/* ========================================
   Reset & Base Styles - Проект 3: Премиум Управление Недвижимостью
   ======================================== */

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

:root {
    /* Colors - Монохромная, элегантная палитра */
    --color-primary: #111827;
    --color-primary-dark: #0F172A;
    --color-primary-light: #1F2937;
    --color-accent: #D4AF37;
    --color-accent-dark: #B8941F;
    --color-accent-bronze: #CD7F32;
    --color-accent-beige: #D7CCC8;
    
    --color-text: #E5E7EB;
    --color-text-light: #9CA3AF;
    --color-text-lighter: #6B7280;
    
    --color-bg: #111827;
    --color-bg-light: #1F2937;
    --color-bg-gray: #374151;
    --color-bg-dark: #0F172A;
    
    --color-border: #374151;
    --color-border-light: #4B5563;
    
    /* Typography */
    --font-family: 'Lora', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Playfair Display', 'Lora', serif;
    --font-size-base: 16px;
    --line-height-base: 1.7;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border radius - минимальные скругления */
    --radius-sm: 0;
    --radius-md: 0;
    --radius-lg: 0;
    --radius-xl: 0;
    
    /* Shadows - тонкие, элегантные */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    
    /* Transitions */
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    
    /* Container */
    --container-width: 1200px;
    --container-padding: 1.5rem;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ========================================
   Container
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.5px;
}

h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 400;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 400;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 400;
}

p {
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Buttons - тонкие рамки, элегантные
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 0.9375rem;
    font-weight: 300;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 0;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid var(--color-accent);
    text-align: center;
    font-family: var(--font-family);
    background: transparent;
    color: var(--color-accent);
}

.btn--primary {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn--primary:hover {
    background: var(--color-accent);
    color: var(--color-primary);
}

.btn--secondary {
    border-color: var(--color-text);
    color: var(--color-text);
}

.btn--secondary:hover {
    background: var(--color-text);
    color: var(--color-primary);
}

.btn--large {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}

/* ========================================
   Header
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.header--scrolled {
    border-bottom-color: var(--color-accent);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 0;
    gap: var(--spacing-lg);
}

.header__logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.logo__image {
    height: 60px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    filter: brightness(1.1);
}

/* Navigation */
.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav__link {
    font-weight: 300;
    color: var(--color-text);
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition-fast);
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: var(--transition);
}

.nav__link:hover {
    color: var(--color-accent);
}

.nav__link:hover::after {
    width: 100%;
}

.header__cta {
    flex-shrink: 0;
}

/* Burger Menu */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 24px;
    padding: 0;
}

.burger__line {
    width: 100%;
    height: 1px;
    background: var(--color-text);
    transition: var(--transition);
}

.burger--active .burger__line:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.burger--active .burger__line:nth-child(2) {
    opacity: 0;
}

.burger--active .burger__line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   Hero Section - полноэкранный с фоновым изображением
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
    background: var(--color-bg-dark);
}

.hero__background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(17, 24, 39, 0.7), rgba(17, 24, 39, 0.8)),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><rect fill="%23111827" width="1200" height="800"/><path d="M0,400 Q300,200 600,400 T1200,400" stroke="%23D4AF37" stroke-width="1" fill="none" opacity="0.1"/></svg>');
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    color: var(--color-text);
}

.hero__title {
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    font-weight: 400;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    font-weight: 300;
}

.hero__actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ========================================
   Section
   ======================================== */

.section {
    padding: var(--spacing-3xl) 0;
}

.section--gray {
    background-color: var(--color-bg-light);
}

.section--dark {
    background: var(--color-bg-dark);
    color: var(--color-text);
}

.section__header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.section__header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--color-accent);
}

.section__title {
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    line-height: 1.8;
    font-weight: 300;
}

.section--dark .section__subtitle {
    color: var(--color-text-light);
}

/* ========================================
   Services Section
   ======================================== */

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background: transparent;
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 100%;
    background: var(--color-accent);
    transform: scaleY(0);
    transition: var(--transition);
}

.service-card:hover {
    border-color: var(--color-accent);
    background: rgba(212, 175, 55, 0.05);
}

.service-card:hover::before {
    transform: scaleY(1);
}

.service-card__icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    padding: var(--spacing-sm);
}

.service-card__title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
    font-family: var(--font-heading);
}

.service-card__description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-weight: 300;
}

.service-card__link {
    color: var(--color-accent);
    font-weight: 300;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-size: 0.875rem;
}

.service-card__link:hover {
    gap: var(--spacing-sm);
}

/* ========================================
   Advantages Section
   ======================================== */

.advantages__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.advantage-card {
    background: transparent;
    padding: var(--spacing-xl);
    position: relative;
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.advantage-card:hover {
    border-color: var(--color-accent);
}

.advantage-card__number {
    font-size: 4rem;
    font-weight: 300;
    color: rgba(212, 175, 55, 0.2);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-heading);
    letter-spacing: 2px;
}

.advantage-card__title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
    font-family: var(--font-heading);
}

.advantage-card__description {
    color: var(--color-text-light);
    line-height: 1.8;
    font-weight: 300;
}

/* ========================================
   About Section
   ======================================== */

.about__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.about__content {
    max-width: 100%;
}

.about__text {
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
}

.about__text p {
    margin-bottom: var(--spacing-md);
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-xl);
}

.about__stat {
    text-align: center;
    position: relative;
}

.about__stat::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 1px;
    height: 100%;
    background: var(--color-border);
}

