:root {
    --primary: #5277a3;
    --primary-dark: #3f5f86;
    --accent: #5b9b74;
    --accent-soft: #e8f2ec;
    --background: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #edf3f8;
    --text: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow: 0 18px 45px rgba(17, 24, 39, 0.08);
    --shadow-soft: 0 10px 25px rgba(17, 24, 39, 0.06);
    --radius: 16px;
    --radius-small: 12px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: "Inter", Arial, sans-serif;
    line-height: 1.65;
}

body.nav-open {
    overflow: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary-dark);
}

img,
svg {
    display: block;
}

button,
input,
select,
textarea {
    font: inherit;
}

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(17, 24, 39, 0.96);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(14px);
    transition: box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
    background: rgba(17, 24, 39, 0.98);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 10px 30px rgba(17, 24, 39, 0.22);
}

.nav-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 74px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-family: "Poppins", Arial, sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0;
    white-space: nowrap;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: #5277a3;
    color: #fff;
    font-size: 0.95rem;
    box-shadow: 0 12px 25px rgba(82, 119, 163, 0.2);
}

.site-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.nav-links a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 9px 10px;
    border-radius: 999px;
    color: #cbd5e1;
    font-size: 0.9rem;
    font-weight: 700;
    transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active-link,
.nav-links a[aria-current="page"] {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    gap: 4px;
    flex-direction: column;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 12px;
    background: #1f2937;
    color: #fff;
    cursor: pointer;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.main-content {
    min-height: 70vh;
}

.section {
    padding: 64px 0;
}

.section-tight {
    padding: 36px 0;
}

.section-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 28px;
}

.section-header.centered {
    display: block;
    max-width: 760px;
    margin: 0 auto 30px;
    text-align: center;
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    margin-bottom: 10px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: #166534;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
    margin: 0;
    color: var(--text);
    font-family: "Poppins", Arial, sans-serif;
    line-height: 1.16;
    letter-spacing: 0;
}

h1 {
    font-size: clamp(2.45rem, 7vw, 4.7rem);
}

h2 {
    font-size: clamp(1.85rem, 4vw, 2.65rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin: 0 0 16px;
}

.lead {
    color: var(--muted);
    font-size: 1.08rem;
}

.muted {
    color: var(--muted);
}

.soft-band {
    background: #f3f4f6;
}

.hero {
    padding: 72px 0 44px;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.8fr);
    align-items: center;
    gap: 48px;
}

.hero-copy {
    max-width: 700px;
}

.hero-copy .lead {
    max-width: 580px;
    margin-top: 18px;
    margin-bottom: 28px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-visual {
    min-height: 420px;
    border-radius: 28px;
    background:
        radial-gradient(circle at 20% 20%, rgba(111, 169, 130, 0.24), transparent 32%),
        linear-gradient(135deg, #7fa7cf 0%, #5277a3 52%, #6fa982 100%);
    box-shadow: 0 30px 80px rgba(82, 119, 163, 0.18);
    padding: 28px;
    position: relative;
    overflow: hidden;
}

.hero-visual::before,
.hero-visual::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.22);
}

.hero-visual::before {
    width: 180px;
    height: 180px;
    right: -50px;
    top: -40px;
}

.hero-visual::after {
    width: 120px;
    height: 120px;
    left: -30px;
    bottom: 28px;
}

.visual-card {
    position: relative;
    z-index: 1;
    width: min(310px, 100%);
    margin-left: auto;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 22px;
    box-shadow: 0 22px 50px rgba(17, 24, 39, 0.22);
}

.visual-card + .visual-card {
    margin-top: 20px;
    margin-left: 0;
}

.visual-line {
    height: 12px;
    border-radius: 999px;
    background: #e5e7eb;
    margin-bottom: 12px;
}

.visual-line.short {
    width: 62%;
    background: var(--accent);
}

.visual-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.visual-chip {
    padding: 6px 10px;
    border-radius: 999px;
    background: #edf3f8;
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 800;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    gap: 8px;
    padding: 11px 18px;
    border: 1px solid transparent;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 800;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 14px 30px rgba(82, 119, 163, 0.16);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
}

