/* light theme */
:root {
    --gt-glass-btn-border-radius: 999vw;
    --gt-glass-btn-font-size: 0.65rem;
    --gt-glass-btn-container: #DFDFDF;
    --gt-glass-btn-border-color: #DCD6CC;
    --gt-glass-btn-top-blur-undershadow: rgba(0, 0, 0, 0.2);
    --gt-glass-btn-bottom-blur-undershadow: rgba(0, 0, 0, 0.1);
    --gt-glass-btn-top-border-box-shadow: rgba(0, 0, 0, 0.05);
    --gt-glass-btn-right-undershine: rgba(255, 255, 255, 0.2);
    --gt-glass-btn-right-end-undershine: rgba(255, 255, 255, 0);
    --gt-glass-btn-left-undershine: rgba(255, 255, 255, 0);
    --gt-glass-btn-anim-hover-time: 400ms;
    --gt-glass-btn-anim-hover-ease: cubic-bezier(0.25, 1, 0.5, 1);
}

/* dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --gt-glass-btn-container: #454545;
        --gt-glass-btn-border-color: #645048;
        --gt-glass-btn-top-blur-undershadow: rgba(255, 255, 255, 0.2);
        --gt-glass-btn-bottom-blur-undershadow: rgba(255, 255, 255, 0.08);
        --gt-glass-btn-top-border-box-shadow: rgba(255, 255, 255, 0.05);
        --gt-glass-btn-right-undershine: rgba(0, 0, 0, 0.1);
        --gt-glass-btn-right-end-undershine: rgba(0, 0, 0, 0);
        --gt-glass-btn-left-undershine: rgba(0, 0, 0, 0);
    }
}

@media (min-width: 1024px) {
    :root {
        --gt-glass-btn-font-size: 0.9rem;
    }
}

@media (min-width: 1280px) {
    :root {
        --gt-glass-btn-font-size: 0.95rem;
    }
}

@media (min-width: 1800px) {
    :root {
        --gt-glass-btn-font-size: 1.2rem;
    }
}

@media (min-width: 2200px) {
    :root {
        --gt-glass-btn-font-size: 1.7rem;
    }
}

/* Defs */
@property --angle-1 {
    syntax: "<angle>";
    inherits: false;
    initial-value: -75deg;
}

@property --angle-2 {
    syntax: "<angle>";
    inherits: false;
    initial-value: -45deg;
}

/* Button Wrap Container */
.gt-glass-btn-wrapper {
    position: relative;
    z-index: 50;
    border-radius: var(--gt-glass-btn-border-radius);
    border-width: 1px;
    border-style: solid;
    border-color: var(--gt-glass-btn-border-color);
    background: var(--gt-glass-btn-container);
    pointer-events: none;
    transition: all var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease);
}

/* Button Shadow Container */
.gt-glass-btn-shadow {
    --shadow-cuttoff-fix: 2em;
    position: absolute;
    width: calc(100% + var(--shadow-cuttoff-fix));
    height: calc(100% + var(--shadow-cuttoff-fix));
    top: calc(0% - var(--shadow-cuttoff-fix) / 2);
    left: calc(0% - var(--shadow-cuttoff-fix) / 2);
    filter: blur(clamp(2px, 0.125em, 12px));
    -webkit-filter: blur(clamp(2px, 0.125em, 12px));
    -moz-filter: blur(clamp(2px, 0.125em, 12px));
    -ms-filter: blur(clamp(2px, 0.125em, 12px));
    overflow: visible;
    pointer-events: none;
}

/* Shadow */
.gt-glass-btn-shadow::after {
    content: "";
    position: absolute;
    z-index: 0;
    inset: 0;
    border-radius: var(--gt-glass-btn-border-radius);
    background: linear-gradient(180deg, var(--gt-glass-btn-top-blur-undershadow), var(--gt-glass-btn-bottom-blur-undershadow));
    width: calc(100% - var(--shadow-cuttoff-fix) - 0.25em);
    height: calc(100% - var(--shadow-cuttoff-fix) - 0.25em);
    top: calc(var(--shadow-cuttoff-fix) - 0.5em);
    left: calc(var(--shadow-cuttoff-fix) - 0.875em);
    padding: 0.125em;
    box-sizing: border-box;
    mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    mask-composite: exclude;
    transition: all var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease);
    overflow: visible;
    opacity: 1;
}

