/* --- Resets --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    height: 100vh;
    width: 100vw;
    overflow: hidden; 
    
    display: grid;
    grid-template-rows: auto 1fr;
    transition: background-color var(--transition-slow);
}

/* --- Typography --- */
.time-display {
    font-family: var(--font-time);
    font-size: var(--time-size);
    font-weight: var(--weight-time);
    text-align: center;
    line-height: 1;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums; 
}

/* --- Layout Zones --- */
.app-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
}

nav {
    display: flex;
    gap: var(--spacing-md);
}

#app-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100%;
    height: 100%;
    gap: var(--spacing-lg); 
}

.app-controls {
    display: flex;
    flex-direction: column; 
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
}

/* --- UI Controls & Buttons --- */
button {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: var(--ui-size);
    cursor: pointer;
    transition: color var(--transition-fast);
}

button:hover, .nav-btn.active {
    color: var(--text-primary);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn {
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 500;
    padding: 0.8rem 2.5rem;
    border-radius: 50px;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    background-color: transparent;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.control-btn:hover:not(:disabled) {
    background-color: var(--text-primary);
    color: var(--bg-color);
    border-color: var(--text-primary);
}

.control-btn.primary {
    background-color: var(--text-primary);
    color: var(--bg-color);
    border-color: var(--text-primary);
}

.control-btn.primary:hover:not(:disabled) {
    background-color: transparent;
    color: var(--text-primary);
}

.control-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.preset-btn {
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: none;
    background-color: rgba(128, 128, 128, 0.15);
    color: var(--text-secondary);
}

.preset-btn:hover:not(:disabled) {
    background-color: rgba(128, 128, 128, 0.3);
    color: var(--text-primary);
}

/* NEW: Clean inline time inputs for the custom timer form */
.time-input {
    width: 3rem;
    background: transparent;
    color: var(--text-primary);
    border: none;
    border-bottom: 2px solid var(--text-secondary);
    font-family: var(--font-time);
    font-size: 1rem;
    text-align: center;
    padding: 0.2rem;
    outline: none;
    transition: border-color var(--transition-fast);
    -moz-appearance: textfield; /* Hides default arrows in Firefox */
}

/* Hides default arrows in Chrome/Safari */
.time-input::-webkit-outer-spin-button,
.time-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.time-input:focus {
    border-bottom-color: var(--text-primary);
}

.time-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.3;
}

/* --- Idle Fading Logic --- */
.ui-element {
    transition: opacity var(--transition-slow);
    opacity: 1;
}

body.idle .ui-element {
    opacity: 0;
    pointer-events: none; 
}

/* --- Overlays --- */
.hidden {
    display: none !important;
}