/**
 * KARASI MİMARLIK
 * Global Stylesheet
 * 
 * Palette: Monochrome (Black, White, Grays)
 * Typography: Inter (body) & Playfair Display (headings)
 * Approach: Minimalist, clean lines, heavily relies on whitespace and typographic contrast.
 * No Icons.
 */

/* ==========================================================================
   CSS Variables
   ========================================================================== */
:root {
    /* Colors */
    --c-black: #050505;
    --c-black-light: #1a1a1a;
    --c-gray-dark: #333333;
    --c-gray: #757575;
    --c-gray-light: #e0e0e0;
    --c-gray-bg: #f9f9f9;
    --c-white: #ffffff;

    /* Typography */
    --f-body: 'Inter', sans-serif;
    --f-heading: 'Playfair Display', serif;

    /* Font Sizes */
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.5rem;
    --fs-2xl: 2rem;
    --fs-3xl: 3rem;
    --fs-4xl: 4.5rem;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;

    /* Layout */
    --container-width: 1280px;
    --header-height: 100px;

    /* Transitions */
    --t-fast: 0.2s ease;
    --t-base: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --t-slow: 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--f-body);
    font-weight: 300;
    line-height: 1.6;
    color: var(--c-black);
    background-color: var(--c-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--f-heading);
    font-weight: 400;
    line-height: 1.2;
    color: var(--c-black);
    margin-bottom: var(--space-sm);
}

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

ul,
ol {
    list-style: none;
}

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

/* Accessibility overrides */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   Layout & Containers
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

.grid-2-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.align-center {
    align-items: center;
}

/* Backgrounds */
.bg-light {
    background-color: var(--c-gray-bg);
}

.bg-dark {
    background-color: var(--c-black);
    color: var(--c-white);
}

.bg-dark h2,
.bg-dark h3 {
    color: var(--c-white);
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-white {
    color: var(--c-white);
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */
.section-title {
    font-size: var(--fs-3xl);
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: var(--fs-lg);
    color: var(--c-gray);
    font-family: var(--f-body);
    font-weight: 300;
    margin-bottom: var(--space-lg);
}

.section-text {
    font-size: var(--fs-base);
    color: var(--c-gray-dark);
    margin-bottom: var(--space-md);
}

/* Inline Links (No Icons!) */
.link-inline {
    display: inline-flex;
    align-items: center;
    font-family: var(--f-body);
    font-size: var(--fs-sm);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: relative;
    padding-bottom: 4px;
}

.link-inline::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: currentColor;
    transform-origin: right;
    transform: scaleX(0);
    transition: transform var(--t-base);
}

.link-inline:hover::after {
    transform-origin: left;
    transform: scaleX(1);
}

.link-inline-sm {
    display: inline-block;
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    color: var(--c-black);
    border-bottom: 1px solid var(--c-black);
    padding-bottom: 2px;
    transition: opacity var(--t-fast);
}

.link-inline-sm:hover {
    opacity: 0.6;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-family: var(--f-body);
    font-size: var(--fs-sm);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid var(--c-black);
    background: transparent;
    color: var(--c-black);
    cursor: pointer;
    transition: all var(--t-base);
}

.btn-primary {
    background-color: var(--c-black);
    color: var(--c-white);
}

.btn-primary:hover {
    background-color: var(--c-gray-dark);
    border-color: var(--c-gray-dark);
}

.btn-outline {
    background-color: transparent;
    color: var(--c-white);
    border-color: var(--c-white);
}

.btn-outline:hover {
    background-color: var(--c-white);
    color: var(--c-black);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: background-color var(--t-base), border-color var(--t-base);
}

.site-header.scrolled {
    border-bottom: 1px solid var(--c-gray-light);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 42px;
    width: auto;
    object-fit: contain;
}

.nav-list {
    display: flex;
    gap: var(--space-md);
}

.nav-link {
    font-size: var(--fs-sm);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--c-black);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--t-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.menu-line {
    width: 100%;
    height: 1px;
    background-color: var(--c-black);
    transition: var(--t-base);
}

/* ==========================================================================
   Hero Slider (Iconless)
   ========================================================================== */
.hero {
    position: relative;
    height: 100vh;
    width: 100%;
    background-color: var(--c-black);
    overflow: hidden;
}

.slider-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-slow), visibility var(--t-slow);
}

.slide.active {
    opacity: 1;
    visibility: visible;
}

.slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.slide-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    /* Overlay */
    z-index: 2;
}

.slide-content {
    position: relative;
    z-index: 10;
    height: 100%;
    display: flex;
    align-items: center;
}

.slide-text {
    max-width: 800px;
    color: var(--c-white);
    transform: translateY(30px);
    opacity: 0;
    transition: all var(--t-slow);
    transition-delay: 0.2s;
}

.slide.active .slide-text {
    transform: translateY(0);
    opacity: 1;
}

.slide-subtitle {
    display: block;
    font-family: var(--f-body);
    font-size: var(--fs-xs);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.slide-title {
    font-size: var(--fs-4xl);
    color: var(--c-white);
    margin-bottom: var(--space-md);
}

