/* ============================================
   RBS Bilisim - Personal Website Styles
   ============================================ */

:root {
    --primary: #0284c7;
    --primary-dark: #0369a1;
    --accent: #38bdf8;
    --bg-dark: #e0f2fe;
    --bg-card: #bae6fd;
    --bg-card-hover: #7dd3fc;
    --text-primary: #0f172a;
    --text-secondary: #1e3a5f;
    --text-muted: #334155;
    --border: #7dd3fc;
    --green: #16a34a;
    --yellow: #ca8a04;
    --red: #dc2626;
    --gradient: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
    --shadow: 0 4px 24px rgba(14, 165, 233, 0.2);
    --radius: 12px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(224, 242, 254, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.navbar.scrolled {
    background: rgba(224, 242, 254, 0.98);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-sign {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--gradient);
    padding: 7px 16px 7px 12px;
    border-radius: 10px;
    box-shadow:
        0 4px 14px rgba(14, 165, 233, 0.4),
        0 1px 3px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition);
    text-decoration: none;
}

.logo-sign:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 22px rgba(14, 165, 233, 0.5),
        0 2px 6px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.logo-sign-icon {
    color: rgba(255, 255, 255, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-text {
    color: white;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}


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

.logo-sign .logo-accent {
    color: white;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 96px 24px 64px;
    max-width: 1200px;
    margin: 0 auto;
    gap: 64px;
    position: relative;
}

.hero-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 10% 20%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 90% 80%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.hero-content {
    flex: 1;
    min-width: 0;
}

.hero-greeting {
    color: var(--primary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-name {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-description {
    color: var(--text-muted);
    max-width: 540px;
    margin-bottom: 40px;
    font-size: 1.05rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ============================================
   Code Card (Hero Visual)
   ============================================ */
.hero-visual {
    flex: 0 0 340px;
}

.code-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.88rem;
}

.code-header {
    background: rgba(14, 165, 233, 0.15);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--yellow); }
.dot.green { background: var(--green); }

.code-title {
    margin-left: auto;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: 'Inter', sans-serif;
}

.code-body {
    padding: 20px;
    line-height: 1.8;
}

.code-body p {
    white-space: pre;
}

.kw { color: #c084fc; }
.var { color: #60a5fa; }
.prop { color: #34d399; }
.str { color: #fb923c; }
.bool { color: #f472b6; }

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(14, 165, 233, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg-card);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-full {
    width: 100%;
}

/* ============================================
   Container & Section Styles
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-family: 'Courier New', monospace;
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

/* ============================================
   About Section
   ============================================ */
.about {
    background: rgba(30, 41, 59, 0.3);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--text-primary);
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-content: flex-start;
}

.skill-tag {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
    cursor: default;
}

.skill-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(14, 165, 233, 0.08);
}

/* ============================================
   Services Section
   ============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: all var(--transition);
}

.service-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(14, 165, 233, 0.1);
}

.service-icon {
    width: 48px;
    height: 48px;
    background: rgba(14, 165, 233, 0.12);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary);
}

.service-icon svg {
    width: 24px;
    height: 24px;
}

.service-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: rgba(30, 41, 59, 0.3);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 40px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    background: rgba(14, 165, 233, 0.12);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 20px;
    height: 20px;
}

.contact-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
}

.contact-value {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
}

.contact-value:hover {
    color: var(--primary);
}

/* Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition);
    outline: none;
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background: rgba(14, 165, 233, 0.04);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: rgba(125, 211, 252, 0.3);
    border-top: 1px solid var(--border);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        padding-top: 100px;
        gap: 40px;
    }

    .hero-visual {
        flex: none;
        width: 100%;
        max-width: 340px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        gap: 24px;
    }

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

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(224, 242, 254, 0.98);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
        gap: 4px;
    }

    .nav-menu.open {
        display: flex;
    }

    .hamburger {
        display: flex;
    }
}

@media (max-width: 480px) {
    section {
        padding: 72px 0;
    }

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

    .btn {
        width: 100%;
    }

    .about-stats {
        flex-direction: column;
        gap: 16px;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content > * {
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.hero-greeting { animation-delay: 0.1s; }
.hero-title    { animation-delay: 0.2s; }
.hero-subtitle { animation-delay: 0.3s; }
.hero-description { animation-delay: 0.4s; }
.hero-buttons  { animation-delay: 0.5s; }

.hero-visual {
    animation: fadeInUp 0.7s ease 0.3s forwards;
    opacity: 0;
}