:root {
    --yellow-primary: #F5A623;
    --yellow-dark: #E69500;
    --yellow-light: #FFB84D;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    line-height: 1.5;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Modern Navigation - строгий минимализм */
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    height: 70px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    text-transform: uppercase;
}

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

.theme-toggle {
    background: transparent;
    border: 1px solid;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--yellow-primary);
    border-color: var(--yellow-primary);
}

.logout-btn {
    padding: 0.5rem 1.25rem;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
    border: 1px solid;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.logout-btn:hover {
    background: var(--yellow-primary);
    border-color: var(--yellow-primary);
    color: #000;
}

.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
}

/* Welcome Section - строго */
.welcome-section {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.welcome-section h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.progress-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--yellow-primary);
    color: #000;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Dashboard Grid - строгая сетка */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Cards - минимализм, острые углы */
.card {
    border: 1px solid;
    padding: 1.5rem;
    transition: var(--transition);
    background: transparent;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-title::before {
    content: '';
    width: 3px;
    height: 18px;
    background: var(--yellow-primary);
    display: inline-block;
}

/* Payment Section - строгий */
.payment-status {
    text-align: left;
    padding: 0;
}

.payment-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.6;
    margin-bottom: 0.5rem;
}

.payment-date {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.payment-badge {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

/* Nutrition Section - строгая таблица */
.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.nutrition-item {
    text-align: left;
    padding: 0;
    border-left: 2px solid var(--yellow-primary);
    padding-left: 1rem;
}

.nutrition-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    opacity: 0.6;
    margin-bottom: 0.25rem;
}

.nutrition-value {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nutrition-unit {
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.5;
    margin-left: 0.25rem;
}

/* Measurements Form - строгие формы */
.measurements-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid;
    font-family: 'Inter', monospace;
    font-size: 0.875rem;
    transition: var(--transition);
    background: transparent;
    border-radius: 0;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--yellow-primary);
}

.btn-primary {
    padding: 0.875rem;
    border: none;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: var(--yellow-primary);
    color: #000;
}

.btn-primary:hover {
    background: var(--yellow-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    padding: 0.875rem;
    border: 1px solid;
    background: transparent;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-secondary:hover {
    background: rgba(245, 166, 35, 0.1);
}

/* Call Items - строгий список */
.calls-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.call-item {
    padding: 1rem;
    border-left: 2px solid var(--yellow-primary);
    transition: var(--transition);
}

.call-item:hover {
    transform: translateX(4px);
}

.call-date {
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.call-time {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-top: 0.25rem;
    font-family: monospace;
}

.call-notes {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid;
    opacity: 0.8;
}

.add-call-btn {
    margin-top: 1rem;
    width: 100%;
    background: transparent;
    border: 1px solid;
}

/* Chart Container */
.chart-container {
    margin: 1.5rem 0;
    padding: 1.5rem;
    border: 1px solid;
}

canvas {
    max-height: 350px;
    width: 100% !important;
}

/* Login Page - строгий */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    max-width: 380px;
    width: 100%;
    padding: 2rem;
    border: 1px solid;
}

.login-header {
    text-align: left;
    margin-bottom: 2rem;
}

.login-logo {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 0.5rem;
}

.login-header p {
    font-size: 0.875rem;
    opacity: 0.7;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.error-message {
    padding: 0.75rem;
    border-left: 3px solid #ff4444;
    background: rgba(255, 68, 68, 0.1);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.demo-info {
    margin-top: 1.5rem;
    padding: 1rem;
    border: 1px solid;
    text-align: left;
}

.demo-info small {
    font-size: 0.75rem;
    display: block;
    line-height: 1.6;
}

.demo-info strong {
    color: var(--yellow-primary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    max-width: 450px;
    width: 90%;
    padding: 2rem;
    border: 1px solid;
    background: var(--bg-primary);
}

.modal-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.modal-buttons button {
    flex: 1;
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.stat-item {
    text-align: left;
    border-left: 2px solid var(--yellow-primary);
    padding-left: 1rem;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.6;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

.stat-change {
    font-size: 0.7rem;
    margin-top: 0.25rem;
}

.stat-change.positive {
    color: #4caf50;
}

.stat-change.negative {
    color: #ff4444;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .card {
        padding: 1.25rem;
    }
    
    .main-nav {
        padding: 0 1rem;
        height: 60px;
    }
    
    .brand-name {
        font-size: 1rem;
    }
    
    .welcome-section h1 {
        font-size: 1.25rem;
    }
    
    .payment-date {
        font-size: 1.5rem;
    }
    
    .nutrition-value {
        font-size: 1.25rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
}

/* Utility Classes */
.text-muted {
    opacity: 0.6;
    font-size: 0.75rem;
}

.divider {
    height: 1px;
    background: currentColor;
    opacity: 0.1;
    margin: 1rem 0;
}

/* Scrollbar - строгий */
::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--yellow-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--yellow-dark);
}