.btn-secondary {
    background: var(--accent);
    color: #052e16;
    box-shadow: 0 14px 30px rgba(91, 155, 116, 0.16);
}

.btn-secondary:hover {
    background: #4d835f;
    color: #fff;
}

.btn-light,
.btn-ghost {
    background: var(--surface);
    color: var(--text);
    border-color: var(--line);
}

.btn-light:hover,
.btn-ghost:hover {
    border-color: #c7d2fe;
    color: var(--primary);
}

.btn[disabled],
.btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
    transform: none;
    box-shadow: none;
}

.search-panel,
.toolbar-panel,
.form-panel,
.content-panel {
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--surface);
    box-shadow: var(--shadow-soft);
}

.search-panel {
    padding: 18px;
}

.search-box {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 12px;
    min-height: 58px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fff;
    padding: 0 20px;
}

.search-icon {
    color: var(--primary);
    font-weight: 900;
}

.search-box input {
    width: 100%;
    border: 0;
    outline: 0;
    color: var(--text);
    background: transparent;
    font-size: 1rem;
}

.quick-grid,
.notes-grid,
.tips-grid,
.projects-grid,
.resources-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.quick-card,
.note-card,
.tip-card,
.project-card,
.resource-card,
.contact-card,
.info-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.quick-card:hover,
.note-card:hover,
.tip-card:hover,
.project-card:hover,
.resource-card:hover,
.contact-card:hover {
    transform: translateY(-5px);
    border-color: #c7d2fe;
    box-shadow: var(--shadow);
}

.quick-card {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 118px;
    padding: 22px;
    color: var(--text);
}

.card-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--surface-soft);
    color: var(--primary);
}

.card-icon svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.quick-card h3,
.resource-card h3 {
    margin-bottom: 4px;
}

.quick-card p,
.resource-card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.94rem;
}

.note-card,
.tip-card,
.project-card,
.resource-card,
.info-card {
    padding: 20px;
}

.note-card {
    display: flex;
    min-height: 210px;
    flex-direction: column;
    justify-content: space-between;
    gap: 18px;
    --item-accent: #5277a3;
    --item-accent-soft: #edf3f8;
    --item-title: #3f5f86;
    --item-button: #5277a3;
    --item-button-hover: #3f5f86;
}

.note-card h3 {
    margin-bottom: 10px;
    color: var(--item-title);
}

.subject-notes-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.subject-note-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow-soft);
    padding: 28px 30px 30px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    --item-accent: #5277a3;
    --item-accent-soft: #edf3f8;
    --item-title: #3f5f86;
}

.subject-note-card:hover {
    transform: translateY(-4px);
    border-color: #d8e2ec;
    box-shadow: var(--shadow);
}

.subject-note-card h3 {
    margin-bottom: 24px;
    color: var(--item-accent);
    text-align: center;
    font-size: 1.55rem;
}

.note-link-list {
    display: grid;
    gap: 14px;
}

.note-link {
    display: block;
    border: 1px solid #d8e2ec;
    border-radius: 10px;
    background: var(--item-accent-soft);
    color: var(--item-title);
    padding: 14px 16px;
    font-size: 1rem;
    font-weight: 650;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.note-link:hover {
    transform: translateY(-2px);
    border-color: var(--item-accent);
    color: var(--item-title);
}

.note-link[hidden] {
    display: none;
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.tag {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    min-height: 28px;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--item-accent-soft, var(--surface-soft));
    color: var(--item-accent, var(--primary));
    font-size: 0.78rem;
    font-weight: 800;
}

.tag.accent {
    background: var(--accent-soft);
    color: #166534;
}

.note-card .btn-primary,
.project-card .btn-primary {
    background: var(--item-button, var(--primary));
    color: var(--item-button-text, #fff);
    box-shadow: 0 14px 30px rgba(17, 24, 39, 0.12);
}

.note-card .btn-primary:hover,
.project-card .btn-primary:hover {
    background: var(--item-button-hover, var(--primary-dark));
    color: var(--item-button-text, #fff);
}

