* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    border: none;
    outline: none;
    scroll-behavior: smooth;
    font-family: 'Poppins', sans-serif;
}

:root {
    --bg-color: #0a0a0a;
    --second-bg-color: #131313;
    --text-color: #f0f0f0;
    --main-color: #00ffee;
    --main-color-darker: #00b8a6;
    --card-bg-color: #1a1a1a;
    --border-color: #2c2c2c;

    --header-height: 7rem;
    --header-height-scrolled: 6rem;

    --fs-h2-section: clamp(3rem, 5vw + 1rem, 4.5rem);
    --fs-project-title: clamp(2rem, 3vw + 0.4rem, 2.6rem);
    --fs-project-desc: clamp(1.4rem, 2vw + 0.2rem, 1.6rem);
    --fs-project-tag: clamp(1.1rem, 1.5vw + 0.1rem, 1.3rem);
    --fs-nav: clamp(1.6rem, 2vw + 0.3rem, 1.8rem);

    --padding-section-y: clamp(7rem, 12vh, 12rem);
    --padding-section-x: clamp(2rem, 8vw, 10%);
}

html {
    font-size: 62.5%;
    overflow-x: hidden;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

body.menu-open-no-scroll {
    overflow: hidden !important;
}

main {
    flex-grow: 1;
}

/* --- HEADER --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    padding: 0 var(--padding-section-x);
    background: rgba(8, 8, 8, 0.7);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: top 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), height 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.header.header-scrolled {
    height: var(--header-height-scrolled);
    background: rgba(12, 12, 12, 0.88);
    box-shadow: 0 3px 18px rgba(0, 0, 0, 0.35);
}

.header.header-hidden {
    top: calc(-1 * var(--header-height-scrolled) - 10px);
}
.header.header-visible {
    top: 0;
}

.logo {
    font-size: clamp(2.2rem, 3vw + 0.5rem, 3rem);
    color: var(--text-color);
    font-weight: 700;
    transition: transform 0.3s ease;
}

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

.logo span {
    color: var(--main-color);
    text-shadow: 0 0 15px var(--main-color);
}

/* Masaüstü Navbar */
.navbar {
    display: flex;
    align-items: center;
}

.navbar a { /* Bu genel navbar a stili, mobil için @media içinde ezilecek */
    font-size: var(--fs-nav);
    color: var(--text-color);
    margin-left: clamp(2rem, 4vw, 4rem);
    font-weight: 500;
    transition: color 0.3s ease, transform 0.2s ease;
    position: relative;
    padding-bottom: 0.5rem;
}

.navbar a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--main-color);
    transition: width 0.3s ease;
}

.navbar a:hover,
.navbar a.active {
    color: var(--main-color);
}

.navbar a:hover::after,
.navbar a.active::after {
    width: 100%;
}

#menu-icon {
    font-size: 3.6rem;
    color: var(--main-color);
    display: none; /* Mobil için @media içinde block olacak */
    cursor: pointer;
    z-index: 1001;
    transition: transform 0.3s ease, color 0.3s ease;
}
#menu-icon:hover {
    transform: scale(1.1);
    color: var(--main-color-darker);
}

/* --- PROJELER SAYFASI ÖZEL STİLLERİ --- */
.projects-section {
    padding-top: calc(var(--header-height) + var(--padding-section-y) / 2);
    padding-bottom: var(--padding-section-y);
    padding-left: var(--padding-section-x);
    padding-right: var(--padding-section-x);
}

.section-title {
    font-size: var(--fs-h2-section);
    font-weight: 700;
    text-align: center;
    margin-bottom: calc(var(--padding-section-y) / 2);
    color: var(--text-color);
}
.section-title span {
    color: var(--main-color);
    text-shadow: 0 0 10px var(--main-color);
}

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: clamp(2.5rem, 4vw, 4rem);
}

.project-card {
    background-color: var(--card-bg-color);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.25);
    transition: transform 0.35s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.35s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.35s ease;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 255, 238, 0.25); /* GLOW EFEKTİ */
    border-color: rgba(0, 255, 238, 0.5); /* GLOW EFEKTİ */
}

.project-image-container {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}

.project-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-image-container img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.4s ease;
    gap: 1rem;
    text-align: center;
    padding: 1rem;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.btn-overlay {
    background-color: var(--main-color);
    color: var(--bg-color);
    width: 4.5rem;
    height: 4.5rem;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    font-size: 2.2rem;
    transition: transform 0.3s ease, background-color 0.3s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}
.btn-overlay:hover {
    background-color: var(--main-color-darker);
    transform: scale(1.2) rotate(10deg);
}

.overlay-text {
    color: var(--text-color);
    font-size: clamp(1.3rem, 1.8vw, 1.5rem);
    font-weight: 500;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease 0.1s, transform 0.3s ease 0.1s;
}

.project-card:hover .overlay-text {
    opacity: 1;
    transform: translateY(0);
}

