:root {
    --background-start: #2a2a2e;
    --background-end: #101012;
    --background-mid: #18181a;

    --card-bg-rgb: 70, 70, 70;
    --card-bg-alpha: 0.45;
    --card-blur: 10px;
    --ui-blur: 8px;
    --card-border-color: rgba(255, 255, 255, 0.15);
    --ui-border-color: rgba(255, 255, 255, 0.1);
    --unified-shadow: 0 3px 5px rgba(0, 0, 0, 0.12), 0 8px 20px rgba(0, 0, 0, 0.18);

    --neutral-light-rgb: 255, 255, 255;
    --module-bg-rgb: 51, 51, 51;
    --mobile-menu-bg: #202020;
    --mobile-menu-bg-alpha: 0.7;
    --module-bg-error-rgb: 92, 58, 58;
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-error: #ffcccc;
    --text-placeholder: #808080;
    --footer-text: #888888;
    --separator-color: rgba(255, 255, 255, 0.15);
    --icon-color: #cccccc;
    --icon-hover-color: #ffffff;
    --accent-color: #60a5fa;
    --accent-color-rgb: 96, 165, 250;
    --header-glow: rgba(255, 255, 255, 0.7);
    --border-radius: 22.5px;
    --border-radius-card: 15px;
    --module-width: 540px;
    --header-height-desktop: 75px;
    --header-height-mobile: 60px;
    --transition-header: 0.4s ease-out;
    --menu-transition-duration: 0.35s;

    --hl-command-color: #93c5fd;
    --hl-argument-color: #86efac;
    --hl-punctuation-color: #a1a1aa;
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
    height: 100%;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(160deg, var(--background-start) 0%, var(--background-mid) 50%, var(--background-end) 100%) fixed;
    background-size: 200% 200%;
    animation: gradient-shift 20s ease infinite;
    color: var(--text-primary);
    min-height: 100%;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.mobile-menu-open { overflow: hidden; }

a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 3px;
    border-radius: 4px;
}
.input-wrapper input:focus { outline: none; }
.input-wrapper button:focus { outline: none; }
.input-wrapper:focus-within {
    box-shadow: 0 0 0 3px rgba(var(--neutral-light-rgb), 0.3), var(--unified-shadow);
    background-color: rgba(var(--module-bg-rgb), 0.85);
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 120px;
    width: 100%;
    box-sizing: border-box;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    background-color: rgba(26, 26, 26, 0.6);
    backdrop-filter: blur(var(--ui-blur));
    -webkit-backdrop-filter: blur(var(--ui-blur));
    border-bottom: 1px solid var(--ui-border-color);
    height: var(--header-height-desktop);
    transition: transform var(--transition-header), opacity var(--transition-header);
    will-change: transform, opacity;
}
.site-header.header-hidden {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background-color: rgba(var(--module-bg-rgb), 0.7);
    backdrop-filter: blur(var(--ui-blur));
    -webkit-backdrop-filter: blur(var(--ui-blur));
    border: 1px solid var(--ui-border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--unified-shadow);
    padding: 17px 34px;
    margin: 0 auto;
    width: 100%;
    max-width: var(--module-width);
    box-sizing: border-box;
    transition: box-shadow 0.3s ease-out, background-color 0.3s ease;
}

#result-module {
    display: grid;
    grid-template-areas: "content";
    background-color: rgba(var(--module-bg-rgb), 0.7);
    backdrop-filter: blur(var(--ui-blur));
    -webkit-backdrop-filter: blur(var(--ui-blur));
    border: 1px solid var(--ui-border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--unified-shadow);
    padding: 18px 25px;
    margin: 30px auto 0 auto;
    width: 100%;
    max-width: var(--module-width);
    box-sizing: border-box;
    align-items: center;
    text-align: left;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out, background-color 0.3s ease;
    pointer-events: none;
    min-height: 68px;
    overflow: hidden;
}
#result-module.error {
    background-color: rgba(var(--module-bg-error-rgb), 0.85);
    backdrop-filter: blur(var(--ui-blur));
    -webkit-backdrop-filter: blur(var(--ui-blur));
    border: 1px solid var(--ui-border-color);
    box-shadow: var(--unified-shadow);
}


