:root {
    --bg-light: #f4f4f4;
    --bg-dark: #1e1e1e;
    --text-light: #1e1e1e;
    --text-dark: #f4f4f4;
    --accent: #ff4c4c;
    --transition: 0.3s ease;
}

body[data-theme="light"] {
    background-color: var(--bg-light);
    color: var(--text-light);
}

body[data-theme="dark"] {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

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

body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
}

/* === To Top Button === */

#toTopBtn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    background-color: var(--accent);
    color: white;
    border: none;
    outline: none;
    padding: 0.5rem 1rem;
    font-size: 2.5rem;
    font-weight: bold;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition), background var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    max-width: 50px;
    max-height: 50px;
}

#toTopBtn:hover {
    background-color: #ff5c5c;
    transform: translateY(-3px);
}

#toTopBtn.visible {
    opacity: 1;
    pointer-events: auto;
}

/* === Header === */
header {
    background: var(--accent);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
}

.logo a {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
}

.nav-links li a,
.nav-links li button {
    color: white;
    text-decoration: none;
    font-weight: bold;
    background: none;
    border: none;
    cursor: pointer;
    transition: opacity var(--transition);
}

.nav-links li a:hover {
    opacity: 0.7;
}

#themeToggle {
    font-size: 1.2rem;
}

/* === Main Content === */
main {
    padding: 5.5rem;
}

section {
    margin-bottom: 3rem;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: linear-gradient(135deg, var(--accent), #ffce7a);
    color: #fff;
    border-radius: 8px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.btn {
    background: var(--accent);
    color: white;
    padding: 0.7rem 1.5rem;
    text-decoration: none;
    display: inline-block;
    border-radius: 4px;
    font-weight: bold;
    transition: transform var(--transition), background var(--transition);
}

.btn:hover {
    transform: scale(1.05);
    background: #ff5c5c;
}

/* === Tech Stack === */
.tech-stack {
    text-align: center;
}

.tech-stack h2 {
    margin-bottom: 1rem;
}

.tech-icons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.tech-icons img {
    height: 75px;
    margin: 0.5rem;
    transition: transform var(--transition);
    background-color: transparent;
    filter: brightness(1);
}

body[data-theme="dark"] .tech-icons img {
    filter: brightness(1.2);
}

.tech-icons img:hover {
    transform: scale(1.1);
    filter: brightness(1.3);
}

/* === Meine Mission === */
.section-mission {
    max-width: 900px;
    margin: 0 auto 4rem auto;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #1a1a1a, #2c2c2c);
    border-left: 5px solid var(--accent);
    border-radius: 8px;
    text-align: center;
    color: var(--text-dark);
    transition: background var(--transition), color var(--transition);
}

body[data-theme="light"] .section-mission {
    background: linear-gradient(135deg, #f7f7f7, #eaeaea);
    color: var(--text-light);
}

.section-mission h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.section-mission p {
    font-size: 1.15rem;
    line-height: 1.7;
}


/* === Why me? === */
.section-why {
    max-width: 900px;
    margin: 0 auto 4rem auto;
    padding: 3rem 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: background var(--transition), color var(--transition);
}

body[data-theme="light"] .section-why {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.section-why h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.section-why ul {
    list-style: none;
    padding: 0;
    margin: 0 auto;
    max-width: 600px;
    text-align: left;
}

.section-why ul li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    line-height: 1.6;
}


/* === Call to Action === */
.section-cta {
    max-width: 900px;
    margin: 0 auto 4rem auto;
    padding: 3rem 2rem;
    background: var(--accent);
    color: #fff;
    text-align: center;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    transition: background var(--transition), color var(--transition);
}

.section-cta h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.section-cta p {
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.section-cta .btn {
    background: #fff;
    color: var(--accent);
    font-weight: bold;
    padding: 0.8rem 1.6rem;
    border-radius: 4px;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.section-cta .btn:hover {
    background: #ffdddd;
    transform: scale(1.05);
}

