:root {
    --primary: #1abc9c;
    --secondary: #34495e;
    --accent: #e74c3c;
    --light: #34495e;
    --dark: #ecf0f1;
    --card-bg: #2c3e50;
    --text: #ecf0f1;
    --text-light: #bdc3c7;
    --border: #7f8c8d;
    --shadow: rgba(0, 0, 0, 0.3);
    --success: #2ecc71;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--text);
    transition: var(--transition);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    max-width: 1200px;
    width: 100%;
    transition: margin-top 0.3s ease;
}

/* Офлайн индикатор */
.offline-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--light);
    color: white;
    text-align: center;
    padding: 8px 0;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Сдвигаем контейнер вниз когда показан офлайн индикатор */
.container.offline-mode {
    margin-top: 40px;
}

/* PWA стили для fullscreen режима */
@media all and (display-mode: standalone) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* iOS Safari status bar */
@media all and (-webkit-min-device-pixel-ratio: 0) and (min-color-index: 0) {
    .container {
        padding-top: 20px;
    }
}

/* SVG иконки */
.icon {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1); /* Делает иконки белыми */
}

.logo-icon {
    width: 60px;
    height: 60px;
    filter: brightness(0) saturate(100%) invert(70%) sepia(78%) saturate(1665%) hue-rotate(126deg) brightness(96%) contrast(85%); /* Делает иконку цвета #1abc9c */
}

.nav-icon {
    width: 20px;
    height: 20px;
    filter: brightness(0) invert(1); /* Белые иконки */
}

/* Splash Screen */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeOut 0.5s ease 3s forwards;
}

.logo {
    width: 120px;
    height: 120px;
    background-color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: pulse 2s infinite;
}

.app-name {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.header-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
}

/* Slider */
.slider-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow);
}

.slider {
    display: flex;
    transition: transform 0.5s ease;
}

.slide {
    min-width: 100%;
    padding: 25px;
    background-color: var(--card-bg);
    border-radius: 15px;
}

.slide-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.slide-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.slide-icon .icon {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1); /* Белые иконки */
}

.slide-title {
    font-size: 1.4rem;
    font-weight: 600;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-light);
}

.input-group input {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background-color: var(--card-bg);
    color: var(--text);
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 188, 156, 0.2);
}

.calculate-btn {
    width: 100%;
    padding: 15px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.calculate-btn:hover {
    background-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.result {
    margin-top: 25px;
    padding: 20px;
    background-color: rgba(46, 204, 113, 0.1);
    border-radius: 10px;
    border-left: 4px solid var(--success);
    display: none;
}

.result.show {
    display: block;
    animation: fadeIn 0.5s ease;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--success);
    margin-top: 10px;
}

/* Navigation Arrows */
.slider-nav {
    display: flex;
    justify-content: center;
    margin-top: 20px;
    gap: 15px;
}

.nav-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 10px var(--shadow);
}

/* Hover-эффект только для устройств с мышью */
@media (hover: hover) {
    .nav-btn:hover {
        background-color: var(--primary);
        transform: translateY(-3px);
    }
    
    .nav-btn:hover .nav-icon {
        filter: brightness(0) invert(1); /* Остаются белыми при hover */
    }
}

/* Эффект при нажатии для всех устройств */
.nav-btn:active {
    transform: translateY(0);
    background-color: var(--primary);
}

.nav-btn:active .nav-icon {
    filter: brightness(0) invert(1); /* Остаются белыми при active */
}

/* Indicators */
.indicators {
    display: flex;
    justify-content: center;
    margin-top: 20px;
    gap: 10px;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border);
    transition: var(--transition);
}

.indicator.active {
    background-color: var(--primary);
    transform: scale(1.2);
}

/* Animations */
@keyframes fadeOut {
    from { opacity: 1; visibility: visible; }
    to { opacity: 0; visibility: hidden; }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .header-title {
        font-size: 1.5rem;
        margin: 0 auto;
    }
    
    .slide {
        padding: 20px;
    }
    
    .slide-title {
        font-size: 1.2rem;
    }
    
    .app-name {
        font-size: 2rem;
    }
    
    .logo {
        width: 100px;
        height: 100px;
    }
    
    .logo-icon {
        width: 50px;
        height: 50px;
    }
    
    .offline-indicator {
        font-size: 0.8rem;
        padding: 6px 0;
    }
    
    .container.offline-mode {
        margin-top: 35px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 15px;
    }
    
    header {
        padding: 15px 0;
    }
    
    .header-title {
        font-size: 1.3rem;
        margin: 0 auto;
    }
    
    .slide {
        padding: 15px;
    }
    
    .slide-title {
        font-size: 1.1rem;
    }
    
    .input-group label {
        font-size: 0.9rem;
    }
    
    .input-group input {
        padding: 12px;
        font-size: 0.95rem;
    }
    
    .calculate-btn {
        padding: 12px;
        font-size: 1rem;
    }
    
    .nav-btn {
        width: 45px;
        height: 45px;
    }
    
    .offline-indicator {
        font-size: 0.75rem;
        padding: 5px 0;
    }
    
    .container.offline-mode {
        margin-top: 30px;
    }
}