/* ===========================================
   Poyraz Cevher - Portfolio Design System
   =========================================== */

:root {
    --color-bg: #0b1120;
    --color-bg-alt: #0f172a;
    --color-surface: #162032;
    --color-surface-hover: #1c2840;
    --color-text: #c8d3e0;
    --color-text-heading: #f1f5f9;
    --color-text-muted: #5e7085;
    --color-accent: #3b9ece;
    --color-accent-hover: #5bb8e0;
    --color-accent-subtle: rgba(59, 158, 206, 0.08);
    --color-accent-border: rgba(59, 158, 206, 0.25);
    --color-border: #1e293b;
    --color-border-hover: #2d3d52;
    --color-nav-bg: rgba(11, 17, 32, 0.88);
    --color-footer-bg: #080d18;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Consolas, 'Liberation Mono', monospace;

    --container-max: 1120px;
    --container-padding: 1.5rem;
    --nav-height: 72px;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-full: 9999px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.2);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s ease;
}

[data-theme="light"] {
    --color-bg: #ffffff;
    --color-bg-alt: #f7f9fb;
    --color-surface: #ffffff;
    --color-surface-hover: #f0f4f8;
    --color-text: #3b4a5c;
    --color-text-heading: #0f172a;
    --color-text-muted: #6b7d8f;
    --color-accent: #1a7fa3;
    --color-accent-hover: #156d8c;
    --color-accent-subtle: rgba(26, 127, 163, 0.06);
    --color-accent-border: rgba(26, 127, 163, 0.2);
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;
    --color-nav-bg: rgba(255, 255, 255, 0.92);
    --color-footer-bg: #f0f2f5;
}

/* ===========================================
   Base
   =========================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

a:hover {
    color: var(--color-accent-hover);
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
}

::selection {
    background: var(--color-accent);
    color: #fff;
}

/* ===========================================
   Layout
   =========================================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

/* ===========================================
   Navigation
   =========================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: var(--color-nav-bg);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-heading);
    letter-spacing: -0.01em;
    text-decoration: none;
    white-space: nowrap;
}

.nav-brand:hover {
    color: var(--color-text-heading);
}

.nav-monogram {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--color-accent);
    border: 1.5px solid var(--color-accent-border);
    border-radius: 6px;
    background: var(--color-accent-subtle);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 450;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-heading);
    background: var(--color-accent-subtle);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--color-accent-subtle);
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-heading);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Theme Toggle */

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    margin-left: 0.5rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-border-hover);
    background: var(--color-accent-subtle);
}

.icon-moon {
    display: none;
}

[data-theme="light"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon {
    display: block;
}

/* ===========================================
   Hero
   =========================================== */

.hero {
    position: relative;
    min-height: calc(100vh - 2rem);
    min-height: calc(100dvh - 2rem);
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, var(--color-border) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.4;
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4rem;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 2rem;
}

.hero-greeting {
    display: block;
    font-size: 1.0625rem;
    font-weight: 400;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    letter-spacing: 0.01em;
}

.hero-name {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    color: var(--color-text-heading);
    letter-spacing: -0.025em;
    margin-bottom: 0.75rem;
}

.hero-tagline {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    font-weight: 500;
    line-height: 1.5;
    color: var(--color-text-heading);
    margin-bottom: 1rem;
}

.hero-highlight {
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: clamp(0.9375rem, 1.3vw, 1.0625rem);
    line-height: 1.75;
    color: var(--color-text);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

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

/* ===========================================
   Profile Area
   =========================================== */

.profile-area {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 280px;
    height: 280px;
}

.profile-ring {
    position: absolute;
    inset: 0;
    color: var(--color-accent);
}

.profile-dots {
    width: 100%;
    height: 100%;
}

.profile-image-wrapper {
    position: relative;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.profile-monogram {
    display: none;
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    user-select: none;
}

.profile-image-wrapper.no-photo .profile-photo {
    display: none;
}

.profile-image-wrapper.no-photo .profile-monogram {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

