/* ===== CSS ПЕРЕМЕННЫЕ ===== */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    
    /* Background Colors */
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-header: #1e293b;
    --bg-footer: #1e293b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    --gradient-dark: linear-gradient(135deg, var(--bg-header), #334155);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ===== RESET И БАЗОВЫЕ СТИЛИ ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-body);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== КОНТЕЙНЕР ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== СТРАНИЦА ===== */
.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
.header {
    background: var(--gradient-dark);
    color: var(--text-white);
    padding: var(--space-xl) 0;
    text-align: center;
}

.header__content {
    max-width: 600px;
    margin: 0 auto;
}

.header__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.header__subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ===== НАВИГАЦИЯ ===== */
.nav {
    background: var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.nav__list {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
}

.nav__item {
    margin: 0;
}

.nav__link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-white);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
}

.nav__link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.nav__item--active .nav__link {
    background: rgba(255, 255, 255, 0.2);
    font-weight: 600;
}

/* ===== ОСНОВНОЙ КОНТЕНТ ===== */
.main {
    flex: 1;
    padding: var(--space-2xl) 0;
}

/* ===== ЗАГОЛОВОК СЕКЦИИ ===== */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--space-2xl);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: var(--space-md) auto 0;
    border-radius: var(--radius-sm);
}

/* ===== СЕКЦИЯ HERO ===== */
.hero {
    margin-bottom: var(--space-2xl);
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    align-items: center;
    background: var(--bg-card);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.hero__image {
    text-align: center;
}

.hero__photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

.hero__greeting {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.hero__description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.hero__button {
    font-size: 1.1rem;
    padding: var(--space-md) var(--space-xl);
}

/* ===== СЕКЦИЯ НАВЫКОВ ===== */
.skills {
    margin-bottom: var(--space-2xl);
}

.skills__grid {
    display: grid;
    gap: var(--space-lg);
    max-width: 600px;
    margin: 0 auto;
}

.skill {
    background: var(--bg-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.skill__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.skill__name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.skill__percent {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.skill__progress {
    height: 10px;
    background: #e2e8f0;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.skill__progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    transition: width 1s ease-in-out;
}

/* ===== СЕКЦИЯ ПРОЕКТОВ ===== */
.projects-preview {
    margin-bottom: var(--space-2xl);
}

.projects-preview__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

/* ===== КАРТОЧКА ПРОЕКТА ===== */
.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-card__image {
    height: 200px;
    overflow: hidden;
}

.project-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-card__image img {
    transform: scale(1.05);
}

.project-card__content {
    padding: var(--space-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-card__title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-card__description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    flex: 1;
}

.project-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

/* ===== КОМПОНЕНТ TAG ===== */
.tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--primary-light);
    color: var(--text-white);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===== КОМПОНЕНТ BUTTON ===== */
.button {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    font-size: 1rem;
}

.button--primary {
    background: var(--primary-color);
    color: var(--text-white);
}

.button--primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.button--outline:hover {
    background: var(--primary-color);
    color: var(--text-white);
    transform: translateY(-2px);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--gradient-dark);
    color: var(--text-white);
    padding: var(--space-xl) 0;
    margin-top: auto;
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer__copyright {
    margin: 0;
    opacity: 0.9;
}

.footer__links {
    display: flex;
    gap: var(--space-lg);
}

.footer__link {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer__link:hover {
    color: var(--text-white);
    transform: translateY(-1px);
}

/* ===== АДАПТИВНЫЙ ДИЗАЙН ===== */

/* Планшеты (768px и меньше) */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .header__title {
        font-size: 2rem;
    }
    
    .header__subtitle {
        font-size: 1rem;
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--space-xs);
        align-items: center;
        padding: var(--space-sm) 0;
    }
    
    .nav__link {
        width: 100%;
        text-align: center;
    }
    
    .hero__content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-lg);
        padding: var(--space-lg);
    }
    
    .hero__photo {
        width: 150px;
        height: 150px;
    }
    
    .hero__greeting {
        font-size: 1.5rem;
    }
    
    .hero__description {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .projects-preview__grid {
        grid-template-columns: 1fr;
    }
    
