/* ===== Turkuaz & Mavi Tema - Gece/Gündüz Modu ===== */
:root,
[data-theme="light"] {
    --color-bg: #f0f9ff;
    --color-bg-soft: #e0f2fe;
    --color-surface: #ffffff;
    --color-surface-alt: #e0f2fe;
    --color-border: rgba(6, 182, 212, 0.2);
    --color-text: #0c4a6e;
    --color-text-muted: #0369a1;
    --color-accent: #0891b2;
    --color-accent-2: #06b6d4;
    --color-accent-3: #0ea5e9;
    --color-accent-hover: #0e7490;
    --color-gradient: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 50%, #2563eb 100%);
    --color-glow: rgba(6, 182, 212, 0.3);
    --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
    --font-display: 'Space Grotesk', system-ui, sans-serif;
    --radius: 14px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: 0.3s ease;
    --header-height: 76px;
    --shadow: 0 4px 24px rgba(6, 182, 212, 0.15);
    --shadow-lg: 0 8px 40px rgba(6, 182, 212, 0.2);
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-soft: #1e293b;
    --color-surface: #1e293b;
    --color-surface-alt: #334155;
    --color-border: rgba(6, 182, 212, 0.25);
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-accent: #22d3ee;
    --color-accent-2: #06b6d4;
    --color-accent-3: #38bdf8;
    --color-accent-hover: #67e8f9;
    --color-gradient: linear-gradient(135deg, #06b6d4 0%, #38bdf8 50%, #60a5fa 100%);
    --color-glow: rgba(34, 211, 238, 0.25);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(6, 182, 212, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

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

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
    transition: all var(--transition);
    margin-left: 1rem;
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    background: var(--color-glow);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 2;
}

.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }

[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ===== Header & Nav ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.9);
}

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

.nav__logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav__menu {
    display: flex;
    gap: 2.25rem;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: color var(--transition), transform 0.2s;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gradient);
    transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-accent);
}

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

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav__toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 1.75rem;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn--primary {
    background: var(--color-gradient);
    color: #fff;
    box-shadow: var(--shadow);
}

.btn--primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.btn--outline:hover {
    background: var(--color-glow);
    transform: translateY(-2px);
}

/* ===== Page Hero (tüm sayfalar için) ===== */
.page-hero {
    padding: calc(var(--header-height) + 4rem) 1.5rem 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 200%;
    background: radial-gradient(ellipse 60% 50% at 50% 30%, var(--color-glow) 0%, transparent 60%);
    pointer-events: none;
}

.page-hero__title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    position: relative;
}

.page-hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 540px;
    margin: 0 auto;
}

/* ===== Home Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--header-height) 1.5rem 4rem;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 90% 60% at 50% 20%, var(--color-glow) 0%, transparent 55%),
        radial-gradient(ellipse 70% 50% at 80% 80%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 50% 40% at 20% 70%, rgba(37, 99, 235, 0.1) 0%, transparent 45%);
    pointer-events: none;
}

.hero__content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero__subtitle {
    font-size: 1rem;
    color: var(--color-accent);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
    opacity: 0;
    animation: fadeUp 0.8s ease forwards;
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 11vw, 6.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 0.75rem;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.15s forwards;
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__tagline {
    font-size: 1.35rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.3s forwards;
}

.hero__content .btn {
    opacity: 0;
    animation: fadeUp 0.8s ease 0.45s forwards;
}

.hero__scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: inherit;
    transition: opacity 0.2s;
}

.hero__scroll:hover {
    opacity: 0.8;
}

.hero__scroll span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.hero__scroll-line {
    width: 2px;
    height: 36px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    border-radius: 2px;
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* ===== Sections ===== */
.section {
    padding: 5rem 0;
}

.section__title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 2.5rem;
    color: var(--color-text);
}

/* ===== About Page ===== */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 4rem;
    align-items: center;
}

.about__image-wrap {
    position: relative;
}

.about__image-wrap::before {
    content: '';
    position: absolute;
    inset: -12px;
    border-radius: var(--radius-xl);
    background: var(--color-gradient);
    opacity: 0.3;
    z-index: -1;
}

