@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700;900&display=swap');

/* AI-Chain Tools - Full Template Design System (Tech Edition) */

:root,
[data-theme="light"] {
    --primary-color: #0f9dff;
    --secondary-color: #2262f3;
    --accent-color: #ff8a24;
    --success-color: #1dbf73;
    --danger-color: #e5484d;
    --warning-color: #ffb020;

    --background-color: #f2f7ff;
    --bg-color: var(--background-color);
    --text-color: #0f1f36;
    --muted-text-color: #4d5d78;
    --light-gray: #e9f1ff;
    --border-color: rgba(17, 53, 112, 0.15);
    --card-bg: rgba(255, 255, 255, 0.86);
    --card-elevated-bg: rgba(255, 255, 255, 0.94);

    --header-bg: rgba(255, 255, 255, 0.8);
    --footer-bg: #07142a;
    --footer-text: #d4deef;

    --shadow-color: rgba(13, 39, 81, 0.16);
    --glow-color: rgba(15, 157, 255, 0.3);

    --font-family: 'Space Grotesk', 'Noto Sans TC', 'Segoe UI', system-ui, sans-serif;
    --mono-family: 'SF Mono', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;

    --border-radius: 18px;
    --transition: 180ms ease;
    --container-max-width: 1240px;
}

[data-theme="dark"] {
    --primary-color: #3ab7ff;
    --secondary-color: #4f78ff;
    --accent-color: #ff9f40;
    --success-color: #23d18b;
    --danger-color: #ff6a6f;
    --warning-color: #ffc150;

    --background-color: #040b16;
    --bg-color: var(--background-color);
    --text-color: #eaf2ff;
    --muted-text-color: #9ab0d3;
    --light-gray: #10233f;
    --border-color: rgba(124, 173, 255, 0.18);
    --card-bg: rgba(10, 23, 43, 0.72);
    --card-elevated-bg: rgba(11, 26, 49, 0.84);

    --header-bg: rgba(5, 17, 34, 0.86);
    --footer-bg: #020812;
    --footer-text: #b2c4e4;

    --shadow-color: rgba(0, 0, 0, 0.45);
    --glow-color: rgba(58, 183, 255, 0.25);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    font-family: var(--font-family);
    color: var(--text-color);
    background:
        radial-gradient(circle at 12% 16%, rgba(15, 157, 255, 0.08), transparent 32%),
        radial-gradient(circle at 86% 14%, rgba(34, 98, 243, 0.08), transparent 34%),
        var(--bg-color);
    line-height: 1.65;
    font-size: 16px;
    transition: background-color var(--transition), color var(--transition);
}

.tools-template-shell {
    position: relative;
    isolation: isolate;
    min-height: 100vh;
}

.tools-shell-inner {
    position: relative;
    z-index: 2;
}

.tools-background {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.tools-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(46, 110, 219, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(46, 110, 219, 0.08) 1px, transparent 1px);
    background-size: 36px 36px;
    opacity: 0.45;
    mask-image: radial-gradient(circle at center, rgba(0, 0, 0, 0.85), transparent 85%);
}

.tools-orb {
    position: absolute;
    width: 42vw;
    aspect-ratio: 1;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.34;
}

.tools-orb-a {
    top: -12vw;
    left: -6vw;
    background: rgba(15, 157, 255, 0.42);
}

.tools-orb-b {
    top: 12vh;
    right: -14vw;
    background: rgba(34, 98, 243, 0.28);
}

.tools-orb-c {
    bottom: -18vw;
    left: 32vw;
    background: rgba(255, 138, 36, 0.22);
}

.tools-content-frame {
    position: relative;
    z-index: 3;
    padding-bottom: 2rem;
}

.tools-page-main {
    position: relative;
    z-index: 1;
}

.container {
    width: min(var(--container-max-width), 100%);
    margin: 0 auto;
    padding: 0 24px;
}

.header {
    position: sticky;
    top: 14px;
    z-index: 1200;
    margin: 12px auto 18px;
    width: min(calc(var(--container-max-width) + 48px), calc(100vw - 20px));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--header-bg);
    backdrop-filter: blur(16px);
    box-shadow: 0 12px 34px var(--shadow-color);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: 100%;
    padding: 0.9rem 1.25rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    color: var(--text-color);
    min-width: 0;
}

.logo-badge {
    display: inline-flex;
    width: 2.2rem;
    height: 2.2rem;
    border-radius: 10px;
    background: linear-gradient(140deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.4) inset;
}

.logo-badge svg {
    width: 1.3rem;
    height: 1.3rem;
    margin: auto;
    fill: currentColor;
}

