/* =====================================================
   MODERN FLIP CLOCK – FLIP ANIMATION CSS
   ===================================================== */

/* --------- FLIP UNIT --------- */
.flip-unit {
    position: relative;
    width: var(--digit-width);
    height: var(--digit-size);
    border-radius: var(--digit-radius);
    perspective: 600px;
    cursor: default;
    user-select: none;
}

/* Static Top / Bottom halves - each is 50% tall with overflow:hidden */
.flip-card {
    position: absolute;
    left: 0;
    right: 0;
    height: 50%;
    overflow: hidden;
    background: var(--flip-bg);
    font-family: var(--font-clock);
    color: var(--flip-text);
    line-height: 1;
    border: 1px solid var(--flip-border);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    backface-visibility: hidden;
}

/* Upper half */
.flip-card.upper {
    top: 0;
    border-radius: var(--digit-radius) var(--digit-radius) 0 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.5);
    background: linear-gradient(180deg, var(--flip-bg) 0%, var(--flip-bg-alt) 100%);
}

/* Lower half */
.flip-card.lower {
    bottom: 0;
    border-radius: 0 0 var(--digit-radius) var(--digit-radius);
    background: linear-gradient(180deg, var(--flip-bg-alt) 0%, var(--flip-bg) 100%);
}

/* Span handles full digit height, so clipping matches exactly */
.flip-card span {
    position: absolute;
    left: 0;
    right: 0;
    height: var(--digit-size);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--digit-size);
    font-weight: 900;
}

.flip-card.upper span {
    top: 0;
}

.flip-card.lower span {
    bottom: 0;
}

/* Center line (fold) */
.flip-unit::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    margin-top: -1px;
    background: rgba(0, 0, 0, 0.55);
    z-index: 5;
    pointer-events: none;
}

/* Glossy highlight on upper card */
.flip-card.upper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.10) 0%, transparent 100%);
    pointer-events: none;
    border-radius: inherit;
}

/* --------- ANIMATED FLIP CARDS --------- */
.flip-card.flip-front,
.flip-card.flip-back {
    position: absolute;
    left: 0;
    right: 0;
    width: 100%;
    height: 50%;
    z-index: 10;
    transform-style: preserve-3d;
    backface-visibility: hidden;
}

.flip-card.flip-front {
    top: 0;
    transform-origin: bottom center;
}

.flip-card.flip-back {
    bottom: 0;
    transform: rotateX(180deg);
    transform-origin: top center;
}

/* Active flip animation */
.flip-unit.is-flipping .flip-card.flip-front {
    animation: flipFrontDown var(--flip-speed) var(--flip-mode) forwards;
    z-index: 20;
}

.flip-unit.is-flipping .flip-card.flip-back {
    animation: flipBackUp var(--flip-speed) var(--flip-mode) forwards;
    z-index: 20;
}

@keyframes flipFrontDown {
    0% {
        transform: rotateX(0deg);
    }

    100% {
        transform: rotateX(-180deg);
    }
}

@keyframes flipBackUp {
    0% {
        transform: rotateX(180deg);
    }

    100% {
        transform: rotateX(0deg);
    }
}

/* Mechanical flip */
.flip-unit.flip-mechanical.is-flipping .flip-card.flip-front {
    animation-timing-function: cubic-bezier(0.4, 0, 0.6, 1);
}

.flip-unit.flip-mechanical.is-flipping .flip-card.flip-back {
    animation-timing-function: cubic-bezier(0.4, 0, 0.6, 1);
}

/* --------- SEPARATOR --------- */
.flip-separator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: clamp(6px, 1.8vw, 14px);
    padding: 0 clamp(2px, 0.5vw, 6px);
    height: var(--digit-size);
}

.flip-separator .dot {
    width: clamp(6px, 1.4vw, 12px);
    height: clamp(6px, 1.4vw, 12px);
    border-radius: 50%;
    background: var(--flip-separator-color);
    box-shadow: 0 0 10px var(--flip-separator-color), 0 0 20px var(--flip-glow-color);
    animation: dotPulse 1s ease infinite;
    display: block;
}

.flip-separator .dot:nth-child(2) {
    animation-delay: 0.3s;
}

@keyframes dotPulse {

    0%,
    100% {
        opacity: 0.7;
        transform: scale(1);
    }

    50% {
        opacity: 1;
        transform: scale(1.25);
    }
}

.flip-separator.blink .dot {
    animation: dotBlink 1s step-end infinite;
}

@keyframes dotBlink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.15;
    }
}

/* Hide seconds when toggled off */
body.no-seconds #secondsGroup,
body.no-seconds #sep2 {
    display: none;
}

/* --------- SHADOW DEPTH --------- */
.flip-unit {
    box-shadow: 0 6px 20px var(--flip-shadow), 0 1px 0 rgba(255, 255, 255, 0.04);
}

body.shadow-deep .flip-unit {
    box-shadow: 0 10px 40px var(--flip-shadow), 0 2px 0 rgba(255, 255, 255, 0.06);
}

body.shadow-none .flip-unit {
    box-shadow: none;
}

/* --------- NIGHT GLOW --------- */
body.night-glow .flip-card span {
    text-shadow: 0 0 14px var(--flip-glow-color), 0 0 4px rgba(255, 255, 255, 0.4);
}

body.night-glow .flip-separator .dot {
    box-shadow:
        0 0 8px var(--flip-separator-color),
        0 0 16px var(--flip-separator-color),
        0 0 30px var(--flip-glow-color);
}

