/* 
 * Стили для SPA PWA приложения "Личный кабинет студента"
 * Версия с плитками и фиксированной шапкой
 */

/* ===== ОБЩИЕ СТИЛИ ===== */
:root {
    /* Цветовая палитра */
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cbc;
    --success-color: #51cf66;
    --warning-color: #fcc419;
    --danger-color: #ff6b6b;
    --info-color: #339af0;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-color: #adb5bd;
    --border-color: #e9ecef;
    
    /* Градиенты для плиток */
    --gradient-group: linear-gradient(135deg, #51cf66 0%, #40c057 100%);
    --gradient-chat: linear-gradient(135deg, #339af0 0%, #228be6 100%);
    --gradient-attendance: linear-gradient(135deg, #ffd43b 0%, #fcc419 100%);
    --gradient-payment: linear-gradient(135deg, #cc5de8 0%, #be4bdb 100%);
    
    /* Тени */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    
    /* Скругления */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    
    /* Анимации */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
    overflow-x: hidden;
}

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

.screen {
    display: none;
    flex: 1;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

.screen.hidden {
    display: none;
}

.hidden {
    display: none !important;
}

/* ===== ЭКРАН АВТОРИЗАЦИИ ===== */
#login-screen {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.login-header {
    padding: 40px 30px 20px;
    text-align: center;
    background: linear-gradient(135deg, #4a6fa5 0%, #6b8cbc 100%);
    color: white;
}

.login-logo {
    font-size: 3rem;
    margin-bottom: 15px;
    color: white;
}

.login-header h1 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.login-header p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.login-form {
    padding: 30px;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 14px 45px 14px 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: var(--transition-normal);
    background: #f8f9fa;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
}

.input-icon {
    position: absolute;
    right: 15px;
    top: 42px;
    color: var(--gray-color);
    font-size: 1.1rem;
}

.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #4a6fa5 0%, #6b8cbc 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.demo-credentials {
    margin-top: 25px;
    padding: 15px;
    background: #e7f5ff;
    border-radius: var(--radius-md);
    text-align: center;
    font-size: 0.9rem;
    color: #1864ab;
}

.demo-credentials p {
    margin-bottom: 5px;
}

.demo-credentials p:last-child {
    margin-bottom: 0;
}

.demo-credentials code {
    background: white;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: monospace;
}

.error-message {
    margin-top: 15px;
    padding: 12px;
    background: #ffe3e3;
    border-radius: var(--radius-md);
    color: #c92a2a;
    text-align: center;
    font-size: 0.9rem;
    animation: fadeIn var(--transition-normal);
}

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

/* ===== ОСНОВНОЙ ЭКРАН ПРИЛОЖЕНИЯ ===== */
/* Фиксированная шапка */
.app-header {
    background: white;
    padding: 15px 30px;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 90px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-left {
    flex: 1;
}

.header-left h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-center {
    flex: 2;
    text-align: center;
}

.student-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dark-color);
}

.header-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 15px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--light-color);
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.icon-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

.logout-btn {
    padding: 10px 20px;
    background: #ffe3e3;
    color: #c92a2a;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logout-btn:hover {
    background: #ffc9c9;
}

/* Основное содержимое */
.app-main {
    flex: 1;
    padding: 125px 30px 30px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* ===== СЕТКА ПЛИТОК ===== */
.tiles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .tiles-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
}

/* Общие стили плиток */
.tile {
    background: white;
    border-radius: var(--radius-xl);
    padding: 25px;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    min-height: 220px;
    position: relative;
    overflow: hidden;
}

.tile:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
}

/* Конкретные стили для каждой плитки */
.tile-group::before {
    background: var(--gradient-group);
}

.tile-chat::before {
    background: var(--gradient-chat);
}

.tile-attendance::before {
    background: var(--gradient-attendance);
}

.tile-payment::before {
    background: var(--gradient-payment);
}

/* Иконка плитки */
.tile-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.tile-group .tile-icon {
    background: var(--gradient-group);
}

.tile-chat .tile-icon {
    background: var(--gradient-chat);
}

.tile-attendance .tile-icon {
    background: var(--gradient-attendance);
}

.tile-payment .tile-icon {
    background: var(--gradient-payment);
}

/* Заголовок плитки */
.tile-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--dark-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Содержимое плитки */
.tile-content {
    flex: 1;
    margin-bottom: 15px;
}

.tile-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--dark-color);
}

.tile-subvalue {
    font-size: 1.1rem;
    color: var(--gray-color);
}

.tile-description {
    font-size: 0.95rem;
    color: var(--gray-color);
    line-height: 1.5;
    margin-bottom: 15px;
}

/* Статистика посещаемости */
.attendance-stats {
    display: flex;
    flex-direction: column;
    gap: 1px;
    margin-top: 10px;
}

.attendance-stats p {
    font-size: 0.9rem;
    color: var(--dark-color);
}

/* Статус оплаты */
.tile-status {
    font-size: 0.95rem;
    color: var(--success-color);
    font-weight: 500;
}

/* Кнопка чата */
.chat-btn {
    display: inline-block;
    padding: 10px 20px;
    background: white;
    color: var(--info-color);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: var(--transition-normal);
    border: 2px solid transparent;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: fit-content;
}