.logo-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.logo-text strong {
    font-size: 1rem;
    line-height: 1.2;
    letter-spacing: 0.01em;
}

.logo-text small {
    font-size: 0.72rem;
    color: var(--muted-text-color);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    list-style: none;
    gap: 0.45rem;
    flex: 1;
    margin: 0;
    padding: 0;
}

.nav-links a,
.dropdown-toggle {
    border: 0;
    background: transparent;
    color: var(--text-color);
    text-decoration: none;
    font: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    padding: 0.56rem 0.72rem;
    border-radius: 12px;
    transition: background-color var(--transition), color var(--transition), box-shadow var(--transition);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    white-space: nowrap;
}

.nav-links a:hover,
.dropdown-toggle:hover,
.nav-links a.is-active-link,
.nav-links a[aria-current="page"] {
    color: var(--primary-color);
    background: rgba(15, 157, 255, 0.12);
    box-shadow: 0 0 0 1px rgba(15, 157, 255, 0.2) inset;
}

.dropdown {
    position: relative;
}

.icon {
    display: inline-flex;
    width: 1rem;
    height: 1rem;
}

.icon svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
}

.icon-chevron {
    width: 0.92rem;
    height: 0.92rem;
    transition: transform var(--transition);
}

.dropdown.active .icon-chevron {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    padding: 0.4rem;
    list-style: none;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    background: var(--card-elevated-bg);
    backdrop-filter: blur(12px);
    box-shadow: 0 16px 34px var(--shadow-color);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    width: 100%;
    border-radius: 10px;
    padding: 0.62rem 0.75rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-chip {
    text-decoration: none;
    color: #fff;
    background: linear-gradient(140deg, var(--secondary-color), var(--primary-color));
    border-radius: 999px;
    padding: 0.42rem 0.72rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    box-shadow: 0 8px 18px rgba(15, 157, 255, 0.22);
    transition: filter var(--transition), transform var(--transition);
}

.status-chip:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
}

.theme-toggle,
.mobile-menu-toggle {
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-color);
    background: var(--card-bg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition);
    cursor: pointer;
}

.theme-toggle:hover,
.mobile-menu-toggle:hover,
.mobile-menu-toggle.active {
    background: rgba(15, 157, 255, 0.14);
    border-color: rgba(15, 157, 255, 0.3);
    color: var(--primary-color);
}

.theme-icon,
.menu-icon {
    width: 1.16rem;
    height: 1.16rem;
    display: inline-flex;
}

.theme-icon svg,
.menu-icon svg {
    width: 100%;
    height: 100%;
    fill: currentColor;
}

.mobile-menu-toggle {
    display: none;
}

.tools-breadcrumb {
    width: min(var(--container-max-width), 100%);
    margin: 1.1rem auto 0;
    padding: 0 24px;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    color: var(--muted-text-color);
    font-size: 0.82rem;
}

.tools-breadcrumb a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.tools-breadcrumb a:hover {
    text-decoration: underline;
}

.tools-breadcrumb strong {
    font-weight: 700;
    color: var(--text-color);
}

.hero {
    text-align: center;
    padding: clamp(2.6rem, 6vw, 4.2rem) 1.2rem;
    margin: 0 auto 2.6rem;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    background:
        linear-gradient(150deg, rgba(15, 157, 255, 0.12), rgba(34, 98, 243, 0.05) 35%, rgba(255, 138, 36, 0.09)),
        var(--card-bg);
    backdrop-filter: blur(8px);
    box-shadow: 0 14px 36px var(--shadow-color);
}

.hero h1 {
    font-size: clamp(2rem, 5.2vw, 3.4rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin-bottom: 0.9rem;
    color: var(--text-color);
}

.hero p {
    max-width: 760px;
    margin: 0 auto;
    color: var(--muted-text-color);
    font-size: clamp(1rem, 2vw, 1.2rem);
}

.tool-container,
.feature-card,
.tutorial,
.faq,
.content-links,
.tool-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--card-bg);
    box-shadow: 0 10px 24px var(--shadow-color);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.tool-container,
.tutorial,
.faq,
.content-links {
    padding: clamp(1.2rem, 2.8vw, 2rem);
    margin-bottom: 2rem;
}

.feature-card,
.tool-card {
    padding: 1.45rem;
}

.tool-card,
.feature-card,
.category-btn,
.dropdown-toggle,
.nav-links a,
.btn {
    cursor: pointer;
}