.about__image {
    aspect-ratio: 4/5;
    max-width: 360px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 3px solid var(--color-accent);
    background: linear-gradient(145deg, var(--color-surface-alt) 0%, var(--color-bg-soft) 100%);
}

.about__text p {
    margin-bottom: 1.25rem;
    color: var(--color-text-muted);
    font-size: 1.08rem;
}

.about__lead {
    font-size: 1.3rem !important;
    color: var(--color-text) !important;
    font-weight: 600;
}

/* ===== Skills Grid (daha fazla dil/teknoloji) ===== */
.skills {
    background: var(--color-bg-soft);
    padding: 5rem 0;
}

.skills__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1.25rem;
}

.skills__category {
    margin-bottom: 2.5rem;
}

.skills__category-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skills__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    padding: 1.5rem 1rem;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.skills__item:hover {
    border-color: var(--color-accent);
    transform: translateY(-6px);
    box-shadow: var(--shadow);
}

.skills__icon {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
}

.skills__name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-align: center;
}

/* ===== Home Intro ===== */
.home-intro {
    background: var(--color-bg-soft);
    scroll-margin-top: var(--header-height);
}

.home-intro__content {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

.home-intro__title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.home-intro__text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 1.75rem;
    line-height: 1.7;
}

.home-intro__actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Home Video ===== */
.home-video {
    padding: 5rem 0;
}

.home-video__desc {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.home-video__wrapper {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16/9;
    background: var(--color-surface-alt);
}

.home-video__embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.home-videos__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.home-videos__grid .home-video__wrapper {
    position: relative;
    max-width: 100%;
    display: flex;
    flex-direction: column;
}


.home-video__item-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    order: -1;
}

/* ===== Skill Modal ===== */
.skill-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.skill-modal[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
}

.skill-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    cursor: pointer;
}

.skill-modal__content {
    position: relative;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.skill-modal__close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-bg-soft);
    color: var(--color-text);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.2s;
}

.skill-modal__close:hover {
    background: var(--color-border);
}

.skill-modal__title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    padding-right: 2.5rem;
}

.skill-modal__desc {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ===== Home Links / Cards ===== */
.home-links {
    background: var(--color-bg-soft);
}

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

.home-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.home-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-6px);
    box-shadow: var(--shadow);
}

.home-card__icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.home-card__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.home-card__desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* ===== Contact Page ===== */
.contact {
    padding: 5rem 0;
}

.contact__layout {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.contact__form-wrap {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.contact__form-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.contact__form-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.contact-form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.contact-form__group {
    margin-bottom: 1rem;
}

.contact-form__label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.4rem;
}

.contact-form__input {
    width: 100%;
    padding: 0.85rem 1rem;
    font-family: var(--font-sans);
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition);
}

.contact-form__input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

.contact-form__input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.contact-form__textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form__note {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--color-bg-soft);
    border-radius: var(--radius);
}

.contact-form__btn {
    width: 100%;
}

.contact-form__feedback {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--color-accent);
    min-height: 1.5em;
}

.contact__social {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.contact__social-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.contact__social-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

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

.contact__link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--color-bg-soft);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-weight: 600;
    transition: all var(--transition);
}

.contact__link:hover {
    border-color: var(--color-accent);
    background: var(--color-glow);
    transform: translateX(4px);
}

/* ===== Footer ===== */
.footer {
    padding: 1.75rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
    margin-top: 4rem;
}

.footer__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 300px;
        height: calc(100vh - var(--header-height));
        background: var(--color-surface);
        border-left: 1px solid var(--color-border);
        flex-direction: column;
        padding: 2rem;
        gap: 0;
        transition: right var(--transition);
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    }

    [data-theme="dark"] .nav__menu {
        background: var(--color-bg-soft);
    }

    .nav__menu.show {
        right: 0;
    }

    .nav__menu li {
        padding: 0.85rem 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav__toggle {
        display: flex;
    }

    .nav__toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

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

    .nav__toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .about__grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .about__image-wrap {
        max-width: 280px;
        margin: 0 auto;
    }

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

    .home-links__grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero__title {
        font-size: 2.75rem;
    }

    .contact-form__row {
        grid-template-columns: 1fr;
    }

    .home-intro__actions {
        flex-direction: column;
    }

    .home-intro__actions .btn {
        width: 100%;
    }
}