
    position: relative;
}

.section-alt {
    background: var(--bg-section-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--text-heading);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 560px;
    margin: 16px auto 0;
    font-size: 0.95rem;
}

/* --- Tool Cards --- */
.tools-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.tool-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--gradient-accent);
    transition: height 0.4s ease;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.tool-card:hover::before {
    height: 100%;
}

.tool-icon-wrap {
    background: var(--gradient);
    color: #fff;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.6rem;
    transition: all var(--transition-base);
}

[data-theme="dark"] .tool-icon-wrap {
    color: #0f172a;
}

.tool-card:hover .tool-icon-wrap {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 20px var(--accent-glow);
}

.tool-card h3 {
    color: var(--text-heading);
    margin-bottom: 10px;
    font-size: 1.2rem;
    font-weight: 700;
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--gradient);
    color: #fff;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-base);
}

[data-theme="dark"] .tool-btn {
    color: #0f172a;
}

.tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.tool-btn i {
    transition: transform var(--transition-fast);
}

.tool-btn:hover i {
    transform: translateX(3px);
}

/* --- Feature Cards --- */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-6px);
    background: var(--gradient);
    color: #fff;
    box-shadow: var(--shadow-lg);
}

.feature-card:hover h3,
.feature-card:hover p {
    color: #fff;
}

.feature-icon {
    font-size: 2.2rem;
    color: var(--accent);
    margin-bottom: 16px;
    transition: all var(--transition-base);
}

.feature-card:hover .feature-icon {
    color: #fff;
    transform: scale(1.15);
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-heading);
    transition: color var(--transition-base);
}

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

/* --- Calculator/Tool Page Styles --- */
.page-hero {
    padding: calc(var(--nav-height) + 40px) 0 50px;
    background: var(--bg-hero);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .page-hero {
    color: #e2e8f0;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 40%, rgba(0, 184, 148, 0.2) 0%, transparent 30%),
        radial-gradient(circle at 70% 60%, rgba(0, 184, 148, 0.15) 0%, transparent 30%);
    animation: heroPulse 20s ease-in-out infinite;
}

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

.page-hero h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 0.85rem;
    opacity: 0.8;
}

.breadcrumb a {
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb .separator {
    opacity: 0.5;
}

/* Calculator Card */
.calc-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 40px 0 60px;
}

.calc-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px 24px;
    box-shadow: var(--shadow-md);
}

.calc-card h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-heading);
    margin-bottom: 24px;
    text-align: center;
    position: relative;
    padding-bottom: 12px;
}

.calc-card h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.input-group {
    display: flex;
    align-items: center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-base);
    background: var(--bg-input);
}

.input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.input-group input,
.input-group select {
    flex: 1;
    padding: 14px 16px;
    border: none;
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    background: transparent;
    color: var(--text-primary);
}

.input-group select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

[data-theme="dark"] .input-group select option {
    background: #1e293b;
    color: #e2e8f0;
}

.input-group .unit {
    padding: 0 14px;
    background: rgba(0, 184, 148, 0.08);
    font-weight: 600;
    color: var(--accent);
    font-size: 0.85rem;
    height: 100%;
    display: flex;
    align-items: center;
}

.calculate-btn {
    background: var(--gradient);
    color: #fff;
    border: none;
    padding: 16px;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    width: 100%;
    margin-top: 8px;
    box-shadow: 0 6px 20px var(--accent-glow);
}

[data-theme="dark"] .calculate-btn {
    color: #0f172a;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px var(--accent-glow);
}

.gender-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.gender-option-btn {
    padding: 12px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-base);
    color: var(--text-primary);
    font-family: var(--font-body);
}

.gender-option-btn.active {
    background: var(--gradient);
    color: #fff;
    border-color: var(--accent);
}

/* Results */
.result-value {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--text-heading);
    margin: 16px 0;
}

@media (max-width: 480px) {
    .result-value {
        font-size: 2.2rem;
    }
}

.result-category {
    display: inline-block;
    padding: 8px 24px;
    border-radius: var(--radius-full);
    background: var(--gradient-accent);
    color: #fff;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.result-scale {
    height: 24px;
    border-radius: 12px;
    background: linear-gradient(to right, #ef4444, #f59e0b, #22c55e, #3b82f6);
    position: relative;
    margin: 24px 0;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.result-indicator {
    position: absolute;
    top: -8px;
    width: 4px;
    height: 40px;
    background: #fff;
    border-radius: 2px;
    transition: left 1s ease;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
}

.result-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.result-info {
    background: var(--bg-section-alt);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-top: 24px;
    border: 1px solid var(--border-color);
}

.result-info h3 {
    color: var(--text-heading);
    margin-bottom: 12px;
}

.result-info ul {
    padding-left: 20px;
    list-style: disc;
}

.result-info li {
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- FAQ --- */
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 18px 20px;
    font-weight: 600;
    color: var(--text-heading);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
}

.faq-toggle {
    transition: transform var(--transition-base);
    color: var(--accent);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 20px 20px;
}

.faq-item.active .faq-toggle i {
    transform: rotate(180deg);
}

/* --- Category Cards --- */
.categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid transparent;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.category-card.underweight {
    border-left-color: #3b82f6;
}

.category-card.normal {
    border-left-color: #22c55e;
}

.category-card.overweight {
    border-left-color: #f59e0b;
}

.category-card.obese {
    border-left-color: #ef4444;
}

.category-range {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.underweight .category-range {
    color: #3b82f6;
}

.normal .category-range {
    color: #22c55e;
}

.overweight .category-range {
    color: #f59e0b;
}

.obese .category-range {
    color: #ef4444;
}

.category-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-heading);
}

.category-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* --- Instruction Cards --- */
.instructions-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.instruction-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.instruction-card:hover {
    transform: translateY(-5px);
    background: var(--gradient);
    color: #fff;
    box-shadow: var(--shadow-lg);
}