.tool-card:hover,
.feature-card:hover,
.tool-container:hover,
.tutorial:hover,
.faq:hover,
.content-links:hover {
    border-color: rgba(15, 157, 255, 0.35);
    box-shadow: 0 14px 34px var(--shadow-color), 0 0 0 1px rgba(15, 157, 255, 0.12) inset;
    transform: translateY(-2px);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.2rem;
    margin-bottom: 2rem;
}

.feature-card h3,
.tool-card h3,
.content-links h3 {
    color: var(--text-color);
    margin-bottom: 0.7rem;
}

.tool-card p,
.feature-card p,
.tutorial p,
.faq p,
.content-links p {
    color: var(--muted-text-color);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.2rem;
    margin-bottom: 2.6rem;
}

.tool-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    margin-bottom: 1.4rem;
}

.tool-column {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.tool-column label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--muted-text-color);
}

.tool-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.72rem;
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.42rem;
    min-height: 44px;
    min-width: 44px;
    border: 1px solid transparent;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    padding: 0.68rem 1.05rem;
    transition: filter var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn:hover {
    filter: brightness(1.05);
    box-shadow: 0 12px 26px rgba(15, 157, 255, 0.28);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    color: var(--text-color);
    background: var(--light-gray);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background: color-mix(in srgb, var(--light-gray) 78%, var(--primary-color) 22%);
    color: var(--text-color);
    box-shadow: none;
}

.btn-success {
    background: var(--success-color) !important;
    border-color: transparent !important;
    color: #ffffff !important;
}

.form-control,
input,
select,
textarea {
    width: 100%;
    min-height: 44px;
    padding: 0.7rem 0.82rem;
    font-family: var(--font-family);
    font-size: 0.95rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: var(--card-elevated-bg);
    color: var(--text-color);
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

textarea {
    min-height: 180px;
    resize: vertical;
}

.form-control:focus,
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(15, 157, 255, 0.65);
    box-shadow: 0 0 0 3px rgba(15, 157, 255, 0.2);
}

::placeholder {
    color: color-mix(in srgb, var(--muted-text-color) 88%, transparent);
}

code,
pre,
.code-block {
    font-family: var(--mono-family);
}

.code-block {
    background: color-mix(in srgb, var(--light-gray) 72%, transparent);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.9rem;
    font-size: 0.9rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.content-links {
    text-align: center;
}

.content-links a,
.tool-info a,
.faq a,
.tutorial a {
    color: var(--secondary-color);
    font-weight: 600;
    text-decoration: none;
}

.content-links a:hover,
.tool-info a:hover,
.faq a:hover,
.tutorial a:hover {
    text-decoration: underline;
}

.tutorial h2,
.faq h2 {
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    margin-bottom: 1rem;
    color: var(--text-color);
}

.tutorial ol,
.tutorial ul {
    padding-left: 1.2rem;
}

.tutorial li {
    margin-bottom: 0.45rem;
}

.faq-item {
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px dashed var(--border-color);
}

.faq-item:last-child {
    border-bottom: 0;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-item h3 {
    margin-bottom: 0.45rem;
}

.tool-info {
    text-align: center;
    color: var(--muted-text-color);
    padding: 1.2rem 0;
}

.success {
    color: var(--success-color);
    font-weight: 700;
}

.error {
    color: var(--danger-color);
    font-weight: 700;
}

.info {
    color: var(--secondary-color);
    font-weight: 700;
}

.reveal-item {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 420ms ease, transform 420ms ease;
    transition-delay: var(--reveal-delay, 0ms);
}

.reveal-item.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.footer {
    margin-top: 2rem;
    background: linear-gradient(150deg, rgba(9, 34, 66, 0.94), rgba(3, 14, 30, 0.98));
    color: var(--footer-text);
    border-top: 1px solid rgba(96, 146, 255, 0.22);
}

.footer-container {
    width: min(var(--container-max-width), 100%);
    margin: 0 auto;
    padding: 2.4rem 24px 1rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
    margin-bottom: 1.3rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 0.68rem;
    color: #ffffff;
}

.footer-section h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: color-mix(in srgb, var(--primary-color) 78%, white 22%);
}

.footer-section p {
    color: color-mix(in srgb, var(--footer-text) 84%, transparent);
}

.footer-section ul {
    list-style: none;
    display: grid;
    gap: 0.44rem;
}

.footer-section a {
    color: var(--footer-text);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-section a:hover,
.footer-section a.is-active-link {
    color: #ffffff;
}

.footer-cta {
    display: inline-flex;
    margin-top: 0.92rem;
    padding: 0.58rem 0.82rem;
    border-radius: 12px;
    font-weight: 700;
    color: #ffffff;
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent-color) 85%, white 15%), color-mix(in srgb, var(--primary-color) 80%, white 20%));
}