.note-card[data-subject="Mathematics"],
.subject-note-card[data-subject="Mathematics"],
.project-card[data-project-category="Mathematics"] {
    --item-accent: #4f76a6;
    --item-accent-soft: #e7eef6;
    --item-title: #385a82;
    --item-button: #4f76a6;
    --item-button-hover: #405f85;
}

.note-card[data-subject="Chemistry"],
.subject-note-card[data-subject="Chemistry"],
.project-card[data-project-category="Science"] {
    --item-accent: #4f8995;
    --item-accent-soft: #e5f1f3;
    --item-title: #3d6b74;
    --item-button: #4f8995;
    --item-button-hover: #416f78;
}

.note-card[data-subject="Biology"],
.subject-note-card[data-subject="Biology"] {
    --item-accent: #5f946b;
    --item-accent-soft: #e8f2ea;
    --item-title: #456f4f;
    --item-button: #5f946b;
    --item-button-hover: #4d7957;
}

.note-card[data-subject="Physics"],
.subject-note-card[data-subject="Physics"] {
    --item-accent: #70533f;
    --item-accent-soft: #eee6df;
    --item-title: #4f3829;
    --item-button: #70533f;
    --item-button-hover: #5a4232;
}

.note-card[data-subject="Economics"],
.subject-note-card[data-subject="Economics"],
.project-card[data-project-category="Economics"] {
    --item-accent: #9b833f;
    --item-accent-soft: #f2eddb;
    --item-title: #715f2f;
    --item-button: #9b833f;
    --item-button-hover: #806b32;
}

.note-card[data-subject="History"],
.subject-note-card[data-subject="History"],
.project-card[data-project-category="History"] {
    --item-accent: #a45f7d;
    --item-accent-soft: #f2e7ed;
    --item-title: #7a435b;
    --item-button: #a45f7d;
    --item-button-hover: #854d65;
}

.note-card[data-subject="Civics"],
.subject-note-card[data-subject="Civics"] {
    --item-accent: #b59a48;
    --item-accent-soft: #f5efd8;
    --item-title: #7f6b32;
    --item-button: #d8c16a;
    --item-button-hover: #c4ad55;
    --item-button-text: #3f3518;
}

.project-card[data-project-category="SST"] {
    --item-accent: #7f669d;
    --item-accent-soft: #eee8f4;
    --item-title: #604877;
    --item-button: #7f669d;
    --item-button-hover: #695381;
}

.note-card[data-subject="Geography"],
.subject-note-card[data-subject="Geography"],
.project-card[data-project-category="Geography"] {
    --item-accent: #5b9276;
    --item-accent-soft: #e5f0ea;
    --item-title: #426f58;
    --item-button: #5b9276;
    --item-button-hover: #4b785f;
}

.note-card[data-subject="Science"],
.subject-note-card[data-subject="Science"] {
    --item-accent: #5b85a0;
    --item-accent-soft: #e8f1f6;
    --item-title: #3f6177;
    --item-button: #5b85a0;
    --item-button-hover: #496c83;
}

.project-card[data-project-category="Hindi"] {
    --item-accent: #ad7650;
    --item-accent-soft: #f4eae2;
    --item-title: #7d5439;
    --item-button: #ad7650;
    --item-button-hover: #8c6041;
}

.project-card[data-project-category="English"] {
    --item-accent: #5a928b;
    --item-accent-soft: #e4f1ef;
    --item-title: #406d68;
    --item-button: #5a928b;
    --item-button-hover: #4a7772;
}

.project-card[data-project-category="IT"] {
    --item-accent: #5f6f82;
    --item-accent-soft: #e8edf3;
    --item-title: #465568;
    --item-button: #5f6f82;
    --item-button-hover: #4b5969;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.tips-preview .tip-card {
    min-height: 190px;
}

.tips-preview-panel {
    padding: 28px;
}

.preview-tip-list {
    display: grid;
    gap: 12px;
    margin: 20px 0 24px;
    padding-left: 22px;
}

.preview-tip-list li::marker {
    color: var(--accent);
}

.resources-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.resource-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(280px, 0.55fr);
    gap: 22px;
    align-items: start;
}

