/* ===== CAVDAR.DE - Portfolio ===== */

/* CSS Variables */
:root {
    --bg-body: #f4f4f7;
    --bg-surface: #ffffff;
    --bg-card: #f8f8fb;
    --bg-card-hover: #eeeef4;
    --text-primary: #1a1a2e;
    --text-secondary: #555568;
    --text-muted: #888898;
    --accent: #d07020;
    --accent-hover: #e08030;
    --accent-subtle: rgba(208, 112, 32, 0.08);
    --accent-blue: #3070c0;
    --accent-green: #28855a;
    --border: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.16);
    --radius: 6px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --transition: 0.2s ease;
    --max-width: 1600px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 15px;
}

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

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

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

/* ===== NAVIGATION ===== */
.navbar {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

.nav-logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.15rem;
}

.nav-menu a {
    color: var(--text-secondary);
    padding: 0.4rem 0.7rem;
    border-radius: var(--radius);
    transition: color var(--transition), background-color var(--transition);
    font-size: 0.85rem;
    font-weight: 500;
}

.nav-menu a:hover {
    color: var(--text-primary);
    background-color: rgba(0, 0, 0, 0.05);
}

.nav-menu a.active {
    color: var(--accent);
    background-color: var(--accent-subtle);
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: 4px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--text-muted);
    border-radius: 1px;
    transition: background-color var(--transition);
}

.nav-toggle:hover span {
    background-color: var(--text-primary);
}

/* ===== MAIN CONTENT ===== */
main {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2.5rem 2rem 4rem;
    width: 100%;
}

/* ===== HERO / PAGE HEADER ===== */
.page-header {
    margin-bottom: 3rem;
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
}

/* Hero Section (Homepage only) */
.hero {
    padding: 3rem 0;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.hero-text {
    flex: 1;
}

.hero-photo img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border-hover);
}

.hero-greeting {
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.hero h1 .highlight {
    color: var(--accent);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.7;
}

/* ===== SECTION CARDS (Homepage) ===== */
.section-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background-color: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 0;
}

a.section-card {
    text-decoration: none;
}

.section-card {
    background-color: var(--bg-surface);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition);
}

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

.section-card .icon {
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
    filter: grayscale(0.3);
}

.section-card h2 {
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    font-size: 1rem;
    font-weight: 600;
}

.section-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    flex-grow: 1;
    font-size: 0.88rem;
    line-height: 1.55;
}

.section-card .btn {
    align-self: flex-start;
    font-size: 0.82rem;
    padding: 0.4rem 0.9rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.55rem 1.2rem;
    background-color: var(--accent);
    color: #fff;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.88rem;
    transition: background-color var(--transition), transform var(--transition);
    border: none;
    cursor: pointer;
    letter-spacing: 0.01em;
}

.btn:hover {
    background-color: var(--accent-hover);
    color: #fff;
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-hover);
    color: var(--text-secondary);
    font-weight: 500;
}

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

.btn-tutorial {
    background-color: var(--accent-blue);
    color: #fff;
    border: none;
    font-weight: 600;
}

.btn-tutorial:hover {
    background-color: #60a0e0;
    color: #fff;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.content-section h2 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
    letter-spacing: -0.01em;
}

.content-section h3 {
    color: var(--text-primary);
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
}

.content-section p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.content-section ul,
.content-section ol {
    color: var(--text-secondary);
    margin-left: 1.25rem;
    margin-bottom: 0.75rem;
}

.content-section li {
    margin-bottom: 0.35rem;
}

/* ===== PROJECT CARDS ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.project-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--border);
    transition: border-color var(--transition), background-color var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    background-color: var(--bg-card-hover);
}

.project-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.project-card h3 a {
    color: var(--text-primary);
}

.project-card h3 a:hover {
    color: var(--accent);
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.5;
}

.project-card .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.75rem;
}

.tag {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
    padding: 0.2rem 0.55rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ===== ABOUT PAGE ===== */
.about-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2.5rem;
    align-items: start;
}

.about-image {
    text-align: center;
}

.about-image img {
    max-width: 200px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}

.about-image .placeholder-image {
    width: 200px;
    height: 200px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--text-muted);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.skill-item {
    background-color: var(--bg-card);
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    border-left: 2px solid var(--accent);
}

.skill-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.15rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.skill-item p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin: 0;
}

/* ===== FOOTER ===== */
footer {
    background-color: var(--bg-surface);
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

footer a {
    color: var(--text-secondary);
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 992px) {
    .section-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(12px);
        padding: 0.5rem;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }

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

    .nav-menu a {
        padding: 0.75rem 1rem;
        text-align: left;
        font-size: 0.9rem;
    }

    .nav-toggle {
        display: flex;
    }

    .navbar {
        position: sticky;
    }

    .hero {
        flex-direction: column-reverse;
        text-align: center;
    }

    .hero-description {
        margin: 0 auto;
    }

    .hero-photo img {
        width: 110px;
        height: 110px;
    }

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

    .page-header h1 {
        font-size: 1.6rem;
    }

    main {
        padding: 1.5rem 1rem 3rem;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 2.5rem 0 2rem;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

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

    .content-section {
        padding: 1.25rem;
    }

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

/* ===== CONTACT FORM ===== */
.contact-form {
    max-width: 560px;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.6rem 0.85rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

/* Alert Messages */
.alert {
    padding: 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.25rem;
}

.alert-success {
    background-color: rgba(46, 160, 67, 0.1);
    border: 1px solid rgba(46, 160, 67, 0.4);
    color: #3fb950;
}

.alert-success h3 {
    margin-bottom: 0.5rem;
}

.alert-success .btn {
    margin-top: 0.75rem;
}

.alert-error {
    background-color: rgba(248, 81, 73, 0.1);
    border: 1px solid rgba(248, 81, 73, 0.4);
    color: #f85149;
}