.footer-bottom {
    border-top: 1px solid rgba(130, 167, 241, 0.28);
    padding-top: 0.95rem;
}

.footer-bottom p {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    color: color-mix(in srgb, var(--footer-text) 78%, transparent);
    font-size: 0.88rem;
}

.footer-bottom a {
    color: #eaf2ff;
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

.message-toast-stack {
    position: fixed;
    right: 18px;
    top: 18px;
    z-index: 2000;
    display: grid;
    gap: 0.55rem;
    max-width: min(88vw, 340px);
}

.message-toast {
    border-radius: 11px;
    border: 1px solid transparent;
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.24);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.72rem 0.9rem;
    transform: translateX(18px);
    opacity: 0;
    transition: transform 220ms ease, opacity 220ms ease;
}

.message-toast.visible {
    transform: translateX(0);
    opacity: 1;
}

.message-toast.success {
    background: color-mix(in srgb, var(--success-color) 86%, black 14%);
    color: #ffffff;
}

.message-toast.error {
    background: color-mix(in srgb, var(--danger-color) 86%, black 14%);
    color: #ffffff;
}

.message-toast.warning {
    background: color-mix(in srgb, var(--warning-color) 90%, black 10%);
    color: #2e1f00;
}

.message-toast.info {
    background: color-mix(in srgb, var(--primary-color) 86%, black 14%);
    color: #ffffff;
}

/* Ad system reserved */
.ad-container {
    display: none;
}

.ads-enabled .ad-container {
    display: block;
}

/* Dark mode hard overrides for page-level inline styles */
[data-theme="dark"] .tool-card,
[data-theme="dark"] .feature-card,
[data-theme="dark"] .tool-container,
[data-theme="dark"] .tutorial,
[data-theme="dark"] .faq,
[data-theme="dark"] .content-links {
    background: var(--card-bg) !important;
    border-color: var(--border-color) !important;
    color: var(--text-color) !important;
}

[data-theme="dark"] .tool-card p,
[data-theme="dark"] .feature-card p,
[data-theme="dark"] .content-links p,
[data-theme="dark"] .tutorial p,
[data-theme="dark"] .faq p,
[data-theme="dark"] .tool-info {
    color: var(--muted-text-color) !important;
}

[data-theme="dark"] .category-btn {
    background: var(--card-elevated-bg) !important;
    border-color: var(--border-color) !important;
    color: var(--muted-text-color) !important;
}

[data-theme="dark"] .category-btn:hover,
[data-theme="dark"] .category-btn.active {
    background: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: #ffffff !important;
}

[data-theme="dark"] .search-input {
    background: var(--card-elevated-bg) !important;
    color: var(--text-color) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .search-icon,
[data-theme="dark"] .tools-stats,
[data-theme="dark"] .no-results {
    color: var(--muted-text-color) !important;
}

@media (max-width: 1080px) {
    .nav-links {
        gap: 0.28rem;
    }

    .status-chip {
        display: none;
    }

    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 860px) {
    .header {
        top: 8px;
        margin: 8px auto 14px;
        border-radius: 16px;
    }

    .nav-container {
        padding: 0.75rem 0.85rem;
    }

    .mobile-menu-toggle {
        display: inline-flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        left: 10px;
        right: 10px;
        top: calc(100% + 8px);
        border: 1px solid var(--border-color);
        background: var(--card-elevated-bg);
        border-radius: 14px;
        padding: 0.75rem;
        flex-direction: column;
        align-items: stretch;
        gap: 0.35rem;
        box-shadow: 0 14px 24px var(--shadow-color);
        backdrop-filter: blur(10px);
    }

    .nav-links.mobile-active {
        display: flex;
    }

    .nav-links > li,
    .nav-links a,
    .dropdown-toggle {
        width: 100%;
    }

    .dropdown {
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        background: transparent;
        border: 0;
        box-shadow: none;
        display: none;
        padding: 0.25rem 0 0.1rem;
    }

    .dropdown.active .dropdown-menu {
        display: grid;
    }

    .dropdown-menu a {
        padding-left: 1.2rem;
    }

    .tools-breadcrumb,
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .hero {
        border-radius: 18px;
    }
}

@media (max-width: 640px) {
    .tool-row {
        grid-template-columns: 1fr;
    }

    .tool-actions {
        flex-direction: column;
    }

    .tool-actions .btn {
        width: 100%;
    }

    .features,
    .tool-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-container {
        padding-top: 2rem;
    }

    .message-toast-stack {
        left: 12px;
        right: 12px;
        max-width: none;
    }

    .message-toast {
        width: 100%;
    }
}