/* =========================
   RESET
========================= */

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

html{
    scroll-behavior:smooth;
}

body{
    min-height:100vh;
    font-family:Arial, sans-serif;
    background:#0f172a;
    color:white;
}

button,
select{
    font:inherit;
}

/* =========================
   MAIN PAGE WRAPPER
========================= */

.quiz-wrap{
    width:90%;
    max-width:1050px;
    margin:auto;
    padding:35px 20px 60px;
}

/* =========================
   HOME BUTTON
========================= */

.home-button{
    display:inline-flex;
    align-items:center;
    gap:10px;

    margin-bottom:28px;
    padding:12px 22px;

    background:#2563eb;
    color:white;

    border-radius:12px;
    text-decoration:none;
    font-weight:bold;

    box-shadow:0 8px 20px rgba(0,0,0,.3);

    transition:
        transform .25s,
        background .25s,
        box-shadow .25s;
}

.home-button img{
    width:22px;
    height:22px;
    object-fit:contain;
}

.home-button:hover{
    background:#3b82f6;
    transform:translateY(-2px);
    box-shadow:0 12px 30px rgba(0,0,0,.4);
}

.home-button:visited{
    color:white;
}

/* =========================
   PAGE HEADER
========================= */

.quiz-header{
    text-align:center;
    margin-bottom:28px;
}

.quiz-header h1{
    font-size:clamp(2.1rem, 5vw, 3rem);
    margin-bottom:10px;
}

.quiz-header p{
    color:#cbd5e1;
    font-size:1.05rem;
    line-height:1.5;
}

/* =========================
   SETTINGS / CONTROLS
========================= */

.controls{
    display:grid;
    grid-template-columns:repeat(
        auto-fit,
        minmax(190px, 1fr)
    );

    gap:18px;
    margin-bottom:20px;
    padding:22px;

    background:#1e293b;

    border:1px solid rgba(148,163,184,.12);
    border-radius:18px;

    box-shadow:0 10px 30px rgba(0,0,0,.3);
}

.controls label{
    display:flex;
    flex-direction:column;
    gap:8px;

    color:#cbd5e1;
    font-weight:bold;
}

.controls select{
    width:100%;
    padding:12px;

    color:white;
    background:#334155;

    border:1px solid #475569;
    border-radius:10px;

    outline:none;

    transition:
        border-color .2s,
        background .2s;
}

.controls select:hover{
    background:#3f4d61;
}

.controls select:focus{
    border-color:#60a5fa;
}

/* =========================
   STATS
========================= */

.stats{
    display:grid;
    grid-template-columns:repeat(
        auto-fit,
        minmax(130px, 1fr)
    );

    gap:12px;
    margin-bottom:20px;
}

.stats > div{
    padding:16px 12px;

    text-align:center;

    background:#1e293b;

    border:1px solid rgba(148,163,184,.1);
    border-radius:14px;

    box-shadow:0 5px 16px rgba(0,0,0,.18);
}

.stats span{
    display:block;
    margin-bottom:7px;

    color:#94a3b8;
    font-size:.9rem;
}

.stats strong{
    color:#60a5fa;
    font-size:1.45rem;
}

/* =========================
   QUESTION PROGRESS
========================= */

.question-progress{
    margin-bottom:20px;
    padding:18px 20px;

    color:#cbd5e1;
    background:#1e293b;

    border-radius:15px;
}

#questionCounter{
    margin-bottom:12px;
    text-align:center;
    font-weight:bold;
}

.progress-container{
    width:100%;
    height:14px;

    overflow:hidden;

    background:#334155;
    border-radius:999px;
}

#progressBar{
    width:0%;
    height:100%;

    background:linear-gradient(
        90deg,
        #2563eb,
        #60a5fa
    );

    border-radius:999px;
    transition:width .35s ease;
}

/* =========================
   MAIN QUIZ CARD
========================= */

.quiz-card{
    padding:32px;
    margin-bottom:28px;

    background:#1e293b;

    border:1px solid rgba(148,163,184,.1);
    border-radius:22px;

    box-shadow:0 12px 35px rgba(0,0,0,.35);
}

.question-label{
    margin-bottom:16px;

    color:#94a3b8;
    text-align:center;
}

/* =========================
   ANSWERS
========================= */

.answers,
#answers{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));

    gap:14px;
    margin-top:22px;
}

.answers button,
#answers button{
    min-height:58px;
    padding:14px;

    color:white;
    background:#334155;

    border:2px solid transparent;
    border-radius:13px;

    cursor:pointer;
    font-weight:bold;

    transition:
        transform .2s,
        background .2s,
        border-color .2s;
}

