/*========================================
DEMO PAGE
Uses design tokens from css/style.css
(--primary, --secondary, --accent, --font-display,
--font-mono, --dark, --gray, --rule, --radius, --shadow)
since style.css is already loaded on this page.
========================================*/

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

html{
    scroll-behavior:smooth;
}

body{

    font-family:var(--font-body);

    background:var(--light);

    color:var(--dark);

    line-height:1.7;

}

img{

    width:100%;

    display:block;

}

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

.hero{

    min-height:60vh;

    background:linear-gradient(135deg,var(--primary-dark),var(--primary));

    color:white;

    display:flex;

    justify-content:center;

    align-items:center;

    text-align:center;

    padding:100px 20px 70px;

}

.hero-content{

    max-width:820px;

}

.badge{

    display:inline-block;

    background:rgba(255,255,255,.16);

    border:1px solid rgba(255,255,255,.3);

    padding:9px 22px;

    border-radius:999px;

    font-family:var(--font-mono);

    font-size:12.5px;

    font-weight:600;

    letter-spacing:.1em;

    text-transform:uppercase;

    margin-bottom:26px;

}

.hero h1{

    font-family:var(--font-display);

    font-weight:600;

    font-size:48px;

    margin-bottom:22px;

    line-height:1.18;

    letter-spacing:-.01em;

}

.hero p{

    font-size:18px;

    opacity:.9;

    margin-bottom:36px;

}

.hero-btn{

    display:inline-block;

    background:white;

    color:var(--primary);

    text-decoration:none;

    padding:17px 34px;

    border-radius:14px;

    font-weight:700;

    transition:.3s;

}

.hero-btn:hover{

    transform:translateY(-4px);

    box-shadow:0 15px 35px rgba(0,0,0,.2);

}

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

section{

    padding:90px 20px;

}

.section-title{

    text-align:center;

    margin-bottom:60px;

}

.section-title h2{

    font-family:var(--font-display);

    font-weight:600;

    font-size:38px;

    margin-bottom:14px;

}

.section-title p{

    max-width:680px;

    margin:auto;

    color:var(--gray);

    font-size:17px;

}

/*========================================
SHOWCASE
========================================*/

.showcase-grid{

    max-width:1200px;

    margin:auto;

    display:grid;

    grid-template-columns:repeat(auto-fit,minmax(320px,1fr));

    gap:30px;

}

.showcase-card{

    background:white;

    border-radius:var(--radius);

    border:1px solid var(--rule);

    overflow:hidden;

    box-shadow:var(--shadow-sm);

    transition:.3s;

}

.showcase-card:hover{

    transform:translateY(-6px);

    box-shadow:var(--shadow);

}

.showcase-card img{

    height:280px;

    object-fit:cover;

}

.showcase-card h3{

    font-family:var(--font-display);

    font-weight:600;

    padding:24px 24px 8px;

    font-size:22px;

}

.showcase-card p{

    padding:0 24px 28px;

    color:var(--gray);

}

/*========================================
QUIZ WRAPPER & PROGRESS
========================================*/

.questions-section{

    background:white;

}

.quiz-wrapper{

    max-width:820px;

    margin:auto;

}

.quiz-progress{

    background:var(--paper);

    border:1px solid var(--rule);

    padding:22px 26px;

    border-radius:var(--radius);

    margin-bottom:32px;

}

.progress-top{

    display:flex;

    justify-content:space-between;

    margin-bottom:14px;

    font-family:var(--font-mono);

    font-size:13px;

    font-weight:600;

    color:var(--dark);

}

.progress-bar{

    height:8px;

    background:var(--rule);

    border-radius:999px;

    overflow:hidden;

}

#progressFill{

    width:0%;

    height:100%;

    background:linear-gradient(90deg,var(--primary),var(--secondary));

    transition:.5s;

}

#questionsContainer{

    display:flex;

    flex-direction:column;

    gap:30px;

}

/*========================================
QUESTION CARD
========================================*/

.question-card{

    background:white;

    border:1px solid var(--rule);

    border-radius:20px;

    padding:36px;

    box-shadow:var(--shadow-sm);

    animation:fadeSlide .4s ease;

}

@keyframes fadeSlide{

    from{
        opacity:0;
        transform:translateY(16px);
    }

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

}

.question-number{

    font-family:var(--font-mono);

    color:var(--primary);

    font-weight:600;

    font-size:13px;

    letter-spacing:.06em;

    text-transform:uppercase;

    margin-bottom:14px;

    display:flex;

    align-items:center;

    gap:10px;

