/* ============================================
   COMPONENTS – Navbar, hero, grid, converter,
   features, footer, ads
   ============================================ */

/* ==============================
   NAVBAR
   ============================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border-bottom: 1px solid var(--color-border);
    height: var(--navbar-height);
    transition: background var(--transition-base), border-color var(--transition-base);
}

.navbar__inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--space-4);
}

.navbar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
    letter-spacing: var(--letter-spacing-tight);
}

.navbar__logo:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.navbar__logo svg {
    width: 1.75rem;
    height: 1.75rem;
    flex-shrink: 0;
}

/* Nav links */
.navbar__links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.navbar__links a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
}

.navbar__links a:hover {
    color: var(--color-text);
    background: var(--color-primary-soft);
    text-decoration: none;
}

.navbar__links a[aria-current="page"] {
    color: var(--color-primary);
    background: var(--color-primary-soft);
    text-decoration: none;
}

/* Nav actions (dark mode toggle + ko-fi) */
.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* Dark mode toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.theme-toggle svg {
    width: 1.125rem;
    height: 1.125rem;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    display: none;
}

/* Default (light): show moon icon */
.theme-toggle .icon-moon {
    display: block;
}

.theme-toggle .icon-sun {
    display: none;
}

/* Dark mode: show sun icon */
@media (prefers-color-scheme: dark) {
    :root:not(.theme-light) .theme-toggle .icon-moon {
        display: none;
    }

    :root:not(.theme-light) .theme-toggle .icon-sun {
        display: block;
    }
}

.theme-dark .theme-toggle .icon-moon {
    display: none;
}

.theme-dark .theme-toggle .icon-sun {
    display: block;
}

.theme-light .theme-toggle .icon-moon {
    display: block;
}

.theme-light .theme-toggle .icon-sun {
    display: none;
}

/* Ko-fi button */
.kofi-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: var(--font-family);
    color: #fff;
    background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.kofi-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    color: #fff;
    text-decoration: none;
}

.kofi-btn svg {
    width: 1rem;
    height: 1rem;
}

/* Hamburger */
.navbar__toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    cursor: pointer;
    padding: var(--space-2);
    line-height: 0;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.navbar__toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.navbar__toggle svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Mobile nav */
@media (max-width: 768px) {
    .navbar__links {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--glass-bg);
        backdrop-filter: blur(var(--blur));
        -webkit-backdrop-filter: blur(var(--blur));
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-4);
        gap: var(--space-1);
        box-shadow: var(--shadow-lg);
    }

    .navbar__links.is-open {
        display: flex;
    }

    .navbar__links a {
        padding: var(--space-3) var(--space-4);
        border-radius: var(--radius);
        width: 100%;
    }

    .navbar__toggle {
        display: block;
    }

    .kofi-btn .kofi-label {
        display: none;
    }
}


/* ==============================
   HERO SECTION (Homepage)
   ============================== */
.hero {
    position: relative;
    padding: var(--space-20) var(--space-4) var(--space-16);
    text-align: center;
    overflow: hidden;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: 44rem;
    margin: 0 auto;
}

.hero__title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: var(--space-4);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 32rem;
    margin: 0 auto var(--space-8);
    line-height: var(--line-height);
}

/* Search bar in hero */
.hero__search {
    position: relative;
    max-width: 28rem;
    margin: 0 auto;
}

.hero__search-input {
    width: 100%;
    padding: var(--space-4) var(--space-4) var(--space-4) 3rem;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.hero__search-input::placeholder {
    color: var(--color-muted);
}

.hero__search-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-md), 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.hero__search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-muted);
    pointer-events: none;
}

.hero__search-icon svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* Floating decorative shapes */
.hero__decor {
    position: absolute;
    border-radius: 50%;
    opacity: 0.06;
    pointer-events: none;
}

.hero__decor--1 {
    width: 20rem;
    height: 20rem;
    background: var(--color-accent-start);
    top: -6rem;
    right: -6rem;
    animation: float 8s ease-in-out infinite;
}

.hero__decor--2 {
    width: 14rem;
    height: 14rem;
    background: var(--color-accent-end);
    bottom: -4rem;
    left: -4rem;
    animation: float 6s ease-in-out infinite reverse;
}

.hero__decor--3 {
    width: 8rem;
    height: 8rem;
    background: var(--color-primary);
    top: 30%;
    left: 10%;
    animation: float 10s ease-in-out infinite;
}


/* ==============================
   TOOL GRID (Homepage)
   ============================== */
.tools-section {
    padding: var(--space-12) var(--space-4) var(--space-16);
}

.tools-section__inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.tools-section__header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.tools-section__header p {
    max-width: 28rem;
    margin: 0 auto;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
    gap: var(--space-4);
}

.tool-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.tool-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}

.tool-card__icon {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.tool-card__icon svg {
    width: 1.25rem;
    height: 1.25rem;
}

.tool-card__body {
    flex: 1;
    min-width: 0;
}

.tool-card__label {
    font-weight: 600;
    font-size: var(--font-size-base);
    display: block;
    margin-bottom: var(--space-1);
}

.tool-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin: 0;
}


/* ==============================
   FEATURES SECTION (Homepage)
   ============================== */
.features {
    padding: var(--space-16) var(--space-4);
    background: var(--color-bg-alt);
}