/* ========== BUTTON BASE STYLES ========== */

button {
    /* Basic Styling */
    --border-width: clamp(1px, 0.0625em, 4px);
    all: unset;
    cursor: pointer;
    position: relative;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    pointer-events: auto;
    z-index: 3;
    background: linear-gradient(
            -75deg,
            rgba(255, 255, 255, 0.05),
            rgba(255, 255, 255, 0.2),
            rgba(255, 255, 255, 0.05)
    );
    border-radius: var(--gt-glass-btn-border-radius);
    box-shadow: inset 0 0.125em 0.125em var(--gt-glass-btn-top-border-box-shadow),
    inset 0 -0.125em 0.125em rgba(255, 255, 255, 0.5),
    0 0.25em 0.125em -0.125em rgba(0, 0, 0, 0.2),
    0 0 0.1em 0.25em inset rgba(255, 255, 255, 0.2),
    0 0 0 0 rgba(255, 255, 255, 1);
    backdrop-filter: blur(clamp(1px, 0.125em, 4px));
    -webkit-backdrop-filter: blur(clamp(1px, 0.125em, 4px));
    -moz-backdrop-filter: blur(clamp(1px, 0.125em, 4px));
    -ms-backdrop-filter: blur(clamp(1px, 0.125em, 4px));
    transition: all var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease);
}

button:hover {
    transform: scale(0.975);
    backdrop-filter: blur(0.01em);
    -webkit-backdrop-filter: blur(0.01em);
    -moz-backdrop-filter: blur(0.01em);
    -ms-backdrop-filter: blur(0.01em);
    box-shadow: inset 0 0.125em 0.125em rgba(0, 0, 0, 0.05),
    inset 0 -0.125em 0.125em rgba(255, 255, 255, 0.5),
    0 0.15em 0.05em -0.1em rgba(0, 0, 0, 0.25),
    0 0 0.05em 0.1em inset rgba(255, 255, 255, 0.5),
    0 0 0 0 rgba(255, 255, 255, 1);
}

/* Button Text */
button span {
    position: relative;
    display: block;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    letter-spacing: -0.05em;
    font-weight: 500;
    font-size: var(--gt-glass-btn-font-size);
    color: var(--gt-link-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-shadow: 0 0.25em 0.05em rgba(0, 0, 0, 0.1);
    transition: all var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease);
    padding-inline: 1.5em;
    padding-block: 0.875em;
}

button:hover span {
    text-shadow: 0.025em 0.025em 0.025em rgba(0, 0, 0, 0.12);
}

/* Text */
button span::after {
    content: "";
    display: block;
    position: absolute;
    width: calc(100% - var(--border-width)); /* Prevent overlapping border */
    height: calc(100% - var(--border-width));
    top: calc(0% + var(--border-width) / 2);
    left: calc(0% + var(--border-width) / 2);
    box-sizing: border-box;
    border-radius: var(--gt-glass-btn-border-radius);
    overflow: clip;
    z-index: 3;
    mix-blend-mode: screen;
    pointer-events: none;
    background-size: 200% 200%;
    background: linear-gradient(
            var(--angle-2),
            var(--gt-glass-btn-right-end-undershine) 0%,
            var(--gt-glass-btn-right-undershine) 30% 40%,
            var(--gt-glass-btn-left-undershine) 65%
    ) no-repeat 0 50%;
    transition: background-position calc(var(--gt-glass-btn-anim-hover-time) * 1.25) var(--gt-glass-btn-anim-hover-ease),
    --angle-2 calc(var(--gt-glass-btn-anim-hover-time) * 1.25) var(--gt-glass-btn-anim-hover-ease);
}

button:hover span::after {
    background-position: 25% 50%;
}

button:active span::after {
    background-position: 50% 15%;
    --angle-2: -15deg;
}

