/* ---------- Layout ---------- */

body {
    background: var(--bg-main);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ---------- Nav ---------- */

nav {
    background: var(--gradient-header);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 2rem;

    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav h4 {
    font-weight: 500;
    letter-spacing: 0.5px;
}

nav button {
    background: transparent;
    border: 1px solid var(--border-subtle);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
}

nav button a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

nav button:hover {
    border-color: var(--accent-primary);
}

nav button:hover a {
    color: var(--text-primary);
}

/* ---------- Main ---------- */

#main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---------- Card ---------- */

#container {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 3rem 3.5rem;
    min-width: 340px;

    text-align: center;

    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.35),
        inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

/* ---------- Session ---------- */

#session {
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 1.2rem;
    text-transform: uppercase;
    font-size: 0.85rem;
}

/* ---------- Timer ---------- */

#timer {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 2rem;

    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ---------- Buttons ---------- */

#btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

#btns button {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    padding: 0.6rem 1.4rem;
    border-radius: 8px;

    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

#btns button:active {
    scale: 0.95;
}

/* Start */
#start {
    border-color: var(--accent-primary);
}

#start:hover {
    background: var(--accent-primary);
    color: #fff;
}

/* Pause */
#pause:hover {
    border-color: var(--accent-warning);
    color: var(--accent-warning);
}

/* Reset */
#reset:hover {
    border-color: var(--accent-error);
    color: var(--accent-error);
}

/* ---------- Responsive ---------- */

@media (max-width: 480px) {
    #container {
        padding: 2rem;
        min-width: auto;
        width: 90%;
    }

    #timer {
        font-size: 3rem;
    }
}