/* --------- NEON MODE --------- */
body.mode-neon .flip-card {
    background: #000 !important;
}

body.mode-neon .flip-card span {
    color: var(--clr-accent-neon) !important;
    text-shadow: 0 0 10px var(--clr-accent-neon), 0 0 20px var(--clr-accent-neon), 0 0 40px var(--clr-accent-neon) !important;
}

body.mode-neon .flip-card {
    border-color: rgba(0, 255, 245, 0.2) !important;
}

body.mode-neon .flip-separator .dot {
    background: var(--clr-accent-neon) !important;
    box-shadow: 0 0 12px var(--clr-accent-neon), 0 0 25px var(--clr-accent-neon) !important;
}

/* --------- RETRO (brown/orange) --------- */
body.mode-retro .flip-card {
    background: linear-gradient(180deg, #2a1a0a 0%, #1a0f05 100%) !important;
    border-color: rgba(255, 153, 51, 0.15) !important;
    font-family: 'Courier New', monospace !important;
}

body.mode-retro .flip-card span {
    color: #ff9933 !important;
    text-shadow: 0 0 6px rgba(255, 153, 51, 0.5) !important;
}

/* --------- MINIMAL MODE --------- */
body.mode-minimal .flip-unit {
    box-shadow: none !important;
    border-radius: 2px !important;
}

body.mode-minimal .flip-card {
    background: transparent !important;
    border-color: transparent !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
}

body.mode-minimal .flip-card.upper {
    border-radius: 0 !important;
}

body.mode-minimal .flip-card.lower {
    border-radius: 0 !important;
}

body.mode-minimal .flip-unit::after {
    display: none;
}

/* --------- TRANSPARENT MODE --------- */
body.mode-transparent .flip-card {
    background: rgba(0, 0, 0, 0.25) !important;
    border: 1px solid rgba(255, 255, 255, 0.12) !important;
    backdrop-filter: blur(10px) !important;
}

/* --------- GLASS MODE --------- */
body.mode-glass .flip-card {
    background: rgba(255, 255, 255, 0.08) !important;
    border: 1px solid rgba(255, 255, 255, 0.18) !important;
    backdrop-filter: blur(16px) saturate(1.8) !important;
}

/* --------- ROUNDED / SQUARE --------- */
body.flip-square .flip-unit {
    border-radius: 0 !important;
}

body.flip-square .flip-card {
    border-radius: 0 !important;
}

body.flip-rounded .flip-unit {
    border-radius: 1.2rem !important;
}

body.flip-rounded .flip-card.upper {
    border-radius: 1.2rem 1.2rem 0 0 !important;
}

body.flip-rounded .flip-card.lower {
    border-radius: 0 0 1.2rem 1.2rem !important;
}

/* --------- MATRIX MODE --------- */
body.mode-matrix .flip-card {
    background: #000 !important;
    border-color: rgba(0, 255, 65, 0.2) !important;
    font-family: var(--font-mono) !important;
}

body.mode-matrix .flip-card span {
    color: #00ff41 !important;
    text-shadow: 0 0 5px #00ff41, 0 0 10px #00ff41 !important;
}

/* --------- SPLIT FLAP MODE --------- */
body.mode-splitflap .flip-unit {
    border-radius: 0 !important;
    border: 2px solid #333 !important;
}

body.mode-splitflap .flip-card {
    background: #f5f5f0 !important;
    border-color: #ccc !important;
    font-family: 'Courier New', monospace !important;
}

body.mode-splitflap .flip-card span {
    color: #111 !important;
    font-weight: 900 !important;
    text-shadow: none !important;
}

body.mode-splitflap .flip-separator .dot {
    background: #333 !important;
    box-shadow: none !important;
}

/* --------- CARD STYLE --------- */
body.mode-card .flip-unit {
    background: var(--clr-bg-card) !important;
    border: 1px solid var(--clr-border) !important;
    border-radius: 0.75rem !important;
    padding: 0.25rem !important;
}

/* --------- HIDE FLIP CLOCK FOR OVERLAYS --------- */
body.mode-binary .flip-unit-group,
body.mode-binary .flip-separator,
body.mode-roman .flip-unit-group,
body.mode-roman .flip-separator {
    opacity: 0 !important;
    pointer-events: none !important;
}

/* --------- FONT STYLE OVERRIDES --------- */
.flip-font-orbitron .flip-card {
    font-family: 'Orbitron', monospace !important;
}

.flip-font-mono .flip-card {
    font-family: 'Roboto Mono', monospace !important;
}

.flip-font-rajdhani .flip-card {
    font-family: 'Rajdhani', sans-serif !important;
}

.flip-font-sharetech .flip-card {
    font-family: 'Share Tech Mono', monospace !important;
}