.slide-desc {
    font-size: var(--fs-lg);
    margin-bottom: var(--space-lg);
    max-width: 600px;
    font-weight: 300;
}

/* Slider Controls (Text Based) */
.slider-controls {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.slider-progress {
    display: flex;
    gap: 15px;
}

.progress-line {
    width: 40px;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    position: relative;
}

.progress-line::after {
    content: '';
    position: absolute;
    top: -10px;
    bottom: -10px;
    left: 0;
    right: 0;
}

.progress-line.active {
    background-color: var(--c-white);
}

.slider-nav-text {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--c-white);
    font-size: var(--fs-xs);
    letter-spacing: 2px;
}

.nav-text-btn {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    font-family: var(--f-body);
    font-size: var(--fs-xs);
    letter-spacing: 2px;
    transition: color var(--t-fast);
}

.nav-text-btn:hover {
    color: var(--c-white);
}

.separator {
    color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   About Snippet
   ========================================================================== */
.about-snippet {
    padding-top: var(--space-xl);
}

.about-content {
    padding-right: var(--space-lg);
}

.about-image-placeholder .img-box {
    width: 100%;
    aspect-ratio: 3/4;
    background-color: var(--c-gray-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-gray);
    font-size: var(--fs-sm);
    letter-spacing: 2px;
}

/* ==========================================================================
   Services Grid
   ========================================================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.service-card {
    background-color: var(--c-white);
    padding: var(--space-lg);
    border: 1px solid var(--c-gray-light);
    transition: border-color var(--t-base), transform var(--t-base);
}

.service-card:hover {
    border-color: var(--c-black);
    transform: translateY(-5px);
}

.service-card .card-title {
    font-size: var(--fs-xl);
    margin-bottom: var(--space-sm);
}

.service-card .card-text {
    color: var(--c-gray-dark);
    margin-bottom: var(--space-md);
    font-size: var(--fs-sm);
}

/* ==========================================================================
   Featured Projects
   ========================================================================== */
.split-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--space-lg);
}

.split-header .section-title {
    margin-bottom: 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.project-card {
    position: relative;
    overflow: hidden;
}

.project-img-box {
    width: 100%;
    aspect-ratio: 4/3;
    background-color: var(--c-gray-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-gray);
    transition: transform var(--t-slow);
}

.project-img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-card:hover .project-img-box {
    transform: scale(1.03);
}

.project-info {
    margin-top: var(--space-sm);
}

.project-title {
    font-size: var(--fs-lg);
    margin-bottom: 0.25rem;
}

.project-meta {
    font-size: var(--fs-xs);
    color: var(--c-gray);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ==========================================================================
   Metrics section
   ========================================================================== */
.metrics-section {
    padding: var(--space-lg) 0;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-item {
    padding: var(--space-lg) 0;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-item:last-child {
    border-right: none;
}

.metric-number {
    display: block;
    font-family: var(--f-heading);
    font-size: var(--fs-4xl);
    margin-bottom: var(--space-xs);
}

.metric-label {
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--c-gray);
}

/* ==========================================================================
   SEO Content Section
   ========================================================================== */
.seo-content {
    background-color: var(--c-white);
}

.seo-container {
    max-width: 800px;
}

.seo-title {
    font-size: var(--fs-2xl);
    margin-bottom: var(--space-md);
    text-align: center;
}

.seo-text-body p {
    margin-bottom: var(--space-sm);
    color: var(--c-gray-dark);
}

.seo-text-body h3 {
    margin-top: var(--space-md);
    font-size: var(--fs-lg);
}

/* ==========================================================================
   Mini Contact Form
   ========================================================================== */
.minimal-form .form-group {
    margin-bottom: var(--space-sm);
}

.form-control {
    width: 100%;
    padding: 1rem 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--c-gray-light);
    font-family: var(--f-body);
    font-size: var(--fs-base);
    color: var(--c-black);
    transition: border-color var(--t-fast);
}

.form-control:focus {
    outline: none;
    border-bottom-color: var(--c-black);
}

.form-control::placeholder {
    color: var(--c-gray);
}

.minimal-form .submit-btn {
    width: 100%;
    margin-top: var(--space-sm);
}

.form-feedback {
    margin-top: var(--space-sm);
    font-size: var(--fs-sm);
    display: none;
}

.form-feedback.error {
    display: block;
    color: #d32f2f;
}

.form-feedback.success {
    display: block;
    color: #388e3c;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background-color: var(--c-black);
    color: var(--c-white);
    padding-top: var(--space-xl);
}

.grid-footer {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.footer-desc {
    color: var(--c-gray);
    margin-top: var(--space-sm);
    font-size: var(--fs-sm);
}

.footer-heading {
    font-family: var(--f-body);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-md);
    color: var(--c-gray);
}

.clean-list li {
    margin-bottom: var(--space-sm);
}

.clean-list a {
    color: var(--c-white);
    font-size: var(--fs-sm);
    opacity: 0.8;
}

