@charset "UTF-8";

:root {
    --color-ink: #1b1d1c;
    --color-paper: #f2f0e8;
    --color-line: rgba(27, 29, 28, 0.2);
    --color-accent: #ff5c35;
    --color-night: #101820;
    --color-sage: #c6d1bc;
    --color-rose: #f3c8cf;
    --color-lavender: #e4d9ff;
    --font-sans: "Helvetica Neue", Helvetica, Arial, "Hiragino Sans", sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-ink);
    background: var(--color-paper);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}

button,
a {
    color: inherit;
}

a {
    text-decoration: none;
}

.l-inner {
    width: min(90vw, 1280px);
    margin-inline: auto;
}

.l-header {
    position: fixed;
    z-index: 50;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 5vw;
    color: var(--color-paper);
    mix-blend-mode: difference;
    pointer-events: none;
}

.l-header__title {
    margin: 0;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.18em;
}

.p-intro {
    display: grid;
    min-height: 100svh;
    padding-block: 120px 56px;
    align-items: end;
    background:
        linear-gradient(90deg, transparent 0 calc(50% - 0.5px), var(--color-line) calc(50% - 0.5px) calc(50% + 0.5px), transparent calc(50% + 0.5px)),
        var(--color-paper);
}

.p-intro__eyebrow {
    margin: 0 0 20px;
    color: var(--color-accent);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.2em;
}

.p-intro__title {
    margin: 0;
    font-size: clamp(3.5rem, 14vw, 11rem);
    font-weight: 500;
    letter-spacing: -0.07em;
    line-height: 0.82;
}

.p-intro__lead {
    max-width: 33rem;
    margin: 32px 0 0;
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    line-height: 1.9;
}

.p-intro__nav {
    display: grid;
    margin-top: 56px;
    border-top: 1px solid var(--color-line);
}

.p-intro__link {
    display: flex;
    justify-content: space-between;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-line);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    transition: padding 0.3s ease, color 0.3s ease;
}

.p-intro__link::after {
    content: "↘";
}

.p-demo {
    position: relative;
    min-height: 100svh;
}

.p-demo__inner {
    display: grid;
    min-height: 100svh;
}

.p-demo__copy,
.p-demo__stage {
    display: flex;
    min-width: 0;
    padding: 56px 5vw;
}

.p-demo__copy {
    flex-direction: column;
    justify-content: flex-end;
    min-height: 42svh;
}

.p-demo__number {
    margin: 0 auto auto 0;
    font-size: 0.75rem;
    letter-spacing: 0.16em;
}

.p-demo__title {
    margin: 0;
    font-size: clamp(2.75rem, 8vw, 7.5rem);
    font-weight: 500;
    letter-spacing: -0.06em;
    line-height: 0.9;
}

.p-demo__description {
    max-width: 28rem;
    margin: 28px 0 0;
    font-size: 0.875rem;
    line-height: 1.8;
}

.p-demo__code {
    margin: 16px 0 0;
    font-size: 0.75rem;
    opacity: 0.7;
}

.p-demo__code code {
    padding: 4px 8px;
    background: rgba(27, 29, 28, 0.08);
    border-radius: 4px;
}

.p-demo__stage {
    position: relative;
    min-height: 58svh;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 各セクションの配色 */
.p-demo--simple {
    color: var(--color-paper);
    background: var(--color-ink);
}

.p-demo--simple .p-demo__stage {
    background: var(--color-accent);
}

.p-demo--simple .p-demo__code code {
    background: rgba(242, 240, 232, 0.15);
}

.p-demo--rotation {
    background: var(--color-sage);
}

.p-demo--rotation .p-demo__stage {
    background: var(--color-night);
}

.p-demo--pivot {
    color: var(--color-ink);
    background: var(--color-paper);
}

.p-demo--pivot .p-demo__stage {
    background: var(--color-lavender);
}

.p-demo--morph {
    color: var(--color-paper);
    background: var(--color-night);
}

.p-demo--morph .p-demo__stage {
    background: var(--color-paper);
}

.p-demo--morph .p-demo__code code {
    background: rgba(242, 240, 232, 0.15);
}

.p-demo--burst {
    background: var(--color-rose);
}

.p-demo--burst .p-demo__stage {
    background: var(--color-ink);
}

.p-demo--flip {
    color: var(--color-ink);
    background: var(--color-paper);
}

.p-demo--flip .p-demo__stage {
    background: var(--color-sage);
}

.p-demo--slide {
    color: var(--color-paper);
    background: var(--color-ink);
}

.p-demo--slide .p-demo__stage {
    background: var(--color-rose);
}

.p-demo--slide .p-demo__code code {
    background: rgba(242, 240, 232, 0.15);
}

.p-demo--twist {
    background: var(--color-lavender);
}

.p-demo--twist .p-demo__stage {
    background: var(--color-night);
}

.p-demo--wipe {
    color: var(--color-paper);
    background: var(--color-ink);
}

