/* ============================================
   PAGE TOKENS — Roadmap
   ============================================ */
:root {
    --container-max: 1024px;
    --section-padding: 100px 48px;
    --rm-green: var(--color-green);
    --rm-purple: var(--color-purple);
    --rm-orange: var(--color-orange);
    --rm-pink: var(--color-pink);
}

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--color-black);
    color: var(--color-gray-900);
    overflow-x: hidden;
}

::selection {
    background: rgba(41, 151, 255, 0.3);
    color: inherit;
}

img, svg {
    display: block;
    max-width: 100%;
}

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

:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
    [data-anim] { opacity: 1; transform: none; }
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
}

/* ============================================
   SECTION HEADER — page spacing
   ============================================ */
.section-headline {
    margin-bottom: 28px;
}

.section-desc {
    margin-bottom: 24px;
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
[data-anim="fade-up"] {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

[data-anim="fade-up"].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   READING PROGRESS BAR
   ============================================ */
.rm-progress {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    height: 2px;
    width: 0%;
    background: linear-gradient(90deg, var(--color-green), var(--color-purple));
    z-index: 100;
    transition: width 0.1s linear;
}

/* ============================================
   HERO
   ============================================ */
.rm-hero {
    padding: calc(var(--nav-height) + 80px) 24px 120px;
    text-align: center;
    background: var(--color-black);
    position: relative;
    overflow: hidden;
}

.rm-hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1000px;
    height: 1000px;
    background: radial-gradient(
        ellipse at center,
        rgba(48, 209, 88, 0.07) 0%,
        rgba(191, 90, 242, 0.04) 30%,
        transparent 70%
    );
    pointer-events: none;
    animation: rm-hero-glow 8s ease-in-out infinite alternate;
}

@keyframes rm-hero-glow {
    0%   { transform: translate(-50%, -50%) scale(1);    opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.15); opacity: 0.7; }
}

.rm-hero__badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-green);
    background: var(--color-green-a10);
    border: 1px solid var(--color-green-a15);
    border-radius: var(--border-radius-pill);
    padding: 6px 18px;
    margin-bottom: 28px;
}

.rm-hero__title {
    font-family: var(--font-display);
    font-size: clamp(40px, 7vw, 64px);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    color: var(--color-gray-50);
    margin-bottom: 20px;
    position: relative;
}

.rm-hero__title-gradient {
    background: linear-gradient(90deg, var(--color-green), var(--color-teal), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 100%;
    animation: rm-gradient-shift 6s ease infinite;
}

@keyframes rm-gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50%      { background-position: 100% 50%; }
}

.rm-hero__subtitle {
    font-size: clamp(16px, 2.2vw, 19px);
    color: var(--color-gray-400);
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.rm-hero__stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    position: relative;
}

.rm-hero__stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.rm-hero__stat-val {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    color: var(--color-gray-100);
}

.rm-hero__stat-label {
    font-size: 11px;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ============================================
   SECTIONS — Shared Padding
   ============================================ */
.rm-section {
    padding: var(--section-padding);
}

.rm-section .container {
    max-width: 960px;
}

/* ============================================
   CONTROLS — Filter + Progress Summary
   ============================================ */
.rm-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}

.rm-filter {
    display: flex;
    gap: 8px;
}

.rm-filter__btn {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: 8px 20px;
    border-radius: var(--border-radius-pill);
    border: 1px solid var(--color-white-a12);
    background: transparent;
    color: var(--color-gray-400);
    cursor: pointer;
    transition: all 0.3s;
}

.rm-filter__btn:hover {
    border-color: var(--color-white-a20);
    color: var(--color-gray-200);
}

.rm-filter__btn.is-active {
    background: var(--color-green-a15);
    border-color: var(--color-green);
    color: var(--color-green);
}

.rm-progress-summary {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-gray-400);
    display: flex;
    align-items: center;
    gap: 10px;
}