.about-list {
    margin: 18px 0 0;
    padding-left: 20px;
}

.notice {
    border: 1px solid #fde68a;
    border-radius: var(--radius-small);
    background: #fffbeb;
    color: #78350f;
    padding: 16px;
}

.notice.success {
    border-color: #bbf7d0;
    background: #f0fdf4;
    color: #14532d;
}

.notice.danger {
    border-color: #fecaca;
    background: #fef2f2;
    color: #7f1d1d;
}

.agreement-gate {
    max-width: 760px;
    margin: 56px auto 24px;
    padding: 32px;
    text-align: center;
}

.policy-check,
.checkbox-line {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    text-align: left;
}

.agreement-gate .policy-check {
    justify-content: center;
    margin: 24px 0;
}

input[type="checkbox"],
input[type="radio"] {
    accent-color: var(--primary);
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: grid;
    place-items: center;
    background: rgba(17, 24, 39, 0.58);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-backdrop.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: min(420px, calc(100% - 32px));
    border-radius: 18px;
    background: var(--surface);
    padding: 28px;
    text-align: center;
    box-shadow: 0 30px 80px rgba(17, 24, 39, 0.25);
}

.page-hero {
    padding: 62px 0 26px;
}

.page-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
    align-items: end;
}

.legal-panel {
    max-width: 880px;
    margin: 0 auto;
    padding: 34px;
}

.legal-panel h2,
.legal-panel h3 {
    margin-top: 30px;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.legal-panel h2:first-child,
.legal-panel h3:first-child {
    margin-top: 0;
}

.legal-panel p {
    margin-bottom: 15px;
}

.legal-panel ul {
    margin: 0 0 18px 22px;
    padding: 0;
}

.legal-panel li {
    margin-bottom: 8px;
}

.legal-meta {
    color: var(--muted);
    font-weight: 700;
    text-align: center;
}

.legal-contact {
    color: var(--primary-dark);
    font-size: 1.08rem;
    font-weight: 800;
    text-align: center;
}

.pdf-resource-panel {
    padding: 30px;
}

.pdf-top-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 12px;
}

.btn-large {
    min-height: 54px;
    padding: 14px 24px;
    font-size: 1.02rem;
}

.pdf-meta-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 28px;
}

.pdf-meta-grid > div {
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    background: #f8fafc;
    padding: 18px;
}

.pdf-meta-grid h2 {
    margin-top: 8px;
    font-size: 1.25rem;
}

.pdf-summary {
    max-width: 760px;
}

.pdf-summary h2 {
    margin-bottom: 10px;
}

.pdf-summary ul {
    margin: 12px 0 18px 22px;
    padding: 0;
}

.pdf-summary li {
    margin-bottom: 8px;
}

.pdf-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 24px 0;
}

.pdf-viewer {
    width: 100%;
    min-height: 680px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #f8fafc;
}

.platform-grid,
.tools-grid,
.community-grid,
.contributors-grid,
.recent-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.platform-card,
.tool-card,
.community-card,
.contributor-card,
.request-card,
.feedback-panel,
.comments-panel {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow-soft);
    padding: 22px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.platform-card:hover,
.request-card:hover,
.contributor-card:hover {
    transform: translateY(-4px);
    border-color: #d8e2ec;
    box-shadow: var(--shadow);
}

.platform-card h3,
.tool-card h3,
.community-card h3,
.contributor-card h3,
.request-card h3 {
    margin: 12px 0 10px;
}

.platform-card p,
.tool-card p,
.community-card p,
.contributor-card p,
.request-card p {
    color: var(--muted);
}

.hub-icon {
    display: inline-grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: var(--surface-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.coming-soon-badge,
.demand-badge,
.contributor-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    border-radius: 999px;
    padding: 5px 10px;
    background: var(--accent-soft);
    color: #2f6b45;
    font-size: 0.76rem;
    font-weight: 800;
}

.tool-card,
.community-card {
    position: relative;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.tool-card.is-locked,
.community-card.is-locked {
    opacity: 0.78;
}

