/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --color-primary: #667eea;
    --color-primary-dark: #5a67d8;
    --color-secondary: #764ba2;
    --color-accent: #f093fb;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-bg-main: #0f0f23;
    --color-bg-card: rgba(255, 255, 255, 0.05);
    --color-bg-input: rgba(255, 255, 255, 0.08);

    --color-text-primary: #ffffff;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #718096;

    --color-border: rgba(255, 255, 255, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-bg: linear-gradient(180deg, #0f0f23 0%, #1a1a3e 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--gradient-bg);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes float {

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

    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }

    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

/* ===== LAYOUT ===== */
.app-container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ===== HEADER ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo svg {
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.5));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

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

    50% {
        transform: scale(1.05);
    }
}

.header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 300;
}

/* ===== CARD STYLES ===== */
.card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* ===== FORM STYLES ===== */
.form-card h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.form-card h3 {
    font-size: var(--font-size-xl);
    margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
    color: var(--color-primary);
}

.info-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

input,
select {
    width: 100%;
    padding: 0.875rem var(--spacing-sm);
    background: var(--color-bg-input);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: all var(--transition-base);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

input::placeholder {
    color: var(--color-text-muted);
}

small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/* ===== BUTTONS ===== */
.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    padding: 1rem var(--spacing-lg);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary,
.btn-outline {
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-secondary {
    background: var(--gradient-primary);
    border: none;
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-whatsapp {
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: #25D366;
    border: none;
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-whatsapp:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background: #20BA5A;
}


.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

/* ===== RESULTS SECTION ===== */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.results-header h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-xs);
}

.results-header h2 span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-date {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.metric-card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: var(--color-primary);
}

.metric-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    font-weight: 600;
}

.gauge-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: var(--spacing-md) 0;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}

.gauge-container canvas {
    max-width: 100%;
    height: auto;
}

.metric-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.metric-value .value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-value .unit {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

.metric-status {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    display: inline-block;
}

.metric-status.normal {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
}

.metric-status.warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
}

.metric-status.danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-danger);
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.disclaimer {
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-style: italic;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    :root {
        /* Increase base font sizes for better mobile readability */
        --font-size-sm: 0.9375rem;
        /* 15px */
        --font-size-base: 1.0625rem;
        /* 17px */
        --font-size-lg: 1.1875rem;
        /* 19px */
        --font-size-xl: 1.375rem;
        /* 22px */
        --font-size-2xl: 1.75rem;
        /* 28px */
        --font-size-3xl: 2.25rem;
        /* 36px */
    }

    .app-container {
        padding: var(--spacing-sm);
    }

    .header h1 {
        font-size: var(--font-size-2xl);
    }

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

    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .results-header {
        flex-direction: column;
        align-items: stretch;
    }

    /* Make action buttons larger for mobile (min 44-48px touch target) */
    .action-buttons {
        width: 100%;
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn-secondary,
    .btn-whatsapp,
    .btn-outline {
        width: 100%;
        padding: 1rem var(--spacing-md);
        font-size: 1rem;
        /* 16px - larger for mobile */
        min-height: 48px;
        /* iOS/Android recommended touch target */
        justify-content: center;
    }

    .btn-primary {
        padding: 1.125rem var(--spacing-lg);
        font-size: 1.0625rem;
        /* 17px */
        min-height: 50px;
    }

    /* Make metric values and status larger and more readable */
    .metric-value .value {
        font-size: 2.5rem;
        /* Increased from 2rem */
        font-weight: 800;
    }

    .metric-value .unit {
        font-size: 1.25rem;
        /* Increased from 1.125rem */
    }

    .metric-status {
        padding: 0.75rem 1.25rem;
        /* Larger padding */
        font-size: 1.125rem;
        /* 18px - much larger text */
        font-weight: 700;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .metric-card h3 {
        font-size: 1.125rem;
        /* 18px */
        font-weight: 700;
    }

    /* Ensure gauges scale properly on mobile */
    .gauge-container {
        margin: var(--spacing-sm) 0;
        width: 100%;
        max-width: 100%;
        padding: 0;
        overflow: visible;
    }

    .gauge-container canvas {
        max-width: 85% !important;
        width: 85% !important;
        height: auto !important;
        display: block;
        margin: 0 auto;
    }

    /* Prevent horizontal scroll */
    .metric-card {
        padding: var(--spacing-md);
        overflow: hidden;
        max-width: 100%;
    }

    .results-grid {
        max-width: 100%;
        overflow: hidden;
    }

    /* Improve form inputs on mobile */
    input,
    select {
        padding: 1rem var(--spacing-sm);
        font-size: 1rem;
        /* 16px - prevents auto-zoom on iOS */
        min-height: 48px;
    }

    label {
        font-size: 0.9375rem;
        /* 15px */
        font-weight: 600;
    }

    /* Better spacing for mobile */
    .metric-card {
        padding: var(--spacing-md);
    }

    .form-card {
        padding: var(--spacing-md);
    }
}

/* ===== UTILITY CLASSES ===== */
.section {
    margin-bottom: var(--spacing-xl);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    /* Same as body bg */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    /* Higher index to cover everything */
}

/* Dark mode support if user prefers */
@media (prefers-color-scheme: dark) {
    .loading-overlay {
        background: #1a1a2e;
        /* Dark theme background */
    }
}

.loader {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
    /* Bouncy spin */
    margin-bottom: 20px;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

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

    100% {
        transform: rotate(360deg);
    }
}

.loading-overlay p {
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0.6;
    }
}

/* Protein Card Specifics */
.protein-display {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 180px;
}

.protein-icon {
    font-size: 4rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {

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

    50% {
        transform: translateY(-10px);
    }
}