:root {
    --ssc1: #0f5fd7;
    --ssc2: #6d4bd8;
    --hssc1: #b9811e;
    --hssc2: #0b3f86;
    --paper: #fffdf8;
    --paper-line: rgba(15, 23, 42, .045);
}

.pp-page main { min-height: 70vh; }
.pp-hub .pp-grade-page-only { display: none !important; }
.pp-grade-page .pp-grade-hub { display: none; }

.pp-hero-grid {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: repeating-linear-gradient(0deg, transparent, transparent 37px, rgba(15, 23, 42, .035) 38px);
    -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 85%);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 85%);
}

.pp-hero .badge { gap: 10px; }

/* Grade hub: deliberately four choices only. */
.pp-grade-hub { padding: clamp(3.2rem, 6vw, 5.4rem) 0 clamp(5rem, 8vw, 7rem); }
.pp-hub-heading { max-width: 700px; margin: 0 auto 2rem; text-align: center; }
.pp-hub-heading > span,
.pp-seo-copy-inner > span {
    display: inline-block;
    margin-bottom: .55rem;
    color: #9a741c;
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .16em;
}
.pp-hub-heading h2,
.pp-seo-copy h2 { margin: 0 0 .65rem; color: var(--text); font: 400 clamp(2rem, 4vw, 3rem)/1.05 "Alice", serif; }
.pp-hub-heading p { margin: 0; color: var(--muted); }

.pp-grade-buttons {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
}
.pp-grade-button {
    --grade-color: var(--primary);
    position: relative;
    min-height: 190px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 1.45rem;
    overflow: hidden;
    border: 1px solid rgba(15, 42, 76, .1);
    border-radius: 22px;
    background: linear-gradient(145deg, #fff, color-mix(in srgb, var(--grade-color) 6%, #fff));
    box-shadow: 0 18px 50px rgba(8, 31, 65, .08);
    color: var(--text);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.pp-grade-button::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: var(--grade-color);
}
.pp-grade-button::after {
    content: "";
    position: absolute;
    width: 130px;
    height: 130px;
    right: -45px;
    top: -45px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--grade-color) 10%, transparent);
}
.pp-grade-button:hover {
    transform: translateY(-6px);
    border-color: color-mix(in srgb, var(--grade-color) 32%, transparent);
    box-shadow: 0 24px 60px rgba(8, 31, 65, .13);
}
.pp-grade-button--ssc1 { --grade-color: var(--ssc1); }
.pp-grade-button--ssc2 { --grade-color: var(--ssc2); }
.pp-grade-button--hssc1 { --grade-color: var(--hssc1); }
.pp-grade-button--hssc2 { --grade-color: var(--hssc2); }
.pp-grade-number { position: absolute; top: 1.3rem; left: 1.4rem; color: var(--grade-color); font-size: .72rem; font-weight: 800; letter-spacing: .14em; }
.pp-grade-button strong { color: var(--grade-color); font: 400 1.8rem/1 "Alice", serif; }
.pp-grade-button small { margin-top: .35rem; color: var(--muted); font-weight: 600; }
.pp-grade-button > i { position: absolute; right: 1.35rem; bottom: 1.5rem; color: var(--grade-color); }

/* Grade page filter panel. */
.pp-dashboard { position: relative; z-index: 5; margin-top: -22px; margin-bottom: 2.5rem; }
.pp-grade-page-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}
.pp-grade-page-topline > span { color: var(--muted); font-size: .84rem; font-weight: 700; }
.pp-back-link { display: inline-flex; align-items: center; gap: .55rem; color: var(--primary); font-size: .86rem; font-weight: 700; }

.pp-filter-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(150px, 1fr)) auto;
    align-items: end;
    gap: 1rem;
    padding: 1.35rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: rgba(255,255,255,.98);
    box-shadow: 0 16px 42px rgba(15, 23, 42, .07);
}
.pp-filter-group { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.pp-filter-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-size: .76rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}
.pp-filter-group label i { color: var(--primary); }
.pp-filter-group select {
    min-height: 48px;
    width: 100%;
    padding: 0 2.5rem 0 .9rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--text);
    font: inherit;
    font-size: .9rem;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.pp-filter-group select:hover,
.pp-filter-group select:focus { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(15,95,215,.08); }
.pp-clear-btn {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    padding: 0 1.05rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface-2);
    color: var(--muted);
    font: inherit;
    font-size: .86rem;
    font-weight: 700;
    cursor: pointer;
}
.pp-clear-btn:hover { background: #fff1f2; border-color: #fecdd3; color: #be123c; }
.pp-active-chips { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .9rem; }
.pp-active-chips:empty { margin-top: 0; }
.chip {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .48rem .75rem;
    border: 0;
    border-radius: 999px;
    background: rgba(15, 95, 215, .08);
    color: var(--primary);
    font: inherit;
    font-size: .78rem;
    font-weight: 700;
    cursor: pointer;
}

