/* =====================================================
   papirek.cz — Personal Portfolio
   Dark theme, Space Grotesk, electric purple accent
   ===================================================== */

/* ---- Variables ---- */
:root {
    --accent:       #a855f7;
    --accent-dim:   #7c3aed;
    --accent-glow:  rgba(168, 85, 247, 0.25);
    --accent-soft:  rgba(168, 85, 247, 0.08);

    --bg:           #0a0a0f;
    --bg-card:      #111118;
    --bg-card-hover:#16161f;
    --bg-nav:       rgba(10, 10, 15, 0.85);

    --border:       rgba(255,255,255,0.07);
    --border-hover: rgba(168, 85, 247, 0.35);

    --text:         #e2e2e8;
    --text-muted:   #7a7a8c;
    --text-faint:   #3a3a4a;

    --gradient:     linear-gradient(135deg, #a855f7 0%, #3b82f6 100%);
    --gradient-alt: linear-gradient(135deg, #7c3aed 0%, #06b6d4 100%);

    --radius:       12px;
    --radius-lg:    20px;
    --nav-h:        70px;

    --font-head:    'Space Grotesk', sans-serif;
    --font-body:    'Inter', sans-serif;

    --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 3px; }

/* ---- Container ---- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =====================================================
   NAVIGATION
   ===================================================== */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: var(--nav-h);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--transition);
}

.nav.scrolled {
    box-shadow: 0 4px 30px rgba(0,0,0,0.4);
}

.nav__inner {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-family: var(--font-head);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.02em;
}

.logo-bracket {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__links {
    display: flex;
    gap: 36px;
}

.nav__link {
    font-family: var(--font-head);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -3px; left: 0; right: 0;
    height: 2px;
    background: var(--gradient);
    border-radius: 2px;
    transform: scaleX(0);
    transition: transform var(--transition);
}

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

.nav__link:hover::after,
.nav__link.active::after {
    transform: scaleX(1);
}

.nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

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

.nav__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =====================================================
   BUTTONS
   ===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-head);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 12px 24px;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn--primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 0 0 0 var(--accent-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.btn--outline {
    background: transparent;
    color: var(--accent);
    border: 1.5px solid var(--accent-dim);
}

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

.btn--ghost {
    background: transparent;
    color: var(--accent);
    padding: 8px 0;
    font-size: 0.85rem;
}

.btn--ghost:hover { gap: 12px; }

.btn--sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

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

/* =====================================================
   HERO
   ===================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: var(--nav-h) 24px 80px;
}

/* Radial gradient background */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(168, 85, 247, 0.12) 0%, transparent 70%),
        radial-gradient(ellipse 60% 80% at 80% 100%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

/* Grid pattern */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse 100% 80% at 50% 50%, black 0%, transparent 70%);
}

/* Particles canvas */
.hero__particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.hero__particle {
    position: absolute;
    border-radius: 50%;
    animation: float-particle linear infinite;
    pointer-events: none;
}

@keyframes float-particle {
    0%   { transform: translateY(100vh) scale(0); opacity: 0; }
    10%  { opacity: 1; }
    90%  { opacity: 1; }
    100% { transform: translateY(-20vh) scale(1); opacity: 0; }
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 760px;
}

.hero__badge {
    display: inline-block;
    background: var(--accent-soft);
    border: 1px solid var(--border-hover);
    color: var(--accent);
    font-family: var(--font-head);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}

.hero__name {
    font-family: var(--font-head);
    font-size: clamp(2.8rem, 8vw, 5.5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.hero__title {
    font-family: var(--font-head);
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--text-muted);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.hero__title-static { color: var(--text); }

.hero__title-dynamic {
    color: var(--accent);
    font-weight: 600;
    min-width: 2px;
}

.hero__cursor {
    color: var(--accent);
    animation: blink 1s infinite;
    font-weight: 300;
}

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

.hero__text {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 580px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero__socials {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.social-link {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 1rem;
    transition: all var(--transition);
}

.social-link:hover {
    color: var(--accent);
    border-color: var(--accent-dim);
    background: var(--accent-soft);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--accent-glow);
}

.hero__scroll-hint {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-faint);
    font-size: 0.75rem;
    font-family: var(--font-head);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%       { transform: translateX(-50%) translateY(6px); }
}

/* =====================================================
   SECTIONS (shared)
   ===================================================== */
.section {
    padding: 100px 0;
    position: relative;
}

.section--alt {
    background: rgba(255,255,255,0.015);
}

.section__header {
    text-align: center;
    margin-bottom: 56px;
}

.section__label {
    display: inline-block;
    font-family: var(--font-head);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.section__title {
    font-family: var(--font-head);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 16px;
}

.section__subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* =====================================================
   PROJECTS
   ===================================================== */
.projects { background: var(--bg); }

/* Filter */
.filter {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.filter__btn {
    font-family: var(--font-head);
    font-size: 0.82rem;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: 100px;
    border: 1.5px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.filter__btn:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.filter__btn.active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

/* Grid */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* Card */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.4), 0 0 0 1px var(--border-hover);
    background: var(--bg-card-hover);
}

.project-card.hidden {
    display: none;
}

.project-card__thumb {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, #111118 0%, #0d0d18 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-card__thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition);
}

.project-card:hover .project-card__thumb::before {
    opacity: 1;
}

.project-card__placeholder {
    font-size: 3.5rem;
    color: var(--text-faint);
    transition: all var(--transition);
    z-index: 1;
}