.p-demo--wipe .p-demo__stage {
    background: var(--color-night);
}

.p-demo--wipe .p-demo__code code {
    background: rgba(242, 240, 232, 0.15);
}

/* =========================================
   ハンバーガーメニュー本体
   元記事の実装（56x44 / バー40x3）を踏襲し、
   デモ用にstage上で拡大表示している
   ========================================= */
.c-hamburger {
    --hamburger-bg: #e0e0e0;
    --hamburger-bar: #111;
    --hamburger-border: transparent;
    position: relative;
    width: 56px;
    height: 44px;
    border: 1px solid var(--hamburger-border);
    background-color: var(--hamburger-bg);
    cursor: pointer;
    transform: scale(1.8);
    transition: background-color 0.3s ease, border-color 0.3s ease;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.c-hamburger__bar,
.c-hamburger__line,
.c-hamburger__slide-line {
    position: absolute;
    width: 40px;
    height: 3px;
    border-radius: 5px;
    background-color: var(--hamburger-bar);
    transition: all 0.3s ease-in-out;
}

/* 3本バーの初期配置 */
.c-hamburger__bar {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, calc(-50% - 8px));
}

.c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, calc(-50% + 8px));
}

/* ステージ配色ごとのボタンテーマ */
.p-demo--simple .c-hamburger {
    --hamburger-bg: #111;
    --hamburger-bar: #ffffff;
}

.p-demo--rotation .c-hamburger {
    --hamburger-bg: transparent;
    --hamburger-bar: #ffffff;
    --hamburger-border: #ffffff;
}

.p-demo--pivot .c-hamburger {
    --hamburger-bg: #e0e0e0;
    --hamburger-bar: #111;
}

.p-demo--morph .c-hamburger {
    --hamburger-bg: #b0413e;
    --hamburger-bar: #ffffff;
}

.p-demo--burst .c-hamburger {
    --hamburger-bg: transparent;
    --hamburger-bar: #ffffff;
    --hamburger-border: #ffffff;
}

.p-demo--flip .c-hamburger {
    --hamburger-bg: #6f4e37;
    --hamburger-bar: #ffffff;
}

.p-demo--slide .c-hamburger {
    --hamburger-bg: #ffffff;
    --hamburger-bar: #111;
}

.p-demo--twist .c-hamburger {
    --hamburger-bg: #e0e0e0;
    --hamburger-bar: #111;
}

/* 01: Simple X */
.c-hamburger--simple.is-action .c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.c-hamburger--simple.is-action .c-hamburger__bar:nth-of-type(2) {
    opacity: 0;
}

.c-hamburger--simple.is-action .c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* 02: Full Spin */
.c-hamburger--rotation.is-action .c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(315deg);
}

.c-hamburger--rotation.is-action .c-hamburger__bar:nth-of-type(2) {
    opacity: 0;
}

.c-hamburger--rotation.is-action .c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, -50%) rotate(-315deg);
}

/* 03: Pivot Left */
.c-hamburger--pivot.is-action .c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(135deg);
}

.c-hamburger--pivot.is-action .c-hamburger__bar:nth-of-type(2) {
    width: 0;
}

.c-hamburger--pivot.is-action .c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, -50%) rotate(45deg);
}

/* 04: Pivot Right */
.c-hamburger--morph.is-action .c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.c-hamburger--morph.is-action .c-hamburger__bar:nth-of-type(2) {
    opacity: 0;
}

.c-hamburger--morph.is-action .c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, -50%) rotate(135deg);
}

/* 05: Fly Away */
.c-hamburger--burst.is-action .c-hamburger__bar:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.c-hamburger--burst.is-action .c-hamburger__bar:nth-of-type(2) {
    opacity: 0;
    transform: translate(100%, -50%);
}

.c-hamburger--burst.is-action .c-hamburger__bar:nth-of-type(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* 06: Delayed Flip（2本バー） */
.c-hamburger__line {
    top: 50%;
    left: 50%;
}

.c-hamburger__line:nth-of-type(1) {
    transform: translate(-50%, calc(-50% - 6px));
}

.c-hamburger__line:nth-of-type(2) {
    transform: translate(-50%, calc(-50% + 6px));
}

.c-hamburger--flip.is-action .c-hamburger__line:nth-of-type(1) {
    transform: translate(-50%, -50%) rotate(-135deg);
    transition:
        top 0.22s cubic-bezier(0.33333, 0, 0.66667, 0.33333) 0.2s,
        transform 0.28s cubic-bezier(0.215, 0.61, 0.355, 1) 0.2s;
}

.c-hamburger--flip.is-action .c-hamburger__line:nth-of-type(2) {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* 07: Two Step（集まってから×） */
.c-hamburger__slide-line {
    left: 13%;
    border-radius: 6px;
    transition-property: transform, top;
    transition-duration: 0.3s;
}

.c-hamburger__slide-line:nth-of-type(1) {
    top: 30%;
    transition-delay: 0s, 0.3s;
}

.c-hamburger__slide-line:nth-of-type(2) {
    top: 65%;
    transition-delay: 0s, 0.3s;
}

.c-hamburger--slide.is-action .c-hamburger__slide-line:nth-of-type(1) {
    top: 50%;
    transform: translateY(-50%) rotate(-30deg);
    transition-delay: 0.3s, 0s;
}