/* ===========================================
   Buttons
   =========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.75rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.4;
    text-decoration: none;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(59, 158, 206, 0.25);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-heading);
    border-color: var(--color-border-hover);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
    transform: translateY(-1px);
}

/* ===========================================
   Sections
   =========================================== */

.section {
    padding: 6rem 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--color-text-heading);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    margin: 1rem auto 0;
    border-radius: var(--radius-full);
}

/* ===========================================
   Hakkımda
   =========================================== */

.about-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ===========================================
   Uzmanlıklar
   =========================================== */

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.expertise-card {
    padding: 2rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.expertise-card:hover {
    border-color: var(--color-accent-border);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.expertise-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    margin-bottom: 1.25rem;
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-sm);
    color: var(--color-accent);
}

.expertise-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 0.625rem;
    line-height: 1.4;
}

.expertise-desc {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-text);
}

/* ===========================================
   Teknolojiler
   =========================================== */

.tech-groups {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.tech-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.tech-category {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: border-color var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
}

.tech-badge:hover {
    border-color: var(--color-accent-border);
    color: var(--color-text-heading);
}

/* ===========================================
   Yaklaşım
   =========================================== */

.approach-intro {
    max-width: 680px;
    margin: 0 auto 3rem;
    text-align: center;
}

.approach-intro p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
}

.approach-steps {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.approach-step {
    position: relative;
    padding: 2rem;
    padding-left: 5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.approach-step:hover {
    border-color: var(--color-accent-border);
}

.approach-step::before {
    content: attr(data-step);
    position: absolute;
    top: 2rem;
    left: 1.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.5;
    font-family: var(--font-mono);
    line-height: 1;
}

.approach-step h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.approach-step p {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-text);
}

/* ===========================================
   İletişim
   =========================================== */

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-desc {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 2.5rem;
}

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

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-heading);
    text-decoration: none;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent-border);
    background: var(--color-accent-subtle);
    color: var(--color-text-heading);
    transform: translateY(-2px);
}

.contact-link svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

/* ===========================================
   Footer
   =========================================== */

.site-footer {
    padding: 2rem 0;
    background: var(--color-footer-bg);
    border-top: 1px solid var(--color-border);
}

.site-footer p {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ===========================================
   Error Page
   =========================================== */

.text-danger {
    color: #ef4444;
}

/* ===========================================
   Animations
   =========================================== */

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .btn:hover,
    .expertise-card:hover,
    .contact-link:hover {
        transform: none;
    }
}

/* ===========================================
   Responsive
   =========================================== */

@media (max-width: 1024px) {
    .hero-container {
        gap: 2.5rem;
    }

    .profile-area {
        width: 240px;
        height: 240px;
    }

    .profile-image-wrapper {
        width: 150px;
        height: 150px;
    }

    .profile-monogram {
        font-size: 2.5rem;
    }

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

@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
        --nav-height: 64px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        background: var(--color-bg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px);
        transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
    }

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

    .nav-link {
        font-size: 1.125rem;
        padding: 0.75rem 1.5rem;
    }

    .theme-toggle {
        margin-left: 0;
        margin-top: 1rem;
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--nav-height) + 2.5rem);
        padding-bottom: 2.5rem;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-greeting {
        font-size: 1rem;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .profile-area {
        width: 200px;
        height: 200px;
    }

    .profile-image-wrapper {
        width: 130px;
        height: 130px;
    }

    .profile-monogram {
        font-size: 2.25rem;
    }

    .section {
        padding: 4rem 0;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

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

    .tech-groups {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .approach-steps {
        grid-template-columns: 1fr;
    }

    .approach-step {
        padding-left: 4.5rem;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    .contact-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    .hero-name {
        font-size: 1.75rem;
    }

    .hero-tagline {
        font-size: 1.0625rem;
    }

    .expertise-card {
        padding: 1.5rem;
    }

    .approach-step {
        padding: 1.5rem;
        padding-left: 4rem;
    }

    .approach-step::before {
        left: 1.25rem;
    }

    .btn {
        padding: 0.7rem 1.25rem;
        font-size: 0.875rem;
        width: 100%;
    }
}