:root {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-1: #3b82f6;
    /* Blue */
    --accent-2: #8b5cf6;
    /* Violet */
    --accent-3: #10b981;
    /* Emerald */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --card-bg: rgba(15, 23, 42, 0.6);
    --input-bg: rgba(15, 23, 42, 0.8);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-radius-lg: 24px;
    --border-radius-md: 16px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    position: relative;
    overflow-x: hidden;
}

.blob {
    position: absolute;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.6;
    animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-1) 0%, transparent 70%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
    animation-delay: -5s;
}

.blob-3 {
    top: 40%;
    left: 40%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-3) 0%, transparent 70%);
    animation-delay: -10s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -50px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }

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

.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--glass-shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 650px;
    animation: fadeInContainer 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

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

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

header p {
    color: var(--text-secondary);
    font-weight: 300;
    font-size: 1.1rem;
}

/* Auth Section */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.auth-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.auth-wrapper {
    width: 100%;
    max-width: 450px;
    position: relative;
    margin: 0 1rem;
}

.auth-toggle {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.auth-toggle span {
    color: var(--accent-1);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.auth-toggle span:hover {
    color: var(--accent-2);
    text-decoration: underline;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    text-align: center;
    margin-top: 0.5rem;
}

input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
}

input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--accent-1);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.app-header-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

.btn-text {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.btn-text:hover {
    color: var(--accent-1);
}

form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

label {
    font-size: 0.95rem;
    font-weight: 500;
    color: #e2e8f0;
}

.input-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.input-row-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 550px) {

    .input-row,
    .input-row-2 {
        grid-template-columns: 1fr;
    }
}

.radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.radio-card {
    position: relative;
    cursor: pointer;
}

.radio-card input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.card-content {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.radio-card:hover .card-content {
    background: rgba(30, 41, 59, 0.9);
    color: var(--text-primary);
}

.radio-card input:checked~.card-content {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-1);
    color: var(--text-primary);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.input-wrapper,
.select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

input[type="number"],
select {
    width: 100%;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

input[type="number"] {
    padding-right: 3.5rem;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-1);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.unit {
    position: absolute;
    right: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    pointer-events: none;
}

.height-imperial-wrapper {
    display: flex;
    gap: 0.5rem;
}

.hidden {
    display: none !important;
}

.btn-calculate {
    position: relative;
    width: 100%;
    padding: 1.25rem;
    margin-top: 1rem;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border: none;
    border-radius: var(--border-radius-md);
    color: white;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: var(--transition);
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.4);
}

.btn-calculate:active {
    transform: translateY(1px);
}

.btn-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 60%);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.3s, transform 0.5s;
    pointer-events: none;
}

.btn-calculate:hover .btn-glow {
    opacity: 1;
    transform: scale(1);
    animation: rotate 4s linear infinite;
}

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

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

.results-section {
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--glass-border);
    animation: fadeIn 0.5s ease-out;
}

.results-section.hidden {
    display: none;
}

.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.divider {
    height: 4px;
    width: 50px;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    margin: 0 auto;
    border-radius: 2px;
}

.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (max-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}

.metric-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
}

.metric-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.metric-card.primary {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-color: rgba(139, 92, 246, 0.3);
}

.metric-card h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.metric-card.primary .value {
    background: linear-gradient(135deg, #93c5fd, #c4b5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.metric-card .unit {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.insights-section {
    margin-bottom: 2rem;
}

.insights-section h3,
.goals-section h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 1rem;
    text-align: center;
}

.insights-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 550px) {
    .insights-grid {
        grid-template-columns: 1fr;
    }
}

.insight-summary {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    padding: 1.25rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
    text-align: center;
}

.insight-summary strong {
    color: var(--accent-1);
    font-weight: 600;
}

.goals-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 550px) {
    .goals-grid {
        grid-template-columns: 1fr;
    }
}

.goal-card {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    transition: var(--transition);
}

.goal-card:hover {
    background: rgba(30, 41, 59, 1);
}

.goal-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.goal-header h4 {
    font-size: 0.9rem;
    font-weight: 500;
}

.goal-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.goal-value {
    font-size: 1.1rem;
    font-weight: 600;
}

.goal-value span {
    font-size: 1.25rem;
}

.indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.bmi-underweight {
    background-color: var(--accent-1);
}

.bmi-normal {
    background-color: var(--success);
}

.bmi-overweight {
    background-color: var(--warning);
}

.bmi-obese {
    background-color: var(--danger);
}

.loss .indicator {
    background-color: var(--success);
}

.extreme-loss .indicator {
    background-color: var(--warning);
}

.gain .indicator {
    background-color: var(--accent-2);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
}

/* Food Recommendations Section */
.foods-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
}

.foods-section h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    text-align: center;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.food-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.tab-btn.active {
    background: rgba(59, 130, 246, 0.2);
    color: var(--text-primary);
    border-color: var(--accent-1);
}

.food-menu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 550px) {
    .food-menu-grid {
        grid-template-columns: 1fr;
    }
}

.food-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    padding: 1.25rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.food-card:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.food-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.food-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.food-calories {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-1);
    background: rgba(59, 130, 246, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
}

.food-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 0.75rem;
    flex-grow: 1;
}

.food-macros {
    display: flex;
    gap: 0.75rem;
    font-size: 0.75rem;
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.75rem;
}

.macro-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.macro-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.macro-p .macro-dot {
    background-color: var(--success);
}

.macro-c .macro-dot {
    background-color: var(--accent-1);
}

.macro-f .macro-dot {
    background-color: var(--warning);
}