:root {
    --primary: #2f4a57;
    --secondary: #007c89;
    --accent: #f2c335;

    /* TOKENS (LIGHT) */
    --bg: #f4f6f8;
    --surface: #ffffff;
    --surface-2: #f0f3f6;
    --border: rgba(47, 74, 87, 0.14);

    --text: #0e1b22;
    --muted: rgba(14, 27, 34, 0.68);

    --link: var(--secondary);

    --shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

:root[data-theme="dark"] {
    --bg: #0b1220;
    --surface: #0f1b2e;
    --surface-2: #13243a;
    --border: rgba(242, 195, 53, 0.16);

    --text: #f4f6f8;
    --muted: rgba(244, 246, 248, 0.72);

    --link: #67d6df;

    --shadow: 0 14px 34px rgba(0, 0, 0, 0.42);
}

* {
    box-sizing: border-box;
}
html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family:
        ui-sans-serif,
        system-ui,
        -apple-system,
        Segoe UI,
        Roboto,
        Arial;
    color: var(--text);

    background:
        radial-gradient(
            900px 500px at 12% -10%,
            rgba(30, 64, 175, 0.1),
            transparent 60%
        ),
        radial-gradient(
            700px 450px at 92% 12%,
            rgba(30, 64, 175, 0.07),
            transparent 55%
        ),
        radial-gradient(
            800px 520px at 50% 120%,
            rgba(100, 116, 139, 0.08),
            transparent 55%
        ),
        var(--bg);
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 18px;
}
.sep {
    height: 1px;
    background: var(--border);
    opacity: 1;
    margin: 18px 0;
}

main {
    padding: 42px 0 60px;
}

header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(249, 250, 251, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.headerbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    letter-spacing: 0.4px;
    font-size: 18px;
}

.badge-dot {
    width: 16px;
    height: 16px;
    border-radius: 999px;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(242, 195, 53, 0.2);
}

.actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav {
    display: flex;
    gap: 8px;
    font-size: 14px;
    color: var(--muted);
}
.nav a {
    padding: 8px 10px;
    border-radius: 10px;
}
.nav a:hover {
    background: rgba(30, 64, 175, 0.08);
    color: var(--text);
}
.nav a.active {
    background: rgba(30, 64, 175, 0.1);
    border: 1px solid rgba(30, 64, 175, 0.18);
    color: var(--text);
}

.dropdown {
    position: relative;
}
.dropdown::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 30px;
    display: block;
    pointer-events: all;
}

.dropbtn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 10px;
    color: var(--muted);
    cursor: pointer;
    user-select: none;
}
.dropbtn:hover {
    background: rgba(30, 64, 175, 0.08);
    color: var(--text);
}
.dropbtn::after {
    content: "▾";
    font-size: 12px;
    opacity: 0.9;
}

.dropdown-content {
    display: block;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 260px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
    z-index: 999;

    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);

    transition:
        opacity 0.2s ease,
        transform 0.2s ease,
        visibility 0.2s;
    transition-delay: 0.3s;
}
.dropdown-content a {
    display: block;
    padding: 12px 14px;
    font-size: 14px;
    border-top: 1px solid var(--border);
}
.dropdown-content a:hover {
    background: rgba(30, 64, 175, 0.08);
}
.dropdown:hover .dropdown-content,
.dropdown:focus-within .dropdown-content {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
}

.search {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 38px;
    padding: 0 12px;
    border-radius: 12px;
    background: var(--panel2);
    border: 1px solid var(--border);
}
.search input {
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--text);
    width: auto !important;
    flex: 1 1 auto;
    min-width: 0;
}
.search input::placeholder {
    color: rgba(100, 116, 139, 0.75);
}
.search button {
    border: 0;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    margin-left: auto;
}

@media (max-width: 0px) {
    .nav {
        display: flex;
    }
    .search {
        display: flex;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 800;
    font-size: 14px;
    line-height: 1;
    border: 1px solid transparent;
    transition:
        transform 0.08s ease,
        background 0.15s ease,
        opacity 0.15s ease,
        box-shadow 0.15s ease;
    user-select: none;
}
.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.18);
}
.btn-primary:hover {
    background: var(--brand-2);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-ghost:hover {
    background: var(--brand-soft);
    border-color: rgba(30, 64, 175, 0.18);
}