.logo-placeholder {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    text-decoration: none;
}
.logo-placeholder img {
    display: block;
    height: 35px;
    width: auto;
}
.header-nav {
    display: flex;
    align-items: center;
}
.header-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 30px;
    font-size: 0.95rem;
    transition: color 0.2s ease-out, text-shadow 0.3s ease-out, transform 0.2s ease-out;
    position: relative;
    padding: 5px 0;
}
.header-nav a:hover {
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--header-glow);
    transform: translateY(-2px);
}
.header-nav a::after { display: none; }
#mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 5px;
    cursor: pointer;
    z-index: 101;
    border-radius: 50%;
}
#mobile-menu-toggle img {
    display: block;
    width: 28px;
    height: 28px;
}

.mobile-menu {
    position: fixed;
    top: var(--header-height-mobile);
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    background-color: rgba(var(--card-bg-rgb), var(--card-bg-alpha));
    backdrop-filter: blur(var(--card-blur));
    -webkit-backdrop-filter: blur(var(--card-blur));
    border-bottom: 1px solid var(--ui-border-color);
    padding: 15px 0;
    box-sizing: border-box;
    transform: translateY(-110%);
    visibility: hidden;
    transition: transform var(--menu-transition-duration) ease-in-out, visibility 0s linear var(--menu-transition-duration);
    z-index: 99;
    display: flex;
    flex-direction: column;
}
.mobile-menu nav {
    text-align: center;
}

.mobile-menu nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    display: block;
    padding: 12px 20px;
    transition: color 0.2s ease, text-shadow 0.3s ease;
    border-bottom: 1px solid var(--separator-color);
}
.mobile-menu nav a:hover {
    color: var(--text-primary);
    text-shadow: 0 0 8px var(--header-glow);
}
.mobile-menu nav a:last-child {
    border-bottom: none;
}

body.mobile-menu-open .mobile-menu {
    transform: translateY(0);
    visibility: visible;
    transition: transform var(--menu-transition-duration) ease-in-out, visibility 0s linear 0s;
}

main.content-area,
#instructions-section {
     scroll-snap-align: start;
     scroll-snap-stop: always;
     min-height: 100vh;
     width: 100%;
     position: relative;
     z-index: 1;
     display: flex;
     flex-direction: column;
     align-items: center;
     box-sizing: border-box;
}
main.content-area {
    justify-content: center;
    padding-top: var(--header-height-desktop);
    padding-bottom: 50px;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, padding-top var(--menu-transition-duration) ease-in-out;
}
#instructions-section {
    padding: 60px 20px 0 20px;
    justify-content: flex-start;
    opacity: 0;
    transition: opacity 0.6s 0.1s ease-out;
}

.container {
    width: 90%;
    max-width: calc(var(--module-width) + 100px);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transition-delay: 0.1s;
}
.container.is-visible {
    opacity: 1;
    transform: translateY(0);
}
h1 {
    color: var(--text-primary);
    font-size: 3.4rem;
    font-weight: 700;
    line-height: 1.3;
    margin-top: 0;
    margin-bottom: 42px;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: -15px;
    margin-bottom: 35px;
    max-width: 550px;
    line-height: 1.5;
    font-weight: 400;
    font-family: 'JetBrains Mono', Consolas, Monaco, Courier, monospace;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-wrapper input {
    flex-grow: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    padding: 5px 0;
    font-family: inherit;
    font-weight: 400;
    min-width: 0;
}
.input-wrapper input::placeholder {
    color: var(--text-placeholder);
    opacity: 1;
}
.input-wrapper .arrow {
    background: none;
    border: none;
    margin-left: 18px;
    line-height: 1;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: transform 0.15s ease-out, background-color 0.2s ease;
}
.input-wrapper .arrow img {
    display: block;
    width: 24px;
    height: 24px;
    transition: transform 0.2s ease-out;
}
.input-wrapper .arrow:hover {
    background-color: rgba(255, 255, 255, 0.1);
}
.input-wrapper .arrow:hover img {
    transform: translateX(4px);
}
.input-wrapper .arrow:active {
    transform: scale(0.90);
}


#result-module > div {
    grid-area: content;
    transition: opacity 0.3s ease-in-out;
}
#command-view {
    display: flex;
    align-items: center;
    justify-content: space-between;
    opacity: 0;
    pointer-events: none;
}
#error-view {
    opacity: 0;
    pointer-events: none;
    color: var(--text-error);
    font-family: "Inter", sans-serif;
    font-size: 0.95rem;
    text-align: center;
    padding: 5px 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
#error-view img {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    opacity: 0.8;
    flex-shrink: 0;
}
#error-view span { text-align: center; }
#result-module.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

#result-module:not(.error) #command-view {
    opacity: 1;
    pointer-events: auto;
}
#result-module.error #error-view {
    opacity: 1;
    pointer-events: auto;
}
#result-module.error #copy-button { display: none; }

