/* ========================================
   CSS Custom Properties (Variables)
   ======================================== */
:root {
    /* Color palette - based on logo colors */
    --primary: #4f6bed;
    --primary-dark: #3b5bdb;
    --primary-light: #748ffc;
    --accent: #ff6b35;
    --accent-dark: #e85a2a;

    /* Neutral colors */
    --light-backdrop: #e5e7eb;
    --dark-backdrop: #4b5563;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #f9fafb;
    --surface: #ffffff;

    /* Link color */
    --link-color: #4f6bed;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Accent with alpha for shadows */
    --accent-shadow: rgba(255, 107, 53, 0.3);
    --accent-shadow-hover: rgba(255, 107, 53, 0.4);
    --primary-alpha: rgba(79, 107, 237, 0.08);
    --primary-shadow: rgba(79, 107, 237, 0.1);
}

/* ========================================
   Dark Mode
   ======================================== */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #748ffc;
        --primary-dark: #5c7cfa;
        --primary-light: #91a7ff;
        --accent: #ff8c5a;
        --accent-dark: #ff6b35;

        --light-backdrop: #374151;
        --dark-backdrop: #1f2937;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
        --background: #111827;
        --surface: #1f2937;

        --link-color: #748ffc;

        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
        --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);

        --accent-shadow: rgba(255, 140, 90, 0.3);
        --accent-shadow-hover: rgba(255, 140, 90, 0.4);
        --primary-alpha: rgba(116, 143, 252, 0.15);
        --primary-shadow: rgba(116, 143, 252, 0.2);
    }
}

/* ========================================
   Base Styles
   ======================================== */
*, *::before {
    box-sizing: border-box;
    margin-top: 0;
}

html {
    position: relative;
    height: 100%;
    background: var(--background);
    color: var(--text-primary);
    color-scheme: light dark;
}

body {
    font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* ========================================
   Header
   ======================================== */
header {
    background: var(--surface);
    border-bottom: 3px solid var(--primary);
    box-shadow: var(--shadow-md);
    padding: 0;
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .header-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    height: 64px;
}

header .logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    transition: color var(--transition-fast);
    flex-shrink: 0;
}

header .logo img {
    width: 28px;
    height: 28px;
}

header .logo:hover {
    color: var(--primary);
}

header nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

header nav a {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

header nav a:hover {
    color: var(--primary);
    background: var(--primary-alpha);
}

header .header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

header form label {
    position: absolute;
    left: -4000px;
}

header form input[type=search] {
    padding: 10px 16px;
    border: 1px solid var(--light-backdrop);
    border-radius: var(--radius-full);
    outline: none;
    background: var(--background);
    color: var(--text-primary);
    font-size: 14px;
    width: 200px;
    transition: all var(--transition-normal);
}

header form input[type=search]:focus {
    width: 260px;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--primary-shadow);
}

header form input[type=search]::placeholder {
    color: var(--text-secondary);
}

header form button {
    display: none;
}

header .cta-button {
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px var(--accent-shadow);
    white-space: nowrap;
}

header .cta-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--accent-shadow-hover);
    color: white;
}

/* ========================================
   Main Content
   ======================================== */
main {
    margin: 30px 0 0 0;
    flex: 1;
}

.container {
    max-width: 1152px;
    margin: 0 auto;
    padding: 0 .5em;
    position: relative;
}

/* ========================================
   Extension Grid
   ======================================== */
.extgrid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(200px, calc(50% - 8px)), 1fr));
    margin: 1.5em 0;
    gap: 16px;
}

.extgrid figure {
    margin: 0;
    padding: 20px 16px;
    border: 1px solid var(--light-backdrop);
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    background: var(--surface);
    transition: all var(--transition-normal);
}

.extgrid figure > a {
    text-decoration: none;
    color: inherit;
}

.extgrid figure.invalid::before {
    content: "⚠";
    color: #f59e0b;
    font-weight: bold;
    position: absolute;
    right: .8em;
    top: .5em;
    font-size: 1.2em;
}

.extgrid figcaption {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: .75em;
    color: var(--text-primary);
    font-size: 1em;
}

.extgrid p,
.extgrid span {
    color: var(--text-secondary);
    font-size: .85em;
}

.extgrid .version {
    margin-bottom: .75em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.extgrid .version a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    font-size: .85em;
    line-height: 1;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px var(--accent-shadow);
}

.extgrid .version a:hover {
    transform: translateY(-1px) scale(1.1);
    box-shadow: 0 4px 8px var(--accent-shadow-hover);
    color: white;
}

.extgrid .description {
    text-align: left;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    height: 55px;
    font-size: .8em;
    margin: .5em 0;
    line-height: 1.5;
}

/* ========================================
   Common Elements
   ======================================== */
.icon {
    width: 90px;
    height: 90px;
    border-radius: var(--radius-md);
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover,
a:focus {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
}

.feed {
    position: absolute;
    right: .7em;
    padding: 8px 12px 8px 36px;
    background: url("/img/icon-16x16.png") var(--surface) no-repeat 12px center;
    font-size: .9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid var(--light-backdrop);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