.hero {
    padding: 26px 0 6px;
}

.h1 {
    font-size: clamp(34px, 5vw, 54px);
    line-height: 1.05;
    margin: 0;
    letter-spacing: -0.02em;
    font-weight: 800;
}
.sub {
    margin: 14px 0 0;
    max-width: 68ch;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.75;
}

.section-title {
    margin: 26px 0 10px;
    font-size: 22px;
    font-weight: 800;
}
.section-sub {
    margin: 0 0 14px;
    max-width: 75ch;
    color: var(--muted);
}

.kicker {
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}
.title {
    margin: 8px 0 0;
    font-size: 18px;
    font-weight: 900;
}
.small {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.7;
}

.pill {
    font-size: 12px;
    color: var(--muted);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.65);
    padding: 7px 10px;
    border-radius: 999px;
}

.card {
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 16px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.card:hover {
    border-color: rgba(30, 64, 175, 0.2);
}
.card.soft {
    background: var(--panel2);
    box-shadow: none;
}

.grid {
    display: grid;
    gap: 16px;
}
.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}
@media (max-width: 960px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

.icon,
.avatar {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-weight: 950;
    letter-spacing: 0.04em;
    background: var(--brand-soft);
    border: 1px solid rgba(30, 64, 175, 0.18);
    color: var(--brand);
}

.form {
    display: grid;
    gap: 10px;
    margin-top: 12px;
}
.input,
.textarea {
    width: 100%;
    padding: 12px 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--panel2);
    color: var(--text);
    outline: none;
}
.input::placeholder,
.textarea::placeholder {
    color: rgba(100, 116, 139, 0.8);
}
.input:focus,
.textarea:focus {
    border-color: rgba(30, 64, 175, 0.35);
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.1);
}
textarea.input,
.textarea {
    resize: vertical;
}

footer {
    border-top: 1px solid var(--border);
    padding: 26px 0;
    color: var(--muted);
    font-size: 14px;
    background: rgba(30, 64, 175, 0.03);
}
.foot {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.quickwrap {
    display: flex;
    justify-content: center;
}
.quickgrid {
    width: 100%;
    max-width: 860px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}
@media (max-width: 960px) {
    .quickgrid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (max-width: 520px) {
    .quickgrid {
        grid-template-columns: 1fr;
    }
}

.awCard .title {
    line-height: 1.25;
}
.awCard .small {
    margin: 8px 0 0;
}

@media (max-width: 960px) {
    .pdf-wrap iframe {
        height: 520px !important;
    }
}

.slider {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    margin-top: 14px;
    border: 1px solid var(--border);
    background: var(--panel2);
}

.slides {
    display: flex;
    width: 100%;
    transition: transform 0.45s ease;
}

.slide {
    min-width: 100%;
    height: 360px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.slide .overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        rgba(11, 31, 58, 0.7),
        rgba(11, 31, 58, 0.3),
        rgba(11, 31, 58, 0.1)
    );
}

.slideContent {
    position: absolute;
    left: 18px;
    bottom: 18px;
    max-width: 560px;
    color: #fff;
    padding: 16px;
    border-radius: 16px;
    background: rgba(11, 31, 58, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.16);
    backdrop-filter: blur(10px);
}

.slideTitle {
    font-weight: 950;
    font-size: 26px;
    margin-top: 8px;
    line-height: 1.15;
}
.slideText {
    margin-top: 10px;
    opacity: 0.95;
    line-height: 1.6;
    font-size: 14px;
}

.navBtn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(11, 31, 58, 0.35);
    color: #fff;
    font-size: 26px;
    cursor: pointer;
    display: grid;
    place-items: center;
}
.navBtn:hover {
    background: rgba(11, 31, 58, 0.5);
}

.navBtn.prev {
    left: 12px;
}
.navBtn.next {
    right: 12px;
}

.dots {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 12px;
    display: flex;
    justify-content: center;
    gap: 8px;
}
.dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.45);
    background: rgba(255, 255, 255, 0.22);
    cursor: pointer;
}
.dot.active {
    background: #fff;
    border-color: #fff;
}