.clean-list a:hover {
    opacity: 1;
}

.footer-bottom {
    padding: var(--space-md) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.copyright {
    color: var(--c-gray);
    font-size: var(--fs-xs);
}

/* ==========================================================================
   Responsive (Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
    :root {
        --fs-4xl: 3.5rem;
        --fs-3xl: 2.5rem;
        --space-xl: 6rem;
    }

    .grid-2-col {
        gap: var(--space-md);
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --fs-4xl: 2.5rem;
        --fs-3xl: 2rem;
        --fs-2xl: 1.5rem;
        --fs-xl: 1.25rem;
        --space-lg: 3rem;
        --space-xl: 5rem;
    }

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

    .about-content {
        padding-right: 0;
        margin-bottom: var(--space-md);
    }

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

    .grid-footer {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .metrics-grid {
        grid-template-columns: 1fr;
        border-top: none;
        border-bottom: none;
    }

    .metric-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .metric-item:last-child {
        border-bottom: none;
    }

    .split-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-sm);
    }
    .split-header > div {
        flex: 1;
    }
    .split-header .section-title {
        font-size: 1.5rem;
    }


    /* Mobile Menu */
    .menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--c-white);
        padding: var(--space-lg) var(--space-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--t-base);
        z-index: 999;
    }

    .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--space-md);
        align-items: center;
    }

    .nav-link {
        font-size: var(--fs-lg);
    }

    .menu-toggle.active .menu-line:nth-child(1) {
        transform: translateY(5px) rotate(45deg);
    }

    .menu-toggle.active .menu-line:nth-child(2) {
        transform: translateY(-6px) rotate(-45deg);
    }

    /* Slider texts */
    .slider-controls {
        flex-direction: column;
        gap: var(--space-md);
        bottom: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .services-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        height: 100svh;
        /* More reliable on iOS Safari */
    }
}

/* ==========================================================================
   Project Filter & Modal (Dynamically added)
   ========================================================================== */
.filter-btn {
    background: transparent;
    border: none;
    font-family: var(--f-body);
    font-size: var(--fs-xs);
    letter-spacing: 1px;
    color: var(--c-gray);
    cursor: pointer;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    transition: all var(--t-fast);
}

.filter-btn.active,
.filter-btn:hover {
    color: var(--c-black);
    border-bottom-color: var(--c-black);
}

.portfolio-item {
    transition: opacity var(--t-base);
}

/* Modal Core */
.project-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2000;
    display: none;
    opacity: 0;
    transition: opacity var(--t-base);
}

.project-modal.active {
    display: block;
    opacity: 1;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--c-white);
}

.modal-content {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 2001;
    display: flex;
    flex-direction: column;
}

.modal-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 var(--space-md);
    border-bottom: 1px solid var(--c-gray-light);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    flex-shrink: 0;
}

.modal-close-btn {
    background: transparent;
    border: none;
    font-family: var(--f-body);
    font-size: var(--fs-sm);
    letter-spacing: 1px;
    cursor: pointer;
    color: var(--c-black);
    transition: color var(--t-fast);
}

.modal-close-btn:hover {
    color: var(--c-gray);
}

.modal-scroll-area {
    flex-grow: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* ==========================================================================
   Top Info Bar
   ========================================================================== */
.top-info-bar {
    background-color: var(--c-black);
    color: var(--c-white);
    font-size: var(--fs-xs);
    font-family: var(--f-body);
    letter-spacing: 1px;
    padding: 0.5rem 0;
    z-index: 1001;
    position: relative;
}

.top-info-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-info-left a,
.top-info-right a {
    color: var(--c-gray-light);
    transition: color var(--t-fast);
}

.top-info-left a:hover,
.top-info-right a:hover {
    color: var(--c-white);
}

.top-info-right {
    display: flex;
    gap: 15px;
}

/* Footer grid adjustment for 4 columns */
.grid-footer {
    grid-template-columns: 2fr 1fr 1fr 1fr !important;
}

@media (max-width: 900px) {
    .grid-footer {
        grid-template-columns: 1fr 1fr !important;
    }
}

@media (max-width: 600px) {
    .grid-footer {
        grid-template-columns: 1fr !important;
    }
}

/* Footer Social Icons Layout */
.footer-social .clean-list {
    display: flex;
    gap: 15px;
}

.footer-social .clean-list li {
    margin-bottom: 0;
}

/* Image Placeholders with aaa.jpg */
.img-box img,
.slide-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Scroll To Top Button */
#scrollToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--c-black);
    color: var(--c-white);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--t-base);
    z-index: 999;
}

#scrollToTop.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#scrollToTop:hover {
    background-color: var(--c-primary);
    transform: translateY(-3px);
}
@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--c-white);
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        padding: var(--space-md) var(--space-sm);
        z-index: 1000;
        flex-direction: column;
        border-top: 1px solid var(--c-gray-light);
    }
    .main-nav.active {
        display: flex;
    }
    .nav-list {
        flex-direction: column;
        gap: var(--space-sm);
    }
}