.answers button:hover:not(:disabled),
#answers button:hover:not(:disabled){
    background:#475569;
    transform:translateY(-2px);
}

.answers button:disabled,
#answers button:disabled{
    cursor:default;
}

/* =========================
   CORRECT / WRONG
========================= */

.answers button.correct,
#answers button.correct,
.correct{
    color:white !important;
    background:#166534 !important;
    border-color:#4ade80 !important;

    animation:correctPop .35s ease;
}

.answers button.wrong,
#answers button.wrong,
.wrong{
    color:white !important;
    background:#7f1d1d !important;
    border-color:#f87171 !important;

    animation:wrongShake .35s ease;
}

/* =========================
   QUIZ ACTION BUTTONS
========================= */

.quiz-actions{
    display:flex;
    justify-content:center;
    gap:14px;
    flex-wrap:wrap;

    margin-top:24px;
}

.next-button,
.restart-button,
#next,
#restart,
#restartQuiz{
    padding:13px 24px;

    color:white;

    border:none;
    border-radius:12px;

    cursor:pointer;
    font-weight:bold;

    transition:
        transform .2s,
        filter .2s,
        box-shadow .2s;
}

.next-button,
#next{
    background:#2563eb;
}

.restart-button,
#restart,
#restartQuiz{
    background:#475569;
}

.next-button:hover,
.restart-button:hover,
#next:hover,
#restart:hover,
#restartQuiz:hover{
    transform:translateY(-2px);
    filter:brightness(1.12);
    box-shadow:0 10px 22px rgba(0,0,0,.25);
}

/* =========================
   GENERAL CONTENT CARDS
========================= */

.info-card,
.mastery-card,
.achievement-card,
.leaderboard-card{
    margin-bottom:28px;
    padding:28px;

    background:#1e293b;

    border:1px solid rgba(148,163,184,.1);
    border-radius:20px;

    box-shadow:0 10px 30px rgba(0,0,0,.3);
}

.info-card h2,
.mastery-card h2,
.achievement-card h2,
.leaderboard-card h2{
    margin-bottom:20px;
    text-align:center;
}

.info-card{
    color:#cbd5e1;
    line-height:1.6;
}

/* =========================
   MASTERY
========================= */

.mastery-grid{
    display:grid;
    grid-template-columns:repeat(
        auto-fit,
        minmax(180px, 1fr)
    );

    gap:14px;
}

.mastery-item{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:12px;

    padding:16px;

    background:#334155;
    border-radius:12px;
}

.mastery-item span{
    color:#cbd5e1;
}

.mastery-item strong{
    color:#60a5fa;
}

/* =========================
   ACHIEVEMENTS
========================= */

.achievement-card ul{
    display:grid;
    gap:12px;

    list-style:none;
}

.achievement-card li{
    padding:14px;

    color:#e2e8f0;
    background:#334155;

    border-radius:11px;
}

/* =========================
   LEADERBOARD
========================= */

#leaderboard{
    width:100%;
    max-width:500px;

    margin:auto;
    padding-left:32px;
}

#leaderboard li{
    padding:10px 5px;
    color:#cbd5e1;
}

/* =========================
   COMPLETION SCREEN
========================= */

.completion-screen{
    display:none;

    position:fixed;
    inset:0;
    z-index:10000;

    align-items:center;
    justify-content:center;

    padding:20px;

    background:rgba(2,6,23,.82);

    backdrop-filter:blur(7px);

    animation:fadeIn .3s ease;
}

.completion-card{
    width:100%;
    max-width:650px;

    padding:34px;

    color:white;
    text-align:center;

    background:#1e293b;

    border:1px solid rgba(148,163,184,.15);
    border-radius:24px;

    box-shadow:0 20px 60px rgba(0,0,0,.5);

    animation:popup .35s ease;
}

.completion-card h2{
    margin-bottom:12px;
    font-size:2rem;
}

#completionTitle{
    margin-bottom:25px;
    color:#93c5fd;
    font-weight:bold;
}

