/* =========================================
   VISIBILITY UTILITIES
   ========================================= */

/* CRITICAL FIX: Exclude Modals and Toasts from being instantly 'nuked'.
   By default, .hidden sets display:none. We must prevent this for elements
   that need to animate their exit (slide/fade out).
*/
.hidden:not(.modal-backdrop):not(.toast) { 
    display: none !important; 
}

/* =========================================
   KEYFRAME ANIMATIONS (Keep existing)
   ========================================= */

@keyframes fadeIn { 
    from { opacity: 0; transform: translateY(10px); } 
    to { opacity: 1; transform: translateY(0); } 
}
.lap-row { animation: fadeIn 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }

.icon-play, .icon-pause { transition: opacity 0.2s ease, transform 0.2s ease; }

@keyframes popIn { 
    0% { opacity: 0; transform: scale(0.8); } 
    100% { opacity: 1; transform: scale(1); } 
}
.btn-circle:not(.hidden) { animation: popIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1); }

/* =========================================
   v8.2 BREATHING UI (The Heartbeat)
   ========================================= */

@keyframes breathe {
    0% { opacity: 1; }
    50% { opacity: 0.5; } /* Fades out to 50% brightness */
    100% { opacity: 1; }
}

/* Optional: A very subtle glow pulse for the digits */
@keyframes pulseGlow {
    0% { text-shadow: 0 0 0 rgba(255,255,255,0); }
    50% { text-shadow: 0 0 15px rgba(255,255,255,0.15); }
    100% { text-shadow: 0 0 0 rgba(255,255,255,0); }
}


/* =========================================
   v8.5 SMOOTH NUMBER TRANSITIONS
   ========================================= */

/* =========================================
   v8.6 KINETIC PHYSICS ENGINE (Gravity + Blur)
   ========================================= */

/* 1. FALLING (For Timer - Countdown) */
/* Starts high, slightly blurred, and falls into place with weight */
@keyframes gravity-fall {
    0% {
        opacity: 0;
        transform: translateY(-35px) scale(0.9); /* Starts higher */
        filter: blur(4px); /* Motion Blur */
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0px); /* Sharpens on impact */
    }
}

/* 2. RISING (For Stopwatch - Count Up) */
/* Starts low, slightly blurred, and floats up */
@keyframes anti-gravity-rise {
    0% {
        opacity: 0;
        transform: translateY(35px) scale(0.9); /* Starts lower */
        filter: blur(4px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0px);
    }
}

/* --- THE TRIGGER CLASSES (Managed by JS) --- */

.tick-fall {
    display: inline-block;
    will-change: transform, opacity, filter;
    /* The "Apple Spring" Curve: Fast start, soft, slightly bouncy landing */
    animation: gravity-fall 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.tick-rise {
    display: inline-block;
    will-change: transform, opacity, filter;
    animation: anti-gravity-rise 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* =========================================
   NEW SESSION COMPLETE ANIMATION (v9.0)
   ========================================= */
@keyframes pulse-green {
    0% { filter: drop-shadow(0 0 0px var(--accent-color)); }
    50% { filter: drop-shadow(0 0 20px var(--accent-color)); }
    100% { filter: drop-shadow(0 0 0px var(--accent-color)); }
}
.session-complete-pulse {
    /* Reuse the existing 'pulse-green' keyframes */
    /* 1.5s duration | ease-in-out timing | 1 iteration (Run ONCE) */
    animation: pulse-green 1.5s ease-in-out 1; 
    
    /* Ensure the ring is visible during the animation */
    stroke: var(--accent-color) !important;
    opacity: 1 !important;
    filter: grayscale(0%);
    -webkit-filter: grayscale(0%);
}
body.is-deep-focus .controls-section .progress-container .progress-ring.session-complete-pulse {
    filter: none !important; /* Let the animation colors shine through */
    filter: grayscale(none) !important;
}

/* The Text Glow */
body.timer-complete #clockGroup {
    color: #FFFFFF;
    text-shadow: 0 0 25px rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}


/* =========================================
   SPATIAL SLIDE TAB ANIMATION
   ========================================= */
@keyframes slide-from-left {
    0% { opacity: 0; transform: translateX(-60px); }
    100% { opacity: 1; transform: translateX(0); }
}

@keyframes slide-from-right {
    0% { opacity: 0; transform: translateX(60px); }
    100% { opacity: 1; transform: translateX(0); }
}

.slide-from-left {
    animation: slide-from-left 0.35s cubic-bezier(0.19, 1, 0.22, 1);
}

.slide-from-right {
    animation: slide-from-right 0.35s cubic-bezier(0.19, 1, 0.22, 1);
}