.project-content {
    padding: clamp(1.5rem, 3vw, 2.5rem);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-content h3 {
    font-size: var(--fs-project-title);
    color: var(--text-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.project-content h3 a.project-title-link {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.project-content h3 a.project-title-link:hover {
    color: var(--main-color);
}

.project-description {
    font-size: var(--fs-project-desc);
    color: #b0b0b0;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: auto;
}

.project-tags span {
    background-color: var(--second-bg-color);
    color: var(--main-color);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-size: var(--fs-project-tag);
    font-weight: 500;
    border: 1px solid var(--main-color-darker);
}

/* --- FOOTER --- */
.footer {
    background-color: var(--second-bg-color);
    padding: 4rem var(--padding-section-x) 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.social-icons-footer {
    margin-bottom: 2rem;
}

.social-icons-footer a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4.2rem;
    height: 4.2rem;
    background: transparent;
    border: 2px solid var(--main-color);
    font-size: 2rem;
    border-radius: 50%;
    color: var(--main-color);
    margin: 0 1rem;
    transition: all 0.3s ease-in-out;
}

.social-icons-footer a:hover {
    color: var(--bg-color);
    background-color: var(--main-color);
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 255, 238, 0.3);
}

.footer p {
    font-size: 1.4rem;
    color: #a0a0a0;
    line-height: 1.6;
}
.footer p:last-child {
    margin-top: 0.5rem;
    font-size: 1.2rem;
}
.footer p i {
    vertical-align: middle;
}

/* --- SCROLL TOP BUTTON --- */
#scrollTopBtn {
    position: fixed;
    bottom: 3rem;
    right: 3rem;
    z-index: 999;
    background-color: var(--main-color);
    color: var(--bg-color);
    border: none;
    border-radius: 50%;
    width: 5rem;
    height: 5rem;
    font-size: 2.4rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 255, 238, 0.3);
    opacity: 0;
    transform: translateY(30px);
    transition: background-color 0.3s, transform 0.3s, opacity 0.3s;
    pointer-events: none;
}

#scrollTopBtn.show {
    opacity: 0.85;
    transform: translateY(0);
    pointer-events: auto;
}

#scrollTopBtn:hover {
    background-color: var(--main-color-darker);
    transform: scale(1.1);
    opacity: 1;
}


/* --- PRELOADER --- */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease-out, visibility 0s linear 0.5s;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-text {
    color: var(--main-color);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 1px;
    animation: pulseText 1.5s infinite alternate;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(0, 255, 238, 0.3);
    border-top-color: var(--main-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulseText { from { opacity: 0.7; transform: scale(0.98); } to { opacity: 1; transform: scale(1.02); } }


/* --- MEDIA QUERIES --- */
@media (max-width: 768px) {
    #menu-icon {
        display: block;
    }

    /* Mobil Navbar stilleri */
    .navbar {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background-color: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(8px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: left 0.6s cubic-bezier(0.77, 0, 0.175, 1);
        padding: 0;
        z-index: 1000;
    }

    .navbar.active {
        left: 0;
        z-index: 1050;
    }

    .navbar a {
        font-size: clamp(2.2rem, 6vw, 3rem);
        margin: 1.8rem 0;
        padding: 1.2rem 2.5rem;
        display: block;
        text-align: center;
        color: var(--text-color);
        width: 85%;
        opacity: 0;
        transform: translateY(20px);
        transition: color 0.3s ease, background-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
    }

    .navbar.active a {
        opacity: 1;
        transform: translateY(0);
    }
    .navbar.active a:nth-child(1) { transition-delay: 0.15s; }
    .navbar.active a:nth-child(2) { transition-delay: 0.23s; }
    .navbar.active a:nth-child(3) { transition-delay: 0.31s; }
    .navbar.active a:nth-child(4) { transition-delay: 0.39s; }


    .navbar a::after { display: none; }
    
    .navbar a:hover {
        color: var(--main-color);
        background-color: rgba(0, 255, 238, 0.08);
        border-radius: 8px;
    }
    
    .navbar a.active {
        color: var(--main-color);
        background-color: rgba(0, 255, 238, 0.15);
        border-radius: 8px;
        font-weight: 700;
        border-left: 4px solid var(--main-color);
        transform: scale(1.05);
    }

    /* Projeler Sayfası Mobil Düzenlemeleri */
    .projects-section {
        padding-top: calc(var(--header-height) + 3rem);
    }
    .section-title {
        margin-bottom: 3.5rem;
    }
    .projects-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .project-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0, 255, 238, 0.15), 0 8px 10px rgba(0, 255, 238, 0.1);
    }

    #scrollTopBtn {
        width: 4.5rem; height: 4.5rem; font-size: 2rem; bottom: 2rem; right: 2rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 58%;
    }
    .projects-container {
        gap: 2.5rem;
    }
    .project-content {
        padding: clamp(1.2rem, 2.5vw, 2rem);
    }
     .btn-overlay {
        width: 4rem;
        height: 4rem;
        font-size: 2rem;
    }
    .overlay-text {
        font-size: clamp(1.2rem, 1.6vw, 1.4rem);
    }
}