.about__stat:last-child::after {
    display: none;
}

.about__stat-number {
    font-size: 3rem;
    font-weight: 300;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-heading);
    letter-spacing: 2px;
}

.about__stat-label {
    color: var(--color-text-light);
    font-size: 0.875rem;
    font-weight: 300;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ========================================
   Form Section
   ======================================== */

.form-section__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.form-section__title {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.form-section__subtitle {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    font-weight: 300;
}

.form-section__benefits {
    list-style: none;
}

.form-section__benefit {
    padding: var(--spacing-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--spacing-lg);
    font-weight: 300;
}

.form-section__benefit::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 300;
    font-size: 1.25rem;
}

/* Form */
.form {
    background: transparent;
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 300;
    color: var(--color-text-light);
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form__input,
.form__select,
.form__textarea {
    width: 100%;
    padding: 0.875rem 0;
    font-family: inherit;
    font-size: 1rem;
    border: none;
    border-bottom: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text);
    transition: var(--transition);
    font-weight: 300;
}

.form__input::placeholder,
.form__textarea::placeholder {
    color: var(--color-text-lighter);
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
    outline: none;
    border-bottom-color: var(--color-accent);
}

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

.form__submit {
    width: 100%;
    margin-bottom: var(--spacing-md);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.form__submit:hover {
    background: var(--color-accent);
    color: var(--color-primary);
}

.form__privacy {
    font-size: 0.75rem;
    color: var(--color-text-lighter);
    text-align: center;
    font-weight: 300;
}

.form__privacy-link {
    color: var(--color-accent);
    text-decoration: underline;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer__inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__description {
    margin-top: var(--spacing-md);
    color: var(--color-text-lighter);
    line-height: 1.8;
    font-weight: 300;
    font-size: 0.875rem;
}

.footer__title {
    color: var(--color-text);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    font-weight: 400;
    font-family: var(--font-heading);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer__contacts,
.footer__menu {
    list-style: none;
}

.footer__contact,
.footer__menu-item {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
    font-weight: 300;
    font-size: 0.875rem;
}

.footer__link {
    color: var(--color-text-light);
    transition: var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-accent);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
}

.footer__legal {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-lighter);
    font-weight: 300;
    letter-spacing: 0.5px;
}

.footer__legal p {
    margin-bottom: var(--spacing-xs);
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 1199px) {
    :root {
        --container-width: 960px;
    }
    
    .about__inner,
    .form-section__inner {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .about__stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --spacing-3xl: 3rem;
        --spacing-2xl: 2rem;
    }
    
    /* Header */
    .header__inner {
        padding: 1rem 0;
    }
    
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    
    .nav--active {
        max-height: 500px;
        padding: var(--spacing-md) var(--container-padding);
    }
    
    .nav__list {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .header__cta {
        display: none;
    }
    
    .burger {
        display: flex;
    }
    
    /* Hero */
    .hero {
        min-height: 80vh;
        padding: 6rem 0 3rem;
    }
    
    .hero__actions {
        flex-direction: column;
    }
    
    .hero__actions .btn {
        width: 100%;
    }
    
    /* Sections */
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section__header {
        margin-bottom: var(--spacing-xl);
    }
    
    /* Grids */
    .services__grid,
    .advantages__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .about__stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .about__stat::after {
        display: none;
    }
    
    /* Footer */
    .footer__inner {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero__title {
        font-size: 1.75rem;
    }
    
    .section__title {
        font-size: 1.5rem;
    }
    
    .service-card,
    .advantage-card {
        padding: var(--spacing-md);
    }
    
    .form {
        padding: var(--spacing-md);
    }
}

/* ========================================
   Page Header (для внутренних страниц)
   ======================================== */

.page-header {
    padding: 8rem 0 var(--spacing-xl);
    text-align: center;
    background: var(--color-bg-dark);
    color: var(--color-text);
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--color-accent);
}

.page-header__title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    font-weight: 400;
}

.page-header__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
    font-weight: 300;
}

/* ========================================
   Services Detail Page
   ======================================== */

.services-detail__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.service-detail {
    background: transparent;
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.service-detail:hover {
    border-color: var(--color-accent);
}

.service-detail__icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    padding: var(--spacing-sm);
}

.service-detail__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
    font-family: var(--font-heading);
}

.service-detail__content {
    color: var(--color-text-light);
    line-height: 1.9;
    font-weight: 300;
}

.service-detail__content h3 {
    color: var(--color-text);
    font-size: 1.125rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
    font-family: var(--font-heading);
}

.service-detail__list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.service-detail__list li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light);
    font-weight: 300;
}

.service-detail__list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 300;
    font-size: 1.25rem;
    line-height: 1;
}

/* ========================================
   CTA Section
   ======================================== */

.cta-section {
    background: var(--color-bg-dark);
    color: var(--color-text);
    text-align: center;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.cta-section__title {
    color: var(--color-text);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.cta-section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
}

.cta-section__actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-section__actions .btn--secondary {
    border-color: var(--color-text);
    color: var(--color-text);
}

.cta-section__actions .btn--secondary:hover {
    background: var(--color-text);
    color: var(--color-primary);
}

/* Active nav link */
.nav__link--active {
    color: var(--color-accent);
    font-weight: 300;
}

.nav__link--active::after {
    width: 100%;
}

@media (max-width: 768px) {
    .services-detail__grid {
        grid-template-columns: 1fr;
    }
    
    .cta-section__actions {
        flex-direction: column;
    }
    
    .cta-section__actions .btn {
        width: 100%;
    }
}