}

.subject-tag{

    background:var(--accent-light);

    color:var(--accent-dark);

    padding:4px 12px;

    border-radius:999px;

    font-size:11.5px;

}

/*========================================
TRANSITION CARD (between MCQ and Free Response)
========================================*/

.transition-card{

    text-align:center;

    padding:48px 36px;

}

.transition-card .question-number{

    justify-content:center;

    color:var(--accent-dark);

}

.transition-card .question-title{

    margin-bottom:16px;

}

.transition-text{

    color:var(--gray);

    max-width:520px;

    margin:0 auto 28px;

    font-size:15.5px;

}

.transition-card .next-btn{

    max-width:320px;

    margin:0 auto;

}

.question-title{

    font-family:var(--font-display);

    font-weight:600;

    margin-bottom:26px;

    font-size:22px;

    line-height:1.4;

}

/*========================================
OPTIONS (multiple choice)
========================================*/

.option{

    width:100%;

    display:flex;

    align-items:center;

    gap:15px;

    padding:18px 20px;

    margin-bottom:13px;

    border:2px solid var(--rule);

    border-radius:14px;

    background:white;

    cursor:pointer;

    transition:.25s;

    font-size:15.5px;

    font-family:var(--font-body);

    text-align:left;

    color:var(--dark);
}

.option:hover{

    border-color:var(--primary);

    background:#F8FBFF;

    transform:translateY(-2px);

    box-shadow:0 8px 20px rgba(10,79,175,.1);

}

.option:active{

    transform:scale(.98);

}

.option-letter{

    width:38px;

    height:38px;

    flex-shrink:0;

    border-radius:50%;

    background:var(--primary);

    color:white;

    display:flex;

    justify-content:center;

    align-items:center;

    font-family:var(--font-mono);

    font-weight:700;

    font-size:14px;

}

.option.correct{

    background:#EFFCF4;

    border-color:var(--success);

}

.option.correct .option-letter{

    background:var(--success);

}

.option.wrong{

    background:#FDF1F1;

    border-color:#DC3545;

}

.option.wrong .option-letter{

    background:#DC3545;

}

.option:disabled{

    cursor:default;

}

.option:disabled:hover{

    transform:none;

    box-shadow:none;

}

/*========================================
FREE RESPONSE QUESTION
========================================*/

.free-response-wrap{

    margin-bottom:10px;

}

.free-response-input{

    width:100%;

    padding:18px 20px;

    font-size:16px;

    font-family:var(--font-body);

    border:2px solid var(--rule);

    border-radius:14px;

    outline:none;

    transition:.25s;

    color:var(--dark);

}

.free-response-input:focus{

    border-color:var(--primary);

    box-shadow:0 0 0 4px rgba(10,79,175,.12);

}

.free-response-input.correct{

    border-color:var(--success);

    background:#EFFCF4;

}

.free-response-input.wrong{

    border-color:#DC3545;

    background:#FDF1F1;

}

.free-response-submit{

    margin-top:16px;

    width:100%;

    padding:16px;

    border:none;

    border-radius:12px;

    background:var(--primary);

    color:white;

    font-size:16px;

    font-weight:700;

    font-family:var(--font-body);

    cursor:pointer;

    transition:.25s;

}

.free-response-submit:hover{

    background:var(--primary-dark);

}

.free-response-submit:disabled{

    opacity:.5;

    cursor:default;

}

.free-response-hint{

    margin-top:16px;

    padding:16px 18px;

    background:var(--accent-light);

    border-left:4px solid var(--accent);

    border-radius:10px;

    font-size:14.5px;

    color:var(--primary-dark);

    display:none;

}

.free-response-hint.visible{

    display:block;

}

/*========================================
FEEDBACK
========================================*/

.feedback{

    margin-top:24px;

    padding:22px 24px;

    border-radius:14px;

    background:var(--paper);

    border-left:5px solid var(--primary);

    line-height:1.7;

}

.feedback h3{

    font-family:var(--font-display);

    font-weight:600;

    margin-bottom:10px;

    font-size:18px;

}

.feedback.correct{

    background:#EFFCF4;

    border-left-color:var(--success);

}

.feedback.wrong{

    background:#FDF1F1;

    border-left-color:#DC3545;

