* {
    scrollbar-width: none;
    scroll-behavior: smooth;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-orange: #FF6B35;
    --secondary-orange: #FF8A65;
    --primary-blue: #1E88E5;
    --secondary-blue: #42A5F5;
    --accent-orange: #FFB74D;
    --accent-blue: #81D4FA;
    --dark-navy: #0D47A1;
    --light-gray: #F5F5F5;
    --white: #FFFFFF;
    --shadow: rgba(0,0,0,0.1);
    --glow-orange: rgba(255, 107, 53, 0.3);
    --glow-blue: rgba(30, 136, 229, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-orange) 100%);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, var(--glow-orange) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--glow-blue) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255,255,255,0.1) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundFloat 20s ease-in-out infinite;
}

@keyframes backgroundFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(1deg); }
    66% { transform: translate(-20px, 20px) rotate(-1deg); }
}

/* Header */
header {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-bottom: 3px solid var(--primary-orange);
    box-shadow: 0 8px 32px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px var(--glow-orange);
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

.logo-text h1 {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.logo-text p {
    color: var(--dark-navy);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    color: white;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    from { text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
    to { text-shadow: 2px 2px 20px rgba(255,255,255,0.5); }
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Calculator Card */
.calculator-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    border: 2px solid rgba(255,255,255,0.3);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-orange), var(--primary-blue));
}

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

.form-group {
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-navy);
    font-size: 1rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid #E0E0E0;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-orange);
    box-shadow: 0 0 0 3px var(--glow-orange);
    transform: translateY(-2px);
}

.form-group .icon {
    position: absolute;
    right: 1rem;
    top: 2.2rem;
    color: var(--primary-blue);
    font-size: 1.2rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border: 2px solid #E0E0E0;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
}

.radio-option:hover {
    border-color: var(--primary-orange);
    transform: translateY(-2px);
}

.radio-option.active {
    border-color: var(--primary-orange);
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    color: white;
}

.radio-option input[type="radio"] {
    width: auto;
    margin: 0;
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 1.2rem 2rem;
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    color: white;
    border: none;
    border-radius: 15px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.calculate-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.calculate-btn:hover::before {
    left: 100%;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--glow-orange);
}

/* Macro Selector Styling */
.macro-selector-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: rgba(255,255,255,0.9);
    border-radius: 15px;
    box-shadow: 0 5px 20px var(--shadow);
}

.macro-selector-section h3 {
    text-align: center;
    color: var(--dark-navy);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.macro-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.macro-btn {
    padding: 1rem 1.5rem;
    border: 2px solid #E0E0E0;
    border-radius: 12px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 150px;
    position: relative;
    overflow: hidden;
}

.macro-btn:hover {
    border-color: var(--primary-orange);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--glow-orange);
}

.macro-btn.active {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    color: white;
    border-color: var(--primary-orange);
}

.macro-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.macro-btn.active::before,
.macro-btn:hover::before {
    left: 100%;
}

.macro-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.macro-ratio {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.2rem;
}

.macro-desc {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Results */
.results-section {
    margin-top: 3rem;
    display: none;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.result-card {
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    color: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px var(--shadow);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.5s;
    opacity: 0;
}

.result-card:hover::before {
    animation: shimmer 1.5s ease-in-out;
}

@keyframes shimmer {
    0% { transform: rotate(45deg) translate(-100%, -100%); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: rotate(45deg) translate(100%, 100%); opacity: 0; }
}

.result-card:hover {
    transform: translateY(-5px);
}

.goal-result {
    background: linear-gradient(135deg, #FF6B35, #1E88E5);
    animation: goalPulse 2s ease-in-out infinite alternate;
}

@keyframes goalPulse {
    from { box-shadow: 0 10px 30px var(--shadow); }
    to { box-shadow: 0 15px 40px var(--glow-orange); }
}

.goal-option[data-goal="cutting"].active {
    background: linear-gradient(135deg, #E53E3E, #C53030);
}

.goal-option[data-goal="maintain"].active {
    background: linear-gradient(135deg, #38A169, #2F855A);
}

.goal-option[data-goal="bulking"].active {
    background: linear-gradient(135deg, #3182CE, #2B6CB0);
}

.result-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.result-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.result-card .unit {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--dark-navy), #1565C0);
    color: white;
    padding: 3rem 0 1rem 0;
    margin-top: 5rem;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-orange), var(--primary-blue));
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--accent-orange);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-section p,
.footer-section li {
    color: rgba(255,255,255,0.8);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

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

.footer-section ul li {
    padding: 0.3rem 0;
    transition: color 0.3s ease;
    cursor: pointer;
}

.footer-section li a {
    display: inline-block;
    position: relative;
    color: inherit;
    text-decoration: none;
    padding-bottom: 2px;
}

.footer-section li a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;                     
    width: 100%;
    height: 2px;
    background: currentColor;      
    transform: scaleX(0);          
    transform-origin: left center; 
    transition: transform 0.35s ease;
    border-radius: 1px;           
}

.footer-section li a:hover::after,
.footer-section li a:focus-visible::after {
  transform: scaleX(1);
}

.footer-section li a.is-active::after,
.footer-section li[aria-current="page"] a::after {
  transform: scaleX(1);
}

.footer-section ul li:hover {
    color: var(--accent-orange);
    transform: translateX(5px);
}

.social-icons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-icon {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-orange), var(--primary-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--shadow);
}

.social-icon:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 8px 25px var(--glow-orange);
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero-title {
        font-size: 2rem;
    }

    .calculator-card {
        padding: 2rem;
    }

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

    .radio-group {
        flex-direction: column;
    }

    .macro-buttons {
        flex-direction: column;
        align-items: center;
    }
    .footer-section ul li,
    .footer-section li a::after {
        transition: none;
    }
}

/* Loading Animation */
.loading {
    display: none;
    text-align: center;
    margin: 2rem 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--primary-orange);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}