/* Paper cards. */
.pp-results { margin-bottom: 2.5rem; }
.pp-results-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.25rem; }
#resultsCount { color: var(--muted); font-weight: 600; font-size: .9rem; }
.pp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 1.35rem; }
.paper-card {
    --grade-color: var(--primary);
    position: relative;
    overflow: hidden;
    padding: 1.5rem 1.5rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--paper);
    box-shadow: 0 12px 36px rgba(15,23,42,.065);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.paper-card[data-grade="SSC I"] { --grade-color: var(--ssc1); }
.paper-card[data-grade="SSC II"] { --grade-color: var(--ssc2); }
.paper-card[data-grade="HSSC I"] { --grade-color: var(--hssc1); }
.paper-card[data-grade="HSSC II"] { --grade-color: var(--hssc2); }
.paper-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 9px;
    background: radial-gradient(circle, var(--bg) 3px, transparent 3.2px) 8px 0 / 16px 10px repeat-x;
}
.paper-card::after {
    content: "";
    position: absolute;
    inset: 34px 0 0;
    pointer-events: none;
    background-image: repeating-linear-gradient(0deg, transparent, transparent 27px, var(--paper-line) 28px);
}
.paper-card:hover { transform: translateY(-6px); border-color: rgba(15,95,215,.14); box-shadow: 0 22px 52px rgba(15,23,42,.11); }
.paper-card-top,
.paper-card-body,
.paper-card-actions { position: relative; z-index: 2; }
.paper-card-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 1rem; }
.paper-icon {
    width: 50px;
    height: 50px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--grade-color);
    color: #fff;
    font-size: 1.2rem;
    box-shadow: 0 10px 24px color-mix(in srgb, var(--grade-color) 32%, transparent);
}
.paper-stamp {
    width: 62px;
    height: 62px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    border: 2px dashed var(--grade-color);
    border-radius: 50%;
    color: var(--grade-color);
    text-align: center;
    line-height: 1.08;
    transform: rotate(-12deg);
}
.paper-stamp strong { font: 400 .92rem/1 "Alice", serif; }
.paper-stamp span { margin-top: 2px; font-size: .56rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.paper-card-categories { display: flex; align-items: center; flex-wrap: wrap; gap: .45rem; margin-bottom: .7rem; }
.paper-grade-tag,
.paper-type-tag {
    display: inline-flex;
    align-items: center;
    min-height: 27px;
    padding: .3rem .65rem;
    border-radius: 999px;
    font-size: .7rem;
    font-weight: 800;
    letter-spacing: .025em;
}
.paper-grade-tag { background: color-mix(in srgb, var(--grade-color) 11%, white); color: var(--grade-color); text-transform: uppercase; }
.paper-type-tag { border: 1px solid rgba(15,95,215,.16); background: rgba(15,95,215,.06); color: var(--primary); }
.paper-type-tag.is-paper-ii { border-color: rgba(109,40,217,.16); background: rgba(109,40,217,.07); color: #6d28d9; }
.paper-card-body h3 { margin: 0 0 .6rem; color: var(--text); font: 400 1.28rem/1.25 "Alice", serif; }
.paper-meta { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1.1rem; color: var(--muted); font-size: .8rem; }
.paper-meta span { display: inline-flex; align-items: center; gap: .35rem; }
.paper-meta i { color: var(--grade-color); font-size: .76rem; }
.paper-card-actions { display: flex; flex-wrap: wrap; gap: .55rem; padding-top: .9rem; border-top: 1px dashed var(--border); }
.paper-card-actions a,
.paper-coming-soon {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .45rem;
    flex: 1;
    padding: .65rem .8rem;
    border-radius: 10px;
    font-size: .8rem;
    font-weight: 750;
}
.action-view { background: var(--surface-2); color: var(--text); }
.action-view:hover { background: var(--border); }
.action-download { background: var(--grade-color); color: #fff; }
.action-download:hover { filter: brightness(1.06); }
.action-audio { flex-basis: 100% !important; border: 1px solid rgba(185,129,30,.24); background: rgba(185,129,30,.10); color: var(--navy, #0b2452); }
.paper-coming-soon { color: var(--muted); background: var(--surface-2); }

.pp-empty { display: none; flex-direction: column; align-items: center; gap: .75rem; padding: 4.5rem 1rem; text-align: center; color: var(--muted); }
.pp-empty.visible { display: flex; }
.pp-empty > i { color: var(--primary); font-size: 2.4rem; opacity: .5; }
.pp-empty h3 { margin: .2rem 0 0; color: var(--text); font: 400 1.45rem/1.2 "Alice", serif; }
.pp-empty p { margin: 0; }

/* Compact SEO copy on grade pages. */
.pp-seo-copy { margin: 3rem auto 6rem; }
.pp-seo-copy-inner {
    padding: clamp(1.6rem, 4vw, 2.5rem);
    border: 1px solid rgba(15,95,215,.10);
    border-radius: 24px;
    background: linear-gradient(145deg, #fff, #f8fbff);
}
.pp-seo-copy h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }
.pp-seo-copy p { max-width: 850px; margin: 0; color: var(--muted); line-height: 1.75; }
.pp-seo-links { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.15rem; }
.pp-seo-links a { display: inline-flex; align-items: center; min-height: 42px; padding: .6rem .9rem; border: 1px solid rgba(15,95,215,.14); border-radius: 10px; color: var(--primary); font-size: .82rem; font-weight: 700; background: #fff; }

@media (max-width: 980px) {
    .pp-grade-buttons { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pp-filter-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .pp-clear-btn { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
    .pp-grade-hub { padding-top: 2.7rem; }
    .pp-grade-buttons { grid-template-columns: 1fr; }
    .pp-grade-button { min-height: 135px; }
    .pp-filter-row { grid-template-columns: 1fr; padding: 1rem; }
    .pp-clear-btn { grid-column: auto; }
    .pp-grade-page-topline { align-items: flex-start; flex-direction: column; }
    .pp-grid { grid-template-columns: 1fr; }
    .paper-card { padding: 1.35rem 1.2rem 1.1rem; }
}