.completion-stats{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));

    gap:14px;
}

.completion-stats > div{
    padding:18px;

    background:#334155;
    border-radius:14px;
}

.completion-stats span{
    display:block;

    margin-bottom:8px;

    color:#cbd5e1;
}

.completion-stats strong{
    color:#60a5fa;
    font-size:1.4rem;
}

#completionAchievement{
    margin:24px 0;

    color:#facc15;
    font-weight:bold;
}

.completion-buttons{
    display:flex;
    justify-content:center;
    gap:14px;
    flex-wrap:wrap;
}

.completion-buttons button{
    padding:13px 22px;

    color:white;
    background:#2563eb;

    border:none;
    border-radius:11px;

    cursor:pointer;
    font-weight:bold;

    transition:
        transform .2s,
        background .2s;
}

.completion-buttons button:hover{
    background:#3b82f6;
    transform:translateY(-2px);
}

#playAgain{
    background:#16a34a;
}

#playAgain:hover{
    background:#22c55e;
}

/* =========================
   TOAST NOTIFICATIONS
========================= */

.toast{
    position:fixed;
    top:25px;
    right:25px;
    z-index:99999;

    width:min(320px, calc(100% - 40px));

    padding:18px;

    color:white;

    border:2px solid transparent;
    border-radius:16px;

    box-shadow:0 12px 35px rgba(0,0,0,.45);

    backdrop-filter:blur(8px);

    animation:toastIn .35s ease;
}

.toast h3{
    margin-bottom:8px;
}

.toast p{
    color:#e5e7eb;
}

.toast-achievement{
    background:#4c3b08;
    border-color:#facc15;
}

.toast-daily{
    background:#172554;
    border-color:#60a5fa;
}

.toast-level{
    background:#052e16;
    border-color:#4ade80;
}

.toast-mastered{
    background:#083344;
    border-color:#22d3ee;
}

.toast-hide{
    animation:toastOut .4s forwards;
}

/* =========================
   FLOATING XP
========================= */

.xp-float{
    position:fixed;
    z-index:99999;

    pointer-events:none;

    color:#4ade80;

    font-size:1.2rem;
    font-weight:bold;

    animation:xpFloat 1s ease forwards;
}

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

@keyframes correctPop{
    0%{
        transform:scale(1);
    }

    50%{
        transform:scale(1.08);
    }

    100%{
        transform:scale(1);
    }
}

@keyframes wrongShake{
    0%,
    100%{
        transform:translateX(0);
    }

    25%{
        transform:translateX(-6px);
    }

    50%{
        transform:translateX(6px);
    }

    75%{
        transform:translateX(-4px);
    }
}

@keyframes toastIn{
    from{
        opacity:0;
        transform:translateX(120%);
    }

    to{
        opacity:1;
        transform:translateX(0);
    }
}

@keyframes toastOut{
    to{
        opacity:0;
        transform:translateX(120%);
    }
}

@keyframes xpFloat{
    from{
        opacity:1;
        transform:translate(-50%, 0) scale(1);
    }

    to{
        opacity:0;
        transform:translate(-50%, -45px) scale(1.15);
    }
}

@keyframes popup{
    from{
        opacity:0;
        transform:scale(.85);
    }

    to{
        opacity:1;
        transform:scale(1);
    }
}

@keyframes fadeIn{
    from{
        opacity:0;
    }

    to{
        opacity:1;
    }
}

/* =========================
   MOBILE
========================= */

@media(max-width:700px){

    .quiz-wrap{
        width:94%;
        padding:24px 10px 45px;
    }

    .home-button{
        margin-bottom:22px;
    }

    .controls{
        grid-template-columns:1fr;
        padding:18px;
    }

    .stats{
        grid-template-columns:repeat(2, 1fr);
    }

    .quiz-card{
        padding:22px;
    }

    .answers,
    #answers{
        grid-template-columns:1fr;
    }

    .completion-card{
        padding:24px 18px;
    }

    .completion-stats{
        grid-template-columns:1fr;
    }

    .toast{
        top:15px;
        right:15px;
        width:calc(100% - 30px);
    }
}