/* ═══ YHTEINEN POHJA KAIKILLE TEEMOILLE ═══ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
    min-height: 100vh;
    font-family: var(--font-body);
    color: var(--text);
    background: var(--bg);
    transition: background 0.4s, color 0.4s;
    overflow-x: hidden;
}

/* Tausta */
.tausta-layer {
    position: fixed; inset: 0; z-index: -2;
    background: var(--bg-gradient);
}
.tausta-layer video,
.tausta-layer img {
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: var(--bg-media-opacity, 0.6);
}
.tausta-overlay {
    position: fixed; inset: 0; z-index: -1;
    background: var(--overlay);
}

/* Navigaatio */
.nav {
    position: sticky; top: 0; z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(var(--nav-blur));
    -webkit-backdrop-filter: blur(var(--nav-blur));
    border-bottom: 1px solid var(--nav-border);
    padding: 0 clamp(16px, 4vw, 48px);
    display: flex;
    align-items: center;
    gap: 24px;
    height: var(--nav-height, 64px);
    transition: all 0.3s;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent);
    text-decoration: none;
    white-space: nowrap;
    background: var(--logo-gradient, none);
    -webkit-background-clip: var(--logo-clip, unset);
    -webkit-text-fill-color: var(--logo-fill, unset);
    background-clip: var(--logo-clip, unset);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
    flex: 1;
    flex-wrap: wrap;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--nav-item-radius, 8px);
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
    white-space: nowrap;
}
.nav-menu a:hover,
.nav-menu a.aktiivinen {
    background: var(--nav-hover-bg);
    color: var(--nav-hover-text);
}

.nav-toiminnot {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.btn-kirjaudu, .btn-rekisteroidy {
    padding: 8px 20px;
    border-radius: var(--btn-radius, 8px);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    white-space: nowrap;
}
.btn-kirjaudu {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}
.btn-kirjaudu:hover {
    background: var(--accent);
    color: white;
}
.btn-rekisteroidy {
    background: var(--accent);
    border: 1px solid var(--accent);
    color: white;
    box-shadow: 0 2px 12px var(--accent-shadow);
}
.btn-rekisteroidy:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-shadow);
}

/* Hero */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: clamp(40px, 8vh, 100px) clamp(20px, 5vw, 80px);
}
.hero-sisalto { max-width: 800px; }
.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 6rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -2px;
    color: var(--hero-otsikko);
    margin-bottom: 20px;
}
.hero p {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--text-dim);
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.6;
}
.hero-napit { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-hero-pk {
    padding: 16px 40px;
    border-radius: var(--btn-radius, 8px);
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.25s;
    border: none;
    cursor: pointer;
}
.btn-hero-pk.ensisijainen {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 24px var(--accent-shadow);
}
.btn-hero-pk.ensisijainen:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-shadow);
}
.btn-hero-pk.toissijainen {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}
.btn-hero-pk.toissijainen:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Sisältöalue */
.main { padding: clamp(40px, 6vw, 80px) clamp(16px, 5vw, 80px); }
.osio { max-width: 1200px; margin: 0 auto 80px; }
.osio-otsikko {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 40px;
    color: var(--text);
}

/* Kortit */
.korttiruudukko {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.kortti {
    background: var(--kortti-bg);
    backdrop-filter: blur(var(--kortti-blur, 0px));
    -webkit-backdrop-filter: blur(var(--kortti-blur, 0px));
    border: 1px solid var(--kortti-border);
    border-radius: var(--kortti-radius, 16px);
    padding: 28px;
    transition: all 0.3s;
}
.kortti:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 12px 40px var(--accent-shadow);
}
.kortti-ikoni { font-size: 2rem; margin-bottom: 16px; }
.kortti h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.kortti p  { color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; }

/* Tilastot */
.tilasto-ruudukko {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}
.tilasto-kortti {
    background: var(--kortti-bg);
    border: 1px solid var(--kortti-border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}
.tilasto-luku {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent);
}
.tilasto-label { font-size: 0.8rem; color: var(--text-dim); margin-top: 4px; }

