/* --- global --- */
:root {
    /* base */
    --primary: #1e3a8a;
    --color-bg: #0D1B2A;
    --accent: #3b82f6;
    --background: #273b57;
    --neutral: #f5f5f5;
    --text-light: #e2e8f0;
    --color-accent: #d1ac4e;
    --color-card-bg: #1C2635;
    --text-muted: #9CA3AF;

    /* ----- Spacing System ----- */
    --space-xs: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;

    /* ----- Border Radius ----- */
    --radius-md: 8px;

    /* ----- Typography ----- */
    --font-family-base: "Inter", sans-serif;
    --font-family-title: "Merriweather", serif;
    --font-size-xxl: 2rem;

    /* ----- Font weights ----- */
    --weight-regular: 400;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* ----- Shadows ----- */
    --shadow-soft: 0 1px 4px rgba(0, 0, 0, 0.1);
}

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

body {
    margin: 0;
    padding: 0;
    background-color: var(--color-bg);
    background-size: cover;
    min-height: 100vh;
    color: var(--text-light);
    font-family: var(--font-family-base);
    font-weight: var(--weight-regular);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

@supports (min-height: 100dvh) {
    body {
        min-height: 100dvh;
    }
}

/* === HEADER === */
header {
    min-width: 100%;
    background-color: var(--primary);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.title {
    font-family: var(--font-family-title);
    font-size: var(--font-size-xxl);
    font-weight: var(--weight-bold);
    text-align: start;
    letter-spacing: 0.02em;
}

/* --- nav bar --- */
.nav .nav-list {
    display: flex;
    justify-content: center;
    list-style-type: none;
    gap: var(--space-xs);
}

.nav .nav-link {
    color: var(--neutral);
    transition: color 150ms ease;
    margin: var(--space-xs);
}

.nav .nav-link:hover {
    color: var(--text-muted);
    text-decoration: underline;
    text-decoration-thickness: 1.4px;
}

.nav .nav-link.active {
    color: var(--color-accent);
    font-weight: var(--weight-semibold);
}

/* === MAIN === */
main {
    padding: var(--space-lg);
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin-inline: auto;
    margin-top: var(--space-lg);
}

.skeleton {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(8, 1fr);
    gap: var(--space-md);
}

/* === SKELETON === */
.skeleton>div {
    background-color: var(--color-card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    /* animation section */
    background-image: linear-gradient(-50deg,
            /* you can add any value for the degree */
            var(--color-card-bg) 0%,
            var(--color-card-bg) 40%,
            var(--background) 50%,
            var(--color-card-bg) 60%,
            var(--color-card-bg) 100%);

    background-size: 200% 100%;
    /* this makes the background twice as wide so it can slide across the container */

    background-position-x: 100%;
    /* starts the background at the right edge */

    animation: loader 1.5s infinite;
    /* applies the infinite animation loop */
}

.div1 {
    grid-column: span 1 / span 1;
    grid-row: span 2 / span 2;
}

.div2 {
    grid-column-start: 1;
    grid-row-start: 3;
}

.div3 {
    grid-row: span 2 / span 1;
    grid-column-start: 1;
    grid-row-start: 4;
}

.div4 {
    grid-row: span 3 / span 3;
    grid-column-start: 1;
    grid-row-start: 5;
}

.div5 {
    grid-column: span 1 / span 1;
    grid-column-start: 1;
    grid-row-start: 8;
}

.div6 {
    grid-column-start: 1;
    grid-row-start: 9;
}

.div7 {
    grid-column-start: 1;
    grid-row-start: 10;
}

.div8 {
    grid-column: span 1 / span 1;
    grid-row: span 3 / span 3;
    grid-column-start: 1;
    grid-row-start: 11;
}

/* --- loading circle --- */
.loading-circle {
    width: 50px;
    height: 50px;
    border: 5px solid var(--color-bg);
    border-top: 5px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: var(--space-lg) auto;
}

/* --- animations --- */
@keyframes loader {
    to {
        /* moves the gradient all the way to the right edge */
        background-position-x: -100%;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* --- media queries --- */
@media screen and (min-width: 768px) {
    .skeleton {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(8, 1fr);
    }

    .div1 {
        grid-column: span 2 / span 2;
        grid-row: span 2 / span 2;
    }

    .div2 {
        grid-column-start: 1;
        grid-row-start: 3;
    }

    .div3 {
        grid-row: span 2 / span 2;
        grid-column-start: 1;
        grid-row-start: 4;
    }

    .div4 {
        grid-row: span 3 / span 3;
        grid-column-start: 2;
        grid-row-start: 3;
    }

    .div5 {
        grid-column: span 2 / span 2;
        grid-column-start: 1;
        grid-row-start: 6;
    }

    .div6 {
        grid-column-start: 1;
        grid-row-start: 7;
    }

    .div7 {
        grid-column-start: 2;
        grid-row-start: 7;
    }

    .div8 {
        grid-column: span 2 / span 2;
        grid-row: span 3 / span 3;
        grid-column-start: 1;
        grid-row-start: 8;
    }
}

@media screen and (min-width: 1024px) {
    .skeleton {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(4, 1fr);
    }

    .div1 {
        grid-column: span 2 / span 2;
        grid-row: span 2 / span 2;
    }

    .div2 {
        grid-column-start: 1;
        grid-row-start: 3;
    }

    .div3 {
        grid-row: span 2 / span 2;
        grid-column-start: 1;
        grid-row-start: 4;
    }

    .div4 {
        grid-row: span 3 / span 3;
        grid-column-start: 2;
        grid-row-start: 3;
    }

    .div5 {
        grid-column: span 2 / span 2;
        grid-column-start: 3;
        grid-row-start: 1;
    }

    .div6 {
        grid-column-start: 3;
        grid-row-start: 2;
    }

    .div7 {
        grid-column-start: 4;
        grid-row-start: 2;
    }

    .div8 {
        grid-column: span 2 / span 2;
        grid-row: span 3 / span 3;
        grid-column-start: 3;
        grid-row-start: 3;
    }
}

/* === FOOTER === */
footer {
    background-color: var(--primary);
    text-align: center;
    padding: var(--space-md);
}