.rm-progress-summary__bar {
    width: 120px;
    height: 4px;
    background: var(--color-white-a8);
    border-radius: 2px;
    overflow: hidden;
}

.rm-progress-summary__fill {
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--color-green), var(--color-teal));
    border-radius: 2px;
    transition: width 0.4s var(--ease-out-quart);
}

/* ============================================
   SKILL TREE
   ============================================ */
.rm-flowchart {
    position: relative;
}

.rm-tree {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

/* Tier connector line between tiers */
.rm-tree__connector {
    height: 32px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rm-tree__connector::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-white-a10), var(--color-white-a6));
    transform: translateX(-50%);
}

.rm-tree__connector::after {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-white-a15);
    position: relative;
    z-index: 1;
}

/* Tier band */
.rm-tree__tier {
    position: relative;
    z-index: 1;
    padding: 28px 0;
}

.rm-tree__tier-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.rm-tree__tier-num {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 3px 10px;
    border-radius: var(--border-radius-pill);
}

.rm-tree__tier[data-tier="1"] .rm-tree__tier-num {
    color: var(--rm-green);
    background: var(--color-green-a10);
}
.rm-tree__tier[data-tier="2"] .rm-tree__tier-num {
    color: var(--rm-purple);
    background: var(--color-purple-a10);
}
.rm-tree__tier[data-tier="3"] .rm-tree__tier-num {
    color: var(--rm-orange);
    background: var(--color-orange-a10);
}
.rm-tree__tier[data-tier="4"] .rm-tree__tier-num {
    color: var(--rm-pink);
    background: var(--color-pink-a10);
}

.rm-tree__tier-name {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.rm-tree__tier[data-tier="1"] .rm-tree__tier-name { color: var(--rm-green); }
.rm-tree__tier[data-tier="2"] .rm-tree__tier-name { color: var(--rm-purple); }
.rm-tree__tier[data-tier="3"] .rm-tree__tier-name { color: var(--rm-orange); }
.rm-tree__tier[data-tier="4"] .rm-tree__tier-name { color: var(--rm-pink); }

/* Node grid */
.rm-tree__nodes {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}

.rm-tree__node-wrap {
    position: relative;
    z-index: 1;
}

/* ============================================
   SKILL TREE NODES
   ============================================ */
.rm-node {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    width: 100%;
    text-align: left;
    font: inherit;
    color: inherit;
    background: var(--color-white-a4);
    border: 1px solid var(--color-white-a8);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.rm-node:hover {
    border-color: var(--color-white-a15);
    background: var(--color-white-a6);
    transform: translateY(-2px);
}

.rm-node.is-active {
    border-color: var(--color-white-a20);
    background: var(--color-white-a8);
}

/* Tier-colored left border accent on active */
.rm-node[data-accent="green"].is-active { border-left: 3px solid var(--rm-green); }
.rm-node[data-accent="purple"].is-active { border-left: 3px solid var(--rm-purple); }
.rm-node[data-accent="orange"].is-active { border-left: 3px solid var(--rm-orange); }
.rm-node[data-accent="pink"].is-active { border-left: 3px solid var(--rm-pink); }

/* Glow on hover per tier */
.rm-node[data-accent="green"]:hover { box-shadow: 0 4px 20px rgba(48, 209, 88, 0.1); }
.rm-node[data-accent="purple"]:hover { box-shadow: 0 4px 20px rgba(191, 90, 242, 0.1); }
.rm-node[data-accent="orange"]:hover { box-shadow: 0 4px 20px rgba(255, 159, 10, 0.1); }
.rm-node[data-accent="pink"]:hover { box-shadow: 0 4px 20px rgba(255, 55, 95, 0.1); }

.rm-node__ring {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    position: relative;
}

.rm-node__ring svg {
    width: 40px;
    height: 40px;
    transform: rotate(-90deg);
}

.rm-node__ring-bg {
    fill: none;
    stroke: var(--color-white-a10);
    stroke-width: 3;
}

