:root {
    --motion-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --motion-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --motion-fast: 180ms;
    --motion-medium: 420ms;
    --motion-slow: 760ms;
}

/* Motion is opt-in through .motion-ready so content stays usable when JS is unavailable. */
body.motion-ready {
    overflow-x: hidden;
    background-image:
        radial-gradient(circle at 15% 0%, rgba(0, 240, 255, 0.08), transparent 28rem),
        radial-gradient(circle at 90% 8%, rgba(255, 0, 60, 0.06), transparent 24rem),
        radial-gradient(circle at 1px 1px, rgba(0, 240, 255, 0.035) 1px, transparent 0);
    background-position: 0 0, 0 0, 0 0;
    background-size: 100% 100%, 100% 100%, 40px 40px;
    animation: background-drift 24s linear infinite;
}

body.motion-ready::before {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    content: '';
    background: linear-gradient(115deg, transparent 0 42%, rgba(0, 240, 255, 0.055) 48%, transparent 54%);
    background-size: 240% 100%;
    opacity: 0.35;
    animation: light-sweep 16s var(--motion-ease-in-out) infinite;
}

body.motion-ready > * {
    position: relative;
    z-index: 1;
}

@keyframes background-drift {
    0%, 100% { background-position: 0 0, 0 0, 0 0; }
    50% { background-position: 2% -1%, -2% 1%, 20px 20px; }
}

@keyframes light-sweep {
    0%, 55% { background-position: 140% 0; }
    100% { background-position: -40% 0; }
}

@keyframes page-enter {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shell-enter {
    from { opacity: 0; transform: translate3d(0, 18px, 0) scale(0.985); }
    to { opacity: 1; transform: translate3d(0, 0, 0) scale(1); }
}

@keyframes rise-in {
    from { opacity: 0; transform: translate3d(0, 18px, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes list-item-in {
    from { opacity: 0; transform: translate3d(-12px, 0, 0) scale(0.985); }
    to { opacity: 1; transform: translate3d(0, 0, 0) scale(1); }
}

@keyframes viewer-in {
    from { opacity: 0; transform: translate3d(14px, 0, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes viewer-content-in {
    from { opacity: 0; transform: translate3d(0, 8px, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes logo-float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-3px) rotate(1deg); }
}

@keyframes border-sweep {
    0%, 100% { opacity: 0.25; transform: translateX(-110%); }
    45%, 65% { opacity: 0.9; transform: translateX(110%); }
}

@keyframes input-highlight {
    0% { box-shadow: 0 0 0 0 rgba(0, 240, 255, 0); }
    35% { box-shadow: 0 0 0 4px rgba(0, 240, 255, 0.14), 0 0 28px rgba(0, 240, 255, 0.18); }
    100% { box-shadow: 0 0 0 0 rgba(0, 240, 255, 0); }
}

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

@keyframes button-pop {
    0% { transform: scale(1); }
    45% { transform: scale(0.94); }
    100% { transform: scale(1); }
}

@keyframes feedback-pop {
    0% { opacity: 0.7; transform: scale(0.94); }
    65% { opacity: 1; transform: scale(1.04); }
    100% { opacity: 1; transform: scale(1); }
}

@keyframes menu-reveal {
    from { opacity: 0; transform: translateY(-8px); clip-path: inset(0 0 100% 0); }
    to { opacity: 1; transform: translateY(0); clip-path: inset(0 0 0 0); }
}

@keyframes ripple-out {
    from { opacity: 0.4; transform: translate(-50%, -50%) scale(0); }
    to { opacity: 0; transform: translate(-50%, -50%) scale(1); }
}

/* Shared page entrance and scroll reveal */
body.motion-ready > nav,
body.motion-ready > header,
body.motion-ready > footer {
    animation: page-enter var(--motion-slow) var(--motion-ease-out) both;
}

body.motion-ready [data-reveal] {
    opacity: 0;
    transform: translate3d(0, 18px, 0);
    transition: opacity var(--motion-medium) var(--motion-ease-out), transform var(--motion-medium) var(--motion-ease-out);
    transition-delay: var(--motion-delay, 0ms);
}

body.motion-ready [data-reveal].is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

body.motion-ready .feature-card,
body.motion-ready .feature-list-item,
body.motion-ready .blog-card,
body.motion-ready .contact-form,
body.motion-ready .danger-box,
body.motion-ready .code-block,
body.motion-ready .feature-check,
body.motion-ready .feature-cross,
body.motion-ready .step-item,
body.motion-ready .privacy-section,
body.motion-ready .endpoint-card,
body.motion-ready .quick-link-card,
body.motion-ready .checklist-item,
body.motion-ready .comparison-table {
    will-change: transform;
}