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

.shadow {
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.shadow:hover,
.shadow:focus-within {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

dt {
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   Pagination
   ======================================== */
#paging {
    text-align: center;
    margin: 2em 0;
    display: flex;
    justify-content: center;
    gap: 1em;
}

#paging a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    padding: .75em 1.5em;
    background: var(--surface);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

#paging a:hover {
    background: var(--primary);
    color: white;
}

/* ========================================
   Footer
   ======================================== */
footer {
    background: var(--dark-backdrop);
    color: rgba(255, 255, 255, 0.8);
    margin-top: auto;
    padding: 1.5rem 0;
}

footer .container {
    text-align: center;
}

footer a {
    color: rgba(255, 255, 255, 0.9);
    transition: color var(--transition-fast);
}

footer a:hover {
    color: white;
}

footer .separator {
    margin: 0 0.75em;
    opacity: 0.5;
}

footer #copyright {
    font-size: .85em;
    margin: 0;
}

/* ========================================
   Hamburger Menu (hidden by default, mobile only)
   ======================================== */
.hamburger-toggle,
.hamburger-btn,
.mobile-menu,
.mobile-menu-overlay {
    display: none;
}

/* ========================================
   Responsive - Tablet/Mobile
   ======================================== */
@media screen and (max-width: 900px) {
    header .header-content {
        gap: 1rem;
    }

    header nav,
    header .header-actions,
    .feed {
        display: none;
    }

    .hamburger-btn {
        display: -webkit-flex;
        display: flex;
        -webkit-flex-direction: column;
        flex-direction: column;
        -webkit-justify-content: center;
        justify-content: center;
        gap: 5px;
        cursor: pointer;
        padding: 8px;
        margin-left: auto;
        z-index: 200;
        -webkit-tap-highlight-color: transparent;
    }

    .hamburger-btn span {
        display: block;
        width: 22px;
        height: 2px;
        background: var(--text-primary);
        border-radius: 2px;
        -webkit-transition: all 0.15s ease;
        transition: all 0.15s ease;
    }

    .hamburger-toggle:checked ~ .hamburger-btn span:nth-child(1) {
        -webkit-transform: rotate(45deg) translate(5px, 5px);
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger-toggle:checked ~ .hamburger-btn span:nth-child(2) {
        opacity: 0;
    }

    .hamburger-toggle:checked ~ .hamburger-btn span:nth-child(3) {
        -webkit-transform: rotate(-45deg) translate(5px, -5px);
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .mobile-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 3px solid var(--primary);
        -webkit-box-shadow: var(--shadow-lg);
        box-shadow: var(--shadow-lg);
        padding: 1rem;
        -webkit-flex-direction: column;
        flex-direction: column;
        -webkit-align-items: center;
        align-items: center;
        gap: 0.5rem;
        z-index: 150;
    }

    .hamburger-toggle:checked ~ .mobile-menu {
        display: -webkit-flex;
        display: flex;
    }

    .mobile-menu .mobile-search {
        display: block;
        width: 250px;
        max-width: 250px;
        min-width: 250px;
    }

    .mobile-menu .mobile-search label {
        position: absolute;
        left: -4000px;
    }

    .mobile-menu .mobile-search input[type=search] {
        display: block;
        width: 250px !important;
        max-width: 250px !important;
        min-width: 0;
        padding: 10px 16px;
        border: 1px solid var(--light-backdrop);
        border-radius: var(--radius-full);
        outline: none;
        background: var(--background);
        color: var(--text-primary);
        font-size: 16px;
        -webkit-appearance: none;
        appearance: none;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
    }

    .mobile-menu .mobile-search input[type=search]:focus {
        border-color: var(--primary);
        background: var(--surface);
        -webkit-box-shadow: 0 0 0 3px var(--primary-shadow);
        box-shadow: 0 0 0 3px var(--primary-shadow);
    }

    .mobile-menu .mobile-search input[type=search]::-webkit-input-placeholder {
        color: var(--text-secondary);
    }

    .mobile-menu .mobile-search input[type=search]::placeholder {
        color: var(--text-secondary);
    }

    .mobile-menu .mobile-search button {
        display: none;
    }

    .mobile-menu nav {
        display: -webkit-flex;
        display: flex;
        -webkit-flex-direction: column;
        flex-direction: column;
        gap: 0;
    }

    .mobile-menu nav a {
        padding: 0.75rem 1rem;
        text-decoration: none;
        color: var(--text-secondary);
        font-size: 0.95rem;
        font-weight: 500;
        border-radius: var(--radius-md);
    }

    .mobile-menu nav a:hover,
    .mobile-menu nav a:active {
        color: var(--primary);
        background: var(--primary-alpha);
    }
}

/* ========================================
   Responsive - Mobile
   ======================================== */
@media screen and (max-width: 480px) {
    footer .separator {
        display: none;
    }

    footer #copyright {
        display: flex;
        flex-direction: column;
        gap: 0.5em;
    }
}

/* ========================================
   Safe Area (iPhone notch)
   ======================================== */
@supports (padding: env(safe-area-inset-left)) {
    .container {
        padding-left: max(.5em, env(safe-area-inset-left));
        padding-right: max(.5em, env(safe-area-inset-right));
    }
}