.instruction-card:hover h3,
.instruction-card:hover p {
    color: #fff;
}

.instruction-number {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    margin: 0 auto 16px;
    transition: all var(--transition-base);
}

.instruction-card:hover .instruction-number {
    background: #fff;
    color: var(--primary);
}

.instruction-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--text-heading);
    transition: color var(--transition-base);
}

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

/* --- Related Tools Section --- */
.related-tools-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

/* --- Footer --- */
footer {
    background: var(--bg-footer);
    color: #fff;
    padding: 50px 0 24px;
    margin-top: auto;
}

[data-theme="dark"] footer {
    background: #0c1222;
    border-top: 1px solid rgba(52, 211, 153, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.footer-column h3 {
    font-size: 1.15rem;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 36px;
    height: 2px;
    background: var(--accent);
}

.footer-column p {
    opacity: 0.8;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

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

.footer-links a {
    opacity: 0.75;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent);
    padding-left: 6px;
}

.social-links {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
    font-size: 0.85rem;
}

.footer-bottom-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 12px;
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

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

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 100;
}

[data-theme="dark"] .back-to-top {
    color: #0f172a;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-24px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade {
    animation: fadeInUp 0.8s ease forwards;
}

/* Floating Elements */
.floating-element {
    position: absolute;
    z-index: 1;
    opacity: 0.5;
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.8rem;
}

.float-1 {
    top: 20%;
    left: 8%;
    animation: floatAnim 8s ease-in-out infinite;
}

.float-2 {
    top: 60%;
    left: 4%;
    animation: floatAnim 10s ease-in-out infinite 1s;
}

.float-3 {
    top: 30%;
    right: 8%;
    animation: floatAnim 9s ease-in-out infinite 0.5s;
}

.float-4 {
    top: 70%;
    right: 6%;
    animation: floatAnim 11s ease-in-out infinite 1.5s;
}

@keyframes floatAnim {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-18px) rotate(5deg);
    }
}

/* Background Animation Bubbles */
.bg-animation {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-glow);
    animation: bubbleFloat 15s infinite ease-in-out;
}

@keyframes bubbleFloat {

    0%,
    100% {
        transform: translateY(0) scale(1);
        opacity: 0.3;
    }

    50% {
        transform: translateY(-20px) scale(1.1);
        opacity: 0.5;
    }
}

/* --- Contact Page --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px 24px;
    box-shadow: var(--shadow-md);
}

.contact-card h2 {
    font-family: var(--font-heading);
    color: var(--text-heading);
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 10px;
    font-size: 1.4rem;
}

.contact-card h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--accent);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 22px;
}

.info-icon {
    background: var(--gradient);
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
}

[data-theme="dark"] .info-icon {
    color: #0f172a;
}

.info-content h3 {
    font-size: 1rem;
    margin-bottom: 4px;
    color: var(--text-heading);
}

.info-content p,
.info-content a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-base);
    background: var(--bg-input);
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

textarea.form-control {
    min-height: 140px;
    resize: vertical;
}

.submit-btn {
    background: var(--gradient);
    color: #fff;
    border: none;
    padding: 14px 36px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 6px 20px var(--accent-glow);
}

[data-theme="dark"] .submit-btn {
    color: #0f172a;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px var(--accent-glow);
}

/* --- Legal Pages --- */
.legal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px 24px;
    box-shadow: var(--shadow-md);
    margin: 40px 0 60px;
}

.legal-content h2 {
    font-family: var(--font-heading);
    color: var(--text-heading);
    font-size: 1.4rem;
    margin: 28px 0 12px;
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.legal-content ul {
    padding-left: 20px;
    list-style: disc;
    margin-bottom: 16px;
}

.legal-content li {
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   Responsive Breakpoints (Mobile First)
   ============================================ */

/* Small devices (576px+) */
@media (min-width: 576px) {
    .container {
        padding: 0 24px;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: row;
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .instructions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .related-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }

    .section {
        padding: 80px 0;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .page-hero h1 {
        font-size: 2.4rem;
    }

    .health-icons {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-number {
        font-size: 2.4rem;
    }

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

/* Medium devices (768px+) */
@media (min-width: 768px) {
    .hero h1 {
        font-size: 3.2rem;
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .calc-container {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .calc-card {
        padding: 36px 32px;
    }

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

    .legal-content {
        padding: 40px 36px;
    }

    .section-header h2 {
        font-size: 2.2rem;
    }

    .health-icons {
        grid-template-columns: repeat(4, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Large devices (992px+) */
@media (min-width: 992px) {
    .nav-links {
        display: flex;
    }

    .hamburger {
        display: none;
    }

    .mobile-menu,
    .mobile-overlay {
        display: none;
    }

    .hero h1 {
        font-size: 3.6rem;
    }

    .hero {
        min-height: 90vh;
    }

    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .instructions-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .related-tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
    }

    .section {
        padding: 100px 0;
    }

    .section-header h2 {
        font-size: 2.5rem;
    }

    .page-hero h1 {
        font-size: 3rem;
    }
}

/* Extra large devices (1200px+) */
@media (min-width: 1200px) {
    .hero h1 {
        font-size: 4rem;
    }

    .container {
        padding: 0 32px;
    }
}

/* --- Utility --- */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: 8px;
}

.mt-2 {
    margin-top: 16px;
}

.mt-3 {
    margin-top: 24px;
}

.mt-4 {
    margin-top: 32px;
}

.mb-2 {
    margin-bottom: 16px;
}

.mb-3 {
    margin-bottom: 24px;
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}