.feature-card,
.step-item,
.privacy-section,
.endpoint-card,
.quick-link-card,
.checklist-item,
.comparison-table {
    transition: transform var(--motion-fast) var(--motion-ease-out), border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}

.feature-card:hover,
.step-item:hover,
.privacy-section:hover,
.endpoint-card:hover,
.quick-link-card:hover,
.checklist-item:hover,
.comparison-table:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 240, 255, 0.38);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28), 0 0 24px rgba(0, 240, 255, 0.08);
}

.btn-tactical,
.btn-primary,
button,
a {
    -webkit-tap-highlight-color: transparent;
}

.btn-tactical,
.btn-primary,
button {
    position: relative;
    isolation: isolate;
}

.btn-tactical::after,
.btn-primary::after,
button::after {
    position: absolute;
    inset: 0;
    pointer-events: none;
    content: '';
    border: 1px solid rgba(255, 255, 255, 0.18);
    opacity: 0;
    transform: scale(0.96);
    transition: opacity var(--motion-fast) ease, transform var(--motion-fast) var(--motion-ease-out);
}

.btn-tactical:hover::after,
.btn-primary:hover::after,
button:hover::after,
.btn-tactical:focus-visible::after,
.btn-primary:focus-visible::after,
button:focus-visible::after {
    opacity: 1;
    transform: scale(1);
}

.btn-tactical:active,
.btn-primary:active,
button:active {
    transform: translateY(1px) scale(0.985);
}

.button-ripple {
    position: absolute;
    z-index: -1;
    width: 2rem;
    height: 2rem;
    pointer-events: none;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.36);
    animation: ripple-out 620ms var(--motion-ease-out) forwards;
}

/* Mobile menu gets a real open transition instead of an abrupt display toggle. */
#mobile-menu:not(.hidden)[data-menu-open="true"] {
    animation: menu-reveal 300ms var(--motion-ease-out) both;
    transform-origin: top center;
}

#mobile-menu a {
    position: relative;
    transition: color var(--motion-fast) ease, padding-left var(--motion-fast) var(--motion-ease-out), background-color var(--motion-fast) ease;
}

#mobile-menu a:hover,
#mobile-menu a:focus-visible {
    padding-left: 1.1rem;
}

/* Inbox shell motion */
body.motion-ready .tech-panel {
    position: relative;
    isolation: isolate;
    animation: shell-enter var(--motion-slow) var(--motion-ease-out) both;
}

body.motion-ready .tech-panel::after {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 3;
    width: 35%;
    height: 1px;
    pointer-events: none;
    content: '';
    background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.9), transparent);
    animation: border-sweep 5.5s var(--motion-ease-in-out) infinite;
}

body.motion-ready .tech-panel > header {
    animation: rise-in 650ms var(--motion-ease-out) 80ms both;
}

body.motion-ready .tech-panel > section {
    animation: rise-in 680ms var(--motion-ease-out) 150ms both;
}

body.motion-ready .tech-panel > main {
    animation: rise-in 720ms var(--motion-ease-out) 220ms both;
}

.motion-logo-mark {
    animation: logo-float 4.5s ease-in-out 900ms infinite;
    transform-origin: center;
}

.motion-status {
    transition: border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}

.motion-status:hover {
    border-color: rgba(0, 240, 255, 0.7);
    box-shadow: 0 0 18px rgba(0, 240, 255, 0.12);
}

#emailAddress,
.private-link-input,
.expiry-option {
    transition: border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease, background-color var(--motion-fast) ease;
}

#emailAddress:focus,
.private-link-input:focus,
.expiry-option:focus-visible {
    background-color: rgba(0, 240, 255, 0.035);
    border-color: rgba(0, 240, 255, 0.9);
    box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.11), 0 0 22px rgba(0, 240, 255, 0.08);
}

#emailAddress.value-updated,
.private-link-input.link-updated {
    animation: input-highlight 700ms var(--motion-ease-out);
}

#generateBtn.is-generating {
    animation: button-pop 520ms var(--motion-ease-out);
}

#generateBtn.is-generating svg {
    animation: button-spin 560ms var(--motion-ease-out);
}

[data-action="sync"][aria-busy="true"] {
    cursor: progress;
}

[data-action="sync"][aria-busy="true"]::before {
    position: absolute;
    top: 50%;
    left: 0.75rem;
    width: 0.8rem;
    height: 0.8rem;
    content: '';
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: button-spin 700ms linear infinite;
    transform: translateY(-50%);
}

.email-list-item {
    transform-origin: left center;
    transition: background-color var(--motion-fast) ease, border-color var(--motion-fast) ease, transform var(--motion-fast) var(--motion-ease-out), box-shadow var(--motion-fast) ease;
}