.chat-btn:hover {
    background: #f8f9fa;
    border-color: var(--info-color);
    transform: translateY(-2px);
}

/* Футер плитки */
.tile-footer {
    margin-top: auto;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.tile-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition-normal);
}

.tile:hover .tile-link {
    gap: 10px;
}

/* ===== ДЕТАЛЬНАЯ ИНФОРМАЦИЯ ПЛИТКИ ===== */
.tile-detail {
    background: white;
    border-radius: var(--radius-xl);
    padding: 30px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tile-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.tile-detail-header h3 {
    font-size: 1.5rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.close-detail {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-color);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.close-detail:hover {
    background: var(--light-color);
    color: var(--danger-color);
}

.tile-detail-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.detail-item {
    padding: 20px;
    background: #f8f9fa;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.detail-item-label {
    font-size: 0.9rem;
    color: var(--gray-color);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-item-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-color);
}

/* ===== РАСПИСАНИЕ ===== */
.schedule-section {
    background: white;
    border-radius: var(--radius-xl);
    padding: 30px;
    box-shadow: var(--shadow-md);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.week-switcher {
    display: flex;
    align-items: center;
    gap: 15px;
}

.week-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--dark-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.week-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: scale(1.1);
}

#current-week-label {
    font-weight: 600;
    color: var(--dark-color);
    min-width: 120px;
    text-align: center;
}

.schedule-container {
    position: relative;
}

.week-schedule {
    display: none;
}

.week-schedule.active {
    display: block;
    animation: fadeIn var(--transition-normal);
}

/* Стили для раскрывающегося списка дней */
.schedule-day {
    margin-bottom: 15px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.day-header {
    padding: 18px 20px;
    background: #f8f9fa;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.day-header:hover {
    background: #e9ecef;
}

.day-header.expanded {
    background: var(--primary-color);
    color: white;
    border-bottom-color: var(--border-color);
}

.day-header.expanded .day-name,
.day-header.expanded .day-date {
    color: white;
}

.day-name {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--dark-color);
}

.day-date {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.today-badge {
    background: var(--danger-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 10px;
}

.day-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.day-content.expanded {
    padding: 20px;
    max-height: 1000px;
}

/* Стили для занятий */
.lesson {
    display: grid;
    grid-template-columns: 100px 1fr auto;
    gap: 20px;
    padding: 15px;
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition-normal);
}

.lesson:hover {
    background: #f8f9fa;
    transform: translateX(5px);
}

.lesson-time {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lesson-start {
    font-weight: 600;
    color: var(--dark-color);
    font-size: 1.1rem;
}

.lesson-end {
    font-size: 0.9rem;
    color: var(--gray-color);
}

.lesson-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lesson-subject {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.lesson-details {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
    color: var(--gray-color);
}

.lesson-meta {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
}

.lesson-type {
    background: var(--light-color);
    color: var(--primary-color);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.lesson-room {
    color: var(--dark-color);
    font-weight: 500;
}

.no-lessons {
    text-align: center;
    padding: 40px;
    color: var(--gray-color);
    font-style: italic;
    font-size: 1.1rem;
}

/* ===== ФУТЕР ===== */
.app-footer {
    background: white;
    padding: 20px 30px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.footer-content p {
    color: var(--gray-color);
    font-size: 0.9rem;
}

#last-update {
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== УВЕДОМЛЕНИЯ ===== */
.notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 15px 25px;
    background: var(--dark-color);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 10000;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideInRight var(--transition-normal);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

.notification.error {
    background: var(--danger-color);
}

.notification.info {
    background: var(--info-color);
}

/* ===== АДАПТИВНОСТЬ ===== */
@media (max-width: 768px) {
    .app-header {
        padding: 15px;
    }
    
    .header-left h1 {
        font-size: 1rem;
        gap: 5px;
    }
    
    .student-name {
        font-size: 1rem;
    }
    
    .logout-btn span {
        display: none;
    }
    
    .logout-btn {
        padding: 10px;
    }
    
    .app-main {
        padding: 105px 15px 20px;
    }
    
    .tile {
        padding: 20px;
        min-height: 200px;
    }
    
    .tile-title {
        font-size: 0.8rem;
        margin-bottom: 10px;
    }

    .tile-detail-header h3 {
        font-size: 1.1rem;
    }

    .tile-content {
        margin-bottom: 10px;
    }

    .tile-link {
        font-size: 0.8rem;
    }
    
    .tile-value {
        font-size: 1rem;
    }

    .tile-description {
        font-size: 0.8rem;
        line-height: 1.3;
        margin-bottom: 10px;
    }

    .tile-status {
        font-size: 0.8rem;
        line-height: 1.3;
    }

    .attendance-stats p {
        font-size: 0.8rem;
        line-height: 1.3;
    }
    
    .schedule-section {
        padding: 20px;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .lesson {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .lesson-meta {
        align-items: flex-start;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .notification {
        left: 15px;
        right: 15px;
        bottom: 15px;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 0;
    }
    
    .login-header {
        padding: 30px 20px 15px;
    }
    
    .login-form {
        padding: 20px;
    }
    
    .tile-detail-content {
        grid-template-columns: 1fr;
    }
}