/* ================================
   ROOT
================================ */

:root {
    --accent: #ff6b2c;
    --accent2: #6cf3ff;
    --bg: #050a18;
    --card-bg: rgba(255, 255, 255, .05);
    --card-border: rgba(255, 255, 255, .1);
    --text: #ffffff;
    --muted: rgba(255, 255, 255, .65);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
}


/* ================================
   STARS BACKGROUND
================================ */

.stars-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.star-dot {
    position: absolute;
    border-radius: 50%;
    background: white;
    animation: twinkle var(--dur, 3s) var(--delay, 0s) infinite alternate;
}

@keyframes twinkle {
    from {
        opacity: .2;
    }
    to {
        opacity: .9;
    }
}


/* ================================
   NAV
================================ */

header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(5, 10, 24, .85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    gap: 16px;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 18px;
}

.logo {
    width: 110px;
    height: auto;
    flex-shrink: 0;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-container input {
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .15);
    border-radius: 10px;
    padding: 8px 14px 8px 38px;
    color: white;
    font-size: 13px;
    font-family: 'Poppins', sans-serif;
    outline: none;
    width: 240px;
    transition: .3s;
}

.search-container input::placeholder {
    color: var(--muted);
}

.search-container input:focus {
    border-color: var(--accent2);
    background: rgba(255, 255, 255, .12);
    width: 280px;
}

.search-icon {
    position: absolute;
    left: 12px;
    color: var(--muted);
    font-size: 13px;
    pointer-events: none;
}


/* NAV LINKS */

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: rgba(255, 255, 255, .8);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    transition: .25s;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent2);
    transition: width .3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}


/* HAMBURGER */

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 10000;
}

.hamburger span {
    display: block;
    width: 26px;
    height: 2.5px;
    background: white;
    margin: 5px 0;
    border-radius: 2px;
    transition: .4s;
}

.nav-toggle.active .hamburger span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

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

.nav-toggle.active .hamburger span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    .nav-links {
        position: absolute;
        top: 64px;
        right: 16px;
        flex-direction: column;
        background: rgba(5, 10, 24, .95);
        backdrop-filter: blur(20px);
        border: 1px solid rgba(255, 255, 255, .12);
        border-radius: 14px;
        padding: 12px;
        gap: 0;
        min-width: 200px;
        opacity: 0;
        pointer-events: none;
        transform: translateY(-10px);
        transition: .3s;
    }
    .nav-links.active {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }
    .nav-links a {
        padding: 12px 16px;
        border-radius: 8px;
    }
    .nav-links a:hover {
        background: rgba(255, 255, 255, .06);
    }
    .search-container input {
        width: 160px;
    }
}


/* ================================
   HERO
================================ */

.hero {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 100px 20px 80px;
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.hero h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    background: linear-gradient(135deg, #fff, var(--accent2), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    animation: heroIn 1s ease both;
}

.hero p {
    font-size: clamp(.9rem, 2vw, 1.1rem);
    color: var(--muted);
    max-width: 600px;
    line-height: 1.7;
    margin-bottom: 36px;
    animation: heroIn 1s .2s ease both;
}

.hero-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
    animation: heroIn 1s .4s ease both;
}

@keyframes heroIn {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-btn {
    padding: 13px 28px;
    border-radius: 30px;
    border: none;
    background: linear-gradient(135deg, var(--accent), #ff9f6b);
    color: white;
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: .3s;
    box-shadow: 0 8px 24px rgba(255, 107, 44, .35);
}

.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 32px rgba(255, 107, 44, .5);
}

.hero-btn-outline {
    background: transparent;
    border: 1.5px solid rgba(255, 255, 255, .3);
    color: white;
    box-shadow: none;
}

.hero-btn-outline:hover {
    background: rgba(255, 255, 255, .08);
    border-color: var(--accent2);
    box-shadow: 0 0 20px rgba(108, 243, 255, .2);
}


/* ORBIT RINGS */

.orbits {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: -1;
}

.orbit {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(108, 243, 255, .12);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.orbit1 {
    width: 300px;
    height: 300px;
    animation: rotate 20s linear infinite;
}

.orbit2 {
    width: 500px;
    height: 500px;
    animation: rotate 35s linear infinite reverse;
}

.orbit3 {
    width: 720px;
    height: 720px;
    animation: rotate 55s linear infinite;
}

.orbit4 {
    width: 960px;
    height: 960px;
    animation: rotate 80s linear infinite reverse;
}

@keyframes rotate {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}


/* ================================
   SECTIONS
================================ */

.section {
    position: relative;
    z-index: 1;
    padding: 60px 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.section h2 {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    font-weight: 700;
    margin-bottom: 8px;
}

.section-sub {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 28px;
}


/* ================================
   SCROLL TRACK (horizontal scroll)
================================ */

.scroll {
    overflow-x: auto;
    padding-bottom: 12px;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, .2) transparent;
}

.scroll::-webkit-scrollbar {
    height: 5px;
}

.scroll::-webkit-scrollbar-track {
    background: transparent;
}

.scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, .2);
    border-radius: 3px;
}

.scroll-track {
    display: flex;
    gap: 16px;
    width: max-content;
    padding: 4px 4px 8px;
}


/* ================================
   CARDS
================================ */

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 22px;
    width: 230px;
    flex-shrink: 0;
    backdrop-filter: blur(12px);
    transition: .3s ease;
    cursor: default;
}

.card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, .09);
    border-color: rgba(108, 243, 255, .3);
    box-shadow: 0 20px 50px rgba(0, 0, 0, .4), 0 0 20px rgba(108, 243, 255, .08);
}