.email-list-item:hover,
.email-list-item:focus-within {
    transform: translateX(4px);
    box-shadow: inset 3px 0 rgba(0, 240, 255, 0.2);
}

.email-list-item.motion-list-item-new {
    animation: list-item-in 480ms var(--motion-ease-out) both;
    animation-delay: var(--motion-delay, 0ms);
}

#activeEmailView.viewer-enter {
    animation: viewer-in 520ms var(--motion-ease-out) both;
}

#activeEmailView.viewer-enter #viewSubject,
#activeEmailView.viewer-enter #viewBody,
#activeEmailView.viewer-enter #senderAvatar,
#activeEmailView.viewer-enter #viewDate {
    animation: viewer-content-in 520ms var(--motion-ease-out) both;
}

#activeEmailView.viewer-enter #viewBody { animation-delay: 90ms; }
#activeEmailView.viewer-enter #senderAvatar { animation-delay: 50ms; }
#activeEmailView.viewer-enter #viewDate { animation-delay: 130ms; }

.private-link {
    position: relative;
    overflow: hidden;
}

.private-link::after {
    position: absolute;
    top: 0;
    bottom: 0;
    left: -28%;
    width: 18%;
    pointer-events: none;
    content: '';
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
    transform: skewX(-18deg);
    animation: border-sweep 8s var(--motion-ease-in-out) infinite;
}

@keyframes expiry-change {
    0% { transform: translateY(0); box-shadow: 0 0 0 rgba(0, 240, 255, 0); }
    35% { transform: translateY(-2px); box-shadow: 0 0 0 4px rgba(0, 240, 255, 0.12), 0 0 24px rgba(0, 240, 255, 0.18); }
    100% { transform: translateY(0); box-shadow: 0 0 0 rgba(0, 240, 255, 0); }
}

@keyframes expiry-status-in {
    0% { opacity: 0.35; transform: translateY(4px) scale(0.96); }
    70% { opacity: 1; transform: translateY(0) scale(1.02); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

body.motion-ready .expiry-controls.duration-changed .expiry-option.is-selected,
body.motion-ready .expiry-controls.duration-changed .expiry-current {
    animation: expiry-change 620ms var(--motion-ease-out) both;
}

body.motion-ready .expiry-current.status-pop {
    animation: expiry-status-in 480ms var(--motion-ease-out) both;
}

.private-link-button.feedback-pop,
#copyBtn.feedback-pop {
    animation: feedback-pop 420ms var(--motion-ease-out);
}

/* Keep focus visible and motion optional for keyboard and touch users. */
*:focus-visible {
    outline: 2px solid #00f0ff;
    outline-offset: 3px;
}

@media (max-width: 640px) {
    body.motion-ready .tech-panel::after { width: 60%; }
    body.motion-ready .tech-panel > header,
    body.motion-ready .tech-panel > section,
    body.motion-ready .tech-panel > main { animation-duration: 520ms; }
    .email-list-item:hover,
    .email-list-item:focus-within { transform: translateX(2px); }
}

@keyframes status-message-pop {
    0% { opacity: 0.35; transform: translateY(3px); }
    70% { opacity: 1; transform: translateY(0); }
    100% { opacity: 1; transform: translateY(0); }
}

#syncStatus.status-pop {
    animation: status-message-pop 520ms var(--motion-ease-out) both;
}

@keyframes empty-float {
    0%, 100% { transform: translateY(0); filter: drop-shadow(0 0 0 rgba(0, 240, 255, 0)); }
    50% { transform: translateY(-7px); filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.22)); }
}

@keyframes nav-glint {
    0%, 70% { transform: translateX(-120%); opacity: 0; }
    78% { opacity: 0.7; }
    100% { transform: translateX(120%); opacity: 0; }
}

@keyframes scan-drift {
    0% { background-position: 0 0, 0 0; }
    100% { background-position: 0 160px, 120px 0; }
}

/* Additional ambient and state motion. All transforms are driven by CSS variables
   so pointer effects can be throttled in JavaScript without layout work. */
body.motion-ready .tech-panel {
    --pointer-x: 50%;
    --pointer-y: 24%;
    /* Keep the panel stable after its one-time entrance. */
}

body.motion-ready .tech-panel::before {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    content: '';
    background:
        radial-gradient(circle at var(--pointer-x) var(--pointer-y), rgba(0, 240, 255, 0.1), transparent 22rem),
        repeating-linear-gradient(180deg, transparent 0 5px, rgba(0, 240, 255, 0.018) 6px 7px);
    opacity: 0.65;
    animation: scan-drift 18s linear infinite;
    transition: background-position 260ms var(--motion-ease-out), opacity var(--motion-fast) ease;
}

