/* ===== CSS Custom Properties ===== */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #dae4f2;
    --color-bg-alt: #f4f7fc;
    --color-border: #e5e7eb;
    --color-white: #ffffff;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 1120px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-text-light);
    font-size: 1.125rem;
    max-width: 600px;
    margin-bottom: 3rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-1px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ===== Navigation ===== */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(218, 228, 242, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition);
}

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

.nav-links .btn {
    color: var(--color-white);
}

.nav-links .btn:hover {
    color: var(--color-white);
}

.nav-cta {
    margin-left: 0.5rem;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-text);
    margin: 5px 0;
    transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
.hero {
    padding: 5rem 0 4rem;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 4rem;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    width: 240px;
    height: 240px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 20%;
    border: 4px solid var(--color-bg-alt);
    box-shadow: var(--shadow-lg);
}

.hero-photo-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-alt));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--color-primary);
    border: 4px solid var(--color-bg-alt);
    box-shadow: var(--shadow-lg);
}

.hero-text h1 {
    margin-bottom: 1rem;
}

.hero-text h1 span {
    color: var(--color-primary);
}

.hero-text p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 520px;
    margin-bottom: 2rem;
    line-height: 1.7;
}

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

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

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

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header .section-subtitle {
    margin-left: auto;
    margin-right: auto;
}

/* ===== Services (Co dělám) ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.service-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all var(--transition);
}

.service-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.service-icon {
    width: 3rem;
    height: 3rem;
    background-color: var(--color-primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.service-card h3 {
    color: var(--color-text);
}

.service-card p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ===== Technologies ===== */
.tech-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.tech-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition);
}

.tech-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* ===== Projects ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.project-card:hover {
    box-shadow: var(--shadow-md);
}

.project-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-img-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg-alt) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 3rem;
}

.project-body {
    padding: 1.5rem;
}

.project-body h3 {
    margin-bottom: 0.5rem;
}

.project-body p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 1rem;
}

.project-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.625rem;
    background-color: var(--color-bg-alt);
    border-radius: 1rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.project-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
}

.project-detail.expanded {
    max-height: 500px;
    opacity: 1;
}

.project-detail-content {
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.project-detail-content p {
    margin-bottom: 0.75rem;
}

.btn-expand {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    transition: color var(--transition);
}

.btn-expand:hover {
    color: var(--color-primary-hover);
}

.btn-expand .arrow {
    transition: transform 0.3s ease;
    display: inline-block;
}

.btn-expand.active .arrow {
    transform: rotate(180deg);
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h3 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.contact-info > p {
    color: var(--color-text-light);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.contact-item-icon {
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--color-primary-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.contact-item a {
    color: var(--color-text);
    font-weight: 500;
    transition: color var(--transition);
}

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

.contact-item .btn {
    color: var(--color-white);
}

.contact-item .btn:hover {
    color: var(--color-white);
}

.contact-name {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.contact-qr {
    margin-top: 2rem;
    text-align: center;
}

.contact-qr img {
    width: 160px;
    height: 160px;
    margin: 0 auto;
}

.contact-qr p {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

.contact-form {
    background-color: var(--color-bg-alt);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-white);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.form-group input.error,
.form-group textarea.error {
    border-color: #ef4444;
}

.form-error {
    color: #ef4444;
    font-size: 0.8125rem;
    margin-top: 0.25rem;
    display: none;
}

.form-error.visible {
    display: block;
}

.form-success {
    display: none;
    padding: 1rem;
    background-color: #ecfdf5;
    border: 1px solid #a7f3d0;
    border-radius: var(--radius);
    color: #065f46;
    text-align: center;
    font-weight: 500;
}

.form-success.visible {
    display: block;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-text);
    color: rgba(255, 255, 255, 0.7);
    padding: 3rem 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition);
}

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

.footer-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    /* Nav mobile */
    .hamburger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 4rem;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-cta {
        margin-left: 0;
    }

    /* Hero mobile */
    .hero {
        padding: 3rem 0;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }

    .hero-text p {
        margin-left: auto;
        margin-right: auto;
    }

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

    /* Projects mobile */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Contact mobile */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    /* Footer mobile */
    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    .hero-photo img,
    .hero-photo-placeholder {
        width: 150px;
        height: 150px;
        font-size: 3rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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