.features__inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.features__header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
    gap: var(--space-6);
}

.feature-card {
    text-align: center;
    padding: var(--space-8) var(--space-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-sm);
}

.feature-card__icon {
    font-size: 2rem;
    margin-bottom: var(--space-4);
    display: block;
}

.feature-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.feature-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.5;
}


/* ==============================
   CONVERTER (Tool pages)
   ============================== */
.converter-page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-8) var(--space-4) var(--space-12);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin-bottom: var(--space-6);
}

.breadcrumb a {
    color: var(--color-muted);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.breadcrumb__sep {
    color: var(--color-border);
}

.converter {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-xs);
}

.converter__row {
    display: flex;
    gap: var(--space-3);
    align-items: flex-end;
    margin-bottom: var(--space-4);
}

.converter__field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.converter__label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.converter__input,
.converter__select {
    width: 100%;
    padding: var(--space-3);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: none;
}

.converter__input:focus,
.converter__select:focus {
    border-color: var(--color-border-focus);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.converter__select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

/* Swap button */
.converter__swap {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    align-self: flex-end;
}

.converter__swap:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.converter__swap svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Result */
.converter__result {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    min-height: 3.5rem;
    cursor: pointer;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.converter__result:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.converter__result-value {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    font-family: var(--font-mono);
    word-break: break-all;
}

.converter__result-unit {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin-left: var(--space-2);
    font-weight: 400;
    font-family: var(--font-family);
}

.converter__copy-icon {
    flex-shrink: 0;
    color: var(--color-muted);
    transition: color var(--transition-fast);
}

.converter__result:hover .converter__copy-icon {
    color: var(--color-primary);
}

.converter__copy-icon svg {
    width: 1.125rem;
    height: 1.125rem;
}

/* Copied feedback */
.converter__copied {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 500;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.converter__copied.is-visible {
    opacity: 1;
}

/* Error message */
.converter__error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    min-height: 1.25rem;
    margin-top: var(--space-1);
}

/* Precision selector */
.converter__precision {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.converter__precision select {
    padding: var(--space-1) var(--space-3);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

/* Formula disclosure */
.converter__formula {
    margin-top: var(--space-6);
}

.converter__formula summary {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    cursor: pointer;
    user-select: none;
    padding: var(--space-2) 0;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.converter__formula summary:hover {
    color: var(--color-primary);
}

.converter__formula-content {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--space-3) 0;
    font-family: var(--font-mono);
    line-height: 1.8;
}


/* ==============================
   AD SLOTS
   ============================== */
.ad-slot {
    min-height: 5.625rem;
    background: var(--color-ad-bg);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    color: var(--color-muted);
    margin: var(--space-6) 0;
    overflow: hidden;
    gap: var(--space-1);
}

.ad-slot__label {
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}


/* ==============================
   FOOTER
   ============================== */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-12) var(--space-4) var(--space-8);
    background: var(--color-bg-alt);
}

.footer__inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer__col h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.footer__col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer__col a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer__col a:hover {
    color: var(--color-primary);
}

.footer__bottom {
    max-width: var(--max-width-wide);
    margin: var(--space-8) auto 0;
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
}

.footer__kofi {
    display: inline-flex;
}

@media (max-width: 640px) {
    .footer__inner {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        text-align: center;
    }

    .footer__bottom {
        flex-direction: column;
        text-align: center;
    }
}


/* ==============================
   LEGAL PAGES
   ============================== */
.legal {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-8) var(--space-4) var(--space-12);
}

.legal h2 {
    margin-top: var(--space-8);
}

.legal p,
.legal li {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
}

.legal ul {
    padding-left: var(--space-6);
    margin-bottom: var(--space-4);
}


/* ==============================
   RESPONSIVE – Converter
   ============================== */
@media (max-width: 640px) {
    .converter__row {
        flex-direction: column;
        align-items: stretch;
    }

    .converter__swap {
        align-self: center;
        transform: rotate(90deg);
    }

    .hero {
        padding: var(--space-12) var(--space-4) var(--space-10);
    }

    .hero__title {
        font-size: clamp(1.75rem, 6vw, 2.5rem);
    }
}

/* ==============================
   COOKIE CONSENT BANNER
   ============================== */
.cookie-banner {
    position: fixed;
    bottom: var(--space-6);
    left: var(--space-4);
    right: var(--space-4);
    max-width: 44rem;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    transform: translateY(150%) scale(0.95);
    opacity: 0;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
}

.cookie-banner.is-visible {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.cookie-banner__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height);
}

.cookie-banner__text a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.cookie-banner__actions {
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--color-bg);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border: 1px solid var(--color-primary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-primary:hover {
    background: var(--color-primary-hover, #2563eb);
}

@media (min-width: 640px) {
    .cookie-banner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .cookie-banner__text {
        flex: 1;
    }
}

/* ==============================
   ARTICLE CONTENT (AdSense SEO)
   ============================== */
.article-content {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.article-content h2,
.article-content h3 {
    margin-top: var(--space-8);
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.article-content h2 {
    font-size: var(--font-size-xl);
}

.article-content h3 {
    font-size: var(--font-size-lg);
}

.article-content p,
.article-content ul,
.article-content ol {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

.article-content ul,
.article-content ol {
    padding-left: var(--space-6);
}

.article-content li {
    margin-bottom: var(--space-2);
}