@media (max-width: 960px) {
    .slide {
        height: 300px;
    }
    .slideContent {
        max-width: 92%;
    }
}

.longpage {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 960px) {
    .longpage {
        grid-template-columns: 1fr;
    }
}

.stickyCard {
    position: sticky;
    top: 92px;
}

.toc a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--panel2);
    margin-top: 10px;
    font-size: 14px;
    color: var(--text);
}
.toc a:hover {
    background: var(--brand-soft);
    border-color: rgba(30, 64, 175, 0.18);
}

details.acc {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--panel2);
    padding: 0;
    overflow: hidden;
}
details.acc + details.acc {
    margin-top: 12px;
}

details.acc summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 16px;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
details.acc summary::-webkit-details-marker {
    display: none;
}

details.acc summary::after {
    content: "＋";
    font-weight: 900;
    color: var(--brand);
}
details.acc[open] summary::after {
    content: "—";
}

.accBody {
    padding: 0 16px 16px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    line-height: 1.8;
    font-size: 14px;
}

.accBody ul {
    margin: 10px 0 0 18px;
}
.accBody li {
    margin: 6px 0;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    border: 1px solid var(--border);
    background: var(--panel2);
    color: var(--muted);
}

.anchor {
    scroll-margin-top: 110px;
    position: relative;
    top: -1px;
    height: 0;
}

.anchor:target + details.acc summary {
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.1);
}
.anchor {
    scroll-margin-top: 110px;
    height: 0;
}

:root[data-theme="dark"] {
    --text: #f8fafc;
    --muted: rgba(248, 250, 252, 0.82);
    --nav-text: rgba(248, 250, 252, 0.88);
    --nav-text-hover: rgba(248, 250, 252, 1);

    --border: rgba(242, 195, 53, 0.24);
    --surface: #0f1e33;
    --surface-2: #152c46;
    --header-bg: rgba(15, 30, 51, 0.82);

    --input-bg: rgba(21, 44, 70, 0.92);
    --input-border: rgba(242, 195, 53, 0.26);
    --placeholder: rgba(248, 250, 252, 0.62);

    --chip-bg: rgba(242, 195, 53, 0.12);
    --chip-border: rgba(242, 195, 53, 0.24);
    --chip-text: rgba(248, 250, 252, 0.94);
}

:root[data-theme="dark"] p,
:root[data-theme="dark"] li,
:root[data-theme="dark"] .small,
:root[data-theme="dark"] .section-sub,
:root[data-theme="dark"] .sub {
    color: var(--muted);
}

:root[data-theme="dark"] h1,
:root[data-theme="dark"] h2,
:root[data-theme="dark"] h3,
:root[data-theme="dark"] .h1,
:root[data-theme="dark"] .section-title,
:root[data-theme="dark"] .title {
    color: var(--text);
}

:root[data-theme="dark"] .dropdown-content a {
    color: var(--text);
}

:root[data-theme="dark"] .pill,
:root[data-theme="dark"] .badge {
    color: var(--chip-text) !important;
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] textarea,
:root[data-theme="dark"] select {
    color: var(--text);
}

:root[data-theme="dark"] .slide .overlay {
    background: linear-gradient(
        90deg,
        rgba(11, 18, 32, 0.78) 0%,
        rgba(11, 18, 32, 0.55) 55%,
        rgba(11, 18, 32, 0.3) 100%
    );
}

:root[data-theme="dark"] .slideContent {
    color: var(--text);
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.55);
}
:root[data-theme="dark"] .slideTitle {
    color: var(--text);
}
:root[data-theme="dark"] .slideText {
    color: rgba(248, 250, 252, 0.86);
}

:root[data-theme="dark"] header,
:root[data-theme="dark"] .headerbar,
:root[data-theme="dark"] .container.headerbar {
    background: var(--header-bg) !important;
    border-bottom: 1px solid var(--border) !important;
}

:root[data-theme="dark"] .nav,
:root[data-theme="dark"] nav.nav {
    background: transparent !important;
}