.rm-node__ring-fill {
    fill: none;
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke-dasharray 0.5s var(--ease-out-quart);
}

.rm-tree__tier[data-tier="1"] .rm-node__ring-fill { stroke: var(--rm-green); }
.rm-tree__tier[data-tier="2"] .rm-node__ring-fill { stroke: var(--rm-purple); }
.rm-tree__tier[data-tier="3"] .rm-node__ring-fill { stroke: var(--rm-orange); }
.rm-tree__tier[data-tier="4"] .rm-node__ring-fill { stroke: var(--rm-pink); }

.rm-node__ring-icon {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.rm-node__info {
    flex: 1;
    min-width: 0;
}

.rm-node__title {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gray-100);
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rm-node__count {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-gray-500);
    margin-top: 2px;
}

.rm-node__chevron {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    color: var(--color-gray-500);
    transition: transform 0.3s, color 0.3s;
}

.rm-node.is-active .rm-node__chevron {
    transform: rotate(180deg);
    color: var(--color-gray-200);
}

/* ============================================
   DETAIL PANEL (expands below node)
   ============================================ */
.rm-detail {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.rm-detail.is-open {
    grid-template-rows: 1fr;
}

.rm-detail__inner {
    overflow: hidden;
}

.rm-detail__content {
    padding: 16px 0 8px;
}

.rm-detail__prereqs {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-gray-500);
    padding: 8px 12px;
    background: var(--color-white-a4);
    border-radius: 8px;
    margin-bottom: 12px;
}

.rm-detail__prereqs-label {
    color: var(--color-gray-400);
    font-weight: 500;
}

.rm-detail__topics {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 8px;
}

/* ============================================
   DOMAIN CARDS (Tier Sections)
   ============================================ */
.rm-domains {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 40px;
}

.rm-domain {
    background: var(--color-white-a4);
    border: 1px solid var(--color-white-a8);
    border-radius: var(--border-radius-card);
    overflow: hidden;
    transition: border-color var(--transition-card);
}

.rm-domain:hover {
    border-color: var(--color-white-a12);
}

.rm-domain__toggle {
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    padding: 24px 28px;
    display: flex;
    align-items: center;
    gap: 16px;
    font: inherit;
    color: inherit;
}

.rm-domain__toggle:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: -2px;
}

.rm-domain__icon {
    font-size: 24px;
    flex-shrink: 0;
}

.rm-domain__info {
    flex: 1;
    min-width: 0;
}

.rm-domain__title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-gray-50);
}

.rm-domain__meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-gray-500);
    margin-top: 2px;
}

.rm-domain__chevron {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    color: var(--color-gray-500);
    transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s;
}

.rm-domain.is-expanded .rm-domain__chevron {
    transform: rotate(180deg);
    color: var(--color-blue);
}

.rm-domain__toggle:hover .rm-domain__chevron {
    color: var(--color-blue);
}

/* Collapsible body */
.rm-domain__body {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.rm-domain.is-expanded .rm-domain__body {
    grid-template-rows: 1fr;
}

.rm-domain__body-inner {
    overflow: hidden;
}

.rm-domain__topics {
    padding: 0 28px 28px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.rm-domain__prereqs {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-gray-500);
    padding: 6px 12px;
    background: var(--color-white-a4);
    border-radius: 8px;
    margin: 0 28px 12px;
    display: inline-block;
}

.rm-domain__desc {
    font-size: 14px;
    color: var(--color-gray-400);
    line-height: 1.55;
    padding: 0 28px 20px;
    font-weight: 300;
}

/* ============================================
   TOPIC CHECKBOXES
   ============================================ */
.rm-topic {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    transition: background 0.2s;
    cursor: pointer;
}

.rm-topic:hover {
    background: var(--color-white-a4);
}

.rm-topic__check {
    position: relative;
    flex-shrink: 0;
    margin-top: 2px;
}

.rm-topic__check input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.rm-topic__box {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    border: 2px solid var(--color-white-a15);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s;
}