@keyframes shake-horizontal {
    0%, 100% { transform: translate(0, 0); }
    10%, 30%, 50%, 70%, 90% { transform: translate(-4px, 0); }
    20%, 40%, 60%, 80% { transform: translate(4px, 0); }
}
.shake-now {
    animation: shake-horizontal 0.6s cubic-bezier(.36,.07,.19,.97) both;
}

#command-text {
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', Consolas, Monaco, Courier, monospace;
    font-size: 1rem;
    white-space: nowrap;
    overflow-x: auto;
    margin-right: 15px;
    scrollbar-width: thin;
    scrollbar-color: #666 rgba(var(--module-bg-rgb), 0.8);
    flex-grow: 1;
    min-width: 0;
    text-align: left;
    line-height: 1.5;
}
#command-text::-webkit-scrollbar { height: 6px; }
#command-text::-webkit-scrollbar-track { background: rgba(var(--module-bg-rgb), 0.5); border-radius: 3px; }
#command-text::-webkit-scrollbar-thumb { background-color: #666; border-radius: 3px; }

#command-text .hl-keyword { color: var(--hl-command-color); }
#command-text .hl-cmd { color: var(--hl-punctuation-color); }
#command-text .hl-func { color: var(--hl-argument-color); }

#copy-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    line-height: 1;
    transition: transform 0.15s ease-out, background-color 0.2s ease;
    position: relative;
    margin-left: 5px;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}
#copy-button .original-icon img {
    display: block;
    width: 20px;
    height: 20px;
}
#copy-button .original-icon { transition: opacity 0.1s ease-out; }
#copy-button:hover { background-color: rgba(255, 255, 255, 0.1); }
#copy-button:hover .original-icon img { transform: scale(1.1); }
#copy-button:active { transform: scale(0.90); }
#copy-button .feedback {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.7);
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    pointer-events: none;
}
#copy-button .feedback img {
    display: block;
    width: 20px;
    height: 20px;
}
#copy-button.copied .original-icon { opacity: 0; }
#copy-button.copied .feedback {
    opacity: 1;
    transform: scale(1);
}

.scroll-prompt-container {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    pointer-events: none;
}
#scroll-prompt-container-down { bottom: 30px; }
#scroll-prompt-container-up { top: calc(var(--header-height-desktop) + 20px); }
.scroll-prompt {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.4s ease-out, visibility 0s 0.4s linear, transform 0.4s ease-out;
    pointer-events: none;
}
#scroll-prompt-up { transform: translateY(-10px); }
.scroll-prompt.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    transition: opacity 0.4s ease-out, visibility 0s 0s linear, transform 0.4s ease-out;
}
.scroll-prompt img {
    width: 24px;
    height: 24px;
    display: block;
    animation: bounce-down 2s infinite ease-in-out;
}
#scroll-prompt-up img { animation-name: bounce-up; }
@keyframes bounce-down {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(8px); }
    60% { transform: translateY(4px); }
}
@keyframes bounce-up {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-8px); }
    60% { transform: translateY(-4px); }
}

#instructions-section {
    padding-top: var(--header-height-desktop);
}
#instructions-section.is-visible { opacity: 1; }
.instructions-content-wrapper {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 40px 0;
    box-sizing: border-box;
}

.instructions-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    grid-auto-rows: 1fr;
    gap: 30px;
    width: 100%;
    max-width: 1000px;
    padding: 20px 0;
}

.instruction-step {
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
    opacity: 0;

    background: rgba(var(--card-bg-rgb), var(--card-bg-alpha));
    backdrop-filter: blur(var(--card-blur));
    -webkit-backdrop-filter: blur(var(--card-blur));
    border-radius: var(--border-radius-card);
    border: 1px solid var(--ui-border-color);
    box-shadow: var(--unified-shadow);

    padding: 25px;
    color: var(--text-secondary);
    overflow: hidden;
    transition: opacity 0.5s ease-out;
}

.instruction-step::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    bottom: 0;
    border-radius: var(--border-radius-card);
    z-index: -1;

    background: linear-gradient(
        90deg,
        transparent 20%,
        rgba(var(--neutral-light-rgb), 0.1) 45%,
        rgba(var(--neutral-light-rgb), 0.15) 50%,
        rgba(var(--neutral-light-rgb), 0.1) 55%,
        transparent 80%
    );
    background-size: 250% 100%;
    background-position: 175% 50%;
    opacity: 0;

    transition: opacity 0.15s ease-out, background-position 1.2s ease-in-out;
}

.instruction-step:hover::before {
    opacity: 1;
    background-position: -75% 50%;
}