    .footer__content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer__links {
        justify-content: center;
    }
}

/* Мобильные устройства (480px и меньше) */
@media (max-width: 480px) {
    :root {
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
    }
    
    .header__title {
        font-size: 1.75rem;
    }
    
    .header__subtitle {
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .hero__greeting {
        font-size: 1.3rem;
    }
    
    .hero__description {
        font-size: 0.95rem;
    }
    
    .button {
        width: 100%;
    }
    
    .skill__name,
    .skill__percent {
        font-size: 1rem;
    }
    
    .project-card__title {
        font-size: 1.1rem;
    }
    
    .project-card__description {
        font-size: 0.9rem;
    }
    
    .nav__list {
        padding: var(--space-xs) 0;
    }
    
    .footer__links {
        flex-direction: column;
        align-items: center;
        gap: var(--space-sm);
    }
}

/* Большие экраны (1400px и больше) */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
    
    .header__title {
        font-size: 3rem;
    }
    
    .hero__greeting {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
}

/* ===== СТИЛИ ДЛЯ СТРАНИЦЫ ПРОЕКТОВ ===== */
.projects__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.projects__filters {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.filter {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-card);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
}

.filter:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.filter--active {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.project-card__button {
    width: 100%;
    margin-top: auto;
}

/* ===== СТИЛИ ДЛЯ СТРАНИЦЫ ДНЕВНИКА ===== */
.timeline {
    max-width: 800px;
    margin: 0 auto var(--space-2xl);
}

.timeline__item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: var(--transition);
}

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

.timeline__item::before {
    content: '';
    position: absolute;
    left: 170px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e2e8f0;
}

.timeline__date {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.timeline__content {
    position: relative;
}

.timeline__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.timeline__description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

.timeline__status {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.timeline__status--completed {
    background: var(--success-color);
    color: white;
}

.timeline__status--in-progress {
    background: var(--warning-color);
    color: white;
}

.timeline__status--planned {
    background: var(--secondary-color);
    color: white;
}

/* Courses Section */
.courses {
    margin-bottom: var(--space-2xl);
}

.courses__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.courses__grid {
    display: grid;
    gap: var(--space-lg);
    max-width: 600px;
    margin: 0 auto;
}

.course {
    background: var(--bg-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.course__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.course__name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.course__percent {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.course__progress {
    height: 8px;
    background: #e2e8f0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.course__progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    transition: width 1s ease-in-out;
}

/* Add Entry Form */
.add-entry {
    background: var(--bg-card);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    margin: 0 auto;
}

.add-entry__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.add-entry__form {
    display: grid;
    gap: var(--space-lg);
}

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

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea {
    padding: var(--space-md);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    color: var(--text-primary);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== СТИЛИ ДЛЯ СТРАНИЦЫ КОНТАКТОВ ===== */
.contacts__content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-form {
    background: var(--bg-card);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.form {
    display: grid;
    gap: var(--space-lg);
}

.form__group {
    display: flex;
    flex-direction: column;
}

.form__label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.form__input,
.form__textarea {
    padding: var(--space-md);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    color: var(--text-primary);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

.form__button {
    font-size: 1.1rem;
    padding: var(--space-md) var(--space-lg);
}

.contact-info {
    background: var(--bg-card);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    height: fit-content;
}

.contact-info__title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.contact-info__items {
    display: grid;
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: #f8fafc;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-item__icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-item__content {
    flex: 1;
}

.contact-item__title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.contact-item__value {
    color: var(--text-secondary);
}

/* ===== АДАПТИВНОСТЬ ДЛЯ ДОПОЛНИТЕЛЬНЫХ СТРАНИЦ ===== */
@media (max-width: 768px) {
    .projects__header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .projects__filters {
        justify-content: center;
    }
    
    .projects__grid {
        grid-template-columns: 1fr;
    }
    
    .timeline__item {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .timeline__item::before {
        display: none;
    }
    
    .contacts__content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .filter {
        flex: 1 1 auto;
        min-width: 100px;
        text-align: center;
    }
    
    .add-entry,
    .contact-form,
    .contact-info {
        padding: var(--space-lg);
    }
}