.tool-card.is-locked::after,
.community-card.is-locked::after {
    content: "Locked";
    position: absolute;
    top: 18px;
    right: 18px;
    border-radius: 999px;
    background: #111827;
    color: #fff;
    padding: 4px 9px;
    font-size: 0.72rem;
    font-weight: 800;
}

.tool-card .hub-icon {
    background: #edf3f8;
}

.blurred-preview {
    filter: blur(2px);
    user-select: none;
}

.disabled-action {
    pointer-events: none;
    opacity: 0.55;
}

.request-list {
    display: grid;
    gap: 12px;
    margin-top: 14px;
}

.request-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 14px;
}

.demand-meter {
    width: 110px;
    height: 8px;
    border-radius: 999px;
    background: #e5e7eb;
    overflow: hidden;
}

.demand-meter span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--primary);
}

.feedback-panel,
.comments-panel {
    margin-top: 22px;
}

.feedback-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.feedback-button.is-selected {
    border-color: var(--primary);
    background: var(--surface-soft);
    color: var(--primary-dark);
}

.feedback-note {
    display: none;
    margin-top: 12px;
    color: var(--muted);
}

.feedback-note.is-visible {
    display: block;
}

.comment-list {
    display: grid;
    gap: 14px;
    margin-top: 16px;
}

.comment-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    background: #f8fafc;
    padding: 14px;
}

.comment-card strong {
    display: block;
    margin-bottom: 4px;
}

.comment-box {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.comment-box textarea {
    min-height: 96px;
    resize: vertical;
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    padding: 12px;
}

.toolbar-panel {
    padding: 18px;
    margin-top: 26px;
}

.notes-toolbar {
    display: grid;
    grid-template-columns: minmax(240px, 1fr) auto auto;
    gap: 12px;
    align-items: center;
}

.filter-field {
    display: grid;
    gap: 6px;
}

.filter-field label {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.filter-field select,
.form-field input,
.form-field select,
.form-field textarea,
.contact-form input,
.contact-form textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    background: #fff;
    color: var(--text);
    padding: 12px 14px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.filter-field select:focus,
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus,
.contact-form input:focus,
.contact-form textarea:focus,
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(82, 119, 163, 0.13);
}

.creator-section {
    margin-top: 34px;
}

.creator-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 18px;
}

.creator-title {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.owner-badge {
    display: inline-flex;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.subject-group {
    margin-bottom: 26px;
}

.subject-group h3 {
    margin-bottom: 14px;
    color: var(--group-color, var(--primary-dark));
}

.subject-group[data-subject-group="Mathematics"] {
    --group-color: #4f76a6;
}

.subject-group[data-subject-group="Chemistry"] {
    --group-color: #4f8995;
}

.subject-group[data-subject-group="Biology"] {
    --group-color: #5f946b;
}

.subject-group[data-subject-group="Physics"] {
    --group-color: #70533f;
}

.subject-group[data-subject-group="Economics"] {
    --group-color: #9b833f;
}

.subject-group[data-subject-group="History"] {
    --group-color: #a45f7d;
}

.subject-group[data-subject-group="Civics"] {
    --group-color: #b59a48;
}

.subject-group[data-subject-group="Geography"] {
    --group-color: #5b9276;
}

.subject-group[data-subject-group="Science"] {
    --group-color: #5b85a0;
}

.empty-state {
    border: 1px dashed #c7d2fe;
    border-radius: var(--radius);
    background: #f8fafc;
    padding: 22px;
    color: var(--muted);
    text-align: center;
}

.form-panel {
    padding: 28px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.form-field {
    display: grid;
    gap: 8px;
}

.form-field.full {
    grid-column: 1 / -1;
}

.form-field label,
.contact-form label {
    color: var(--text);
    font-weight: 800;
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.radio-card {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-height: 48px;
    padding: 11px 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius-small);
    background: #fff;
}

.dropzone {
    border: 2px dashed #c7d2fe;
    border-radius: var(--radius);
    background: #f8fafc;
    padding: 24px;
    text-align: center;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.dropzone:hover,
.dropzone.is-dragging {
    border-color: var(--primary);
    background: #edf3f8;
}