/* Touch Devices */
@media (hover: none) and (pointer: coarse) {
    button span::after,
    button:active span::after {
        --angle-2: -45deg;
    }
}

/* ========== BUTTON OUTLINE ========== */

/* Outline */
button::after {
    content: "";
    position: absolute;
    z-index: 1;
    inset: 0;
    border-radius: var(--gt-glass-btn-border-radius);
    width: calc(100% + var(--border-width));
    height: calc(100% + var(--border-width));
    top: calc(0% - var(--border-width) / 2);
    left: calc(0% - var(--border-width) / 2);
    padding: var(--border-width);
    box-sizing: border-box;
    background: conic-gradient(
            from var(--angle-1) at 50% 50%,
            rgba(0, 0, 0, 0.5),
            rgba(0, 0, 0, 0) 5% 30%,
            rgba(0, 0, 0, 0.5) 50%,
            rgba(0, 0, 0, 1) 60% 95%,
            rgba(0, 0, 0, 0.5)
    ),
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.5));
    mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
    mask-composite: exclude;
    transition: all var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease),
    --angle-1 500ms ease;
    box-shadow: inset 0 0 0 calc(var(--border-width) / 2) rgba(255, 255, 255, 0.5);
}

button:hover::after {
    --angle-1: -125deg;
}

button:active::after {
    --angle-1: -75deg;
}

@media (hover: none) and (pointer: coarse) {
    button::after,
    button:hover::after,
    button:active::after {
        --angle-1: -75deg;
    }
}

/* Shadow Hover */
.gt-glass-btn-wrapper:has(button:hover) .gt-glass-btn-shadow {
    filter: blur(clamp(2px, 0.0625em, 6px));
    -webkit-filter: blur(clamp(2px, 0.0625em, 6px));
    -moz-filter: blur(clamp(2px, 0.0625em, 6px));
    -ms-filter: blur(clamp(2px, 0.0625em, 6px));
    transition: filter var(--gt-glass-btn-anim-hover-time) var(--gt-glass-btn-anim-hover-ease);
}

.gt-glass-btn-wrapper:has(button:hover) .gt-glass-btn-shadow::after {
    top: calc(var(--shadow-cuttoff-fix) - 0.875em);
    opacity: 1;
}

/* Rotation */
.gt-glass-btn-wrapper:has(button:active) {
    transform: rotate3d(1, 0, 0, 25deg);
}

.gt-glass-btn-wrapper:has(button:active) button {
    box-shadow: inset 0 0.125em 0.125em rgba(0, 0, 0, 0.05),
    inset 0 -0.125em 0.125em rgba(255, 255, 255, 0.5),
    0 0.125em 0.125em -0.125em rgba(0, 0, 0, 0.2),
    0 0 0.1em 0.25em inset rgba(255, 255, 255, 0.2),
    0 0.225em 0.05em 0 rgba(0, 0, 0, 0.05),
    0 0.25em 0 0 rgba(255, 255, 255, 0.75),
    inset 0 0.25em 0.05em 0 rgba(0, 0, 0, 0.15);
}

.gt-glass-btn-wrapper:has(button:active) .gt-glass-btn-shadow {
    filter: blur(clamp(2px, 0.125em, 12px));
    -webkit-filter: blur(clamp(2px, 0.125em, 12px));
    -moz-filter: blur(clamp(2px, 0.125em, 12px));
    -ms-filter: blur(clamp(2px, 0.125em, 12px));
}

.gt-glass-btn-wrapper:has(button:active) .gt-glass-btn-shadow::after {
    top: calc(var(--shadow-cuttoff-fix) - 0.5em);
    opacity: 0.75;
}

.gt-glass-btn-wrapper:has(button:active) span {
    text-shadow: 0.025em 0.25em 0.05em rgba(0, 0, 0, 0.12);
}