body.motion-ready .tech-panel > header,
body.motion-ready .tech-panel > section,
body.motion-ready .tech-panel > main {
    position: relative;
    z-index: 1;
}

body.motion-ready .status-online {
    position: relative;
    animation: none;
}

body.motion-ready #noEmailSelected svg {
    animation: empty-float 4.8s ease-in-out 1.1s infinite;
}

body.motion-ready #inboxCountdown {
    min-width: 9.8rem;
}

body.motion-ready .feature-card,
body.motion-ready .feature-list-item,
body.motion-ready .blog-card,
body.motion-ready .contact-form,
body.motion-ready .danger-box,
body.motion-ready .code-block,
body.motion-ready .feature-check,
body.motion-ready .feature-cross,
body.motion-ready .step-item,
body.motion-ready .privacy-section,
body.motion-ready .endpoint-card,
body.motion-ready .quick-link-card,
body.motion-ready .checklist-item,
body.motion-ready .comparison-table {
    transform: perspective(900px) rotateX(var(--tilt-y, 0deg)) rotateY(var(--tilt-x, 0deg));
    transform-style: preserve-3d;
    transition: transform 260ms var(--motion-ease-out), border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}

body.motion-ready .feature-card:hover,
body.motion-ready .feature-list-item:hover,
body.motion-ready .blog-card:hover,
body.motion-ready .contact-form:hover,
body.motion-ready .danger-box:hover,
body.motion-ready .code-block:hover,
body.motion-ready .feature-check:hover,
body.motion-ready .feature-cross:hover,
body.motion-ready .step-item:hover,
body.motion-ready .privacy-section:hover,
body.motion-ready .endpoint-card:hover,
body.motion-ready .quick-link-card:hover,
body.motion-ready .checklist-item:hover,
body.motion-ready .comparison-table:hover {
    transform: perspective(900px) rotateX(var(--tilt-y, 0deg)) rotateY(var(--tilt-x, 0deg)) translateY(-4px);
}

body.motion-ready .tech-panel button,
body.motion-ready .tech-panel a,
body.motion-ready nav a {
    overflow: hidden;
}

body.motion-ready .tech-panel button::before,
body.motion-ready nav a::before {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 34%;
    pointer-events: none;
    content: '';
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
    transform: translateX(-120%);
}

body.motion-ready .tech-panel button:hover::before,
body.motion-ready .tech-panel button:focus-visible::before,
body.motion-ready nav a:hover::before,
body.motion-ready nav a:focus-visible::before {
    animation: nav-glint 700ms var(--motion-ease-out) both;
}

@media (pointer: coarse) {
    body.motion-ready .feature-card,
    body.motion-ready .feature-list-item,
    body.motion-ready .blog-card,
    body.motion-ready .contact-form,
    body.motion-ready .danger-box,
    body.motion-ready .code-block,
    body.motion-ready .feature-check,
    body.motion-ready .feature-cross,
    body.motion-ready .step-item,
    body.motion-ready .privacy-section,
    body.motion-ready .endpoint-card,
    body.motion-ready .quick-link-card,
    body.motion-ready .checklist-item,
    body.motion-ready .comparison-table {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    body.motion-ready,
    body.motion-ready::before,
    body.motion-ready .tech-panel,
    body.motion-ready .tech-panel::after,
    body.motion-ready .tech-panel::before,
    body.motion-ready .status-online,
    body.motion-ready #noEmailSelected svg,
    #syncStatus.status-pop,
    body.motion-ready .tech-panel > header,
    body.motion-ready .tech-panel > section,
    body.motion-ready .tech-panel > main,
    body.motion-ready > nav,
    body.motion-ready > header,
    body.motion-ready > footer,
    .motion-logo-mark,
    .countdown.warning,
    .expiry-controls.duration-changed .expiry-option.is-selected,
    .expiry-controls.duration-changed .expiry-current,
    .expiry-current.status-pop,
    [data-action="sync"][aria-busy="true"]::before,
    .button-ripple {
        animation: none !important;
    }

    body.motion-ready [data-reveal],
    body.motion-ready [data-reveal].is-visible {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }

    .feature-card:hover,
    .feature-list-item:hover,
    .blog-card:hover,
    .contact-form:hover,
    .danger-box:hover,
    .code-block:hover,
    .feature-check:hover,
    .feature-cross:hover,
    .step-item:hover,
    .privacy-section:hover,
    .endpoint-card:hover,
    .quick-link-card:hover,
    .checklist-item:hover,
    .comparison-table:hover,
    .email-list-item:hover,
    .email-list-item:focus-within,
    .btn-tactical:active,
    .btn-primary:active,
    button:active {
        transform: none;
    }
}