/* Alatunniste */
footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border);
    padding: 32px clamp(16px, 5vw, 80px);
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* Hamburger mobiililla */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
    border-radius: 2px;
}
.hamburger.auki span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.auki span:nth-child(2) { opacity: 0; }
.hamburger.auki span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 768px) {
    .hamburger { display: flex; }
    .nav-menu {
        position: fixed;
        top: var(--nav-height, 64px);
        left: 0; right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(var(--nav-blur));
        border-bottom: 1px solid var(--nav-border);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        transform: translateY(-110%);
        transition: transform 0.3s;
    }
    .nav-menu.auki { transform: translateY(0); }
    .nav-menu a { padding: 12px 16px; border-radius: 8px; }
}

/* Kirjautunut käyttäjä */
.kayttaja-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px;
    background: var(--nav-hover-bg);
    border-radius: 30px;
    font-size: 0.85rem;
}
.kayttaja-avatar {
    width: 30px; height: 30px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: white;
}

/* Teeman vaihtopainike */
.teema-vaihto {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    width: 36px; height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.teema-vaihto:hover { border-color: var(--accent); color: var(--accent); }

/* ═══ TEEMA i1: KOSMINEN YÖ ═══ */
:root {
    --bg:              #060612;
    --bg-gradient:     radial-gradient(ellipse at 20% 50%, #1a1040 0%, #060612 60%),
                       radial-gradient(ellipse at 80% 20%, #0d1f3c 0%, transparent 50%);
    --overlay:         linear-gradient(to bottom, rgba(6,6,18,0.3), rgba(6,6,18,0.7));
    --surface:         rgba(255,255,255,0.04);
    --border:          rgba(120,100,255,0.2);
    --text:            #e8e4ff;
    --text-dim:        #7070a0;
    --accent:          #7c6fff;
    --accent-shadow:   rgba(124,111,255,0.4);
    --accent2:         #00e5cc;
    --nav-bg:          rgba(6,6,18,0.8);
    --nav-blur:        24px;
    --nav-border:      rgba(120,100,255,0.15);
    --nav-text:        #a0a0cc;
    --nav-hover-bg:    rgba(124,111,255,0.15);
    --nav-hover-text:  #e8e4ff;
    --nav-item-radius: 8px;
    --kortti-bg:       rgba(255,255,255,0.03);
    --kortti-blur:     20px;
    --kortti-border:   rgba(120,100,255,0.15);
    --kortti-radius:   16px;
    --hero-otsikko:    #ffffff;
    --footer-bg:       rgba(6,6,18,0.9);
    --logo-gradient:   linear-gradient(135deg, #7c6fff, #00e5cc);
    --logo-clip:       text;
    --logo-fill:       transparent;
    --font-display:    'Georgia', serif;
    --font-body:       'Segoe UI', system-ui, sans-serif;
    --btn-radius:      10px;
    --nav-height:      64px;
}

/* Tähdet */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(1px 1px at 20% 30%, white 0%, transparent 100%),
        radial-gradient(1px 1px at 40% 70%, rgba(255,255,255,0.8) 0%, transparent 100%),
        radial-gradient(1px 1px at 70% 20%, rgba(255,255,255,0.6) 0%, transparent 100%),
        radial-gradient(2px 2px at 85% 60%, rgba(124,111,255,0.8) 0%, transparent 100%),
        radial-gradient(1px 1px at 10% 80%, rgba(255,255,255,0.5) 0%, transparent 100%);
    background-size: 400px 400px, 300px 300px, 500px 500px, 350px 350px, 450px 450px;
    animation: twinkle 8s ease-in-out infinite alternate;
    z-index: -1;
    pointer-events: none;
}
@keyframes twinkle {
    0%   { opacity: 0.4; }
    100% { opacity: 1; }
}

/* Pyörivä nebula-efekti */
body::after {
    content: '';
    position: fixed;
    width: 600px; height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124,111,255,0.15) 0%, transparent 70%);
    top: -200px; left: -200px;
    animation: nebula 20s ease-in-out infinite alternate;
    z-index: -1;
    pointer-events: none;
}
@keyframes nebula {
    0%   { transform: translate(0,0) scale(1); }
    100% { transform: translate(300px, 200px) scale(1.3); }
}

.hero h1 {
    background: linear-gradient(135deg, #ffffff 0%, #7c6fff 50%, #00e5cc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}