#instructions-section.is-visible .instruction-step {
    opacity: 1;
}
#instructions-section.is-visible .instruction-step:nth-child(1) { transition-delay: 0.2s; }
#instructions-section.is-visible .instruction-step:nth-child(2) { transition-delay: 0.35s; }
#instructions-section.is-visible .instruction-step:nth-child(3) { transition-delay: 0.5s; }


.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}
.step-icon {
    width: 24px;
    height: 24px;
    margin: 0;
    margin-right: 10px;
    opacity: 0.85;
    flex-shrink: 0;
}
.instruction-step h3 {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin: 0;
    font-weight: 700;
}
.instruction-step p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
    flex-grow: 1;
    color: var(--text-secondary);
}

.site-footer {
    text-align: center;
    padding: 30px 20px;
    width: 100%;
    box-sizing: border-box;
    font-size: 0.85rem;
    color: var(--footer-text);
    margin-top: auto;
    flex-shrink: 0;
}

@media (max-width: 900px) {
     .site-header { padding: 20px 60px; }
     .instructions-container {
         gap: 20px;
         grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
     }
     .instruction-step { padding: 20px; }
 }

@media (max-width: 800px) {
     .site-header { padding: 15px 30px; height: var(--header-height-mobile); }
     .header-nav { display: none; }
     #mobile-menu-toggle { display: block; }
     main.content-area { padding-top: var(--header-height-mobile); }
     #instructions-section { padding-top: calc(var(--header-height-mobile) + 40px); }
     #scroll-prompt-container-up { top: calc(var(--header-height-mobile) + 15px); }
 }

@media (max-width: 768px) {
     :root {
         --module-width: 90%;
         --card-blur: 8px;
     }

    .subtitle {
        font-size: 0.85rem;
        margin-top: -10px;
        margin-bottom: 30px;
    }

     main.content-area, #instructions-section {
        scroll-snap-align: none;
        min-height: auto;
        padding-bottom: 40px;
     }
     main.content-area {
        min-height: 90vh;
        justify-content: center;
     }
     #instructions-section {
        padding-top: 60px;
        padding-bottom: 0;
        justify-content: flex-start;
     }
     .logo-placeholder img { height: 30px; }
     h1 { font-size: 2.6rem; margin-bottom: 36px; }
     .input-wrapper { padding: 14px 26px; }
     #result-module { padding: 15px 20px; margin-top: 25px; margin-bottom: 0; min-height: 64px; }
     #command-text { font-size: 0.9rem; }
     #result-module.error #error-view { font-size: 0.9rem; padding: 5px; }
     #copy-button img { width: 18px; height: 18px; }
     #copy-button .feedback img { width: 18px; height: 18px; }

     .instructions-content-wrapper { padding: 40px 0; flex-grow: 0; align-items: stretch; }
     .instructions-container {
         grid-template-columns: minmax(0, 1fr);
         gap: 25px;
         margin-bottom: 0;
     }
     .instruction-step {
        width: 100%;
        padding: 25px;
     }

     .site-footer {
        font-size: 0.8rem;
        padding: 50px 20px 30px 20px;
        margin-top: 0;
     }
 }

 @media (max-width: 480px) {
     :root {
         --card-blur: 6px;
     }
    .subtitle {
        font-size: 0.75rem;
        margin-top: -8px;
        margin-bottom: 25px;
    }
     .site-header { padding: 15px 20px; }
     main.content-area { padding-top: calc(var(--header-height-mobile) + 10px); }
     h1 { font-size: 2.0rem; margin-bottom: 30px; }
     .input-wrapper input { font-size: 1.0rem; }
     .input-wrapper .arrow img { width: 20px; height: 20px; }
     .input-wrapper { padding: 12px 20px; }
     #result-module { padding: 12px 18px; margin-top: 20px; min-height: 60px;}
     #command-text { font-size: 0.8rem; }
     #result-module.error #error-view { font-size: 0.8rem; }
     #copy-button img { width: 16px; height: 16px; }
     #copy-button .feedback img { width: 16px; height: 16px; }

     #instructions-section { padding-top: 50px; }
     .instruction-step {
        padding: 20px;
     }
     .step-icon {
        width: 24px;
        height: 24px;
        margin-right: 8px;
     }
     .site-footer { padding-top: 50px;}
  }