:root {
    /* Font Family */
    --font-family: "Noto Sans", sans-serif;
    /* Colors */
    --neutral-900: #091540;
    --neutral-800: #202535;
    --neutral-700: #2f364b;
    --neutral-600: #535868;
    --neutral-300: #c6c6c6;
    --neutral-200: #d6e2f5;
    --neutral-100: #eeeeee;
    --neutral-0: #fbfdfe;
    --red-400: #f25c54;
    --red-500: #de4840;
    --red-700: #c7231a;
    --color-primary: var(--neutral-0);
    --color-secondary: var(--red-700);
    --color-background: #ffffff;
    --color-text: var(--neutral-900);
    --color-subtext: var(--neutral-600);
    --hover-background: var(--neutral-200);
    --button-background: inherit;
    --button-text: var(--neutral-900);
    --button-border: var(--neutral-300);
    --theme-switcher-background: var(--neutral-100);
    --color-border: #eaeaea;
    --light-gradient: linear-gradient(180deg, #ebf2fc 0%, #eefbf9 100%);
    --background-image: var(--light-gradient);

    /* Font Sizes */
    --font-size-xs: 1rem; /* 16px */
    --font-size-sm: 1.125rem; /* 18px */
    --font-size-md: 1.25rem; /* 20px */
    --font-size-lg: 1.5rem; /* 24px */
    --font-size-xl: 2.125rem; /* 34px */
    --font-size-2xl: 2.5rem; /* 40px */

    /* Font Weights */
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-black: 900;

    /* line heights */
    --line-height-xs: 1;
    --line-height-sm: 1.2;
    --line-height-md: 1.4;

    /* letter spacing */
    --letter-spacing-xs: -0.5px;
    --letter-spacing-sm: -0.3px;
    --letter-spacing-md: -0.2px;
    --letter-spacing-lg: -1px;

    /* Spacing */
    --spacing-0: 0;
    --spacing-025: 0.125rem; /* 2px */
    --spacing-05: 0.25rem; /* 4px */
    --spacing-075: 0.375rem; /* 6px */
    --spacing-1: 0.5rem; /* 8px */
    --spacing-125: 0.625rem; /* 10px */
    --spacing-15: 0.75rem; /* 12px */
    --spacing-175: 0.875rem; /* 14px */
    --spacing-2: 1rem; /* 16px */
    --spacing-25: 1.25rem; /* 20px */
    --spacing-3: 1.5rem; /* 24px */
    --spacing-35: 1.75rem; /* 28px */
    --spacing-4: 2rem; /* 32px */
    --spacing-45: 2.25rem; /* 36px */
    --spacing-5: 2.5rem; /* 40px */
    --spacing-55: 2.75rem; /* 44px */
    --spacing-6: 3rem; /* 48px */
    --spacing-65: 3.25rem; /* 52px */
    --spacing-7: 3.5rem; /* 56px */
    --spacing-75: 3.75rem; /* 60px */
    --spacing-8: 4rem; /* 64px */
    --spacing-85: 4.25rem; /* 68px */
    --spacing-9: 4.5rem; /* 72px */
    --spacing-95: 4.75rem; /* 76px */
    --spacing-10: 5rem; /* 80px */

    /* Border Radius */
    --radius-0: 0;
    --radius-2: 0.125rem; /* 2px */
    --radius-4: 0.25rem; /* 4px */
    --radius-6: 0.375rem; /* 6px */
    --radius-8: 0.5rem; /* 8px */
    --radius-10: 0.625rem; /* 10px */
    --radius-12: 0.75rem; /* 12px */
    --radius-16: 1rem; /* 16px */
    --radius-20: 1.25rem; /* 20px */
    --radius-24: 1.5rem; /* 24px */
    --radius-full: 999px;
    
    --sun-opacity: 0;
    --sun-rotation: 0deg;
    --moon-opacity: 1;
    --moon-rotation: 0deg;

    .dark-theme {
        --color-background: #1a1a1a;
        --color-primary: var(--neutral-800);
        --color-text: var(--neutral-0);
        --color-subtext: var(--neutral-300);
        --hover-background: var(--neutral-600);
        --color-border: #444444;
        --dark-gradient: linear-gradient(180deg, #04091b 0%, #091540 100%);
        --background-image: var(--dark-gradient);
        --theme-switcher-background: var(--neutral-700);
        --sun-opacity: 1;
        --sun-rotation: -45deg;
        --moon-opacity: 0;
        --moon-rotation: 45deg;
    }
}

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

body {
    font-family: var(--font-family);
    background-image: var(--background-image);
    transition: background-image 0.3s ease;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    padding-inline: var(--spacing-2);
    padding-top: var(--spacing-25);
    padding-bottom: var(--spacing-8);
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

input,
button,
textarea,
select {
    font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
    overflow-wrap: break-word;
}

a {
    text-decoration: none;
    color: inherit;
}

#root,
#__next {
    isolation: isolate;
}

/* Visually hide elements but keep them accessible */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@font-face {
    font-family: "Noto Sans";
    src: url("/assets/fonts/NotoSans-VariableFont_wdth,wght.ttf")
            format("truetype"),
        url("/assets/fonts/NotoSans-Italic-VariableFont_wdth,wght.ttf")
            format("truetype");
    font-weight: 100 900;
    font-stretch: 75% 125%;
    font-style: normal, italic;
}