/* === About Me Section === */
.about-me {
    max-width: 900px;
    margin: 4rem auto;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border-left: 5px solid var(--accent);
    color: var(--text-dark);
    transition: background var(--transition), color var(--transition);
}
body[data-theme="light"] .about-me {
    background: rgba(0, 0, 0, 0.03);
    color: var(--text-light);
}
.about-me h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    text-align: center;
}
.about-me ul {
    list-style: none;
    padding: 0;
    max-width: 700px;
    margin: 0 auto;
}
.about-me ul li {
    list-style: none;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    line-height: 1.6;
    padding-left: 1.5rem;
    position: relative;
}
.about-me ul li::before {
    content: "➤";
    position: absolute;
    left: 0;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--accent);
}

/* === Services Section === */
.services {
  background: var(--bg-dark);
  padding: 4rem 2rem;
  border-radius: 12px;
  margin: 4rem 0;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  position: relative;
  overflow: hidden;
  color: var(--text-dark);
}
.services::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255,76,76,0.8), rgba(255,206,122,0.8));
  z-index: 0;
}
.services * {
  position: relative;
  z-index: 1;
}
.services h2 {
  font-size: 2.4rem;
  margin-bottom: 2.5rem;
  color: #fff;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}
.feature-card {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: 8px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.feature-card h3 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
  color: var(--accent);
}
.feature-card p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-light);
}
.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}

body[data-theme="light"] .services {
  background: var(--bg-light);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
body[data-theme="light"] .services::before {
  background: linear-gradient(135deg, var(--accent), rgba(255,206,122,0.6));
}

/* === Footer === */
footer {
    text-align: center;
    padding: 2rem 1rem;
    background: #333;
    color: #fff;
    font-size: 0.9rem;
}

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

footer a:hover {
    opacity: 0.7;
}

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

/* Tablets */
@media screen and (max-width: 1024px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .tech-icons img {
        height: 65px;
    }

    .section-mission h2,
    .section-why h2,
    .section-cta h2 {
        font-size: 2rem;
    }

    .section-mission p,
    .section-why li,
    .section-cta p {
        font-size: 1.1rem;
    }
}

/* Smartphones (Landscape) */
@media screen and (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        flex-direction: column;
        align-items: center;
        position: absolute;
        top: 70px;
        right: 0;
        width: 100%;
        background: var(--accent);
        display: none;
        padding: 1rem 0;
        z-index: 99;
    }

    .nav-links.active {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .btn {
        display: block;
        margin: 1rem auto;
    }

    .tech-icons {
        gap: 1rem;
    }

    .tech-icons img {
        height: 60px;
        margin: 0.4rem;
    }

    .feature-grid {
        flex-direction: column;
        align-items: center;
    }

    .feature-card {
        width: 90%;
        max-width: 400px;
    }

    .section-mission,
    .section-why,
    .section-cta {
        padding: 2rem 1.5rem;
    }

    .section-mission h2,
    .section-why h2,
    .section-cta h2 {
        font-size: 1.9rem;
    }

    .section-mission p,
    .section-why li,
    .section-cta p {
        font-size: 1.05rem;
    }
}

/* Smartphones (Portrait) */
@media screen and (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

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

    .feature-card {
        padding: 1.2rem;
    }

    .tech-icons img {
        height: 50px;
    }

    footer {
        font-size: 0.8rem;
    }

    .section-mission,
    .section-why,
    .section-cta {
        padding: 1.5rem 1rem;
    }

    .section-mission h2,
    .section-why h2,
    .section-cta h2 {
        font-size: 1.6rem;
    }

    .section-mission p,
    .section-why li,
    .section-cta p {
        font-size: 1rem;
    }

    .section-cta .btn {
        display: block;
        width: 100%;
        max-width: 250px;
        margin: 0 auto;
    }
}