}

/*========================================
NEXT BUTTON
========================================*/

.next-btn{

    margin-top:28px;

    width:100%;

    padding:17px;

    border:none;

    border-radius:12px;

    background:var(--primary);

    color:white;

    font-size:16px;

    font-weight:700;

    font-family:var(--font-body);

    cursor:pointer;

    transition:.25s;

}

.next-btn:hover{

    background:var(--primary-dark);

    transform:translateY(-2px);

}

/*========================================
RESULTS
========================================*/

.results-card{

    background:white;

    border:1px solid var(--rule);

    border-radius:22px;

    padding:60px 40px;

    text-align:center;

    box-shadow:var(--shadow);

    animation:fadeSlide .5s ease;

}

.results-emoji{

    font-size:64px;

    margin-bottom:18px;

}

.results-card h2{

    font-family:var(--font-display);

    font-weight:600;

    font-size:32px;

    margin-bottom:20px;

}

.score-circle{

    width:150px;

    height:150px;

    margin:30px auto;

    border-radius:50%;

    border:7px solid var(--primary);

    display:flex;

    align-items:center;

    justify-content:center;

    font-family:var(--font-mono);

    font-size:38px;

    font-weight:700;

    color:var(--primary);

    animation:popIn .6s ease;

}

@keyframes popIn{

    0%{
        transform:scale(.4);
        opacity:0;
    }

    80%{
        transform:scale(1.06);
    }

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

}

.results-card p{

    font-size:17px;

    color:var(--gray);

    margin-bottom:32px;

}

.restart-btn{

    width:100%;

    padding:17px;

    border:2px solid var(--dark);

    border-radius:12px;

    background:white;

    color:var(--dark);

    font-size:16px;

    font-weight:700;

    font-family:var(--font-body);

    cursor:pointer;

    margin-bottom:16px;

    transition:.25s;

}

.restart-btn:hover{

    background:var(--dark);

    color:white;

}

.unlock-btn{

    display:block;

    width:100%;

}

/*========================================
CTA
========================================*/

.cta{

    background:linear-gradient(135deg,var(--primary-dark),var(--primary));

    color:white;

    text-align:center;

}

.cta h2{

    font-family:var(--font-display);

    font-weight:600;

    font-size:38px;

    margin-bottom:20px;

}

.cta p{

    max-width:700px;

    margin:auto;

    margin-bottom:36px;

    opacity:.92;

}

/*========================================
PREMIUM PREVIEW (unlock teaser)
========================================*/

.premium-preview{

    position:relative;

    margin-top:20px;

}

.blur-text{

    max-height:90px;

    overflow:hidden;

    position:relative;

    line-height:1.7;

}

.blur-text::after{

    content:"";

    position:absolute;

    left:0;
    right:0;
    bottom:0;

    height:50px;

    background:linear-gradient(to bottom,rgba(255,255,255,0),rgba(255,255,255,1));

}

.premium-overlay{

    position:absolute;

    left:0;
    right:0;
    bottom:0;

    display:flex;

    flex-direction:column;

    align-items:center;

    justify-content:center;

    text-align:center;

    padding:20px;

    background:rgba(255,255,255,.9);

    border-radius:12px;

}

.unlock-mini-btn{

    display:inline-block;

    margin-top:15px;

    padding:12px 24px;

    background:var(--primary);

    color:#fff;

    text-decoration:none;

    border-radius:10px;

    font-weight:600;

    transition:.25s ease;

}

.unlock-mini-btn:hover{

    transform:translateY(-2px);

    background:var(--primary-dark);

}

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

@media(max-width:768px){

.hero{

    padding:80px 20px 60px;

}

.hero h1{

    font-size:32px;

}

.hero p{

    font-size:16px;

}

.section-title h2{

    font-size:28px;

}

.question-card{

    padding:24px 20px;

    border-radius:18px;

}

.question-title{

    font-size:19px;

}

.showcase-card img{

    height:220px;

}

.quiz-progress{

    position:sticky;

    top:0;

    z-index:100;

    margin-bottom:20px;

}

.feedback{

    padding:18px;

    font-size:14.5px;

}

.option{

    min-height:64px;

    padding:16px;

    font-size:15px;

}

.next-btn,
.restart-btn,
.unlock-btn,
.free-response-submit{

    width:100%;

}

.question-number{

    flex-wrap:wrap;

}

.transition-card{

    padding:32px 22px;

}

.transition-card .question-title{

    font-size:20px;

}

.free-response-input{

    font-size:15px;

    padding:16px 18px;

}

}