.container {
    max-width: 73.125rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-5);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--color-primary);
    padding-block: var(--spacing-1);
    padding-inline: var(--spacing-15);
    border-radius: var(--radius-8);
}

.logo-link:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.dark-theme .logo-text {
    fill: var(--color-text);
}

.main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-5);
}

.main-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: var(--line-height-xs);
}

/* Dark and light mode theme switcher */
.theme-switcher {
    --size: 3.125rem;
    --icon-size: 1.5rem;
    background-color: var(--theme-switcher-background);
    border: none;
    padding: 0;
    position: relative;
    inline-size: var(--size);
    block-size: var(--size);
    aspect-ratio: 1;
    border-radius: var(--radius-12);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    outline-offset: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-switcher:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.theme-icon {
    width: var(--icon-size);
    height: var(--icon-size);
    transition: opacity 0.3s ease, transform 0.3s ease;
    position: absolute; 
    margin: auto; 
}

/* Sun Icon */
.sun {
    opacity: var(--sun-opacity, 0);
    transform: rotate(var(--sun-rotation, 0deg));
}

/* Moon Icon */
.moon {
    opacity: var(--moon-opacity, 1);
    transform: rotate(var(--moon-rotation, 0deg));
}

/* status filters - ALL, ACTIVE , INACTIVE */
.control-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: var(--radius-4);
    gap: var(--spacing-3);
}

.status-filter {
    border: none;
    padding: 0;
}

/* Radio Group Container */
.radio-group {
    display: flex;
    gap: 0.5rem;
    border-radius: 0.5rem;
}

/* Radio Option Label */
.radio-option {
    position: relative;
    cursor: pointer;
    margin: 0;
    display: flex;
    align-items: center;
}

/* Hide the radio-custom element completely */
.radio-custom {
    display: none;
}

.radio-label {
    display: inline-block;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-background);
    transition: all 0.2s ease;
}

/* Selected State */
.radio-option input[type="radio"]:checked + .radio-custom + .radio-label {
    background: var(--radio-checked-bg, var(--red-500, #de4840));
    color: var(--radio-checked-text, #fff);
}

/* Hover State */
.radio-option:hover .radio-label {
    background: var(--hover-background, #e0e0e0);
}

/* Focus State */
.radio-option input[type="radio"]:focus-visible + .radio-custom + .radio-label {
    outline: 2px solid var(--focus-color, var(--color-secondary));
    outline-offset: 2px;
}

/* CARDS SECTION */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-15);
    grid-auto-rows: 1fr;
}

.card {
    background: var(--color-primary);
    border-radius: var(--radius-20);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: var(--spacing-25);
    transition: transform 0.2s ease, background 0.3s ease;
}

.card-content {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.card-hidden {
    display: none;
}

.card-details {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-2);
    align-items: start;
}

.card-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.card-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    line-height: var(--line-height-sm);
    letter-spacing: var(--letter-spacing-md);
}
.card-description {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-regular);
    color: var(--color-subtext);
    line-height: var(--line-height-md);
    letter-spacing: var(--letter-spacing-xs);
}

.card:hover {
    transform: translateY(-2px);
}
.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-3);
}

/* Toggle a card from active to inactive or vice-versa */
.switch {
    position: relative;
    display: inline-block;
    width: 3rem;
    height: 1.5rem;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--neutral-300);
    transition: 0.4s;
    border-radius: var(--radius-full);
}

.slider::before {
    position: absolute;
    content: "";
    height: 1.25rem;
    width: 1.25rem;
    left: 0.125rem;
    bottom: 0.125rem;
    background-color: var(--neutral-0);
    transition: 0.4s;
    border-radius: var(--radius-full);
}

input:checked + .slider {
    background-color: var(--color-secondary);
}

input:checked + .slider::before {
    transform: translateX(1.5rem);
}

input:focus + .slider {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

.remove-btn {
    background: var(--button-background);
    color: var(--color-text);
    border: 1px solid var(--button-border);
    padding-block: var(--spacing-075);
    padding-inline: var(--spacing-2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background 0.3s ease;
}
.remove-btn:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}
.remove-btn:hover {
    background: var(--red-700);
    color: var(--color-primary);
}

/* Loading spinner */
.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top: 4px solid #3498db;
    width: 120px;
    height: 120px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.error {
    color: red;
    text-align: center;
    padding: 20px;
}

@media (min-width: 38.75rem) {
    /* 620px in rems */
    body {
        padding-inline: var(--spacing-4);
        padding-top: var(--spacing-3);
    }
    .header {
        padding-block: var(--spacing-15);
        padding-inline: var(--spacing-2);
    }
    .radio-label {
        font-size: var(--font-size-md);
    }
    .main {
        gap: var(--spacing-35);
    }
    .control-panel {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    .status-filter {
        margin: 0;
    }
}

@media (min-width: 64rem) {
    /* 1024px in rems */
    body {
        padding-top: var(--spacing-5);
    }
    .container {
        gap: var(--spacing-8);
    }
}