.rm-topic__check input:checked + .rm-topic__box {
    background: var(--color-green);
    border-color: var(--color-green);
}

.rm-topic__box::after {
    content: '';
    width: 10px;
    height: 6px;
    border-left: 2px solid transparent;
    border-bottom: 2px solid transparent;
    transform: rotate(-45deg) translate(1px, -1px);
    transition: border-color 0.25s;
}

.rm-topic__check input:checked + .rm-topic__box::after {
    border-left-color: #fff;
    border-bottom-color: #fff;
}

.rm-topic__check input:focus-visible + .rm-topic__box {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
}

.rm-topic__text {
    flex: 1;
    min-width: 0;
}

.rm-topic__name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-100);
    line-height: 1.3;
    transition: opacity 0.3s, text-decoration-color 0.3s;
}

.rm-topic__sub {
    font-size: 12px;
    color: var(--color-gray-500);
    margin-top: 2px;
    line-height: 1.4;
}

.rm-topic.is-checked .rm-topic__name {
    text-decoration: line-through;
    text-decoration-color: var(--color-gray-500);
    opacity: 0.5;
}

.rm-topic.is-checked .rm-topic__sub {
    opacity: 0.4;
}

/* ============================================
   TIER SECTION HEADERS
   ============================================ */
.rm-tier-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.rm-tier-header__badge {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
}

.rm-tier-header__badge--1 {
    color: var(--rm-green);
    background: var(--color-green-a10);
}

.rm-tier-header__badge--2 {
    color: var(--rm-purple);
    background: var(--color-purple-a10);
}

.rm-tier-header__badge--3 {
    color: var(--rm-orange);
    background: var(--color-orange-a10);
}

.rm-tier-header__badge--4 {
    color: var(--rm-pink);
    background: var(--color-pink-a10);
}

/* ============================================
   FOOTER
   ============================================ */
.rm-footer {
    padding: 32px 48px;
    background: var(--color-black);
    border-top: var(--border-dark);
    text-align: center;
}

.rm-footer__links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
}

.rm-footer__link {
    font-size: 13px;
    color: var(--color-gray-400);
    transition: color 0.3s;
}

.rm-footer__link:hover { color: var(--color-gray-50); }

.rm-footer__copy {
    font-size: 12px;
    color: var(--color-gray-600);
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 900px) {
    .rm-tree__nodes {
        grid-template-columns: repeat(2, 1fr);
    }

    .rm-detail__topics {
        grid-template-columns: 1fr 1fr;
    }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 640px) {
    .rm-section { padding: 64px 20px; }

    .rm-hero {
        padding: calc(var(--nav-height) + 48px) 20px 48px;
    }

    .rm-hero__stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .hero__scroll { display: none; }

    .rm-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .rm-filter {
        flex-wrap: wrap;
    }

    .rm-progress-summary {
        justify-content: center;
    }

    .rm-tree__nodes {
        grid-template-columns: 1fr;
    }

    .rm-tree__connector {
        height: 20px;
    }

    .rm-detail__topics {
        grid-template-columns: 1fr;
    }

    .rm-domain__toggle {
        padding: 20px;
    }

    .rm-domain__topics {
        padding: 0 20px 20px;
    }

    .rm-domain__desc {
        padding: 0 20px 16px;
    }

    .rm-domain__title {
        font-size: 16px;
    }

    .rm-footer { padding: 24px 20px; }
    .rm-footer__links { flex-direction: column; gap: 12px; }
}

/* ============================================
   PRINT
   ============================================ */
@media print {
    .nav, .rm-progress, .g-btt, .hero__scroll, .rm-controls { display: none; }
    .rm-hero { padding-top: 40px; }
    body { background: #fff; }
    .s-light { background: #fff; color: #000; }
    [data-anim] { opacity: 1; transform: none; }
    .rm-node__ring { display: none; }
    .rm-domain__body { grid-template-rows: 1fr; }
    .rm-detail { grid-template-rows: 1fr; }
}