.dropzone input {
    margin-top: 14px;
}

.success-message {
    display: none;
    margin-top: 18px;
}

.success-message.is-visible {
    display: block;
}

.project-group + .project-group {
    margin-top: 42px;
}

.projects-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.project-card {
    display: flex;
    min-height: 280px;
    flex-direction: column;
    justify-content: space-between;
    gap: 18px;
    --item-accent: #5277a3;
    --item-accent-soft: #edf3f8;
    --item-title: #3f5f86;
    --item-button: #5277a3;
    --item-button-hover: #3f5f86;
}

.project-card h3 {
    color: var(--item-title);
}

.project-card .creator {
    color: var(--muted);
    font-weight: 700;
}

.tips-page-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.tip-card h3 {
    margin-bottom: 12px;
}

.tip-card.collapsible h3 {
    cursor: pointer;
}

.tip-list-hidden {
    display: none;
}

.tip-list {
    margin: 14px 0 0;
    padding-left: 20px;
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(280px, 1fr);
    gap: 22px;
    align-items: start;
}

.contact-card {
    padding: 24px;
}

.email-line {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.contact-form {
    display: grid;
    gap: 14px;
}

.site-footer {
    margin-top: 56px;
    background: #111827;
    color: #e5e7eb;
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) repeat(2, minmax(180px, 0.6fr));
    gap: 34px;
    padding: 42px 0;
}

.site-footer h3,
.site-footer h4 {
    color: #fff;
    margin-bottom: 12px;
}

.site-footer p {
    color: #cbd5e1;
}

.footer-links {
    display: grid;
    gap: 8px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.footer-links a,
.site-footer a {
    color: #c7d2fe;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px 0;
    color: #cbd5e1;
    font-size: 0.92rem;
}

[hidden] {
    display: none !important;
}

@media (max-width: 980px) {
    .hero-grid,
    .about-layout,
    .contact-grid,
    .page-hero-inner {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        min-height: 330px;
    }

    .pdf-meta-grid {
        grid-template-columns: 1fr;
    }

    .quick-grid,
    .featured-grid,
    .subject-notes-grid,
    .platform-grid,
    .tools-grid,
    .community-grid,
    .contributors-grid,
    .recent-grid,
    .notes-grid,
    .tips-grid,
    .tips-page-grid,
    .projects-grid,
    .resources-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .notes-toolbar {
        grid-template-columns: 1fr 1fr;
    }

    .notes-toolbar .search-panel {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    body.nav-open::after {
        content: "";
        position: fixed;
        inset: 74px 0 0;
        z-index: 900;
        background: rgba(17, 24, 39, 0.22);
    }

    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        position: fixed;
        top: 82px;
        left: 16px;
        right: 16px;
        z-index: 1001;
        display: none;
        border: 1px solid rgba(255, 255, 255, 0.12);
        border-radius: 20px;
        background: #111827;
        box-shadow: var(--shadow);
        padding: 12px;
    }

    .site-nav.is-open {
        display: block;
    }

    .nav-links {
        display: grid;
        gap: 4px;
    }

    .nav-links a {
        border-radius: var(--radius-small);
        justify-content: center;
    }

    .hero {
        padding-top: 48px;
    }

    .hero-copy {
        text-align: left;
    }

    .section {
        padding: 46px 0;
    }

    .section-header,
    .creator-heading {
        display: block;
    }

    .section-header .btn,
    .creator-heading .btn {
        margin-top: 14px;
    }

    .form-grid,
    .notes-toolbar,
    .quick-grid,
    .featured-grid,
    .subject-notes-grid,
    .platform-grid,
    .tools-grid,
    .community-grid,
    .contributors-grid,
    .recent-grid,
    .notes-grid,
    .tips-grid,
    .tips-page-grid,
    .projects-grid,
    .resources-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .search-box {
        border-radius: var(--radius);
    }

    .quick-card {
        min-height: 94px;
    }

    .form-panel,
    .agreement-gate {
        padding: 22px;
    }
}