/* ===== VİTRİN DEĞİŞKENLERİ & TEMALAR ===== */
:root[data-theme="light"] {
    --bg-color: #f8fafc;
    --bg-alt: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-color: #3b82f6;
    /* Afilli Mavi */
    --accent-hover: #2563eb;
    --card-bg: rgba(255, 255, 255, 0.7);
    --border-color: rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --glass-border: rgba(255, 255, 255, 0.4);
}

:root[data-theme="dark"] {
    --bg-color: #0f172a;
    --bg-alt: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --accent-color: #60a5fa;
    /* Açık Mavi */
    --accent-hover: #93c5fd;
    --card-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.05);
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
    --glass-border: rgba(255, 255, 255, 0.05);
}

/* ===== SIFIRLAMA & TEMEL ===== */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    /* Sabit header'ın arkasında kalmaması için mesafe */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    padding: 0 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

/* ===== NAVIGASYON (GLASSMORPHISM) ===== */
.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent-color);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.35rem;
    cursor: pointer;
    padding: 0.6rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg-alt);
    border: 1px solid var(--border-color);
}

.theme-icon-animation {
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.icon-btn:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.icon-btn:active .theme-icon-animation {
    transform: scale(0.7) rotate(180deg);
}

/* NAV LİNKLER */
.nav-links {
    display: flex;
    gap: 0.75rem;
    /* Mobil için daha dar aralık */
    align-items: center;
    overflow-x: auto;
    -ms-overflow-style: none;
    /* Scrollbar gizlemek pçin */
    scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
    display: none;
}

.nav-link {
    font-size: 0.85rem;
    /* Mobil için hafif küçük */
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.2s;
    white-space: nowrap;
}

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

/* ===== HERO SECTİON ===== */
.hero {
    padding-top: 8rem;
    padding-bottom: 4rem;
    text-align: center;
    padding-inline: 1.5rem;
}

.greeting {
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.name {
    font-size: 2.5rem;
    /* Mobile-first font boyutu */
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.role {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.summary {
    max-width: 500px;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #fff !important;
    /* overrides any transition bug */
    border: 2px solid var(--accent-color);
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

/* ===== ORTAK SECTİON STİLLERİ ===== */
.section {
    padding: 3rem 0;
    /* Mobil için azaltıldı */
}

.bg-alt {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    margin: 0 auto 2rem;
    text-align: center;
    position: relative;
    display: table;
    /* İçerik kadar genişlik kaplayıp margin:auto ile ortalanması için */
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* Glass Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 1.5rem;
    /* Mobil için azaltıldı */
    box-shadow: var(--shadow-sm);
    text-align: center;
}

/* ===== YETENEKLER ===== */
.skills-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.skill-badge {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.skill-badge:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* ===== PROJELER ===== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.view-all {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-all:hover {
    text-decoration: underline;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    /* Mobile-first - Tek sütun */
    gap: 1.25rem;
}

/* Masaüstünde çift sütun olsun (Responsive kısmında min-width: 640px için eklenecek) */

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--glass-border);
}

/* Resim Alanı (Görsel Tasarımı) */
.project-img-container {
    width: 100%;
    aspect-ratio: 16 / 9;
    /* Modern en-boy oranı */
    background: var(--bg-color);
    /* Nötr arka plan */
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

:root[data-theme="dark"] .project-img-container {
    background: linear-gradient(135deg, #1e293b, #0f172a);
}

/* İçerideki Resim */
.project-img-container img {
    width: 100%;
    height: 100%;
    object-fit: fill;
    /* Resmi kutuya sığacak şekilde esnetir/sıkıştırır */
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover .project-img-container img {
    transform: scale(1.08);
    /* Hafif ve premium bir zoom */
}

.project-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.topic-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: auto;
}

.project-link {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.project-link:hover {
    text-decoration: underline;
}

.loading-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-style: italic;
}

/* ===== SERTİFİKA LİSTESİ ===== */
.cert-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    backdrop-filter: blur(8px);
}

.cert-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    /* Mobil için daraltıldı */
    padding: 0.75rem 1rem;
    /* Mobil için azaltıldı */
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
}

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

.cert-item:hover {
    background: var(--bg-color);
}

.cert-icon {
    color: var(--accent-color);
    font-size: 1rem;
    flex-shrink: 0;
}

.cert-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.cert-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.cert-issuer {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.cert-link {
    margin-left: auto;
    flex-shrink: 0;
    color: var(--accent-color);
    font-size: 1.1rem;
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    transition: background 0.2s, transform 0.2s;
}

.cert-link:hover {
    background: var(--bg-color);
    transform: scale(1.15);
}

/* ===== FOOTER / İLETİŞİM ===== */
footer {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
}

.contact-section {
    text-align: center;
}

.contact-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: -0.5rem auto 2rem;
    max-width: 480px;
}

.contact-cards {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 480px;
    margin: 0 auto 2.5rem;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.875rem;
    padding: 1rem 1.25rem;
    backdrop-filter: blur(8px);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
}

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

.contact-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.6rem;
    background: var(--accent-color);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.contact-card-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex-grow: 1;
    text-align: left;
}

.contact-card-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-card-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-card-arrow {
    color: var(--text-secondary);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 1rem;
}

/* ===== RESPONSIVE ===== */
@media (min-width: 640px) {
    .section {
        padding: 4rem 0;
    }

    .name {
        font-size: 3.5rem;
    }

    .nav-links {
        gap: 1.5rem;
    }

    .nav-link {
        font-size: 0.95rem;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .glass-card {
        padding: 2rem;
    }

    .cert-item {
        padding: 0.9rem 1.25rem;
        gap: 1rem;
    }
}

@media (min-width: 768px) {
    .name {
        font-size: 4.5rem;
    }

    .section-header .section-title {
        margin-left: 0;
    }

    .section-header .section-title::after {
        left: 0;
        transform: none;
        width: 100%;
    }
}