:root, html.dark-theme {
    --pundora-steel: #78AF9F;
    --pundora-blue: #659CC8;
    --pundora-ice: #DEECE8;

    --bg-gradient: radial-gradient(ellipse at bottom, #1D1D1D 0%, #090A0F 100%);
    --text-color: #FFFFFF;
    --placeholder-color: #777777;
    --border-hover: #2A2A2A;
    --border-focus: #FFFFFF;
    --glow-running: rgba(255, 255, 255, 0.35);
    --glow-paused: rgba(255, 59, 48, 0.35);

    --instr-color-1: var(--pundora-steel);
    --instr-color-2: var(--pundora-ice);
}

@media (prefers-color-scheme: light) {
    :root:not(.dark-theme) {
        --bg-gradient: radial-gradient(ellipse at top, #F7F9FA 0%, #E8ECEF 100%);
        --text-color: #1A1A1A;
        --placeholder-color: #9A9A9A;
        --border-hover: #CCCCCC;
        --border-focus: #1A1A1A;
        --glow-running: rgba(0, 0, 0, 0.65);
        --glow-paused: rgba(235, 60, 50, 0.55);

        --instr-color-1: #4D7E70;
        --instr-color-2: #3B6B92;
    }
}

html.light-theme {
    --bg-gradient: radial-gradient(ellipse at top, #F7F9FA 0%, #E8ECEF 100%);
    --text-color: #1A1A1A;
    --placeholder-color: #9A9A9A;
    --border-hover: #CCCCCC;
    --border-focus: #1A1A1A;
    --glow-running: rgba(0, 0, 0, 0.65);
    --glow-paused: rgba(235, 60, 50, 0.55);

    --instr-color-1: #4D7E70;
    --instr-color-2: #3B6B92;
}

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

html, body {
    width: 100vw;
    width: 100dvw;
    height: 100vh;
    height: 100dvh;
    margin: 0;
    padding: 0;
    font-family: "Space Grotesk", sans-serif;
    overflow: hidden;
    background: var(--bg-gradient);
    transition: background 0.3s ease;
}

body::before, body::after {
    content: '';
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 24px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
    z-index: 2;
}

body::after {
    background: linear-gradient(to top, var(--glow-running) 0%, transparent 100%);
}

body::before {
    background: linear-gradient(to top, var(--glow-paused) 0%, transparent 100%);
}

body.timer-running::after { opacity: 1; }
body.timer-running::before { opacity: 0; }
body.timer-paused::before { opacity: 1; }
body.timer-paused::after { opacity: 0; }

#pulseOverlay {
    position: fixed;
    inset: 0;
    width: 100vw;
    width: 100dvw;
    height: 100vh;
    height: 100dvh;
    pointer-events: none;
    opacity: 0;
    z-index: 1;
    background: radial-gradient(ellipse 120% 100% at 50% 100%, var(--glow-running) 0%, transparent 100%);
    transition: opacity 0.4s ease-in-out;
}

body.timer-finished #pulseOverlay {
    animation: finished-bg-pulse 1.6s ease-in-out infinite alternate;
}

.wrapper {
    position: fixed;
    inset: 0;
    width: 100vw;
    width: 100dvw;
    height: 100vh;
    height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 5;
}

.timer-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    padding: 1.5rem;
    text-align: center;
    position: relative;
}

#timerInput {
    font-family: inherit;
    font-size: clamp(2.75rem, 13vw, 10rem);
    line-height: 1.1;
    color: var(--text-color);
    padding: 0.2rem 0.5rem;
    cursor: text;
    outline: none;
    user-select: none;
    -webkit-user-select: none;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

#timerInput:hover {
    border-bottom-color: var(--border-hover);
}

#timerInput:focus {
    border-bottom-color: var(--border-focus);
}

#timerInput.locked {
    cursor: default;
    pointer-events: none;
    border-bottom-color: transparent !important;
}

.digit-untyped {
    color: var(--placeholder-color);
}

.digit-typed {
    color: var(--text-color);
}

.instructions {
    position: absolute;
    bottom: 50px;
    font-weight: 500;
    font-size: clamp(0.85rem, 2.5vw, 1.15rem);
    letter-spacing: 0.02em;
    max-width: 90vw;
    line-height: 1.4;
    animation: instruction-color-glow 2s linear infinite forwards;
    margin: 0;
    text-align: center;
}

#themeToggle, #lockToggle, #muteToggle {
    position: fixed;
    top: 24px;
    width: 50px;
    height: 50px;
    background: transparent;
    border: none;
    cursor: pointer;
    line-height: 50px;
    font-size: 1.5em;
    text-align: center;
    color: var(--placeholder-color);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    outline: none;
    user-select: none;
    z-index: 100;
    transition: color 0.2s ease, transform 0.2s ease, opacity 0.3s ease, background-color 0.2s ease;
}

#themeToggle {
    left: 24px;
}

#muteToggle {
    position: relative;
    left: 98px;
}

#muteToggle.is-muted::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1.05em;
    height: 2px;
    background-color: #FF9B9B;
    transform: translate(-50%, -50%) rotate(45deg);
    border-radius: 1px;
    pointer-events: none;
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.4);
}

#lockToggle {
    right: 24px;
    opacity: 0;
    pointer-events: none;
    font-family: inherit;
    font-variant-emoji: text;
}

#themeToggle:hover, #lockToggle:hover, #muteToggle:hover {
    color: var(--text-color);
    background-color: rgba(128, 128, 128, 0.15);
    transform: scale(1.08);
}

#themeToggle:active, #lockToggle:active, #muteToggle:active {
    transform: scale(0.95);
}

#lockToggle.visible {
    opacity: 1;
    pointer-events: auto;
}

#lockToggle.locked {
    color: var(--text-color);
}

@keyframes instruction-color-glow {
    0% { color: var(--instr-color-1); }
    50% { color: var(--instr-color-2); }
    100% { color: var(--instr-color-1); }
}

@keyframes finished-bg-pulse {
    0% { opacity: 0.15; }
    100% { opacity: 0.85; }
}

::-webkit-scrollbar {
    display: none;
}