.card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card p {
    font-size: 13px;
    color: var(--muted);
    line-height: 1.6;
}


/* PLANET CARD */

.planet {
    cursor: pointer;
}

.planet:hover {
    border-color: var(--accent);
    box-shadow: 0 20px 50px rgba(0, 0, 0, .4), 0 0 20px rgba(255, 107, 44, .15);
}

.planet-img {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.planet-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 0 20px rgba(255, 107, 44, .3));
    transition: .4s;
}

.planet:hover .planet-img img {
    transform: scale(1.08) rotate(5deg);
    filter: drop-shadow(0 0 30px rgba(108, 243, 255, .4));
}

.planet-name {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--accent2);
}

.planet-desc {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 12px;
    line-height: 1.5;
}

.planet-stats {
    font-size: 11px;
    color: rgba(255, 255, 255, .5);
    border-top: 1px solid rgba(255, 255, 255, .08);
    padding-top: 10px;
    line-height: 1.7;
}


/* MISSION CARD */

.mission-card {
    position: relative;
    width: 260px;
}

.mission-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 4px;
    background: rgba(255, 255, 255, .1);
    color: rgba(255, 255, 255, .7);
    letter-spacing: .5px;
    display: inline-block;
    margin-bottom: 10px;
}

.active-badge {
    background: rgba(16, 185, 129, .2);
    color: #6ee7b7;
}

.planned-badge {
    background: rgba(245, 158, 11, .2);
    color: #fcd34d;
}

.card-link {
    display: inline-block;
    margin-top: 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent2);
    text-decoration: none;
    transition: .2s;
}

.card-link:hover {
    color: white;
    text-decoration: underline;
}

.phenomenon-icon {
    font-size: 32px;
    margin-bottom: 12px;
}


/* ================================
   LEARNING PATHS
================================ */

.path-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.path-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px 24px;
    backdrop-filter: blur(12px);
    transition: .3s;
}

.path-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 16px 40px rgba(0, 0, 0, .4);
}

.path-icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.path-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.path-card p {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 18px;
    line-height: 1.6;
}

.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, .1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 14px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    border-radius: 3px;
    transition: width .6s ease;
}

.path-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.path-footer span {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent2);
}

.path-btn {
    padding: 7px 18px;
    background: linear-gradient(135deg, var(--accent), #ff9f6b);
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    transition: .25s;
}

.path-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 107, 44, .4);
}


/* ================================
   QUIZ
================================ */

.quiz-box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 36px;
    max-width: 620px;
    margin: 0 auto;
    backdrop-filter: blur(14px);
}

.quiz-progress-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.quiz-progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, .1);
    border-radius: 3px;
    overflow: hidden;
}

.quiz-progress-bar div {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    border-radius: 3px;
    transition: width .5s ease;
}

#quizCounter {
    font-size: 12px;
    color: var(--muted);
    white-space: nowrap;
}

#question {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 24px;
    min-height: 48px;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.quiz-opt-btn {
    padding: 12px 16px;
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 10px;
    color: white;
    font-family: 'Poppins', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: .25s;
    text-align: left;
}

.quiz-opt-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, .14);
    border-color: var(--accent2);
    transform: translateY(-2px);
}

.quiz-opt-btn.correct {
    background: rgba(16, 185, 129, .2);
    border-color: #10b981;
    color: #6ee7b7;
}

.quiz-opt-btn.wrong {
    background: rgba(239, 68, 68, .2);
    border-color: #ef4444;
    color: #fca5a5;
}

.quiz-opt-btn:disabled {
    cursor: default;
}

.quiz-feedback {
    font-size: 14px;
    font-weight: 600;
    min-height: 20px;
    margin-bottom: 8px;
}

.quiz-score {
    text-align: center;
    font-size: 15px;
    color: var(--muted);
    line-height: 1.7;
}

.quiz-restart-btn {
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--accent), #ff9f6b);
    color: white;
    border: none;
    border-radius: 20px;
    font-family: 'Poppins', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: .3s;
    margin-top: 8px;
}

.quiz-restart-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 107, 44, .4);
}


/* ================================
   PLANET MODAL
================================ */

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(6px);
    padding: 16px;
}

.modal.show {
    display: flex;
    animation: fadeIn .2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: #0d1628;
    border: 1px solid rgba(108, 243, 255, .25);
    border-radius: 20px;
    padding: 36px;
    max-width: 480px;
    width: 100%;
    position: relative;
    animation: modalIn .25s ease;
    box-shadow: 0 30px 80px rgba(0, 0, 0, .7), 0 0 30px rgba(108, 243, 255, .1);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-content h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    color: var(--accent2);
    margin-bottom: 4px;
}

.modal-content p {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.7;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, .08);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 8px;
    color: white;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: .2s;
    line-height: 1;
}

.modal-close:hover {
    background: rgba(239, 68, 68, .2);
    color: #fca5a5;
    border-color: #ef4444;
}

.modal-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.modal-stat {
    background: rgba(255, 255, 255, .05);
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.modal-stat span {
    font-size: 11px;
    color: var(--muted);
}

.modal-stat strong {
    font-size: 13px;
    font-weight: 600;
    color: white;
}


/* ================================
   FOOTER
================================ */

.explore-footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 32px 20px;
    border-top: 1px solid rgba(255, 255, 255, .08);
    color: var(--muted);
    font-size: 13px;
}


/* ================================
   RESPONSIVE
================================ */

@media (max-width: 600px) {
    .quiz-options {
        grid-template-columns: 1fr;
    }
    .quiz-box {
        padding: 24px 18px;
    }
    .modal-stats {
        grid-template-columns: 1fr;
    }
    .search-container {
        display: none;
    }
}