.project-card:hover .project-card__placeholder {
    color: var(--accent);
    transform: scale(1.1);
    filter: drop-shadow(0 0 20px var(--accent-glow));
}

.project-card__badge {
    position: absolute;
    top: 14px;
    right: 14px;
    font-family: var(--font-head);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 100px;
    letter-spacing: 0.03em;
}

.badge--app    { background: rgba(168,85,247,0.15); color: #c084fc; border: 1px solid rgba(168,85,247,0.3); }
.badge--webapp { background: rgba(59,130,246,0.15); color: #60a5fa; border: 1px solid rgba(59,130,246,0.3); }
.badge--web    { background: rgba(16,185,129,0.15); color: #34d399; border: 1px solid rgba(16,185,129,0.3); }
.badge--game   { background: rgba(245,158,11,0.15); color: #fbbf24; border: 1px solid rgba(245,158,11,0.3); }
.badge--fun    { background: rgba(239,68,68,0.15);  color: #f87171; border: 1px solid rgba(239,68,68,0.3); }

.project-card__body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.project-card__title {
    font-family: var(--font-head);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.project-card__desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex: 1;
}

/* =====================================================
   BLOG
   ===================================================== */
.blog {
    background: rgba(255,255,255,0.015);
}

.blog__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: all var(--transition);
}

.blog-card--placeholder {
    opacity: 0.5;
    cursor: default;
}

.blog-card:not(.blog-card--placeholder):hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.blog-card__icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    color: var(--accent);
    font-size: 1.1rem;
}

.blog-card h3 {
    font-family: var(--font-head);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.blog-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.65;
    flex: 1;
}

.blog-card__tag {
    font-family: var(--font-head);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.05em;
}

.blog__coming-soon {
    text-align: center;
    padding: 24px;
    color: var(--text-faint);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 0.9rem;
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    max-width: 400px;
    margin: 0 auto;
}

.blog__coming-soon i {
    font-size: 1.2rem;
    color: var(--accent-dim);
    opacity: 0.6;
}

/* =====================================================
   CONTACT
   ===================================================== */
.contact { background: var(--bg); }

.contact__layout {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 56px;
    align-items: start;
}

.contact__info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact__info-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact__info-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius);
    color: var(--accent);
    font-size: 1rem;
}

.contact__info-item strong {
    display: block;
    font-family: var(--font-head);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 3px;
}

.contact__info-item a,
.contact__info-item span {
    font-size: 0.95rem;
    color: var(--text);
    transition: color var(--transition);
}

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

.contact__availability {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-head);
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 14px 18px;
    background: rgba(16,185,129,0.06);
    border: 1px solid rgba(16,185,129,0.2);
    border-radius: var(--radius);
    margin-top: 8px;
}

.availability-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #34d399;
    flex-shrink: 0;
    box-shadow: 0 0 0 3px rgba(52,211,153,0.2);
    animation: pulse-green 2s ease-in-out infinite;
}

@keyframes pulse-green {
    0%, 100% { box-shadow: 0 0 0 3px rgba(52,211,153,0.2); }
    50%       { box-shadow: 0 0 0 6px rgba(52,211,153,0.05); }
}

/* Form */
.contact__form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.form-group label {
    font-family: var(--font-head);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.form-group input,
.form-group textarea {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    resize: none;
    outline: none;
}

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

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-dim);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form__success {
    display: none;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    background: rgba(16,185,129,0.08);
    border: 1px solid rgba(16,185,129,0.25);
    border-radius: var(--radius);
    color: #34d399;
    font-size: 0.9rem;
    font-family: var(--font-head);
}

.form__success.visible {
    display: flex;
}

/* =====================================================
   FOOTER
   ===================================================== */
.footer {
    padding: 36px 0;
    border-top: 1px solid var(--border);
}

.footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.footer__copy {
    font-size: 0.85rem;
    color: var(--text-faint);
}

.heart { color: var(--accent); }

.footer__socials {
    display: flex;
    gap: 10px;
}

.footer__socials .social-link {
    width: 36px;
    height: 36px;
    font-size: 0.85rem;
}

/* =====================================================
   ANIMATIONS
   ===================================================== */

/* Fade up — triggered by .in class added via JS */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }
.delay-4 { transition-delay: 0.6s; }
.delay-5 { transition-delay: 0.75s; }

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 900px) {
    .contact__layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav__links {
        position: fixed;
        top: var(--nav-h);
        left: 0; right: 0;
        background: var(--bg-nav);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        flex-direction: column;
        align-items: center;
        gap: 0;
        padding: 16px 0;
        border-bottom: 1px solid var(--border);
        transform: translateY(-110%);
        transition: transform var(--transition);
        pointer-events: none;
    }

    .nav__links.open {
        transform: translateY(0);
        pointer-events: all;
    }

    .nav__link {
        padding: 14px 24px;
        width: 100%;
        text-align: center;
        font-size: 1rem;
    }

    .nav__hamburger { display: flex; }

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

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

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

    .filter {
        gap: 6px;
    }

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

    .section { padding: 72px 0; }
}

@media (max-width: 480px) {
    .filter__btn {
        font-size: 0.77rem;
        padding: 7px 13px;
    }

    .hero__title {
        flex-wrap: wrap;
    }
}