:root[data-theme="dark"] .nav a,
:root[data-theme="dark"] .dropbtn {
    color: var(--nav-text) !important;
}

:root[data-theme="dark"] .nav a:hover,
:root[data-theme="dark"] .dropbtn:hover {
    color: var(--nav-text-hover) !important;
}

:root[data-theme="dark"] .nav a.active {
    background: var(--active-bg) !important;
    border: 1px solid var(--active-border) !important;
    color: var(--nav-text-hover) !important;
    box-shadow: none !important;
}

:root[data-theme="dark"] .dropdown-content {
    background: var(--dropdown-bg) !important;
    border: 1px solid var(--dropdown-border) !important;
}
:root[data-theme="dark"] .dropdown-content a {
    color: var(--text) !important;
}
:root[data-theme="dark"] .dropdown-content a:hover {
    background: var(--dropdown-item-hover) !important;
}

:root[data-theme="dark"] header .btn-ghost {
    color: var(--text) !important;
}
:root[data-theme="dark"] header .btn-ghost:hover {
    background: rgba(242, 195, 53, 0.1) !important;
}

:root[data-theme="dark"] header input {
    background: var(--input-bg) !important;
    border-color: var(--input-border) !important;
    color: var(--text) !important;
}
:root[data-theme="dark"] header input::placeholder {
    color: var(--placeholder) !important;
}

header .headerbar > a.btn.btn-primary {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    visibility: visible !important;
    opacity: 1 !important;
}

header .headerbar > a.btn.btn-primary:first-of-type {
    display: none !important;
}
header .headerbar > a.btn.btn-primary:last-of-type {
    display: inline-flex !important;
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 50px;
}

.brand-logo {
    height: 60px;
    width: auto;
    display: block;
    image-rendering: auto;
    filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.35));
}

:root[data-theme="dark"] .brand-logo {
    filter: brightness(1.25) contrast(1.15)
        drop-shadow(0 8px 18px rgba(0, 0, 0, 0.45));
}

@media (max-width: 960px) {
    .brand-logo {
        height: 50px;
    }
}
@media (max-width: 520px) {
    .brand-logo {
        height: 50px;
    }
}

:root[data-theme="dark"] header {
    border-bottom: 0 !important;
}

:root[data-theme="dark"] {
    color-scheme: dark;
}
:root:not([data-theme="dark"]) {
    color-scheme: light;
}

:root[data-theme="dark"] select {
    background: var(--input-bg) !important;
    border-color: var(--input-border) !important;
    color: var(--text) !important;
}

:root[data-theme="dark"] select option {
    background: var(--surface) !important;
    color: var(--text) !important;
}

:root[data-theme="dark"] select optgroup {
    background: var(--surface) !important;
    color: var(--muted) !important;
}

.presentation-page .toc a {
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
    background: var(--surface);
}

.presentation-page .toc a .num {
    font-size: 10px;
    font-weight: 900;
    opacity: 0.4;
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 4px;
}

.presentation-page .toc a:hover {
    transform: translateX(5px);
    border-color: var(--secondary);
    color: var(--secondary);
    box-shadow: var(--shadow);
}

.presentation-page .custom-acc {
    transition: all 0.3s ease;
    border-left: 4px solid var(--primary) !important;
}

.presentation-page .custom-acc[open] {
    box-shadow: var(--shadow);
    background: var(--surface);
}

.presentation-page .custom-acc summary {
    font-size: 18px;
    padding: 20px;
    color: var(--primary);
}

.presentation-page .bento-inner {
    border-top: 2px solid var(--accent);
    transition: transform 0.2s ease;
}

.presentation-page .bento-inner:hover {
    transform: translateY(-3px);
}

.activity-list {
    list-style: none;
    padding: 0 !important;
    margin: 0 !important;
}

.activity-list li {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border);
    position: relative;
    padding-left: 25px;
}

.activity-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 20px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--secondary);
}

.activity-list li:last-child {
    border-bottom: none;
}

:root[data-theme="dark"] .presentation-page .custom-acc summary {
    color: var(--accent);
}

:root[data-theme="dark"] .presentation-page .custom-acc {
    border-left-color: var(--accent) !important;
}