/* Layout and Grid System */

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    transition: all var(--transition-fast);
    width: 100%;
}

.header.is-scrolled {
    background-color: rgba(255, 255, 255, 0.96);
    backdrop-filter: saturate(140%) blur(8px);
    box-shadow: 0 1px 0 #e5e7eb;
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.header__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.header__logo:hover {
    transform: scale(1.05);
}

.header__nav {
    display: none;
}

@media (min-width: 1024px) {
    .header__nav {
        display: block;
    }
}

.header__menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-8);
}

.header__item {
    position: relative;
}

.header__link {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    font-weight: 600;
    color: #0f172a;
    text-decoration: none;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.header__link:hover {
    color: #0ba470;
    background-color: var(--color-gray-100);
}

.header__link:focus-visible {
    outline: 2px solid #0ba470;
    outline-offset: 2px;
    border-radius: 6px;
}

.header__submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    list-style: none;
    margin: 0;
    padding: var(--space-2) 0;
}

.header__item:hover .header__submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.header__submenu li {
    margin: 0;
}

.header__submenu a {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--color-gray-700);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.header__submenu a:hover {
    color: var(--color-primary);
    background-color: var(--color-gray-100);
}

/* Burger Menu */
.header__burger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
}

@media (min-width: 1024px) {
    .header__burger {
        display: none;
    }
}

.header__burger span {
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.header__burger[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.header__burger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.header__burger[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Container */
.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-8);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-12);
    }
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid--2 {
    grid-template-columns: 1fr;
}

.grid--3 {
    grid-template-columns: 1fr;
}

.grid--4 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid--2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid--3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid--4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

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

.flex--center {
    align-items: center;
    justify-content: center;
}

.flex--between {
    justify-content: space-between;
}

.flex--wrap {
    flex-wrap: wrap;
}

.flex--gap {
    gap: var(--space-4);
}

.flex--gap-sm {
    gap: var(--space-2);
}

.flex--gap-lg {
    gap: var(--space-6);
}

/* Spacing Utilities */
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }
.mb-20 { margin-bottom: var(--space-20); }
.mb-24 { margin-bottom: var(--space-24); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mt-20 { margin-top: var(--space-20); }
.mt-24 { margin-top: var(--space-24); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-12 { padding: var(--space-12); }
.p-16 { padding: var(--space-16); }
.p-20 { padding: var(--space-20); }
.p-24 { padding: var(--space-24); }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }

@media (max-width: 767px) {
    .hidden-mobile { display: none; }
}

@media (min-width: 768px) {
    .hidden-tablet { display: none; }
}

@media (min-width: 1024px) {
    .hidden-desktop { display: none; }
}

/* Section */
.section {
    padding: var(--space-20) 0;
}

.section--light {
    background-color: var(--color-gray-100);
}

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

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--dark h5,
.section--dark h6 {
    color: var(--color-white);
}

.section__content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.section__title {
    font-family: var(--font-heading);
    font-weight: 800;     /* ExtraBold */
    margin-bottom: var(--space-6);
    text-align: center;
}

.section__subtitle {
    font-family: var(--font-caption);
    font-weight: 300;     /* Light */
    font-size: var(--text-xl);
    color: var(--color-gray-600);
    margin-bottom: var(--space-8);
    text-align: center;
}

.section--dark .section__subtitle {
    color: var(--color-gray-300);
}

.section__text {
    margin-bottom: var(--space-8);
}

.section__text p {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
}

/* Hero Section */
.hero {
    padding: var(--space-32) 0;
    position: relative;
    overflow: hidden;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero__title {
    font-family: var(--font-heading);
    font-weight: 800;     /* ExtraBold */
    font-size: var(--text-6xl);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-6);
    color: var(--color-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.hero__subtitle {
    font-family: var(--font-caption);
    font-weight: 300;     /* Light */
    font-size: var(--text-xl);
    line-height: var(--leading-relaxed);
    color: var(--color-white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    margin-bottom: var(--space-8);
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 767px) {
    .hero {
        padding: var(--space-20) 0;
    }
    
    .hero__title {
        font-size: var(--text-4xl);
    }
    
    .hero__subtitle {
        font-size: var(--text-lg);
    }
    
    .hero__actions {
        flex-direction: column;
        align-items: center;
    }
}

/* Materials Grid */
.materials-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .materials-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Focus Grid */
.focus-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

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

@media (min-width: 1024px) {
    .focus-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Mobile menu styles */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    z-index: var(--z-modal);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
    padding: var(--space-20) var(--space-6) var(--space-6);
    display: none;
    opacity: 0;
    visibility: hidden;
}

.mobile-menu--open {
    transform: translateX(0);
    display: block;
    opacity: 1;
    visibility: visible;
}

.mobile-menu__close {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--color-gray-700);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-menu__close:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.mobile-menu__nav {
    margin-top: var(--space-8);
}

.mobile-menu__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-menu__item {
    margin-bottom: var(--space-1);
    border-bottom: 1px solid var(--color-gray-200);
}

.mobile-menu__item:last-child {
    border-bottom: none;
}

.mobile-menu__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-gray-700);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    position: relative;
}

.mobile-menu__arrow {
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.mobile-menu__item:has(.mobile-menu__submenu--open) .mobile-menu__arrow {
    transform: rotate(90deg);
}

.mobile-menu__link:hover {
    color: var(--color-primary);
    background-color: var(--color-gray-100);
}

.mobile-menu__submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    margin: var(--space-2) var(--space-4);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-normal) ease-out;
}

.mobile-menu__submenu--open {
    max-height: 500px;
}

.mobile-menu__submenu .mobile-menu__link {
    font-size: var(--text-base);
    padding: var(--space-3) var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.mobile-menu__submenu .mobile-menu__link:last-child {
    border-bottom: none;
}

.mobile-menu__submenu .mobile-menu__link:hover {
    background-color: var(--color-gray-100);
}

@media (min-width: 1024px) {
    .mobile-menu {
        display: none !important;
    }
}

/* Footer */
.footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: var(--space-20) 0 var(--space-8);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .footer__content {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer__title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--color-white);
}

.footer__menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer__menu li {
    margin-bottom: var(--space-2);
}

.footer__menu a {
    color: var(--color-gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__menu a:hover {
    color: var(--color-white);
}

.footer__contact {
    margin-bottom: var(--space-6);
}

.footer__contact p {
    margin-bottom: var(--space-2);
    color: var(--color-gray-300);
}

.footer__contact a {
    color: var(--color-gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__contact a:hover {
    color: var(--color-white);
}

.footer__social {
    display: flex;
    gap: var(--space-4);
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-gray-800);
    border-radius: var(--radius-full);
    color: var(--color-gray-300);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer__social-link:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer__bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
}

@media (min-width: 768px) {
    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }
}

.footer__copyright {
    color: var(--color-gray-400);
    margin: 0;
}

.footer__privacy {
    color: var(--color-gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__privacy:hover {
    color: var(--color-white);
}