.c-hamburger--slide.is-action .c-hamburger__slide-line:nth-of-type(2) {
    top: 50%;
    transform: translateY(-50%) rotate(30deg);
    transition-delay: 0.3s, 0s;
}

/* 08: Plus Twist（＋が出てから回転） */
.c-hamburger--twist .c-hamburger__bar {
    transition-delay: 0.6s;
}

.c-hamburger--twist .c-hamburger__bar:nth-of-type(2) {
    transition-delay: 0.5s;
}

.c-hamburger--twist.is-action .c-hamburger__bar:nth-of-type(1) {
    top: 0;
    opacity: 0;
    transition: top 0.5s ease, opacity 0.5s ease;
}

.c-hamburger--twist.is-action .c-hamburger__bar:nth-of-type(2) {
    opacity: 0;
    transition-delay: 0s;
}

.c-hamburger--twist.is-action .c-hamburger__bar:nth-of-type(3) {
    top: 100%;
    opacity: 0;
    transition: top 0.5s ease, opacity 0.5s ease;
}

.c-hamburger__v-bar {
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 5px;
    background-color: var(--hamburger-bar);
    transform: translate(-50%, -50%) rotate(0deg);
}

.c-hamburger__v-bar:nth-of-type(4) {
    width: 3px;
    height: 40px;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: 0.3s, 0.3s;
}

.c-hamburger--twist.is-action .c-hamburger__v-bar:nth-of-type(4) {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(45deg);
    transition-delay: 0s, 0.3s;
}

.c-hamburger__v-bar:nth-of-type(5) {
    width: 0%;
    max-width: 40px;
    height: 3px;
    transform-origin: center;
    transition: width 0.3s ease, transform 0.3s ease;
    transition-delay: 1s, 0.3s;
}

.c-hamburger--twist.is-action .c-hamburger__v-bar:nth-of-type(5) {
    width: 100%;
    max-width: 40px;
    transform: translate(-50%, -50%) rotate(45deg);
    transition-delay: 0s, 0.3s;
}

/* 09: Wipe Cross（まどか☆マギカ公式サイト風のワイプ）
   バー本体は描かず ::before の width を 0↔100% で伸縮させる。
   左右どちらに拭き取られるかは left / right の付け替えで制御 */
.p-demo--wipe .c-hamburger {
    --hamburger-bg: transparent;
    --hamburger-bar: #ff9097;
}

.c-hamburger__wipe {
    position: absolute;
    top: 50%;
    left: 50%;
    display: block;
    width: 40px;
    height: 12px;
    transform: translate(-50%, -50%);
}

.c-hamburger__wipe--open {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.c-hamburger__wipe-bar {
    position: relative;
    display: block;
    width: 100%;
    height: 2px;
}

.c-hamburger__wipe-bar:nth-child(1) {
    --delay: 0s;
}

.c-hamburger__wipe-bar:nth-child(2) {
    --delay: 0.05s;
}

.c-hamburger__wipe--close .c-hamburger__wipe-bar {
    position: absolute;
    top: 50%;
    left: 50%;
}

.c-hamburger__wipe--close .c-hamburger__wipe-bar:nth-child(1) {
    transform: translate(-50%, -50%) rotate(25deg);
}

.c-hamburger__wipe--close .c-hamburger__wipe-bar:nth-child(2) {
    transform: translate(-50%, -50%) rotate(-25deg);
}

.c-hamburger__wipe-bar::before {
    position: absolute;
    top: 0;
    right: 0;
    display: block;
    height: 100%;
    background: var(--hamburger-bar);
    content: "";
    transition: width 0.4s cubic-bezier(0.65, 0, 0.35, 1);
}

/* 閉じているとき：バー表示・×は幅0 */
.c-hamburger__wipe--open .c-hamburger__wipe-bar::before {
    width: 100%;
    left: 0;
    transition-delay: calc(var(--delay) + 0.2s);
}

.c-hamburger__wipe--close .c-hamburger__wipe-bar::before {
    width: 0;
    transition-delay: var(--delay);
}

/* 開いたとき：バーが右へ拭き取られ、×が左から描かれる */
.c-hamburger--wipe.is-action .c-hamburger__wipe--open .c-hamburger__wipe-bar::before {
    width: 0;
    left: auto;
    right: 0;
    transition-delay: var(--delay);
}

.c-hamburger--wipe.is-action .c-hamburger__wipe--close .c-hamburger__wipe-bar::before {
    width: 100%;
    left: 0;
    transition-delay: calc(var(--delay) + 0.2s);
}

.l-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 32px 5vw;
    color: var(--color-paper);
    background: var(--color-ink);
    font-size: 0.6875rem;
    letter-spacing: 0.12em;
}

.l-footer p {
    margin: 0;
}

.l-footer__link {
    padding-block: 4px;
    border-bottom: 1px solid currentColor;
}

@media (prefers-reduced-motion: reduce) {
    .c-hamburger,
    .c-hamburger__bar,
    .c-hamburger__line,
    .c-hamburger__slide-line,
    .c-hamburger__v-bar,
    .c-hamburger__wipe-bar::before {
        transition: none;
    }
}